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Liu, Jinguo, Xin Zhang, Ketao Zhang, Jian S. Dai, Shujun Li und Qi Sun. „Configuration analysis of a reconfigurable Rubik's snake robot“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, Nr. 9 (06.10.2018): 3137–54. http://dx.doi.org/10.1177/0954406218805112.
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Versatility and adaptability are the most prominent advantages of reconfigurable modular robotic systems. Unlike integrated robotic systems, reconfigurable modular robots can be rearranged to adapt to unpredictable environments. This paper presents a novel reconfigurable modular robot inspired by the Rubik's snake toy. For this reconfigurable Rubik's snake robot, the special feature is that it can work as not only a mechanism but also as a reconfigurable structure. In this paper, the configuration analysis is the core content. The concept of valid configurations is proposed to describe valid, controllable, and non-interference configurations. The configuration analysis theories are introduced in accordance with the configuration representation, the isomorphism analysis, the interference analysis, and the motion sequence analysis. Here, the configuration representation is proposed to define the position and orientation of two modules by using the adjacency matrix and the binary digital code, respectively. The equivalent digital code and the configuration ring are used to distinguish the same or symmetric configurations for the open and closed isomorphism configurations, respectively. Meanwhile, a case study is conducted to verify the effectiveness of the isomorphism analysis. Furthermore, the working space interference method is introduced to detect the interference issue in the process of forming target configurations. To accomplish a target configuration properly, the motion sequence matrix is defined to describe the motion sequence for achieving a target configuration. Finally, an experiment on the configuration transformation is demonstrated to verify the rationality and correctness of the theories of configuration analysis.
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Firoozi, Zahra, N. Ismail, Shahram Ariafar, S. H. Tang, M. K. A. M. Ariffin und Azizollah Memariani. „Cost Analysis of Two Different Configurations for a Distribution Network Design“. Applied Mechanics and Materials 564 (Juni 2014): 656–60. http://dx.doi.org/10.4028/www.scientific.net/amm.564.656.
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One significant decision in supply chain management is to determine the configuration of the supply chain network. However, studies that analyze different configurations are rare in the literature. This paper considers a supply chain network consisting of one supplier and a number of retailers. Two different configurations were proposed and were compared in terms of total cost for the network. In the first configuration, retailers directly order to the supplier and hold the inventory to meet the demand of customers. However, in the second configuration, a number of intermediate facilities were established to order products from the supplier and satisfy the demands of retailers. The inventory of retailers in the latter configuration is stored in the intermediate facilities. These two configurations were compared in terms of total cost. Numerical calculations indicate that the latter configuration was preferred in most cases.
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van Dommelen, Jorrit, und Roelof Vos. „Conceptual design and analysis of blended-wing-body aircraft“. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 228, Nr. 13 (29.01.2014): 2452–74. http://dx.doi.org/10.1177/0954410013518696.
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Due to the unconventional nature of the blended wing body (BWB) no off-the-shelf software package exists for its conceptual design. This study details a first step towards the implementation of traditional and BWB-specific design and analysis methods into a software tool to enable preliminary sizing of a BWB. The tool is able to generate and analyze different BWB configurations on a conceptual level. This paper investigates three different BWB configurations. The first configuration is an aft-swept BWB with aft-mounted engines, the second configuration is an aft-swept BWB with wing-mounted engines and the third configuration is a forward-swept BWB with wing-mounted engines. These aircraft comply with the same set of top-level requirements and airworthiness requirements. Each of the designs has been optimized for maximum harmonic range, while keeping its maximum take-off weight constant and identical. Results show that the forward-swept configuration with wing-mounted engines has the highest harmonic range. These findings warrant further investigation in this configuration and other alternative BWB configurations.
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Pothong, Witit, Phichayut Phinyo, Yuddhasert Sirirungruangsarn, Kriengkrai Nabudda, Nattamon Wongba, Chatchawarl Sarntipiphat und Dumnoensun Pruksakorn. „Biomechanical Analysis of Sagittal Plane Pin Placement Configurations for Pediatric Supracondylar Humerus Fractures“. Applied Sciences 11, Nr. 8 (12.04.2021): 3447. http://dx.doi.org/10.3390/app11083447.
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Anterior to posterior (AP) pinning is the recommended sagittal pin configuration in divergent lateral entry coronal pinning of pediatrics supracondylar fractures. However, there was still a lack of evidence regarding alternative sagittal pins configurations. We aimed to compare the construct stiffness of alternative sagittal pin configurations by using synthetic bone models. Sixty synthetic pediatric humeri were osteotomized to create a supracondylar fracture. After the fracture reduction, all specimens were fixed in the coronal plane with divergent lateral entry pin configurations in four different patterns in the sagittal plane: AP, crossed, divergent and parallel sagittal pin configuration. Each configuration was tested with five loading patterns. The AP sagittal pin had significantly lower construct stiffness than the divergent (p = 0.003) and the parallel sagittal pin configuration (p = 0.005) in external rotation loading tests. The divergent sagittal pin had the highest construct stiffness in extension, valgus, and external rotation loads, but the parallel sagittal pin had lower construct stiffness under extension load than the divergent and crossed sagittal pin configurations. The divergent sagittal pin configuration provides greater construct stiffness than other sagittal pin configurations due to the maximal pin spreading distance at the fracture site and the pin angle lock mechanism.
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Noviana, Medi, und Sunny Arief Sudiro. „AUTOMATION OF THE BERT AND RESNET50 MODEL INFERENCE CONFIGURATION ANALYSIS PROCESS“. JITK (Jurnal Ilmu Pengetahuan dan Teknologi Komputer) 10, Nr. 2 (19.11.2024): 324–32. http://dx.doi.org/10.33480/jitk.v10i2.5053.
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Inference is the process of using models to make predictions on new data, performance is measured based on throughput, latency, GPU memory usage, and GPU power usage. The models used are BERT and ResNet50. The right configuration can be used to maximise inference. Configuration analysis needs to be done to find out which configuration is right for model inference. The main challenge in the analysis process lies in its inherent time-intensive nature and inherent complexity, making it a task that is not simple. The analysis needs to be made easier by building an automation programme. The automation programme analyses the BERT model inference configuration by dividing 10 configurations namely bert-large_config_0 to bert-large_config_9, the result is that the right configuration is bert-large_config_2 resulting in a throughput of 12.8 infer/sec with a latency of 618 ms. While the ResNet50 model is divided into 5 configurations, namely resnet50_config_0 to resnet50_config_4, the result is that the right configuration is resnet50_config_1 which produces a throughput of 120.6 infer/sec with a latency of 60.9 ms. The automation programme has the benefit of facilitating the process of analysing the inference configuration.
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Prasad Ojha, Durga, Devesh Kumar und V. G. K. M. Pisipati. „Smectogenic Behaviour of 7O.6 at it's Phase Transition Temperature: A Computational Analysis Reprint request to“. Zeitschrift für Naturforschung A 56, Nr. 12 (01.12.2001): 873–78. http://dx.doi.org/10.1515/zna-2001-1214.
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Abstract A computational analysis has been carried out to determine the configurational preference of a pair of Ar-(4-n-heptyloxybenzylidine)-4-hexylaniline (70.6) molecules with respect to translatory and orien tational motions. The CNDO/2 method has been employed to evaluate the net atomic charge and atom ic dipole components at each atomic centre of the molecule. The configurational energy has been com puted using the modified Rayleigh-Schrödinger perturbation method. The obtained energies were used to calculate the probability of each configuration at phase transition temperature, using Maxwell-Boltz-mann's formula. The flexibility of various configurations has been studied in terms of variations of the probability due to small departures from the most probable configuration. The results are discussed in the light of experimental as well as other theoretical observations. The smectogenic character of the molecule has been correlated with the parameters introduced in this paper.
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Sun, X. K., X. J. Xin und Z. J. Pei. „Finite Element Analysis of Die-Strength Testing Configurations for Thin Wafers“. Journal of Electronic Packaging 127, Nr. 2 (04.05.2004): 189–92. http://dx.doi.org/10.1115/1.1869510.
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This paper presents an assessment of four die-strength testing configurations using finite element analysis. The simulation indicates that ring-on-ring configuration is the best because it generates a uniform stress field on a large die surface area. The four-point-bend configuration ranks second and the three-point-bend configuration is third. The pin-on-ring configuration is the worst because the stress gradient is severe in the central region. To minimize uncertainty in the loading positions, it is advised that loading rings or bars with small radii be used.
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Fu, Rong, Jianting Guo, Renhao Wu und Haoran Liu. „Design and Hydrodynamic Performance Analysis of Offshore Multi-Module Floating Docks“. Journal of Physics: Conference Series 2565, Nr. 1 (01.08.2023): 012018. http://dx.doi.org/10.1088/1742-6596/2565/1/012018.
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Abstract This study presents a design scheme for a multi-module connected floating dock, comprising two configurations for the lower floating body: transverse and longitudinal floats. An articulated connection between the modules is also included. The hydrodynamic performance of the floating dock with these two configurations is compared and analyzed by taking the South China Sea as an example. Frequency and time-domain analysis methods are employed, considering the coupling between the mooring and the multi-module floating dock. The results indicate that, under the condition of both cross waves and oblique waves, the transverse float configuration exhibits superior motion response performance in all degrees of freedom compared to the longitudinal float configuration, particularly in terms of roll performance. Furthermore, the maximum mooring tension and connection structure load for the transverse float configuration are lower than those for the longitudinal float configuration, resulting in superior overall hydrodynamic performance.
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Zhang, Jialu, Ruzica Piskac, Ennan Zhai und Tianyin Xu. „Static detection of silent misconfigurations with deep interaction analysis“. Proceedings of the ACM on Programming Languages 5, OOPSLA (20.10.2021): 1–30. http://dx.doi.org/10.1145/3485517.
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The behavior of large systems is guided by their configurations: users set parameters in the configuration file to dictate which corresponding part of the system code is executed. However, it is often the case that, although some parameters are set in the configuration file, they do not influence the system runtime behavior, thus failing to meet the user’s intent. Moreover, such misconfigurations rarely lead to an error message or raising an exception. We introduce the notion of silent misconfigurations which are prohibitively hard to identify due to (1) lack of feedback and (2) complex interactions between configurations and code. This paper presents ConfigX, the first tool for the detection of silent misconfigurations. The main challenge is to understand the complex interactions between configurations and the code that they affected. Our goal is to derive a specification describing non-trivial interactions between the configuration parameters that lead to silent misconfigurations. To this end, ConfigX uses static analysis to determine which parts of the system code are associated with configuration parameters. ConfigX then infers the connections between configuration parameters by analyzing their associated code blocks. We design customized control- and data-flow analysis to derive a specification of configurations. Additionally, we conduct reachability analysis to eliminate spurious rules to reduce false positives. Upon evaluation on five real-world datasets across three widely-used systems, Apache, vsftpd, and PostgreSQL, ConfigX detected more than 2200 silent misconfigurations. We additionally conducted a user study where we ran ConfigX on misconfigurations reported on user forums by real-world users. ConfigX easily detected issues and suggested repairs for those misconfigurations. Our solutions were accepted and confirmed in the interaction with the users, who originally posted the problems.
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Jalaluddin, Akio Miyara, Rustan Tarakka und Muhammad Anis Ilahi Ramadhani. „Experimental Performance Analysis of Shallow Spiral-tube Ground Heat Exchangers in Series and Parallel Configurations“. E3S Web of Conferences 130 (2019): 01017. http://dx.doi.org/10.1051/e3sconf/201913001017.
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Ground source cooling system (GSCS) uses a ground heat exchanger (GHE) for exchanging heat with the ground. A spiral-tube GHE is gaining interest in recent year. This study presents an experimental analysis of thermal performance of shallow spiral-tube ground heat exchanger (GHE) installed in the ground at 3 m depth in series and parallel configurations. These GHE configurations offer a compromise between the conventional vertical and horizontal GHEs. The spiral-tube GHE which is consist of spiral pipe installed in the borehole provides a better performance in application of GSCS. The thermal performances ofspiraltube GHE in series and parallel configurations were investigated under actual condition. Inlet and outlet temperatures of the both configurations were measured and periodically recorded. The average heat exchange rates of the GHEs are 122.4 W m –1 in parallel configuration and 86.2 W m –1in series configuration. Heat exchange rate of the spiral-tube GHEs in parallel configuration provides a better performance than that of in series configuration. The spiral-tube GHE in shallow depth can be applied in the GSCS.
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Vidal-Silva, Cristian, Vannessa Duarte, Jesennia Cardenas-Cobo, Jorge Serrano-Malebran, Iván Veas und José Rubio-León. „Reviewing Automated Analysis of Feature Model Solutions for the Product Configuration“. Applied Sciences 13, Nr. 1 (23.12.2022): 174. http://dx.doi.org/10.3390/app13010174.
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Feature models (FMs) appeared more than 30 years ago, and they are valuable tools for modeling the functional variability of systems. The automated analysis of feature models (AAFM) is currently a thriving, motivating, and active research area. The product configuration of FMs is a relevant and helpful operation, a crucial activity overall with large-scale feature models. The minimal conflict detection, the diagnosis of in-conflict configuration, and the product completion of consistent partial configuration are significant operations for obtaining consistent and well-defined products. Overall, configuring products for large-scale variability intensive systems (VIS) asks for efficient automated solutions for minimal conflict, diagnosis, and product configuration. Given the relevance of minimal conflict, diagnosis, and product configuration, and the current application of large-scale configuration and FMs for representing those systems and products, the main goals of this research paper are to establish the fundaments of the product configuration of feature models and systematically review existing solutions for the conflict detection, diagnosis, and product completion in FMs from 2010 to 2019. We can perceive that even though modern computing approaches exist for AAFM operations, no solutions exist for assisting the product configurations before 2020. This article reports that in 2020, new solutions appear regarding applying parallel computing for those goals. This research highlights research opportunities for developing new and more efficient solutions for conflict detection, diagnosis, and product completion of large-scale configurations.
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Karger, A. „Singularity Analysis of Serial Robot-Manipulators“. Journal of Mechanical Design 118, Nr. 4 (01.12.1996): 520–25. http://dx.doi.org/10.1115/1.2826922.
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This paper is devoted to the description of the set of all singular configurations of serial robot-manipulators. For 6 degrees of freedom serial robot-manipulators we have developed a theory which allows to describe higher order singularities. By using Lie algebra properties of the screw space we give an algorithm, which determines the degree of a singularity from the knowledge of the actual configuration of axes of the robot-manipulator only. The local shape of the singular set in a neighbourhood of a singular configuration can be determined as well. We also solve the problem of escapement from a singular configuration. For serial robot-manipulators with the number of degrees of freedom different from six we show that up to certain exceptions singular configurations can be avoided by a small change of the motion of the end-effector. We also give an algorithm which allows to determine equations of the singular set for any serial robot-manipulator. We discuss some special cases and give examples of singular sets including PUMA 560.
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Morales-Morales, Josefa, Miguel A. Rivera-Cruz, Pedro Cruz-Alcantar, Horacio Bautista Santos, Ilse Cervantes-Camacho und Vladimir A. Reyes Herrera. „Performance Analysis of a Hybrid Electric Vehicle with Multiple Converter Configuration“. Applied Sciences 10, Nr. 3 (05.02.2020): 1074. http://dx.doi.org/10.3390/app10031074.
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The use of electric vehicles and their various configurations is seen as a major alternative in efforts towards reducing pollutant emissions from motor vehicles that continue to use fossil fuels. Electric transport technology presents more efficient means of energy conversion in vehicles: electric (EV), hybrid (VH), and hybrid electric (HEV) vehicles. For example, the energy storage system in the latter can be made up of ultracapacitors (UCs), batteries (Bs), and fuel cells. This work focuses on HEVs powered by batteries and ultracapacitors. In particular, the multiple converter configuration (C-CM) for the HEV powertrain system is analyzed using electric models of the vehicle powertrain components. To analyze the multiple converter configuration, parameters of a vehicle taken from the literature and the electrical model of the configuration were developed. With the above, the proposed configuration was evaluated before driving cycles (CITY II and ECE) and the configuration performance was compared with respect to other configurations. In the C-CM model, limitations in the choice of the number of Bs and UCs were observed in the powertrain depending on the maximum power of both energy sources and vehicle load demand. The results show that more energy is extracted from the batteries in the ECE cycle than in the CITY taking into account that the batteries are used as the main power source. C-CM results compared to other configurations show that energy extracted from batteries in the CITY is the same across all configurations. While energy consumption is lower in the ECE, C-CM results were not very significant compared to other configurations. However, the C-MC has the advantage of having better power flow control due to having two converters, thus improving HEV safety.
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Govardhan, D., K. Kameswara Surya Teja und L. Jayahari. „Gliding Analysis of Segmented Flapping Wing“. MATEC Web of Conferences 392 (2024): 01193. http://dx.doi.org/10.1051/matecconf/202439201193.
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A variety of aircraft morphing technologies have been investigated and represented by various researchers in the public domain. The morphing wing concepts involved the modification of aircraft wings during the in-flight course. Most of the technologies/concepts were based on biomimicry, where wing aerodynamic performance improved due to the change in wing shape. Here we describe a novel concept where in the flow parameters of airfoils arranged in configurations are investigated. The flow parameters are investigated using the numerical simulation tool ANSYS. A 2d flow simulation is performed using a Fluent solver to evaluate the flow configuration of the airfoils arranged in different configurations. The first configuration of airfoils is named a base, wherein the airfoils are arranged at zero angles of attack. The other two configurations are arranged by increasing the angular position of airfoils i.e., 15, 30, and 45 degrees. All these configurations are aerodynamically investigated at different sub-sonic speeds.
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Korkosz, Mariusz, Jan Prokop, Bartlomiej Pakla, Grzegorz Podskarbi und Piotr Bogusz. „Analysis of Open-Circuit Fault in Fault-Tolerant BLDC Motors with Different Winding Configurations“. Energies 13, Nr. 20 (13.10.2020): 5321. http://dx.doi.org/10.3390/en13205321.
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In this study, tests were carried out on a brushless permanent magnet DC motor with different winding configurations. Three configurations were compared: star, delta and combined star–delta. A mathematical model was constructed for the motor, taking into account the different winding configurations. An analysis of the operation of the motor in the different configurations was performed, based on numerical calculations. The use of different winding configurations affects the properties of the motor. This is significant in the case of the occurrence of various fault states. Based on numerical calculations, an analysis of an open-circuit fault in one of the phases of the motor was performed. Fast Fourier Transform—FFT analysis of the artificial neutral-point voltage was used for the detection of fault states. The results were verified by tests carried out under laboratory conditions. It was shown that the winding configuration has an impact on the behaviour of the motor in the case of an open circuit in one of the phases. The classical star configuration is the worst of the possible arrangements. The most favourable in this respect is the delta configuration. In the case of the combined star–delta configuration, the consequences of the fault depend on the location of the open circuit.
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Dubois, Anna, Kajsa Hulthén und Viktoria Sundquist. „Organising logistics and transport activities in construction“. International Journal of Logistics Management 30, Nr. 2 (13.05.2019): 620–40. http://dx.doi.org/10.1108/ijlm-12-2017-0325.
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Purpose The purpose of this paper is to identify and analyse how different ways of organising transport and logistics activities in construction impact on efficiency. The paper scrutinises three particular transport and logistics configurations: the de-centralised coordinated configuration, the on-site coordinated configuration and the supply network coordinated configuration. Design/methodology/approach Three configurations are derived from the literature and from case studies. The efficiency of the three configurations is analysed on three levels of analysis: the construction site, the supply chain, and across supply chains and construction sites. Findings The paper concludes that there are possibilities to enhance efficiency on all three levels of analysis by widening the scope of coordination beyond the individual construction site. Practical implications The analysis points to efficiency potentials in applying the supply network coordinated configuration, although this configuration puts high demands on collaboration amongst the actors involved. Originality/value The paper provides illustration, and explanation, of the efficiency potentials involved in the three configurations.
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Kuo, Chin-Hsing, und Hong-Sen Yan. „On the Mobility and Configuration Singularity of Mechanisms With Variable Topologies“. Journal of Mechanical Design 129, Nr. 6 (17.05.2006): 617–24. http://dx.doi.org/10.1115/1.2717230.
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The mechanisms with variable topologies (MVTs) are usually changing their topological structures in accordance with the varying mobility and quasi-singular configurations. The mobility analysis and configuration singularity of MVTs are studied via screw theory in this paper. The configurations of MVTs are formulated by a set of variable combinations of screw coordinates. For the mobility analysis, two examples provided show that the proposed approach is adoptable for dealing with common MVTs. For the configuration singularity, the concepts of stationary configuration and uncertainty configuration are utilized to demonstrate the topology varying strategy of MVTs. The result in this work provides the theoretical basis and inspiration for the configuration synthesis and analysis of mechanisms with variable topologies.
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Molina-Tamayo, Santiago, Andrés Yesid Moreno, Felipe Mendoza, Gabriel Espitia Mesa und Gilberto Osorio- Gómez. „Energy analysis of PV surfaces in BIPV applications“. E3S Web of Conferences 612 (2025): 04002. https://doi.org/10.1051/e3sconf/202561204002.
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This paper studies the power generation performance of flexible solar panels at different radii of curvature for both concave and convex configurations. Its performance is evaluated horizontally and vertically to provide architects and designers with a reference of how power generation is impacted depending on the geometries selected for the design of facades or roofs. The study consisted of two phases, the first comprised a simulation to estimate the amount of energy a surface receives according to its geometry, orientation, location, and simulated period. The second phase corresponds to an experimental validation, in which five geometries were tested: two concave, two convex, and one flat as a baseline. The results indicate that, for horizontal configurations, curvature radii from 2.51 times the minimum radius allow adequate power generation to be maintained. In the concave configuration, 77.8% of the power generated by a flat PV module is achieved, while in the convex configuration, 80.21% is achieved. For vertical configurations, the convex geometry with minimum radius shows the best performance, exceeding the power of a flat module by 12.1%. The convex configuration with a radius of curvature of 2.51 times the minimum radius offers 81.14% of the flat reference power.
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Backfrieder, Christian, und Gerald Ostermayer. „Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations“. International Journal of Electronics and Telecommunications 61, Nr. 2 (01.06.2015): 171–78. http://dx.doi.org/10.1515/eletel-2015-0022.
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Abstract This paper introduces an LTE system level simulator and presents investigations of scenarios with differently balanced traffic emergence between uplink and downlink as well as inhomogeneous distribution of link direction asymmetry. In the TDD mode of LTE, duplexing is implemented via sharing the time domain between uplink and downlink users. This is done by different switching configurations, which offer varying capacity distributions between downlink and uplink, from a downlink-heavy configuration with 90 percent of the capacity in downlink direction to uplink heavy configurations with 60 percent uplink. We utilize the available capacity perfectly by adjusting the link configuration appropriately to traffic emergence. Performance gains when selecting a configuration appropriate to the arising traffic compared to usage of a static configuration with equally distributed capacity are investigated. In case of different configurations, additional interference can occur in neighbored cells due to distinct communication direction at the same time. We clarify the differences between these scenarios and quantify the gains and losses when the switching point between uplink and downlink is variable.
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Zhang, Ziqiang, Hanlong Chen und Zining Zhang. „Configuration Synthesis and Performance Analysis of Finger Soft Actuator“. Applied Bionics and Biomechanics 2018 (13.08.2018): 1–14. http://dx.doi.org/10.1155/2018/4264560.
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Compared with the traditional rigid finger actuator, the soft actuator has the advantages of light weight and good compliance. This type of finger actuator can be used for data acquisition or finger rehabilitation training, and it has broad application prospects. The motion differences between the soft actuator and finger may cause extrusion deformation at the binding point, and the binding forces along nonfunctional direction may reduce drive efficiency. In order to reduce the negative deformation of soft structure and improve comfort, the configuration synthesis and performance analysis of the finger soft actuator were conducted for the present work. The configuration synthesis method for soft actuator was proposed based on the analysis of the physiological structure of the finger, and the soft actuator can make the human-machine closed-loop structure including n joints (n=1, 2, 3) meet the requirement of DOF (degrees of freedom). Then the typical feasible configurations were enumerated. The different typical configurations were analyzed and compared based on the establishment of mathematical models and simulation analysis. Results show that the configuration design method is feasible. This study offers a theoretical basis for designing the configuration of finger soft actuator.
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Tuononen, Ari J., und Antti Lajunen. „Modal analysis of different drivetrain configurations in electric vehicles“. Journal of Vibration and Control 24, Nr. 1 (09.03.2016): 126–36. http://dx.doi.org/10.1177/1077546316635857.
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This paper presents a modal analysis of different drivetrain configurations in electric vehicles; 1) an in – wheel motor, 2) direct drive, and 3) an electric motor with a reduction gear and a differential gear. A specific simulation model was developed to analyze the vibrations while taking into account the traction motor, possible mechanical reduction gears, and the driveshaft, as well as a Rigid Ring Model (RRM) to describe the tire. On the basis of the simulation results, the frequency responses were calculated for each drivetrain configuration and also for a non-drive, free-rolling tire. The analyzed results show interesting differences between the different drivetrain configurations. However, most of the negative aspects can be compensated for if identified in the early design phase. For instance, the frequency response of the in-wheel motor configuration indicated that the vibrations that occur might cause negative effects in terms of driving comfort and wheel speed signal noise. The direct drive configuration has an additional mode at 24 Hz, and the differential configuration at 4 Hz. It is possible that these modes would resonate strongly if some drivetrain design parameters were poorly defined.
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Gok, K., und S. Inal. „Biomechanical comparison using finite element analysis of different screw configurations in the fixation of femoral neck fractures“. Mechanical Sciences 6, Nr. 2 (09.09.2015): 173–79. http://dx.doi.org/10.5194/ms-6-173-2015.
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Abstract. In this research, biomechanical behaviors of five different configurations of screws used for stabilization of femoral neck fracture under axial loading have been examined, and which configuration is best has been investigated. A point cloud was obtained after scanning the human femoral model with a three dimensional (3-D) scanner, and this point cloud was converted to a 3-D femoral model by Geomagic Studio software. Femoral neck fracture was modeled by SolidWorks software for five different configurations: dual parallel, triple parallel, triangle, inverted triangle and square, and computer-aided numerical analysis of different configurations were carried out by ANSYS Workbench finite element analysis (FEA) software. For each configuration, mesh process, loading status (axial), boundary conditions and material model were applied in finite element analysis software. Von Mises stress values in the upper and lower proximity of the femur and screws were calculated. According to FEA results, it was particularly advantageous to use the fixation type of triangle configuration. The lowest values are found as 223.32 MPa at the lower, 63.34 MPa at the upper proximity and 493.24 MPa at the screws in triangle configuration. This showed that this configuration creates minimum stress at the upper and lower proximity of the fracture line. Clinically, we believe that the lowest stress values which are created by triangle configuration encompass the most advantageous method. In clinical practices, it is believed that using more than three screws does not provide any benefit. Furthermore, the highest stresses are as follows: at upper proximity 394.79 MPa in triple parallel configuration, for lower proximity 651.2 MPa in square configuration and for screw 2459 MPa in inverted triangle.
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Dubey, Sumeet Kumar, K. Ravi Kumar, Vinay Tiwari und Umish Srivastva. „Heat Transfer and Performance Analysis of NaMgH2F-based Thermochemical Energy Storage System“. International Journal of Engineering and Technology 16, Nr. 3 (2024): 149–54. http://dx.doi.org/10.7763/ijet.2024.v16.1272.
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Thermochemical energy storage systems are more suitable for high-temperature energy storage because of thermal stability and high energy storage density. Magnesium (Mg) based metal alloys and hydrides are found more suitable for high temperature energy storage applications among metal hydride-based thermochemical systems. The unit weight of NaMgH2F is used to analyze the energy sorption and heat transfer phenomenon. Initial metal hydride bed temperature variation and two heat transfer fluid flow arrangements are compared to study the heat transfer phenomenon and performance characteristics. The two initial metal hydride bed temperatures used in the analysis are 773 K and 823 K. Heat transfer flow Configuration 1 has axial tubes in the cross-section, while Configuration 2 has a circumferential fluid jacket along with the axial tubes. Both configurations have the same heat transfer area for the comparative study of heat transfer. The energy absorption was not affected significantly, but the energy desorption increased with an increase in metal hydride bed temperature and with the outer circumferential cooling jacket configuration. The energy storage efficiency of 93.2% and 94.4% is obtained for initial metal hydride bed temperatures of 773 K and 823 K with flow configuration 1, while the energy storage efficiency of 95.2% and 96.4% is obtained for 773 K and 823 K with flow Configuration 2.
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Mazzeo, Francesco, Emanuele L. de Angelis, Fabrizio Giulietti, Alessandro Talamelli und Francesco Leali. „Performance Analysis and Conceptual Design of Lightweight UAV for Urban Air Mobility“. Drones 8, Nr. 9 (20.09.2024): 507. http://dx.doi.org/10.3390/drones8090507.
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In the present study, a performance analysis of three different VTOL configurations is presented within an urban air mobility context. A classical lightweight helicopter was employed as a reference configuration to design a dual-rotor side-by-side helicopter and a hexacopter drone layout. An analytical model based on general momentum and blade element theories was developed for single- and multiple-rotor configurations in horizontal and vertical flight conditions. Suitable battery pack and electric motor designs were produced to evaluate the endurance and range of the different configurations for a specific mission. This paper provides fundamental insights into the endurance and range capabilities of multiple-rotor unmanned aerial vehicles (UAVs) and a qualitative discussion on the safety and acceptability features of each configuration implemented in an advanced air mobility context. As a result, the side-by-side helicopter configuration was identified as the best solution to be introduced within urban environments, fulfilling all the performance and mission requirements.
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Cañadas, Agustín Moreno, Pedro Fernando Fernández Espinosa, José Gregorio Rodríguez-Nieto, Odette M. Mendez und Ricardo Hugo Arteaga-Bastidas. „Extended Brauer analysis of some Dynkin and Euclidean diagrams“. Electronic Research Archive 32, Nr. 10 (2024): 5752–82. http://dx.doi.org/10.3934/era.2024266.
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<p>The analysis of algebraic invariants of algebras induced by appropriated multiset systems called Brauer configurations is a Brauer analysis of the data defining the multisets. Giving a complete description of such algebraic invariants (e.g., giving a closed formula for the dimensions of algebras induced by significant classes of Brauer configurations) is generally a tricky problem. Ringel previously proposed an analysis of this type in the case of Dynkin algebras, for which so-called Dynkin functions were used to study the numerical behavior of invariants associated with such algebras. This paper introduces two additional tools (the entropy and the covering graph of a Brauer configuration) for Brauer analysis, which is applied to Dynkin and Euclidean diagrams to define Dynkin functions associated with Brauer configuration algebras. Properties of graph entropies defined by the corresponding covering graphs are given to establish relationships between the theory of Dynkin functions, the Brauer configuration algebras theory, and the topological content information theory.</p>
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Nirwansyah, Ferdy. „Comparison Performance Analysis of HDD, SSD and NVME for OLTP Database Server“. Jurnal Syntax Admiration 5, Nr. 10 (31.10.2024): 4379–88. http://dx.doi.org/10.46799/jsa.v5i10.1730.
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Databases are an essential component of life in modern society. The database has become an online Transaction Processing (OLTP) operational support company. This study discusses the storage configuration in a virtual server database for OLTP Database with a benchmark against three storage configurations for four databases: SQL Server, MySQL, PostgreSQL, and MariaDB for Windows Server virtualization. Benchmarks using TPC-C to get the best performance from all three configurations have been tested. The results of this study show that the storage configuration of HDD as a virtual disk drive OS and NVME as a virtual disk drive database get better performance as online transaction processing (OLTP) compared to HDD as a virtual disk drive OS and HDD or SSD as a virtual disk drive database. Using the TPC-C benchmark, the study tested the performance of four databases (SQL Server, MySQL, PostgreSQL, and MariaDB) in various virtual storage configurations. The results of 36 experiments involving different numbers of virtual users (10, 50, and 100) showed that a hybrid configuration that used HDDs for the operating system and NVME for database storage provided the best performance. On SQL Server, SSD configurations show better results for smaller user loads. The results suggest that the combination of HDD and NVME is the optimal configuration for most databases in OLTP tasks, and it provides useful guidance in efficient storage investment decision-making. Further research is expected to be able to conduct tests.
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Cao, Jiajun, Yuefen Wang, Xin Xie, Yuanzhi Lv und Peng Chen. „Analysis of collaborative innovation behaviour and its influencing factors in scientific research crowdsourcing platforms: based on the fsQCA method“. Information Research an international electronic journal 29, Nr. 2 (18.06.2024): 206–29. http://dx.doi.org/10.47989/ir292823.
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Introduction. This study aims to explore the influencing factors and their combined effects on the benefits of knowledge innovation, and to explore the impact of factors on the effects of knowledge innovation from a configuration perspective. Method. This study constructed a knowledge innovation ecosystem for scientific research crowdsourcing platforms, as well as a configuration model that affects the knowledge innovation benefits of scientific research crowdsourcing. Based on this, we collected data through a survey questionnaire. Then, we used the method of fuzzy set qualitative comparative analysis to identify the configuration effects of influencing factors and analyse the core configuration. Analysis. Five core configurations were constructed, which are shown as internal and external linkage based on environmental dynamics, individual and environment interlocking based on team maintenance, individual initiative to supplement weaknesses, external drive driven, and individual led based on team and platform support. Results. The configurations have different focuses, but all highlight the core conditions for individual innovation investment as the configuration. Conclusion. The results indicate that individual driving factors are worth considering. Meanwhile, by referring to the core components of the five configurations, researchers can combine various factors to better form knowledge innovation.
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Bange, M. P., P. S. Carberry, J. Marshall und S. P. Milroy. „Row configuration as a tool for managing rain-fed cotton systems: review and simulation analysis“. Australian Journal of Experimental Agriculture 45, Nr. 1 (2005): 65. http://dx.doi.org/10.1071/ea03254.
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Rain-fed cotton production can be a significant proportion (average 17%) of the Australian Cotton Industry. One of the management techniques that rain-fed cotton growers have is to modify row configuration. Configurations that have entire rows missing from the sowing configuration are often referred to as ‘skip row’. Skip configurations are used to: increase the amount of soil water available for the crop, which can influence the potential lint yield; reduce the level of variability or risk associated with production; enhance fibre quality; and reduce input costs. Choosing the correct row configuration for a particular environment involves many, often complex, considerations. This paper presents an examination of how rain-fed cotton production in Australia is influenced by row configuration with different management and environmental factors. Data collated from field experiments and the cotton crop simulation model OZCOT, were used to explore the impact of agronomic decisions on potential lint yield and fibre quality and consequent economic benefit. Some key findings were: (i) soil water available at sowing did not increase the advantage of skip row relative to solid configurations; (ii) reduced row spacing (75 cm) did not alter lint yield significantly in skip row crops; (iii) skip row, rain-fed crops show reasonable plasticity in terms of optimum plant spacing within the row (simular to irrigated cotton); (iv) sowing time of rain-fed crops would appear to differ between solid and skip row arrangements; (v) skip row configurations markedly reduce the risk of price discounts due to short fibre or low micronaire and this should be carefully considered in the choice of row configuration; and (vi) skip configurations can also provide some savings in variable costs. In situations where rain-fed cotton sown in solid row configurations is subject to water stress that may affect lint yield or fibre quality, skip row configurations would be a preferential alternative to reduce risk of financial loss.
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Rodríguez Muñoz, José Luis, José Sergio Pacheco Cedeño, César Manuel Valencia Castillo und José de Jesús Ramírez Minguela. „Energy and exergy analysis of an ejector-compression refrigeration cycle with double IHX“. REVISTA DE CIENCIAS TECNOLÓGICAS 6, Nr. 3 (26.09.2023): e261. http://dx.doi.org/10.37636/recit.v6n3e261.
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This paper shows an energy and exergy analysis of an ejector-compression refrigeration cycle, in which two heat exchangers are included to the system: 1) between the condenser and liquid separator (IHX-1) and 2) between the condenser and the evaporator (IHX-2), which is an alternative configuration proposed and this configuration is defined as ERC+IHX-1+IHX-2. The effect of evaporation temperature and the heat exchanger effectiveness on the energy and exergy efficiencies and the irreversibilities of each component of the cycle have been analyzed for refrigeration and air conditioning applications. The results show that for the alternative configuration and an effectiveness of IHX-1=80%, it results slightly with a higher COP than when the configurations work with an effectiveness of IHX-2=80%. However, the exergy efficiency increases when the evaporation temperature decreases. The components that show the highest contribution to the irreversibilities in the ERC+IHX-1+IHX-2 configuration are: the condenser, the compressor and the evaporator; whereas that the lowest contribution is due to the expansion valve and IHX-1. In addition, the alternative configuration proposed presents a higher exergetic efficiency and lower irreversibilities than the configurations ERC+IHX-1 y ERC+IHX-2 reported in the literature.
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Chernin, A. D., A. V. Ivanov, A. V. Trofimov und S. Mikkola. „Triple galaxies: Configuration analysis“. Astronomical & Astrophysical Transactions 6, Nr. 3 (Januar 1995): 157–66. http://dx.doi.org/10.1080/10556799508232062.
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Tauheed, A., Y. N. Joshi und M. Steinitz. „Revised analysis of singly ionized tellurium: Te II“. Canadian Journal of Physics 87, Nr. 12 (Dezember 2009): 1255–68. http://dx.doi.org/10.1139/p09-087.
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Tellurium spectra were recorded on a 3 m normal incidence vacuum spectrograph in the spectroscopy laboratory of St. Francis Xavier University using a triggered spark light source. The spectrum of the singly ionized tellurium atom was investigated in the wavelength region 746–1838 Å using Hartree–Fock configuration interaction calculations involving 5s25p3, 5s5p4, 5s25p2 (5d + 6d + 7d + 8d + 6s + 7s + 8s + 9s) configurations. Earlier analysis by Handrup and Mack has been revised, and 27 new energy levels have been added, to complete the 5s25p3, 5s25p2 (5d + 6d + 6s + 7s) configurations. Now five levels of the ground-state configuration and 78 of the excited configurations are known. Two hundred and nineteen spectral lines have been classified in this spectrum. Least squares fitted parametric calculations were used for the final interpretation and LS percentage compositions. The wavelength accuracy of our measurement for unblended and sharp lines is ±0.005 Å.
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Miller, Danny. „Challenging trends in configuration research: Where are the configurations?“ Strategic Organization 16, Nr. 4 (05.09.2017): 453–69. http://dx.doi.org/10.1177/1476127017729315.
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The configuration approach to the study of organizations is enjoying increasing popularity, in part, due to the methodological advances of qualitative comparative analysis. I argue that there are significant contrasts between earlier taxonomic clustering and typology approaches to configuration and the newer ones being pursued with the qualitative comparative analysis methodology. I compare the two approaches and their application, arguing that what is missing in many studies, old and new, often due to the lack of qualitative evidence, is “configuration itself”—that is, contrasting common, thematic, and rich characterizations that provide insight into how organizations function.
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Yu, Hao, Jingyang Li und Hexi Baoyin. „Analysis of Aerodynamic Characteristics of Different Tail Configurations of Compound High-speed Helicopters“. Journal of Physics: Conference Series 2569, Nr. 1 (01.08.2023): 012030. http://dx.doi.org/10.1088/1742-6596/2569/1/012030.
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Abstract When a compound high-speed helicopter is in forward flight, there are serious aerodynamic disturbances among the fuselage components, among which the tail configuration has a greater influence on its aerodynamic performance. To study the influence of different tail configurations on aerodynamic performance, the flow field of a compound high-speed helicopter in forward flight was numerically simulated based on the commercial software XFlow. Firstly, the ROBIN standard helicopter fuselage model was calculated to verify the scientific validity of the method. Then, the aerodynamic data of a high-speed helicopter was analyzed for different tail configurations in forward flight with different angles of attack and yaw. The results show that the V-tail configuration has the lowest lift and resistance coefficients and the best longitudinal manoeuvrability and stall characteristics; the conventional tail configuration has the highest lift-to-resistance ratio and the fastest wake decay; the lateral stability of the V-tail and conventional tail configurations is weaker than that of the H-tail and fixed tail configurations; and the presence of the vertical tail in the tail increases the pressure value around the wing surface.
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Plugge, Albert, Shahrokh Nikou und Marijn Janssen. „A fuzzy-set qualitative comparative analysis of factors influencing successful shared service center implementation“. Industrial Management & Data Systems 122, Nr. 4 (29.03.2022): 920–41. http://dx.doi.org/10.1108/imds-09-2021-0573.
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PurposeOrganizations nowadays require services supplied by shared service centers (SSCs) to achieve organizational responsiveness. Previous contributions focused on distinct qualitative-explorative factors for explaining successful SSC implementation but failed to consider the interdependencies and combined effects between factors.Design/methodology/approachDrawing on complexity and configuration theories, this research employed a fuzzy-set qualitative comparative analysis (fsQCA). A unique dataset of 121 international firms was obtained to examine the combined effects of five conditions (factors), namely, modularization, standardization, decision-rights, portfolio and customer-orientation .FindingsThe findings show that multiple configurations of conditions (or solutions) can lead to successful SSC implementation. The fsQCA results indicated that portfolio and standardization are perceived as core conditions in all configurations. Firms that focus on portfolio and continuous evaluation of customer-orientation are more likely to be successful. Furthermore, in some configurations, the size of the firm size matters.Research limitations/implicationsThe cross-sectional survey data might be a potential limitation. In future research, a more extensive survey can be collected to help generalize the results.Practical implicationsSuccess factors are dependent on the SSC configuration. Standardization, portfolio management and regular evaluations of changing customer services by executive management are needed.Originality/valueTo the best of the authors' knowledge, there is no academic study that examines SSC implementation based on salient conditions using a configurational thinking approach. As such, the findings of the research allow us to better understand the causal complexity and interdependencies between essential SSC factors.
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Andrica, Dorin, Cătălin Barbu und Laurian-Ioan Pişcoran. „The geometry of Blundon's configuration“. Journal of Mathematical Inequalities, Nr. 2 (2019): 415–22. http://dx.doi.org/10.7153/jmi-2019-13-27.
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Decreusefond, L. „Wasserstein Distance on Configuration Space“. Potential Analysis 28, Nr. 3 (04.03.2008): 283–300. http://dx.doi.org/10.1007/s11118-008-9077-5.
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Ashraf, Fahmida, Tehmina Ambreen, Cheol Woo Park und Dong-IK Kim. „Comparative evaluation of ballet-type and conventional stent graft configurations for endovascular aneurysm repair: A CFD analysis“. Clinical Hemorheology and Microcirculation 78, Nr. 1 (02.06.2021): 1–27. http://dx.doi.org/10.3233/ch-200996.
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PURPOSE: Cross limb stent graft (SG) configuration technique for endovascular aneurysm repair (EVAR) is employed for splayed aortic bifurcations to avoid device kinking and smoothen cannulation. The present study investigates three types of stent graft (SG) configurations for endovascular aneurysm repair (EVAR) in abdominal aortic aneurysm. A computational fluid dynamic analysis was performed on the pulsatile non-Newtonian flow characteristics in three ideally modeled geometries of abdominal aortic (AA) SG configurations. METHODS: The three planar and crosslimb SG configurations were ideally modeled, namely, top-down nonballet-type, top-down ballet-type, and bottom-up nonballet-type configurations. In top-down SG configuration, most of the device is deployed in the main body in the vicinity of renal artery and the limbs are extended to the iliac artery. While in the bottom-up configuration, some of the SG device is deployed in the main body, the limbs are deployed in aortic bifurcation, and the extra stent graft of the main body is extended to the proximal aorta until the below of the renal artery. The effects of non-Newtonian pulsatile flow on the wall stresses and flow patterns of the three models were investigated and compared. Moreover, the average wall shear stress (AWSS), oscillatory shear stress index (OSI), absolute helicity, pressure distribution, graft displacement and flow visualization plots were analyzed. RESULTS: The top-down ballet-type showed less branch blockage effect than the top-down nonballet-type models. Furthermore, the top-down ballet-type configuration showed an increased tendency to sustain high WSS and higher helicity characteristics than that of the bottom-up and top-down non-ballet type configurations. However, displacement forces of the top-down ballet-type configuration were 40% and 9.6% higher than those of the bottom-up and top-down nonballet-type configurations, respectively. CONCLUSIONS: Some complications such as graft tearing, thrombus formation, limb disconnection during long term follow up periods might be relevant to hemodynamic characteristics according to the configurations of EVAR. Hence, the reported data required to be validated with the clinical results.
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Albeverio, S., Yu G. Kondratiev und M. Röckner. „Analysis and Geometry on Configuration Spaces“. Journal of Functional Analysis 154, Nr. 2 (April 1998): 444–500. http://dx.doi.org/10.1006/jfan.1997.3183.
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Valentim, Antão Rodrigo, Jhon Ramírez Behainne und Aldo Braghini Junior. „Thermal Performance Analysis of Materials and Configurations for Cylindrical Sidewalls of Charcoal Kilns“. Energies 15, Nr. 16 (13.08.2022): 5872. http://dx.doi.org/10.3390/en15165872.
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Most of the charcoal in the world comes from small and medium-sized producers, using rudimentary carbonization kilns that require significant time or energy during the heating and cooling stages of the process. Despite advances in improving the performance, the influence of materials used in the sidewalls of these kilns has been scarcely studied. Therefore, based on numerical simulations, the present study analyses the thermal performance of cylindrical sidewalls composed of combinations of metallic materials, ceramic materials, and insulating blankets grouped in three configurations: configuration I (sidewall with just one material), configuration II (sidewall with two materials assembled in series), and configuration III (pivoting sidewall). Results were encouraging, especially when comparing kiln configuration I with the novel configuration III. Simulations suggested that the proposed configuration III could reduce the heating time by 62%, the cooling time by 91%, the heat supplied to sidewalls by 80%, and the heat loss to the external environment by 99.7%. The save of wood charged into the charcoal kiln grew up to 7.3 times, varying the thickness of the inner layer of the sidewall.
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Septyaningrum, E., R. Hantoro, I. K. A. P. Utama, J. Prananda, G. Nugroho, A. W. Mahmasani und N. A. Satwika. „Performance analysis of multi-row vertical axis hydrokinetic turbine–straight blade cascaded (VAHT-SBC) turbines array“. Journal of Mechanical Engineering and Sciences 13, Nr. 3 (27.09.2019): 5665–88. http://dx.doi.org/10.15282/jmes.13.3.2019.28.0454.
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Due to its high energy concentration, hydrokinetic energy from tidal and rivers flow provides great expectation. One of the effective ways to meet the energy production target is to reduce the installation and maintenance effort arranging turbines in such configuration, known as hydrokinetic turbine array. The performance of array configuration is affected by turbine position and rotational direction. This research provides a comprehensive analysis of the effect of turbine rotational direction and position on the array performance. The experimental study and URANS simulation were carried out to gain deeper information. This previous study proposed 3 side-by-side configurations, i.e. Co-rotating” (Co), “counter-rotating-in” (CtI) and “counter-rotating-out” (CtO) and the current study proposed 2 multi-row configurations, i.e. 3T-A and 3T-B. The comprehensive information is provided. Both experimental and numerical study confirmed that the velocity superposition in the interaction zone gives the constructive effect on turbine performance. All site-by-site configurations is able to enhance farm effectiveness. Co configuration is recommended to install in the resource having unpredictable flow direction. However, the CtI is for canal or river since it has better performance. The study for multi-row configuration shows that the downstream turbine has performance decrement due to the bad effect of the upstream turbine wake.
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Dong, Xichao, Chang Cui, Yuanhao Li und Cheng Hu. „Geosynchronous Spaceborne-Airborne Bistatic Moving Target Indication System: Performance Analysis and Configuration Design“. Remote Sensing 12, Nr. 11 (03.06.2020): 1810. http://dx.doi.org/10.3390/rs12111810.
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Geosynchronous spaceborne-airborne bistatic synthetic aperture radar (GEO SA-BSAR), consisting of GEO transmitter and airborne receiver, has stable coverage for a long time and benefits moving target detection. However, the performance of GEO SA-BSAR moving target indication (MTI) system varies widely between bistatic configurations. The traditional configuration design for GEO SA-BSAR system only considers the imaging performance, which may cause the poor MTI performance. In this paper, we propose a bistatic configuration design method to jointly optimize the MTI and SAR imaging performance for GEO SA-BSAR MTI system. The relationship between the MTI performance and bistatic configuration parameters is derived analytically and analyzed based on the maximum output signal to clutter and noise ratio (SCNR) criterion. Then, the MTI performance and SAR imaging performance are jointly considered to model the configuration design problem as a multi-objective optimization problem under the constrained condition. Finally, the optimal configuration for GEO SA-BSAR MTI system is given.
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Lin, Ming Dong, Zhen Yu Ma, Wei Hua Zhang und Min Xiang. „Configuration Analysis of Supercavitating Vehicles Based on Equivalent Pressure Center Method“. Applied Mechanics and Materials 143-144 (Dezember 2011): 63–68. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.63.
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Based on a detailed modeling of supercavitating flight, the Equivalent Pressure Center (EPC) method is proposed in this paper. To validating the proposed method, both of EPC and integrated moment, which are highly concerned during configuration design process for supercavitating motion, are studied for different configuration parameters including aspect ratio, fin position and cavitator size of the body. As the relative pitch angle between cavity and the vehicle would change with flight status, well designed vehicle configurations could produce better stability and maneuverability performances by locating the EPC close to the mass center. With detailed analysis of the EPC result, some of the propositional results for configuration parameters of supercavitating vehicles are given.
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Prasanna, Lakshmi, und T. R. Jyothsna. „Analysis of Cascaded Asymmetric Inverters using Low Frequency Technique“. WSEAS TRANSACTIONS ON POWER SYSTEMS 19 (09.05.2024): 171–91. http://dx.doi.org/10.37394/232016.2024.19.18.
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Multilevel inverters include a wide range of configurations and numerous benefits. Since each level switching angle is not neatly prepared, most conventional inverters cannot produce optimized waveforms. To attain an adequate voltage profile, we should indeed closely review the switching angle arrangement to attain a minimal Total Harmonic Distortion (THD). This work focuses on Cascaded H Bridge (CHB) multilevel inverters with asymmetrical configuration operating under a low frequency (LF) scheme. This work discusses various methods of harmonic mitigation techniques that comes under the LF scheme which includes the finest switching angle optimizations for generating various levels. Furthermore, the effectiveness of the topologies is investigated by minimizing lower-order harmonics and THD. THD is compared for various mitigation techniques for seven and nine-level configurations. The proposed configurations are simulated by employing MATLAB/Simulink. THD is calculated theoretically and evaluated by comparing it to simulated results for the suggested inverters. Additionally, thermal simulations of the configuration are carried out in PLECS to estimate power losses and efficiency. The suggested configurations are examined utilizing OPAL-RT (4510) test bed and the outcomes are included.
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Zaslavski, Alexander J. „Generic uniqueness of minimal configurations with rational rotation numbers in Aubry-Mather theory“. Abstract and Applied Analysis 2004, Nr. 8 (2004): 691–721. http://dx.doi.org/10.1155/s1085337504310067.
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We study(h)-minimal configurations in Aubry-Mather theory, wherehbelongs to a complete metric space of functions. Such minimal configurations have definite rotation number. We establish the existence of a set of functions, which is a countable intersection of open everywhere dense subsets of the space and such that for each elementhof this set and each rational numberα, the following properties hold: (i) there exist three different(h)-minimal configurations with rotation numberα; (ii) any(h)-minimal configuration with rotation numberαis a translation of one of these configurations.
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Aziz, Aqib, und Yongjie Shi. „Impact of Rotor-to-Rotor Interactions on the Tonal Noise Characteristics of Different Octocopter Configurations“. Aerospace 11, Nr. 12 (13.12.2024): 1022. https://doi.org/10.3390/aerospace11121022.
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Rotor-to-rotor interactions have been found to significantly contribute to acoustic characteristics. The present research presents a novel idea to conduct comparative studies on the aeroacoustics characteristics of conventional, coaxial, and hybrid octocopter configurations in hover and steady forward flight to identify the configuration that has minimal noise levels. Moreover, the influence of vertical spacing in the coaxial octocopter is explored, and an aeroacoustics comparison of coaxial and hybrid configurations with larger-diameter rotors in the same confined vehicle space for missions that require a high thrust is presented at the end. The virtual blade method (VBM) is employed herein for aerodynamic analysis due to its high computational efficiency, and a numerical analysis code based on FWH equations is developed for the acoustics analysis. The hover results show that coaxial configurations produce a peak SPL value of 93 dB, which is 5 dB louder than the conventional configuration and 3 dB louder than the hybrid configuration. The coaxial configuration with 0.125 R vertical spacing produced a peak SPL of 92 dB, which is 5 dB louder than the 0.5 R and 10 dB louder than the 1.5 R. In steady forward flight with normal-sized rotors, the hybrid configuration outperformed the others with a peak SPL value of 85 dB, which is 7 dB lower than that of the conventional configuration; meanwhile, the other configurations had similar noise values. The noise attributed to larger rotors in a confined vehicle space during hover flight in the coaxial configuration is 5 dB less than that of the hybrid configuration at almost all elevation angles in the farfield; meanwhile, a 5 dB difference was observed in the front half of the vehicle in forward flight and minute differences were found in the rear half.
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Destainville, N., R. Mosseri und F. Bailly. „Configurational entropy in random tilings: A geometrical analysis in configuration space“. Mathematical and Computer Modelling 26, Nr. 8-10 (Oktober 1997): 313–14. http://dx.doi.org/10.1016/s0895-7177(97)00214-8.
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Silva-Muñoz, Moisés, Alberto Franzin und Hugues Bersini. „Automatic configuration of the Cassandra database using irace“. PeerJ Computer Science 7 (05.08.2021): e634. http://dx.doi.org/10.7717/peerj-cs.634.
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Database systems play a central role in modern data-centered applications. Their performance is thus a key factor in the efficiency of data processing pipelines. Modern database systems expose several parameters that users and database administrators can configure to tailor the database settings to the specific application considered. While this task has traditionally been performed manually, in the last years several methods have been proposed to automatically find the best parameter configuration for a database. Many of these methods, however, use statistical models that require high amounts of data and fail to represent all the factors that impact the performance of a database, or implement complex algorithmic solutions. In this work we study the potential of a simple model-free general-purpose configuration tool to automatically find the best parameter configuration of a database. We use the irace configurator to automatically find the best parameter configuration for the Cassandra NoSQL database using the YCBS benchmark under different scenarios. We establish a reliable experimental setup and obtain speedups of up to 30% over the default configuration in terms of throughput, and we provide an analysis of the configurations obtained.
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Topini, Edoardo, Marco Pagliai und Benedetto Allotta. „Dynamic Maneuverability Analysis: A Preliminary Application on an Autonomous Underwater Reconfigurable Vehicle“. Applied Sciences 11, Nr. 10 (14.05.2021): 4469. http://dx.doi.org/10.3390/app11104469.
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Since the development of the first autonomous underwater vehicles, the demanded tasks for subsea operations have become more and more challenging as, for instance, intervention, maintenance and repair of seabed installations, in addition to surveys. As a result, the development of autonomous underwater reconfigurable vehicles (AURVs) with the capability of interacting with the surrounding environment and autonomously changing the configuration, according to the task at hand, can represent a real breakthrough in underwater system technologies. Driven by these considerations, an innovative AURV has been designed by the Department of Industrial Engineering of the University of Florence (named as UNIFI DIEF AURV), capable of efficiently reconfiguring its shape according to the task at hand. In particular, the UNIFI DIEF AURV has been provided with two extreme configurations: a slender (“survey”) configuration for long navigation tasks, and a stocky (“hovering”) configuration designed for challenging goals as intervention operations. In order to observe the several dynamic features for the two different configurations, a novel formulation for the dynamic maneuverability analysis (DMA) of an AURV, adapting Yoshikawa’s well-known manipulability theory for robotic arms, is proposed in this work. More specifically, we introduce a novel analysis which relates the vehicle body-fixed accelerations with the rotational speed of each thruster, taking into account also the AURV dynamic model for each configuration and the propulsion system.
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Rand, Omri, und Vladimir Khromov. „Compound Helicopter: Insight and Optimization“. Journal of the American Helicopter Society 60, Nr. 1 (01.01.2015): 1–12. http://dx.doi.org/10.4050/jahs.60.012001.
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The paper presents an insight into the complex task of design and optimizing a compound helicopter configuration. It introduces the “drag versus power chart” (DP chart) as a tool for separating the rotors, thrusters, wings, and fuselage contributions and understanding their optimal combination in a generic compound configuration. The analysis shows the dependency of the optimal configuration on the efficiencies of the rotors, the thrusters, and the wings, and a way to carefully examine the effect of many design parameters. As such, the analysis may be applied to various configurations including single and coaxial rotor systems. Among other conclusions, it is shown when and why a thruster is absolutely essential for high speed and clarifies the role of the wing in such cases. The paper also supplies a unique optimization process, which is based on a comprehensive and detailed nonlinear free-wake analysis of a compound configuration that includes a thruster and fixed wings. The optimization process is twofold: First, for a global search, a variety of randomly selected configurations are analyzed to determine an initial hover-forward flight Pareto frontier. Then, various types of local analyses are carried out to improve the above frontier. Such successive frontier refinements lead to an improved, detailed, and continuous frontier that may be exploited for a variety of missions. The configurations on the resulting Pareto frontier show design trade-offs between configurations that are more efficient in hover and those that are more efficient in high-speed forward flight.
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Tian, Hai Bo, Hong Wei Ma und Yi Shu Zhang. „Design and Principle Analysis of Wheel-Tracked Robot’s Mobile Mechanism“. Applied Mechanics and Materials 644-650 (September 2014): 238–41. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.238.
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Integrating the merits of wheeled and tracked mechanism, a robot’s mobile mechanism may have more adaptability in field environments. A kind of metamorphic mechanism with three configurations was proposed, which configuration transformation was analyzed and metamorphic equations on configuration transformations were put forward. Based on them, a wheel-tracked robot’s mobile mechanism was brought forward. The key component of the structure, locomotion-mode-changing unit, was synthesized. The robot’s prototype was made and the principle test was finished. The result shows that the built prototype can run by wheels or tracks, and transform itself successfully.