Letteratura scientifica selezionata sul tema "MmW reliability"
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Articoli di riviste sul tema "MmW reliability"
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Baybayan, Jericho Y., e Michelle R. Lacia. "An Achievement Test in Mathematics in the Modern World Course: The Standardization Process". International Journal of Multidisciplinary: Applied Business and Education Research 5, n. 7 (23 luglio 2024): 2459–73. http://dx.doi.org/10.11594/ijmaber.05.07.08.
Testo completoAbstract (sommario):
This study aimed to construct and standardize an achievement test in Mathematics in the Modern World (MMW) course. Achievement test evaluates a student’s performance after a given period of instruction. Using the instrumentation research design, the data were gathered among 273 tertiary students of Notre Dame University enrolled during the second semester of Academic Year 2020-2021. Among these, 38 pilot tested and 213 tested the reliability of the instrument. This study further utilized the following: a 4-point Likert scale for the validation of the instrument, difficulty value and discrimination index formulas for the analysis of each item, and KR20 reliability for internal consistency. Furthermore, a test manual for the MMW achievement test was also established. The preliminary total number of Items before MMW teachers’ validation was 42 items covering the topics for the first 12 hours of the MMW Syllabus. These items were validated through Aiken’s Item Validity method which resulted in the acceptance of 42 items. After rigorous processes, it resulted in the acceptance of 34 items for the MMW achievement test. The instrument’s average validity is 0.935, and the reliability is 0.701 which means that this tool has high validity and acceptable reliability.
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Goldsmith, Chuck, John Maciel e John McKillop. "Demonstrating Reliability". IEEE Microwave Magazine 8, n. 99 (2007): x2. http://dx.doi.org/10.1109/mmw.2007.4383488.
Testo completo
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Magoba, Moses, e Mimonitu Opuwari. "Petrophysical interpretation and fluid substitution modelling of the upper shallow marine sandstone reservoirs in the Bredasdorp Basin, offshore South Africa". Journal of Petroleum Exploration and Production Technology 10, n. 2 (7 novembre 2019): 783–803. http://dx.doi.org/10.1007/s13202-019-00796-1.
Testo completoAbstract (sommario):
Abstract The fluid substitution method is used for predicting elastic properties of reservoir rocks and their dependence on pore fluid and porosity. This method makes it possible to predict changes in elastic response of a rock saturation with different fluids. This study focused on the Upper Shallow Marine sandstone reservoirs of five selected wells (MM1, MM2, MM3, MM4, and MM5) in the Bredasdorp Basin, offshore South Africa. The integration of petrophysics and rock physics (Gassmann fluid substitution) was applied to the upper shallow marine sandstone reservoirs for reservoir characterisation. The objective of the study was to calculate the volume of clay, porosity, water saturation, permeability, and hydrocarbon saturation, and the application of the Gassmann fluid substitution modelling to determine the effect of different pore fluids (brine, oil, and gas) on acoustic properties (compressional velocity, shear velocity, and density) using rock frame properties. The results showed average effective porosity ranging from 8.7% to 16.6%, indicating a fair to good reservoir quality. The average volume of clay, water saturation, and permeability values ranged from 8.6% to 22.3%, 18.9% to 41.6%, and 0.096–151.8 mD, respectively. The distribution of the petrophysical properties across the field was clearly defined with MM2 and MM3 revealing good porosity and MM1, MM4, and MM5 revealing fair porosity. Well MM4 revealed poor permeability, while MM3 revealed good permeability. The fluid substitution affected rock property significantly. The primary velocity, Vp, slightly decreased when brine was substituted with gas in wells MM1, MM2, MM3, and MM4. The shear velocity, Vs, remained unaffected in all the wells. This study demonstrated how integration of petrophysics and fluid substitution can help to understand the behaviour of rock properties in response to fluid saturation changes in the Bredasdorp Basin. The integration of these two disciplines increases the obtained results’ quality and reliability.
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Li, Yibing, Jie Chen, Fang Ye e Dandan Liu. "The Improvement of DS Evidence Theory and Its Application in IR/MMW Target Recognition". Journal of Sensors 2016 (2016): 1–15. http://dx.doi.org/10.1155/2016/1903792.
Testo completoAbstract (sommario):
ATR system has a broad application prospect in the military field, especially in the field of modern defense technology. When paradoxes are in existence in ATR system due to adverse battlefield environment, integration cannot be effectively and reliably carried out only by traditional DS evidence theory. In this paper, a modified DS evidence theory is presented and applied in IR/MMW target recognition system. The improvement of DS evidence theory is realized by three parts: the introduction of sensor priority and evidence credibility to realize the discount processing of evidences, the modification of DS combination rule to enhance the accuracy of synthesis results, and the compound decision-making rule. The application of the modified algorithm in IR/MMW system is designed to deal with paradoxes, improve the target recognition rate, and ensure the reliability of target recognition system. Experiments are given to illustrate that the introduction of the modified DS evidence theory in IR/MMW system is better able to realize satisfactory target recognition performance through multisensor information fusion than any single-mode system.
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Liu, Yunpeng, Kaifeng Liu, Jiang Mi e Mingbo Luo. "Distributed Multi-MMW Radar Fusion for Target Detection and Tracking in Highway Traffic Environment". Mathematical Problems in Engineering 2023 (15 aprile 2023): 1–11. http://dx.doi.org/10.1155/2023/5537122.
Testo completoAbstract (sommario):
High-resolution millimeter-wave (MMW) radar is viewed as a low-cost and highly reliable sensor compared to camera, lidar, etc., in moving scenarios and thus has been selected by highway stakeholders as an important roadside detector to detect the movement of traffic vehicles and monitor traffic flow in real time. However, the echo signal of MMW radar in complex highway environment contains not only the signal reflected by target but also spurious signals and other interference signals, which significantly affects the estimation of the target movement state. To solve this problem, an improved vehicle tracking method is designed to simultaneously estimate the polar angle and polar radius in coordinator of MMW radar. Moreover, considering the movement patterns of target vehicles in dynamic uncertain traffic situations, a set of state space models, such as CA, CV, and CT are combined to represent the vehicle movement. In addition, based on the enhanced detection performance of a single radar, the combination of multiple MMW radars’ information was performed to determine the sequential trajectory of the target vehicle on the continuous road sections; then, the historical trajectory of the target vehicle was correlated and fused. Real experiments in highway scenarios show that the method used in this study is effective in deriving the trajectory of the vehicle and improving the positioning accuracy and reliability when the vehicle performs heavy maneuvers.
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Hou, Wenkui, Wanyu Li e Pengyu Li. "Fault Diagnosis of the Autonomous Driving Perception System Based on Information Fusion". Sensors 23, n. 11 (26 maggio 2023): 5110. http://dx.doi.org/10.3390/s23115110.
Testo completoAbstract (sommario):
The reliability of autonomous driving sensing systems impacts the overall safety of the driving system. However, perception system fault diagnosis is currently a weak area of research, with limited attention and solutions. In this paper, we present an information-fusion-based fault-diagnosis method for autonomous driving perception systems. To begin, we built an autonomous driving simulation scenario using PreScan software, which collects information from a single millimeter wave (MMW) radar and a single camera sensor. The photos are then identified and labeled via the convolutional neural network (CNN). Then, we fused the sensory inputs from a single MMW radar sensor and a single camera sensor in space and time and mapped the MMW radar points onto the camera image to obtain the region of interest (ROI). Lastly, we developed a method to use information from a single MMW radar to aid in diagnosing defects in a single camera sensor. As the simulation results show, for missing row/column pixel failure, the deviation typically falls between 34.11% and 99.84%, with a response time of 0.02 s to 1.6 s; for pixel shift faults, the deviation range is between 0.32% and 9.92%, with a response time of 0 s to 0.16 s; for target color loss, faults have a deviation range of 0.26% to 2.88% and a response time of 0 s to 0.05 s. These results prove the technology is effective in detecting sensor faults and issuing real-time fault alerts, providing a basis for designing and developing simpler and more user-friendly autonomous driving systems. Furthermore, this method illustrates the principles and methods of information fusion between camera and MMW radar sensors, establishing the foundation for creating more complicated autonomous driving systems.
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da Silva, Claudio Bastos, Rafael da Silva Ferraz e Horacio Tertuliano Santos. "An Analysis of the Fading Channel Valid for Frequencies Up to the mmW Range". Journal of Computational and Theoretical Nanoscience 18, n. 6 (1 giugno 2021): 1754–58. http://dx.doi.org/10.1166/jctn.2021.9727.
Testo completoAbstract (sommario):
The fading phenomenon in mobile communications is mainly a stochastic process and plays an essential role in the reliability and stability of the systems. The frequency bands currently in use it is reasonably well characterized and described. With the use of mmW, only experimental, theoretical models are being proposed; there is no unanimity regarding a model that effectively contemplates the phenomenon in this spectrum range. Some studies suggest the traditional models applied to the frequencies in use; Rician and Rayleigh are the main ones. This study aims to advance and compare, with accepted models, a broader statistical model that overcomes the limitations of the current models. It will be analyzed and compared a model using the Nakagami-m distribution covering a greater range of possibilities, given the low spreading capacity of mmW and the need for links almost always LOS situation in which the Rician model fails.
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da Silva, Claudio Bastos, Rafael da Silva Ferraz e Horacio Tertuliano Santos. "An Analysis of the Fading Channel Valid for Frequencies Up to the mmW Range". Journal of Computational and Theoretical Nanoscience 18, n. 6 (1 giugno 2021): 1754–58. http://dx.doi.org/10.1166/jctn.2021.9727.
Testo completoAbstract (sommario):
The fading phenomenon in mobile communications is mainly a stochastic process and plays an essential role in the reliability and stability of the systems. The frequency bands currently in use it is reasonably well characterized and described. With the use of mmW, only experimental, theoretical models are being proposed; there is no unanimity regarding a model that effectively contemplates the phenomenon in this spectrum range. Some studies suggest the traditional models applied to the frequencies in use; Rician and Rayleigh are the main ones. This study aims to advance and compare, with accepted models, a broader statistical model that overcomes the limitations of the current models. It will be analyzed and compared a model using the Nakagami-m distribution covering a greater range of possibilities, given the low spreading capacity of mmW and the need for links almost always LOS situation in which the Rician model fails.
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Jing, Rui, Zhenqi Jiang e Xiaoying Tang. "Advances in Millimeter-Wave Treatment and Its Biological Effects Development". International Journal of Molecular Sciences 25, n. 16 (8 agosto 2024): 8638. http://dx.doi.org/10.3390/ijms25168638.
Testo completoAbstract (sommario):
This comprehensive review critically examines the current state of research on the biological effects of millimeter-wave (MMW) therapy and its potential implications for disease treatment. By investigating both the thermal and non-thermal impacts of MMWs, we elucidate cellular-level alterations, including changes in ion channels and signaling pathways. Our analysis encompasses MMW’s therapeutic prospects in oncology, such as inducing apoptosis, managing pain, and modulating immunity through cytokine regulation and immune cell activation. By employing a rigorous methodology involving an extensive database search and stringent inclusion criteria, we emphasize the need for standardized protocols to enhance the reliability of future research. Although MMWs exhibit promising therapeutic potential, our findings highlight the urgent need for further elucidation of non-thermal mechanisms and rigorous safety assessments, considering the intricate nature of MMW interactions and inconsistent study outcomes. This review underscores the importance of focused research on the biological mechanisms of MMWs and the identification of optimal frequencies to fully harness their therapeutic capabilities. However, we acknowledge the challenges of variable study quality and the necessity for advanced quality control measures to ensure the reproducibility and comparability of future investigations. In conclusion, while MMW therapy holds promise as a novel therapeutic modality, further research is imperative to unravel its complex biological effects, establish safety profiles, and optimize treatment protocols before widespread clinical application.
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Jin, Tianshi, Chenxi Zhang, Yikang Zhang, Mingliang Yang e Weiping Ding. "A Hybrid Fault Diagnosis Method for Autonomous Driving Sensing Systems Based on Information Complexity". Electronics 13, n. 2 (14 gennaio 2024): 354. http://dx.doi.org/10.3390/electronics13020354.
Testo completoAbstract (sommario):
In the context of autonomous driving, sensing systems play a crucial role, and their accuracy and reliability can significantly impact the overall safety of autonomous vehicles. Despite this, fault diagnosis for sensing systems has not received widespread attention, and existing research has limitations. This paper focuses on the unique characteristics of autonomous driving sensing systems and proposes a fault diagnosis method that combines hardware redundancy and analytical redundancy. Firstly, to ensure the authenticity of the study, we define 12 common real-world faults and inject them into the nuScenes dataset, creating an extended dataset. Then, employing heterogeneous hardware redundancy, we fuse MMW radar, LiDAR, and camera data, projecting them into pixel space. We utilize the “ground truth” obtained from the MMW radar to detect faults on the LiDAR and camera data. Finally, we use multidimensional temporal entropy to assess the information complexity fluctuations of LiDAR and the camera during faults. Simultaneously, we construct a CNN-based time-series data multi-classification model to identify fault types. Through experiments, our proposed method achieves 95.33% accuracy in detecting faults and 82.89% accuracy in fault diagnosis on real vehicles. The average response times for fault detection and diagnosis are 0.87 s and 1.36 s, respectively. The results demonstrate that the proposed method can effectively detect and diagnose faults in sensing systems and respond rapidly, providing enhanced reliability for autonomous driving systems.
Tesi sul tema "MmW reliability"
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Hai, Joycelyn. "fiabilité rf en technologie soi cmos : modélisation et application à un amplificateur de puissance". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT033.
Testo completoAbstract (sommario):
Le développement de la technologie SOI CMOS a contribué à l'évolution rapide des systèmes de communication RF/mmW qui jouent un rôle critique dans le déploiement des réseaux 5G. Pour répondre aux objectifs de performance des spécifications 5G, des schémas de modulation complexes utilisent des niveaux de puissance crête sur puissance moyenne (PAPR) élevés générés par l'amplificateur de puissance (PA). Ces niveaux de puissance élevés ont un impact important sur la fiabilité du dispositif en raison des limites en tension de la technologie CMOS moderne. Dans les premières étapes de la conception, des modèles de vieillissement précis peuvent être utilisés pour évaluer le compromis entre les performances et la fiabilité en considérant le profil de mission RF spécifique. Les deux mécanismes de fiabilité CMOS principaux trouvés dans les profils de mission RF PA sont l'injection de porteurs chauds (HCI) et le claquage d’oxyde de grille en état « off » (off-TDDB). La première partie de cette thèse vise à consolider le modèle de vieillissement HCI en utilisant une méthodologie de vieillissement RF/mmW bien établie en effectuant une corrélation modèle-hardware (MHC) dans des conditions de stress DC accélérées et RF 28GHz pour différentes topologies de cellules PA. La MHC, validée pour le transistor PA avant (appelé « fresh ») et après la dégradation, est ensuite utilisée pour effectuer une analyse de sensibilité basée sur la simulation afin d'évaluer l'impact des différents paramètres de carte de modèle sur la précision de la modélisation RF HCI. Les résultats ont montré que la précision du modèle « fresh »et dégradé peut influencer l'estimation de la dégradation RF, ce qui souligne l'importance d'un modèle de dégradation décrit par les effets physiques du transistor. La deuxième partie de cette thèse se concentre sur la validité de l'approche de modélisation RF pour la fiabilité « off-state » (dégradation HCI et TDDB). Une structure de test intégrée générant des formes d'ondes de stress RF off-state à DC, 500 MHz et 1 GHz pour évaluer la dépendance en fréquence dans la modélisation de la fiabilité RF off-state. Une dégradation paramétrique suivant une loi en puissance a été observée suite aux mesures de stress HCI « off-state » en DC et RF (500 MHz et 1 GHz), suggérant la validité de l'approche de modélisation quasi-statique pour la dégradation HCI. D'autre part, la caractérisation off-TDDB RF montrent une augmentation du temps de claquage avec l'augmentation de la fréquence, en particulier un facteur de gain de x2 à 1 GHz par rapport à TDDB DC. Cette étude a ensuite été étendue aux séquences de stress HCI RF « on-state » et « off-state », révélant une interaction négligeable entre les deux mécanismes de dégradation, ce qui donne lieu à une approche de modélisation de dégradation additive. La dernière partie de cette thèse fournit une preuve de concept pour démontrer la compensation du vieillissement d'un PA RF à 28 GHz. Cela s’appuie sur la conception d'une boucle de rétroaction négative pour le contrôle de polarisation adaptatif « body-bias » sur puce en technologie FDSOI qui compense partiellement la dérive de tension de seuil induite par le stress HCI RFThe development of SOI CMOS technology has greatly contributed to the rapid evolution of RF/mmW communication systems which play a critical role in the deployment of 5G networks. To meet the performance targets of 5G specifications, complex modulation schemes use high peak-to-average-power (PAPR) levels that are generated by the power amplifier (PA). The high-power levels, in turn, impact the device reliability due to the voltage handling limits of modern CMOS technology. At early design stages, accurate aging models can be leveraged to assess the trade-off between performance and reliability in consideration of the targeted RF mission profile. The two dominant CMOS reliability mechanisms found in RF PA mission profiles are hot-carrier injection (HCI) and off-state time-dependent dielectric breakdown (off-TDDB). The first part of this thesis aims to consolidate the HCI aging model using well-established RF/mmW aging methodology by performing model-to-hardware correlation (MHC) at accelerated DC and 28GHz RF stress conditions for different PA cell topologies. The MHC, validated for fresh and degraded PA device, is then used to perform a simulation-based sensitivity analysis to evaluate the impact of different model card parameters on the accuracy of RF HCI modeling. The results showed that both fresh and degradation model precision affects the RF degradation estimation, which highlights the significance of a degradation model described by physical effects of the device. The second part of this thesis focuses on the validity of RF modeling approach for off-state reliability (HCI degradation and TDDB). An integrated test structure generating off-state RF stress waveforms at DC, 500MHz and 1GHz to evaluate the frequency dependence in off-state reliability modeling has been designed. Time-power law parametric degradation has been observed in DC and RF (500MHz and 1GHz) off-state HCI stress measurements, suggesting the validity of quasi-static modeling approach for off-state HCI degradation. On the other hand, off-state RF TDDB characterization demonstrate increasing time-to-breakdown with increasing frequency, in particularly a gain factor of x2 at 1GHz compared to DC TDDB. This study was then extended to on and off-state RF HCI stress sequences revealing negligible interaction between the two degradation mechanisms, resulting in an additive degradation modeling approach. The last part of this thesis provides proof of concept to demonstrate aging compensation of a 28GHz RF PA. This is done by implementing the design of a negative feedback loop for on-chip adaptive body bias control in FDSOI technology which partially compensates the threshold voltage drift induced by RF HCI stress
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Ighilahriz, Salim. "Caractérisation et modélisation de la fiabilité des transistors et circuits millimétriques conçus en technologies BiCMOS et CMOS". Phd thesis, Université de Grenoble, 2014. http://tel.archives-ouvertes.fr/tel-01060162.
Testo completoAbstract (sommario):
De nos jours, l'industrie de la microélectronique développe des nouvelles technologies qui permettent l'obtention d'applications du quotidien alliant rapidité, basse consommation et hautes performances. Pour cela, le transistor, composant actif élémentaire et indispensable de l'électronique, voit ses dimensions miniaturisées à un rythme effréné suivant la loi de Moore de 1965. Cette réduction de dimensions permet l'implémentation de plusieurs milliards de transistors sur des surfaces de quelques millimètres carrés augmentant ainsi la densité d'intégration. Ceci conduit à une production à des coûts de fabrication constants et offre des possibilités d'achats de produits performants à un grand nombre de consommateurs. Le MOSFET (Metal Oxide Semiconductor Field Effect Transistor), transistor à effet de champ, aussi appelé MOS, représente le transistor le plus utilisé dans les différents circuits issus des industries de la microélectronique. Ce transistor possède des longueurs électriques de 14 nm pour les technologies industrialisables les plus avancées et permet une densité intégration maximale spécialement pour les circuits numériques tels que les microprocesseurs. Le transistor bipolaire, dédié aux applications analogiques, fut inventé avant le transistor MOS. Cependant, son développement correspond à des noeuds technologiques de génération inférieure par rapport à celle des transistors MOS. En effet, les dimensions caractéristiques des noeuds technologiques les plus avancés pour les technologies BiCMOS sont de 55 nm. Ce type de transistor permet la mise en oeuvre de circuits nécessitant de très hautes fréquences d'opération, principalement dans le secteur des télécommunications, tels que les radars anticollisions automobiles fonctionnant à 77 GHz. Chacun de ces types de transistors possède ses propres avantages et inconvénients. Les avantages du transistor MOS reposent principalement en deux points qui sont sa capacité d'intégration et sa faible consommation lorsqu'il est utilisé pour réaliser des circuits logiques. Sachant que ces deux types de transistors sont, de nos jours, comparables du point de vue miniaturisation, les avantages offerts par le transistor bipolaire diffèrent de ceux du transistor MOS. En effet, le transistor bipolaire supporte des niveaux de courants plus élevés que celui d'un transistor MOS ce qui lui confère une meilleure capacité d'amplification de puissance. De plus, le transistor bipolaire possède une meilleure tenue en tension et surtout possède des niveaux de bruit électronique beaucoup plus faibles que ceux des transistors MOS. Ces différences notables entre les deux types de transistors guideront le choix des concepteurs suivant les spécifications des clients. L'étude qui suit concerne la fiabilité de ces deux types de transistors ainsi que celle de circuits pour les applications radio fréquences (RF) et aux longueurs d'ondes millimétriques (mmW) pour lesquels ils sont destinés. Il existe dans la littérature de nombreuses études de la fiabilité des transistors MOS. Concernant les transistors bipolaires peu d'études ont été réalisées. De plus peu d'études ont été menées sur l'impact de la fiabilité des transistors sur les circuits. L'objectif de ce travail est d'étudier le comportement de ces deux types de transistors mais aussi de les replacer dans le contexte de l'utilisateur en étudiant la fiabilité de quelques circuits parmi les plus usités dans les domaines hyperfréquence et millimétrique. Nous avons aussi essayé de montrer qu'il était possible de faire évoluer les règles de conception actuellement utilisées par les concepteurs tout en maintenant la fiabilité attendue par les clients.
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Beddard, Antony James. "Factors affecting the reliability of VSC-HVDC for the connection of offshore windfarms". Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/factors-affecting-the-reliability-of-vschvdc-for-the-connection-of-offshore-windfarms(ed389e21-7795-49bf-b2fa-9deaed36ede1).html.
Testo completoAbstract (sommario):
The UK Government has identified that nearly 15% of the UK’s electricity generation must come from offshore wind by 2020. The reliability of the offshore windfarms and their electrical transmission systems is critical for their feasibility. Offshore windfarms located more than 50-100km from shore, including most Round 3 offshore windfarms, are likely to employ Voltage Source Converter (VSC) High Voltage Direct Current (HVDC) transmission schemes. This thesis studies factors which affect the reliability of VSC-HVDC transmission schemes, in respect to availability, protection, and system modelling. The expected availability of VSC-HVDC systems is a key factor in determining if Round 3 offshore windfarms are technically and economically viable. Due to the lack of publications in this area, this thesis analyses the energy availability of a radial and a Multi-Terminal (MT) VSC-HVDC system, using component reliability indices derived from academic and industrial documentation, and examining the influence of each component on the system’s energy availability. An economic assessment of different VSC-HVDC schemes is undertaken, highlighting the overall potential cost savings of HVDC grids. The connection of offshore windfarms to a MT HVDC system offers other potential benefits, in comparison to an equivalent radial system, including a reduction in the volume of assets and enhanced operational flexibility. However, without suitable HVDC circuit breakers, a large MT HVDC system would be unviable. In this thesis, a review of potential HVDC circuit breaker topologies and HVDC protection strategies is conducted. A HVDC circuit breaker topology, which addresses some of the limitations of the existing designs, was developed in this thesis, for which a UK patent application was filed. Accurate simulation models are required to give a high degree of confidence in the expected system behaviour. Modular Multi-level Converters (MMCs) are the preferred HVDC converter topology, however modelling MMCs in Electromagnetic Transient (EMT) simulation programs has presented a number of challenges. This has resulted in the development of new modelling techniques, for which the published validating literature is limited. In this thesis these techniques are compared in terms of accuracy and simulation speed and a set of modelling recommendations are presented. Cable models are the other main DC component which, upon analysis, is found to have a significant impact on the overall model’s simulation results and simulation time. A set of modelling recommendations are also presented for the leading cable models. Using the modelling recommendations to select suitable MMC models, radial and MT EMT MMC-HVDC models for the connection of typical Round 3 windfarms are developed in this thesis. These models are used to analyse the steady-state and transient performance of the connections, including their compliance to the GB grid code for AC disturbances and reactive power requirements. Furthermore, the MT model is used to investigate the effect of MT control strategies on the internal MMC quantities.
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Lahbib, Insaf. "Contribution à l'analyse des effets de vieillissement de composants actifs et de circuits intégrés sous contraintes DC et RF en vue d'une approche prédictive". Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC256.
Testo completoAbstract (sommario):
Les travaux de cette thèse portent sur la simulation de la dégradation des paramètres électriques des transistors MOS et bipolaires sous stress statiques et dynamiques. Cette étude a été menée à l’aide d’un outil de simulation de fiabilité développé en interne. Selon la technologie MOS ou bipolaire, les mécanismes étudiés ont été successivement : Hot Carrier Injection, Bias Temperature instability, Mixed Mode et Reverse base emitter bias. L’investigation a été aussi étendue au niveau circuit. Nous nous sommes ainsi intéressés à l’effet de la dégradation des transistors sur la fréquence d’un oscillateur en anneau et les performances RF d’un amplificateur faible bruit. Les circuits ont été soumis à des contraintes DC , AC et RF. La prédictibilité, établie de ces dégradations, a été validée par des essais de vieillissement expérimentaux sur des démonstrateurs encapsulés et montés sur PCB. Les résultats de ces études ont permis de valider la précision du simulateur et la méthode de calcul quasi-statique utilisée pour calculer les dégradations sous stress dynamiques. Ces travaux de recherche ont pour but d’inscrire cette approche prédictive dans un flot de conception de circuits afin d’assurer leur fiabilitéThe work of this thesis focuses on the simulation of the electrical parameters degradation of MOS and bipolar transistors under static and dynamic stresses. This study was conducted using an in-house reliability simulation tool. According to the MOS or bipolar technology, the studied mechanisms were successively: Hot Carrier Injection, Bias Temperature instability, Mixed Mode and Reverse base emitter bias. The investigation was then extended to circuit-level. The effect of transistors degradation on a ring oscillator frequency and the RF performances of a low noise amplifier were investigated. The circuits were subjected to DC, AC and RF constraints. Predictability of these degradations has been validated by experimental aging tests on encapsulated and PCB-mounted demonstrators. The results of these studies proved the accuracy of the simulator and validated the quasi-static calculation method used to predict the degradation under dynamic stress. The goal of this research is to embed this predictive approach into a circuit design flow to ensure its reliability
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Najmi, Vahid. "Modeling, Control and Design Considerations for Modular Multilevel Converters". Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/53703.
Testo completoAbstract (sommario):
This thesis provides insight into state-of-the-art Modular Multilevel Converters (MMC) for medium and high voltage applications. Modular Multilevel Converters have increased in interest in many industrial applications, as they offer the following advantages: modularity, scalability, reliability, distributed location of capacitors, etc. In this study, the modeling, control and design considerations of modular based multilevel converters, with an emphasis on the reliability of the converter, is carried out. Both modular multilevel converters with half-bridge and full-bridge sub-modules are evaluated in order to provide a complete analysis of the converter. From among the family of modular based hybrid multilevel converters, the newly released Alternate Arm Converter (AAC) is considered for further assessment in this study. Thus, the modular multilevel converter with half-bridge and full-bridge power cells and the Alternate Arm Converter as a commercialized hybrid structure of this family are the main areas of study in this thesis. Finally, the DC fault analysis as one of the main issues related to conventional VSC converters is assessed for Modular Multilevel Converters (MMC) and the DC fault ride-through capability and DC fault current blocking ability is illustrated in both the Modular Multilevel Converter with Full-Bridge (FB) power cells and in the Alternate
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Arm Converter (AAC). Accordingly, the DC fault control scheme employed in the converter and the operation of the converter under the fault control scheme are explained.
The main contributions of this study are as follows: The new D-Q model for the MMC is proposed for use in the design of the inner and outer loop control. The extended control scheme from the modular multilevel converter is employed to control the Alternate Arm Converters. A practical reliability-oriented sub-module capacitor bank design is described based on different reliability modeling tools. A Zero Current Switching (ZCS) scheme of the Alternate Arm Converter is presented in order to reduce the switching losses of the Director Switches (DS) and, accordingly, to implement the ZCS, a design procedure for the Arm inductor in the AAC is proposed. The capacitor voltage waveform is extracted analytically in different load power factors and the waveforms are verified by simulation results. A reliability-oriented switching frequency analysis for the modular multilevel converters is carried out to evaluate the effect of the switching frequency on the MMC's operation. For the latter, a DC fault analysis for the MMC with Full-Bridge (FB) power cells and the AAC is performed and a DC fault control scheme is employed to provide the capacitor voltage control and DC fault current limit, and is illustrated herein.Master of Science
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Havlíková, Marie. "Diagnostika systémů s lidským operátorem". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233473.
Testo completoAbstract (sommario):
The doctoral thesis is thematically focused to human operator systems significantly contributing to this system reliability and safety. The theoretical part of the thesis is concerned with human activities and communications in MMS system, valuation and estimation of human reliability probability in MSS. The important part of the thesis is also a description of human operator neuromuscular system as an executive powerful system on MMS system regulating activities and the summary of human driver models in compensative lateral car control. The practical part of the doctoral thesis is based on analyses created by experimental data of drives. Experimental drives were done on drivers set following different backgrounds and different sleep deprivation at whole day. All experimental data was realized from the cooperation and following the agreement of Faculty of Transportation Science research centre on Prague ČVUT. Another part of thesis includes driver simulation model proposals with nonlinear components for lateral car control. Simulation model drives are compared with real drives or drivers on drive-simulator and there are monitored identical and different dynamic movement characteristics. The main target of doctoral thesis is to detect and obtain significant dynamical drive experience characteristics based on experimental data analyses. As well to found drive characters variability owing to driver’s fatigue and determinated evaluated characteristics changes. Acquired results of thesis should help in assistant systems that in cooperation with other components alert to micro-sleep and run off drive possibility.
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Tsai, Yueh-Lin, e 蔡岳霖. "Reliability Analysis for the Stability of MSW Landfills on Slope Considering Rainfall-Infiltration". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/15050363716714240819.
Testo completoAbstract (sommario):
碩士淡江大學
水資源及環境工程學系碩士班
99
Due to limited land resources and high population density, a large portion of municipal solid waste (MSW) landfills in Taiwan are constructed in mountainous regions. Being located at the sub-tropical area and surrounded by sea, slopes are usually unstable because of the concentrated rainfall during the wet period and thus failures of MSW landfills occurred occasionally. As to slope stability analysis, safety factors are common used in engineering practice. However, this deterministic approach not only does not consider the influence of randomness and uncertainties of soil properties, analysis model and associated parameters on the analysis results, but also has not any implications about the failure probability of the critical state according to the factor of safety. In this research, a probabilistic method to evaluate the reliability for the stability of MSW landfills on slope is proposed. The rainfall conditions and uncertainties of each analysis parameter will be taken into account. By the probabilistic approach, the evaluation results will be more representative with application value. In this research, the software, GeoStudio, is used to analyze the stability of MSW landfills on slope considering rainfall-infiltration. Seepage analysis is carried out by SEEP/W module to simulate the pore water pressure distribution, and then the slope stability of MSW landfills is assessed by SLOPE/W module. Parameter studies are first done to explore the influence of factors on the stability of MSW landfills. These factors include rainfall intensity (I), rainfall duration (T), rainfall pattern (RP), and the geometric and mechanical properties of MSW landfills, including height of landfill (H), length of landfill (L), slope angle of the back (α), slope angle of the waste body (β), unit weight of waste, unit weight of geomembrane, cohesion of waste, cohesion of geomembrane, friction angle of waste, and interfacial friction angle of geomembrane. Then 100 different combinations of parameters are generated and associated stability analyses of MSW landfills on slope are performed assumed that each parameter is uniform distributed around its reason ranges. Following, the performance of the stability of MSW landfills is interpreted by the artificial neural network (ANN) trained and verified according to the above-mentioned 100 analysis results. The rainfall fragilities for the stability of MSW landfills are then evaluated by first-order reliability method (FORM), or Monte-Carlo simulation (MCS) in terms of different level of required factor of safety based on varied rainfall intensity, duration, pattern, etc. The evaluation model of ANN-based FORM or ANN-based MCS proposed in this study is superior to traditional reliability method, such as first-order second-moment method (FOSM), in view of many aspects, such as system modeling, computational efficiency, and analysis precision. Based on these methods, the rainfall-related reliability of the MSW landfills on slope can be assessed easily, efficiently and accurately. It can be used as an effective auxiliary tool to design the countermeasures for disaster mitigations.
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Santhosh, L. G. "Reliability Based Approach for Evaluation of MSW Landfill Designs and Site Selection using GIS". Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3203.
Testo completoAbstract (sommario):
Dumping of municipal solid waste (MSW) generated due to anthropogenic activities in any barren land or out fields causes severe hazards to human populations, ecosystems and the environment. In order to avoid this, it is required to design landfills in an engineered and scientific manner. Therefore, it is necessary to understand the behaviour of landfills over a period of time, to design landfills for site specific conditions. In this thesis such an attempt is made to evaluate performance of conventional landfill system using a large scale anaerobic reactor in the laboratory. The performance of the containment (bottom liner and final cover) systems is evaluated through numerical modelling and reliability based analysis. Response Surface Methodology (RSM) is used to develop linear regression models. Influence of various parameters and their uncertainty on the reliability of the containment systems are studied for various scenarios and conditions. Reliability assessment of containment systems play a decisive role in taking remedial measures in order to reduce its adverse affects on the environment and human health in the vicinity of landfill sites. On the other hand, pre-assessment of risk guides the engineers, planners and decision makers in achieving the goal of sustainable solid waste management as well as safe landfills. The thesis also includes assessment of vulnerability of groundwater to contamination, identification and ranking of suitable sites for municipal solid waste (MSW) disposal in the Bengaluru district, using remote sensing and Geographic information system (GIS) integrated with analytical hierarchy process (AHP), a multi criteria decision making tool. The study considers various land use, geological, hydrogeological and environmental factors as criteria. As a result, two most suitable locations are identified around the Bengaluru city and their descriptions are provided. Further, reliability analysis of the suitability of sites is evaluated considering criteria as random variables. The proposed reliability based approach helps the decision makers and planners to choose site locations having low probability of environmental pollution. The provided methods in the thesis can be effectively used for engineered design of landfills.
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Santhosh, L. G. "Reliability Based Approach for Evaluation of MSW Landfill Designs and Site Selection using GIS". Thesis, 2016. http://hdl.handle.net/2005/3203.
Testo completoAbstract (sommario):
Dumping of municipal solid waste (MSW) generated due to anthropogenic activities in any barren land or out fields causes severe hazards to human populations, ecosystems and the environment. In order to avoid this, it is required to design landfills in an engineered and scientific manner. Therefore, it is necessary to understand the behaviour of landfills over a period of time, to design landfills for site specific conditions. In this thesis such an attempt is made to evaluate performance of conventional landfill system using a large scale anaerobic reactor in the laboratory. The performance of the containment (bottom liner and final cover) systems is evaluated through numerical modelling and reliability based analysis. Response Surface Methodology (RSM) is used to develop linear regression models. Influence of various parameters and their uncertainty on the reliability of the containment systems are studied for various scenarios and conditions. Reliability assessment of containment systems play a decisive role in taking remedial measures in order to reduce its adverse affects on the environment and human health in the vicinity of landfill sites. On the other hand, pre-assessment of risk guides the engineers, planners and decision makers in achieving the goal of sustainable solid waste management as well as safe landfills. The thesis also includes assessment of vulnerability of groundwater to contamination, identification and ranking of suitable sites for municipal solid waste (MSW) disposal in the Bengaluru district, using remote sensing and Geographic information system (GIS) integrated with analytical hierarchy process (AHP), a multi criteria decision making tool. The study considers various land use, geological, hydrogeological and environmental factors as criteria. As a result, two most suitable locations are identified around the Bengaluru city and their descriptions are provided. Further, reliability analysis of the suitability of sites is evaluated considering criteria as random variables. The proposed reliability based approach helps the decision makers and planners to choose site locations having low probability of environmental pollution. The provided methods in the thesis can be effectively used for engineered design of landfills.
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Mahapatra, Shilpi. "Optimum of reinforced soil walls (RSW) for vertical expansion of msw landfills-a reliability based approach". Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7998.
Testo completoLibri sul tema "MmW reliability"
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V, Zaretsky Erwin, United States. National Aeronautics and Space Administration. Scientific and Technical Information Program. e Lewis Research Center, a cura di. MMC life system development (phase I): A NASA/Pratt & Whitney Life Prediction Cooperative Program. [Cleveland, Ohio]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.
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Measurement Modeling And Evaluation Of Computing Systems And Dependability And Fault Tolerance 16th International Giitg Conference Mmb Dft 2012 Kaiserslautern Germany March 1921 2012 Proceedings. Springer, 2012.
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Zaporozhets, A. O., e V. P. Babak. Control of fuel combustion in small and medium power boilers. PH “Akademperiodyka”, 2020. http://dx.doi.org/10.15407/akademperiodyka.418.128.
Testo completoAbstract (sommario):
The monograph deals with the problems of increasing the effi ciency of fuel combustion and reducing emissions of harmful substances in boilers with a capacity of up to 3.5 MW. Approaches for the formation of stoichiometric air-fuel mixtures in boilers are developed. Th e method for indirect determination of the concentration of air components was developed, which allows to increase the metrological characteristics of gas-analyzing devices. Methods, algorithms and programs to automate the combustion control process, while ensuring the reliability of the data, are created. A system for monitoring the fuel combustion process was developed, and it was implemented on the basis of the NIISTU-5 boiler unit. For researchers, engineers, as well as lecturers and postgraduates of higher educational institutions and scientifi c institutions, working in the fi eld of engineering and optimization in the energy.
Capitoli di libri sul tema "MmW reliability"
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Gavrilenko, I., N. Karpenko e A. Litvinov. "DIAGNOSTICS OF FUNCTIONAL RELIABILITY OF PIPELINE SYSTEMS". In Intelligent computer-integrated information technology in project and program management, 54–63. Riga, Latvia: ISMA University of Applied Science, 2020. http://dx.doi.org/10.30837/mmp.2020.054.
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d’Alessandro, V., C. Maneux, G. G. Fischer, K. Aufinger, A. Magnani, S. Russo e N. Rinaldi. "Reliability". In Silicon-Germanium Heterojunction Bipolar Transistors for Mm-wave Systems Technology, Modeling and Circuit Applications, 185–234. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339519-6.
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Li, Mengyi, Yue Wang, Chengzhi Zhu, Jiazhuo Xuan e Chaoliang Wang. "Reliability Analysis Based on MMC Valve Operating Conditions in HVDC System". In Proceedings of PURPLE MOUNTAIN FORUM 2019-International Forum on Smart Grid Protection and Control, 447–58. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9779-0_37.
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Yin, Taiyuan, Yue Wang, Zhuling Li, Qiao Kang, Chengzhi Zhu e Jiazhuo Xuan. "Reliability Analysis of MMC Based on Junction Temperature Calculation in HVDC System". In Proceedings of PURPLE MOUNTAIN FORUM 2019-International Forum on Smart Grid Protection and Control, 509–21. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9779-0_42.
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Wang, Tingting, Pengqiang Geng, Miaocheng Weng e Fang Liu. "Study on Critical Shaft Length in Underground Metro Tunnel with One End to Outside". In Lecture Notes in Civil Engineering, 130–41. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_12.
Testo completoAbstract (sommario):
AbstractA 1:15 small-scale model was built based on a blocked tunnel at one end of Chongqing rail transit, the reliability of FDS numerical simulation was verified by experiments. Adopts the FDS18.0 software for the shaft seal at the end of the tunnel, and discusses the fire location, fire heat release rate on the effects of the shaft of natural smoke extraction mode when fire between seal and shaft, shaft smoke exhaust volume significantly greater than other fire source position, the critical length of shaft is bigger, when fire heat release rate between 2.5 MW to 7.5 MW. The critical shaft length decreases with the increase of shaft height, but has nothing to do with the heat release rate of fire source. A critical shaft length prediction model for tunnel closure at one end is proposed.
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Novoselov, S., O. Sychova e S. Tesliuk. "MULTIFLOWED SOFTWARE MOTION CONTROL TECHNOLOGY FOR A TWO-LINK MANIPULATOR WITH FOUR DEGREES OF FREEDOM". In Innovative integrated computer systems in strategic project management. Press of the Kharkiv National University of Radioelectronics, 2022. http://dx.doi.org/10.30837/mmp.2022.151.
Testo completoAbstract (sommario):
This paper describes a multiflowed software motion control technology for a two-link manipulatorwith four degrees of freedom. The proposed technology uses a set of independent timers that allowto realize independent control flows of program execution. This technology uses the developeddatabase structure to store the control program structure, which is a set of instructions, conditionaland unconditional transition operators, waiting commands with the possibility of connecting tothe PLC I/O ports via Modbus protocol. A characteristic feature of the proposed technology ofexecuting commands in the program is the concept of folders. Folders in this sense are a groupingof commands that constitute a certain cyclic sequence of actions for the manipulator. Folders arenot a visual component, but the essence, uniting several commands, executed one after another,in a database. An angular manipulator motion control program using visual components hasbeen developed. Testing of the developed program was carried out, which showed its performanceand reliability of the execution of commands given by the operator.
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Hoang, Giang Thi Linh, e Bao Trang Thi Nguyen. "Mixed Methods Designs". In Considerations and Techniques for Applied Linguistics and Language Education Research, 30–52. IGI Global, 2024. http://dx.doi.org/10.4018/979-8-3693-6482-6.ch002.
Testo completoAbstract (sommario):
Mixed methods research (MMR) has gradually gained popularity as a desirable procedure to provide robust insights into a problem or research question. Referred to as the third major “research paradigm,” MMR marks a turning point where the two previous movements of quantitative and qualitative methods are combined. This chapter begins with the definition of MMR before walking researchers through the key issues, including research problems that can be best addressed using MMR, core and complex mixed methods designs, the formulation of research questions in MMR studies, data collection, analysis and integration in MMR, and reliability and validity in conducting MMR studies. The chapter folds into its discussion exemplary mixed methods studies in applied linguistics and language learning so that readers can start visualizing their own MMR projects in their topics of interest.
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Yusuf, Ibrahim, e Ismail Muhammad Musa. "The Optimal System for Complex Series-Parallel Systems with Cold Standby Units: A Comparative Analysis Approach". In Practical Applications in Reliability Engineering. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95274.
Testo completoAbstract (sommario):
The purpose of this research is to propose three reliability models (configurations) with standby units and to study the optimum configuration between configurations analytically and numerically. The chapter considered the need for 60 MW generators in three different configurations. Configuration 1 has four 15 MW primary units, two 15 MW cold standby units and one 30 MW cold standby unit; Configuration 2 has three 20 MW primary units, three 20 cold standby units; Configuration 3 has two 30 MW primary units and three 30 MW cold standby units. Some reliability features of series–parallel systems under minor and complete failure were studied and contrasted by the current. Failure and repair time of all units is assumed to be exponentially distributed. Explanatory expressions for system characteristics such as system availability, mean time to failure (MTTF), profit function and cost benefits for all configurations have been obtained and validated by performing numerical experiments. Analysis of the effect of different system parameters on the function of profit and availability has been carried out. Analytical comparisons presented in terms of availability, mean time to failure, profit function and cost benefits have shown that configuration 3 is the optimal configuration. This is supported by numerical examples in contrast to some studies where the optimal configuration of the system is not uniform as it depends on some system parameters. Graphs and sensitivity analysis presented reveal the analytical results and accomplish that Configuration 3 is the optimal in terms of design, reliability physiognomies such as availability of the system, mean time to failure, profit and cost benefit. The study is beneficial to engineers, system designers, reliability personnel, maintenance managers, etc.
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Elleuch, Ines, Fatma Abdelkefi e Mohamed Siala. "Complexity Issues within Eigenvalue-Based Multi-Antenna Spectrum Sensing". In Advances in Wireless Technologies and Telecommunication, 603–17. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6571-2.ch023.
Testo completoAbstract (sommario):
This chapter provides a deep insight into multiple antenna eigenvalue-based spectrum sensing algorithms from a complexity perspective. A review of eigenvalue-based spectrum-sensing algorithms is provided. The chapter presents a finite computational complexity analysis in terms of Floating Point Operations (flop) and a comparison of the Maximum-to-Minimum Eigenvalue (MME) detector and a simplified variant of the Multiple Beam forming detector as well as the Approximated MME method. Constant False Alarm Performances (CFAR) are presented to emphasize the complexity-reliability tradeoff within the spectrum-sensing problem, given the strong requirements on the sensing duration and the detection performance.
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Loubna, Bouakkar, Ameddah Hacene e Mazouz Hammoud. "A Particle Swarm Optimization-Based Approach for Finding Reliability in a Total Hip Prosthesis". In Artificial Neural Network Applications in Business and Engineering, 222–42. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-3238-6.ch010.
Testo completoAbstract (sommario):
Nowadays, we assist the global extension of reliability optimization problems from the design phase of systems and sub-systems to the design and operational phases, not only of systems and sub-systems, but also of bio functionality design. This chapter investigates the relative performances of particle swarm optimization (PSO) variants when used to find reliability in the total hip prosthesis by finding the maximization of jumping distance (JD) to avoid dislocation and the minimization of system's stability to offer mobility. Statistical analysis of different cases of head diameters of 22, 28, 36, 40 mm has been conducted to survey the convergence and relative performances of the main PSO variants when applied to solve reliability in the total hip prosthesis.
Atti di convegni sul tema "MmW reliability"
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Ighilahriz, S., F. Cacho, V. Huard, L. Moquillon, P. Benech e J. M. Fournier. "HBT reliability modeling strategy for BICMOS RF and mmW applications". In 2012 IEEE International Integrated Reliability Workshop (IIRW). IEEE, 2012. http://dx.doi.org/10.1109/iirw.2012.6468931.
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Cressler, John D. "New Developments in SiGe HBT Reliability for RF Through mmW Circuits". In 2021 IEEE International Reliability Physics Symposium (IRPS). IEEE, 2021. http://dx.doi.org/10.1109/irps46558.2021.9405171.
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Ighilahriz, S., F. Cacho, L. Moquillon, S. Razafimandimby, F. Blanchet, J. Morelle, N. Corrao et al. "Reliability study under DC stress on mmW LNA, Mixer and VCO". In 2012 IEEE International Reliability Physics Symposium (IRPS). IEEE, 2012. http://dx.doi.org/10.1109/irps.2012.6241889.
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Ganguly, Satyaki, Kyle M. Bothe, Alexandre Niyonzima, Thomas Smith, Yueying Liu, Jeremy Fisher, Fabian Radulescu et al. "DC and RF Reliability Assessment of 5G-MMW capable GaN HEMT Process (Invited)". In 2022 IEEE International Reliability Physics Symposium (IRPS). IEEE, 2022. http://dx.doi.org/10.1109/irps48227.2022.9764539.
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Divay, A., C. Dehos, I. Charlet, F. Gaillard, B. Duriez, X. Garros, J. Antonijevic et al. "A Methodology to Address RF Aging of 40nm CMOS PA Cells Under 5G mmW Modulation Profiles". In 2024 IEEE International Reliability Physics Symposium (IRPS). IEEE, 2024. http://dx.doi.org/10.1109/irps48228.2024.10529462.
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Liu, Yixuan, Chen Jiang, Zhen Hu, Zissimos P. Mourelatos, Yan Fu, David Gorsich, Paramsothy Jayakumar e Monica Majcher. "Mission Mobility Reliability Analysis of Off-Road Ground Vehicles". In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22201.
Testo completoAbstract (sommario):
Abstract The NATO Reference Mobility Model (NRMM) has been developed to predict the mobility of off-road ground vehicles based on modeling and simulation (M&S). Due to various uncertainty sources in the M&S, uncertainty is inherent in the vehicle mobility. Aims to account for the uncertainty in the mobility prediction in mission planning, this paper develops a simulation-based mission mobility reliability analysis framework for off-road ground vehicles. A concept of mission mobility reliability (MMR) is first proposed to quantify the reliability of a mission path which passes through different types of soils. A single-loop Kriging surrogate modeling method is then employed to overcome the challenge in the mission mobility reliability assessment caused by the computationally expensive mobility simulation. Built upon the surrogate model-based mission mobility reliability analysis, a dynamic updating scheme is proposed to update the MMR estimation based on the on-line mobility data, during the course of a specific mission and for a particular vehicle. The online dynamic updating of MMR allows for effective and dynamic decision making during the mission phase. A case study is used to demonstrate the effectiveness of the proposed MMR analysis and updating framework.
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Jiang, Chen, Yixuan Liu, Zhen Hu, Zissimos P. Mourelatos, David Gorsich e Yan Fu. "Reliability-Based Mission Planning of Off-Road Autonomous Ground Vehicles Using an Outcrossing Approach". In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-67887.
Testo completoAbstract (sommario):
Abstract Reliability-based mission planning aims to identify an optimal path for off-road autonomous ground vehicles (AGVs) under uncertain terrain environment, while satisfying specific mission mobility reliability (MMR) constraints. The evaluation of MMR during path planning poses computational challenges for practical applications. This paper presents an efficient reliability-based mission planning using an outcrossing approach that has the same computational complexity as deterministic mission planning. A Gaussian random field is employed to represent the spatially dependent uncertainty sources in the terrain environment. The latter are then used in conjunction with a vehicle mobility model to generate a stochastic mobility map. Based on the stochastic mobility map, outcrossing rate maps are generated using the outcrossing concept which is widely used in time-dependent reliability. Integration of the outcrossing rate map with a rapidly-exploring random tree (RRT*) algorithm, allows for efficient path planning of AGVs subject to MMR constraints. A reliable RRT* algorithm using the outcrossing approach (RRT*-OC) is developed to implement the proposed efficient reliability-based mission planning. Results of a case study verify the accuracy and efficiency of the proposed algorithm.
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Alharbi, Mohammed, Semih Isik e Subhashish Bhattacharya. "Reliability Comparison and Evaluation of MMC Based HVDC Systems". In 2018 IEEE Electronic Power Grid (eGrid). IEEE, 2018. http://dx.doi.org/10.1109/egrid.2018.8598662.
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Khristodulo, Olga, Vladimir Gvozdev, Oxana Bezhaeva e Marat Shamsutdinov. "Assessment of the characteristics of the municipal solid waste management system based on the apparatus of the theory of reliability". In International Conference "Computing for Physics and Technology - CPT2020". Bryansk State Technical University, 2020. http://dx.doi.org/10.30987/conferencearticle_5fce277281cca9.86270786.
Testo completoAbstract (sommario):
Currently, the problem of organizing a municipal solid waste management system (MSW) has become more acute in Russian regions and all over the world. Various environmental and economic problems, as well as problems related to public health negatively affect many aspects of the development of modern society. Therefore, the careful organization of the management of the MSW management system is of great social importance and needs constant improvement.
In this paper, we look at the MSW management system from the point of various scientific approaches, namely, structural analysis methods, geoinformation technology methods, reliability theory for complex technical systems, evergetics, graph theory and fuzzy logic methods, including the apparatus of linguistic variables. The purpose of the work is to show the possibility of application and systematic combination of the above scientific methods that have proven themselves well in their fields to a new area of the MSW management systems. However, just application of these approaches is impossible without their further adaptation and systematization from the point of view of existing approaches to the management of similar systems.
As part of this study, elements of the MSW management system were identified and a topological model of the system was developed. Structural-logical models of reliability at various levels of abstraction were also built.
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Miranda, E. "Reliability, degradation and breakdown of advanced gate stacks". In 2010 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves (MSMW). IEEE, 2010. http://dx.doi.org/10.1109/msmw.2010.5545996.
Testo completoRapporti di organizzazioni sul tema "MmW reliability"
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Foster, Michelle. Reliability & Maintainability MMWG LANL’s LANSCE (Los Alamos Neutron Science Center) Wireless Vibration Sensor Install Progress. Office of Scientific and Technical Information (OSTI), febbraio 2024. http://dx.doi.org/10.2172/2315687.
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Loutan, Clyde, Peter Klauer, Sirajul Chowdhury, Stephen Hall, Mahesh Morjaria, Vladimir Chadliev, Nick Milam, Christopher Milan e Vahan Gevorgian. Demonstration of Essential Reliability Services by a 300-MW Solar Photovoltaic Power Plant. Office of Scientific and Technical Information (OSTI), marzo 2017. http://dx.doi.org/10.2172/1349211.
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Wall e Lee. PR-398-133725-R01 Large Standoff Magnetometry Techniques for Above the Pipe Integrity Assessment. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), luglio 2014. http://dx.doi.org/10.55274/r0010836.
Testo completoAbstract (sommario):
The project is part of the PRCI research program on above the pipe NDE methods. The scope is as follows:� initial phase assessment of received data sets (up to 20 in total) from PRCI members; agree with PRCI the extent of analysis required; obtain and review data sets and report where possible knowledge gaps. Establish contacts with technology suppliers, end users, partners, etc.; perform analysis of data to identify reliability (POD), correct calls, misses, false calls, etc.; and summarizes findings in a report for PRCI. In total more than 70 individual LSM datasets have been reviewed and analysed, from data provided from 5 separate companies and comprising LSM trial data from pipeline and in-plant inspections by 18 companies using MTM, SCT, and MMM. The length inspected in individual datasets varies from several hundred feet of in-plant pipework many to miles of pipeline segments.
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Hughes, Scott. Cooperation Reliability Testing of the Clipper Windpower Liberty 2.5 MW Turbine: Cooperative Research and Development Final Report, CRADA Number CRD-07-210. Office of Scientific and Technical Information (OSTI), maggio 2012. http://dx.doi.org/10.2172/1040936.
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Spencer. PR-185-084501-R01 Technologies and Methodology for Automated Ultrasonic Testing Systems Quantification. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), aprile 2011. http://dx.doi.org/10.55274/r0010725.
Testo completoAbstract (sommario):
For automated ultrasonic testing (AUT) detection and sizing accuracy, this program developed a methodology for quantification of AUT systems, advancing and quantifying AUT systems image-capture capabilities, quantifying the performance of multiple AUT systems, establishing a guidance document, conducting field tests, and delivering a guidance document for future inclusion in reliability-based design and assessment (RBDA) standards. Improvements for AUT of pipeline girth welds were identified by investigating: imaging techniques for AUT data, modeling and simulation tools for AUT technique development and validation, and quantification methodologies for measuring the performance of AUT systems. Throughout the course of the project, many AUT scans were conducted using both zonal and non-zonal inspection techniques. The quantification methodology provides guidance for quantifying the performance of AUT systems with respect to probability of detection (POD) and accuracy of flaw sizing. Field trials and lab trials demonstrated that a sector sweep of beam angles provides alternative imaging capabilities that may enhance current zonal techniques. Current methodologies used for quantifying detection and sizing limits for AUT systems vary and produce great variability in detection and sizing results. Consequently, a standardized quantification approach is recommended to reduce this variability. This investigation evaluated six AUT systems; flaw heights were detected between 2 and 4 mm with a 90% probability and a confidence level of 95% (a90/95). The use of ultrasonic modeling and inspection simulation software provided a good tool for developing and evaluating AUT procedures; and can be used to evaluate changes in essential variables.
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Warrick, Arthur, Uri Shani, Dani Or e Muluneh Yitayew. In situ Evaluation of Unsaturated Hydraulic Properties Using Subsurface Points. United States Department of Agriculture, ottobre 1999. http://dx.doi.org/10.32747/1999.7570566.bard.
Testo completoAbstract (sommario):
The primary information for accurately predicting water and solute movement and their impact on water quality is the characterization of soil hydraulic properties. This project was designed to develop methods for rapid and reliable estimates of unsaturated hydraulic properties of the soil. Particularly, in situ methodology is put forth, based on subsurface point sources. Devices were designed to allow introduction of water in subsurface settings at constant negative heads. The ability to operate at a negative head allows a direct method of finding unsaturated soil properties and a mechanism for eliminating extremely rapid preferential flow from the slow matrix flow. The project included field, laboratory and modeling components. By coupling the measurements and the modeling together, a wider range of designs can be examined, while at the same time realistic performance is assured. The developed methodology greatly expands the possibilities for evaluating hydraulic properties in place, especially for measurements in undisturbed soil within plant rooting zones. The objectives of the project were (i) To develop methods for obtaining rapid and reliable estimates of unsaturated hydraulic properties in situ, based on water distribution from subsurface point sources. These can be operated with a constant flow or at a constant head; (ii) To develop methods for distinguishing between matrix and preferential flow using cavities/permeameters under tension; (iii) To evaluate auxiliary measurements such as soil water content or tensions near the operating cavities to improve reliability of results; and (iv: To develop numerical and analytical models for obtaining soil hydraulic properties based on measurements from buried-cavity sources and the auxiliary measurements. The project began in July 1995 and was terminated in November 1998. All of the objectives were pursued. Three new subsurface point sources were designed and tested and two old types were also used. Two of the three new designs used a nylon cloth membrane (30 mm) arranged in a cylindrical geometry and operating at a negative water pressure (tension). A separate bladder arrangement allowed inflation under a positive pressure to maintain contact between the membrane and the soil cavity. The third new design used porous stainless steel (0.5 and 5 mm) arranged in six segments, each with its own water inlet, assembled to form a cylindrical supply surface when inflated in a borehole. The "old" types included an "off-the-shelf" porous cup as well as measurements from a subsurface drip emitter in a small subsurface cavity. Reasonable measurements were made with all systems. Sustained use of the cloth membrane devices were difficult because of leaks and plugging problems. All of the devices require careful consideration to assure contact with the soil system. Steady flow was established which simplified the analysis (except for the drip emitter which used a transient analysis).