Готові списки джерел за темами / Unbalanced shaft

Добірка наукової літератури з теми "Unbalanced shaft"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Unbalanced shaft"

1

Masrol, S. R., M. A. Madlan, Salihatun Md Salleh, Maznan Ismon, and Mohd Nazrul Roslan. "Vibration Analysis of Unbalanced and Misaligned Rotor System Using Laser Vibrometer." Applied Mechanics and Materials 315 (April 2013): 681–85. http://dx.doi.org/10.4028/www.scientific.net/amm.315.681.

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Анотація:
Rotor unbalance and shaft misalignment are common major concerns in rotating system. In this study, vibration analysis for unbalanced rotor and misaligned shaft components using non-contact laser Doppler vibrometer (LDV) were examined. The vibration acceleration magnitude (m/s2) and FFT spectrum from the both fault detections were recorded by the portable laser Doppler vibrometer and analysed by the vibration analysis software. The result shows that combination of unbalance and parallel misalignment fault conditions can produce higher vibration thus reduce the life span of the rotor system. In this case, the unbalance fault condition combined with parallel misaligned rotor gave highest vibration magnitude followed by simply unbalanced rotor and parallel misalignment fault only. This experiment shows that the non-contact method has successfully detected the unbalance and parallel misalignment fault in the rotor system.
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2

Zhyhylii, Serhii, Maksym Kharchenko, and Julia Katella. "Mathematical Model of the Dynamic Action of the Controlled Vibration Exciter on the Processed Medium of Mixer with Toroidal Working Container." International Journal of Engineering & Technology 7, no. 3.2 (June 20, 2018): 478. http://dx.doi.org/10.14419/ijet.v7i3.2.14576.

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Анотація:
Vibration mixers are technological machines that are meant for mixing of different processed medium. A driving force in such machines is realizing by oscillation exciter. In this article, the constructive scheme of the vibration mixer is introduced. Such a mixer has the toroidal working container and is equipped with controlled mechanical centrifugal unbalanced exciters of oscillations with a vertically located unbalanced shaft. The work principle of one of the possible configurations in this exciter is considered and provided. One inflexible and two mobile unbalances are strengthen on its unbalanced shaft. The mobile unbalances by means of independent external action, that is caused by mechanism for managing of mobile unbalances, have an opportunity to change synchronously its positions on the unbalanced shaft directly in time of mixer’s work. The centrifugal inertia forces of inflexible and mobile unbalances make the dynamic wrench that consists of the main vector and the main moment and rotates with unbalanced shaft. It is determined that the value of the main vector and the main moment evaluate the dynamic action of this vibration exciter to the mixer’s working container. The mathematical model of the dynamic action of oscillator exciter on the processed medium of mixer with the toroidal working container is received. Depending on the value of turn angle of mobile unbalances from its starting positions exciter: a) staying in the dynamic balance state; b) is generating the translation force field; c) generates the wrench force field of this or that direction. These opportunities of controlled vibration exciter firmly provide anfractuous circulative motion of the processed medium on the volume of the mixer’s working container. Using of controlled exciter also leaves out the transfers through intermediate resonance frequencies. As its starting and stopping happen in a dynamic balance state, so it leaves out the possibility of manifestation of the “Sommerfeld’s effect” that is harmful for the driven motor, improves the constructive availability of the vibration mixer and increases its efficiency and life duration.
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3

Huang, Kang, Ge Chen, Qi Chen, and Zu Fang Zhang. "Dynamic Balance Analysis of Automobile Drive Shaft Based on Solidworks." Applied Mechanics and Materials 215-216 (November 2012): 986–91. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.986.

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Анотація:
In this paper, drive shaft’s dynamic unbalance was calculated based on dynamic theory. The results were presented drive shaft’s dynamic balancing can be assessed by detecting the value of the unbalanced force at both ends of drive shaft. Here solidworks software was used to make an error modelling on the drive shaft. Simulation module is also applied to analyze the model. The results show the tube straightness, yoke thickness difference of flange yoke and symmetrical error of cardan shaft influence dynamic balance of drive shaft. The above findings have a guiding role in the practical production.
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4

Hashimoto, H., and S. Wada. "Dynamic Behavior of Unbalanced Rigid Shaft Supported on Turbulent Journal Bearings—Theory and Experiment." Journal of Tribology 112, no. 2 (April 1, 1990): 404–8. http://dx.doi.org/10.1115/1.2920271.

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Анотація:
In this paper, the combined effects of turbulence and fluid film inertia on the dynamic behavior of an unbalanced rigid shaft supported horizontally on two identical aligned short journal bearings are investigated theoretically and experimentally. Utilizing analytical expressions for the dynamic fluid film force components considering the effects of turbulence and fluid film inertia, the nonlinear equations of motion for the rotor-bearing systems are solved by the improved Euler’s forward integration method. The journal center trajectories with unbalance eccentricity ratio of εμ = 0, 0.1 and 0.2 are examined theoretically for Reynolds number of Re = 2750, 4580, and 5500, and the theoretical results are compared with experimental results. From the theoretical and experimental results, it was found that the fluid film inertia improves the stability of unbalanced rigid shaft under certain operating conditions.
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5

Al-Falahat, Ala’a M. "Implementation of the dynamic balancing approach of a rotating composite hollow shaft." EUREKA: Physics and Engineering, no. 2 (March 31, 2022): 68–73. http://dx.doi.org/10.21303/2461-4262.2022.002336.

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Анотація:
Balancing is essential in rotating machinery, which is widely employed in many technical sectors, particularly in high-speed rotor-bearing systems. The mass balancing method of the hollow shaft manufactured of composite materials is investigated in this study over the whole speed range of the rotor. The main goal of the balancing technique is to generate a smooth-running machine by removing the commonality imbalance mass through the use of compensating mass unbalance. As a result, MATLAB code is created to produce a functioning mathematical model of the rotor-bearing system. The unbalanced rotor-bearing system finite element model is proposed to set the balancing mass of the composite hollow shaft at a selected speed rotor that allows minimizing the vibration response amplitude of the rotor as much as possible with minimal impact on the rest of the imbalance response within the speed range of the interest. As a consequence, this study validates the process for distributing imbalance in modelling balancing to balance the flexible hollow shaft with an unbalanced mass throughout the complete speed range of the shaft. The balance of the hollow shaft at the critical speed was observed in this approach, and the vibration amplitude was determined by adding extra mass at a specific angle
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6

Banakh, Ludmila, and Andrey Nikiforov. "BACKWARD WHIRL OF UNBALANCED SHAFT AT ELASTICALLY CONSTRAINED JOURNAL BEARINGS AND FLOATING SEALS DUE TO MECHANICAL CONTACT." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (August 3, 2015): 234. http://dx.doi.org/10.17770/etr2009vol2.1012.

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Анотація:
The paper deals with the known phenomenon which takes place at rotor-stator contact. It is backward precession (whirl) of unbalanced shaft inside rigidly constrained sleeves (journal bearings) in the range below its critical speed. The purpose of this theoretical work is to research dynamic behavior of unbalanced shaft at the elastically constrained sleeves and above-resonant range.
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7

Liu, Zhanhui, Jianbin Luo, Jing Yu Liu, Yibing Lu, and Yu Jie Guo. "Low Pressure Shaft’s Bear Vibration Treatment for a Supercritical Turbine." Advanced Materials Research 614-615 (December 2012): 446–51. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.446.

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Анотація:
The supercritical turbine, changed low pressure rotor’s blade in site, bear vibration over-proof seriously because of unbalance, reached rated speed after dynamic balance in site. The vibration of low pressure Ⅱshaft’s bear was still over-proof. And the bear vibration phase was anti-phase with the shaft vibration not only anti-phase but also in-phase. It was found that the bear vibration was highly related with the anti-phase component of shaft vibration after running date analysis. And the bear vibration was reduced obviously after the anti-phase component of shaft’s residual unbalanced mass reduced by dynamic balance in site.
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8

Huang, Ziyuan, Jiancheng Fang, and Kun Wang. "Dynamics of flexible rotor-shaft assembly with consideration of contact behaviors." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 5 (June 12, 2014): 859–68. http://dx.doi.org/10.1177/0954406214539470.

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Анотація:
An approach is presented for large error problems of modal analysis of shaft assembly by considering contact behaviors of shaft components. The interference of shaft assembly is firstly calculated analytically through contact theory. The modal analysis of the finite element (FE) model of rotor-shaft assembly is executed by optimizing the normal contact stiffness factor (FKN). The accuracy of simulation results is verified in good agreement with experimental modal testing. The percentage errors of the first two bending natural frequencies are 1.3% and 2.8%, respectively. It is demonstrated that accurate mode of rotor-shaft assembly can be achieved. Then critical speeds of forward and backward are obtained by Campbell diagram. In particular, the amplitude-frequency response of rotor different element node under unbalanced vibration force is obtained by unbalance response analysis. It is important to improve the assembly’s structural integrity in order to minimize operational failure.
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9

Yang, S. M., and G. J. Sheu. "Vibration Control of a Rotating Shaft: An Analytical Solution." Journal of Applied Mechanics 66, no. 1 (March 1, 1999): 254–59. http://dx.doi.org/10.1115/1.2789155.

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Анотація:
It has been shown that a rotating shaft in the Rayleigh beam model has only a finite number of whirl speeds and vibration modes when the rotating speed is higher than half of the whirl speed. The system’s unbalanced response can therefore be written analytically by the vibration modes and the generalized coordinates. This paper presents an analytical controller design of optimal sensor/actuator location and feedback gain for minimizing the steady-state unbalanced response. Because all of the critical speeds and vibration modes are included in the controller design, there will be no residual mode, hence no spillover. An example is used to illustrate that the controller design in collocated or noncollocated configuration not only guarantees the closed-loop stability but also effectively suppresses the unbalanced response.
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10

Izanlo, Ali, Asghar Gholamian, and Mohammad Verij kazemi. "DIRECT POWER CONTROL OF A DFIG BASED WIND TURBINS UNDER UNBALANCED GRID VOLTAGE WITHOUT ROTOR POSITION SENSOR." IIUM Engineering Journal 18, no. 1 (May 30, 2017): 57–71. http://dx.doi.org/10.31436/iiumej.v18i1.676.

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Анотація:
In this paper, the behavior of a doubly fed induction generator (DFIG) is proposed under unbalanced grid voltage and without using a rotor position sensor. There are two main methods that are been used for the detection of rotor position: using shaft sensor and sensorless algorithm. In this paper the shaft sensor is eliminated and a position sensorless algorithm is used for estimating the rotor position. Sensorless operation is more desirable than using shaft sensor, because the shaft sensor has several disadvantages related to the cost, cabling, robustness and maintenance. Also, during network unbalance, three selectable control targets are identified for the rotor side converter (RSC), i.e., obtaining sinusoidal and symmetrical stator currents, mitigation of active and reactive powers ripples and the cancellation of electromagnetic torque oscillations. The effectiveness of the proposed control strategy is confirmed by the simulation results from a 2-MW DFIG system. It is concluded that the sensorless algorithm is able to produce accurate results similar to the case of that used from shaft sensor and it can be used in the practical applications.
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Більше джерел

Дисертації з теми "Unbalanced shaft"

1

Катаєв, Вадим Сергійович. "Грохот колосниковий з модернізацією дебалансного валу". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/28405.

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Анотація:
Пояснювальна записка складається з технологічної частини, параметричних, кінематичних та розрахунків на міцність, технології машинобудування та розділу охорони праці. Предметом дослідження був колосниковий грохот для механічного сортування матеріалу та модернізація дебалансного валу. Вивчено принцип роботи і конструкцію колосникових грохотів, виконано розрахунки, необхідні для модернізації колосникового грохоту. Модернізовано дебалансний вал, проведено розрахунки, що підтверджують працездатність модернізованої конструкції, в тому числі за допомогою ЕОМ.
The explanatory note consists of a technological part, parametric, kinematic and strength calculations, technology engineering and occupational safety. The subject of the study was a grate rocket for mechanical sorting of the material and the upgrading of the unbalanced shaft. The principle of work and construction of grate craters was studied, the calculations necessary for the modernization of the grate crash were performed. The unbalanced shaft has been upgraded, calculations have been made, confirming the efficiency of the modernized design, including using a computer.
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2

Meszaros, Christopher, and Fabian Wärn. "Anomaly Detection for Machine Diagnostics : Using Machine learning approach to detect motor faults." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Datateknik och informatik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-43695.

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Анотація:
Machine diagnostics is usually done via conditioned monitoring (CM). This approach analyses certain thresholds or patterns for diagnostic purposes. This approach can be costly and time consuming for industries. A larger downside is the difficulty in generalizing CM to a wider set of machines.There is a new trend of using a Machine learning (ML) approach to diagnose machines states. An ML approach would implement an autonomous system for diagnosing machines. It is highly desirable within industry to replace the manual labor performed when setting up CBM systems. Often the ML algorithms chosen are novelty/anomaly based. It is a popular hypothesis that detecting anomalous measurements from a system is a natural byproduct of a machine in a faulty state.The purpose of this thesis is to help CombiQ with an implementation strategy for a fault detection system. The idea of the fault detection system is to make prediction outcomes for machines within the system. More specifically, the prediction will inform whether a machine is in a faulty state or a normal state. An ML approach will be implemented to predict anomalous measurements that corresponds to a faulty state. The system will have no previous data on the machines. However, data for a machine will be acquired once sensors (designed by CombiQ) have been set up for the machine.The results of the thesis proposes an unsupervised and semi-supervised approach for creating the ML models used for the fault detection system. The unsupervised approach will rely on assumptions when selecting the hyperparameters for the ML. The semi-supervised approach will try to learn the hyperparameters through cross validation and grid search. An experiment was set up check whether three ML algorithms can learn optimal hyperparameter values for predicting rotational unbalance. The algorithm known as OneClassVM showed the best precision results and hence proved more useful for CombiQ’s criterium.
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3

Tsener, Inna. "Numerical methods for analyzing nonstationary dynamic economic models and their applications." Doctoral thesis, Universidad de Alicante, 2015. http://hdl.handle.net/10045/50216.

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4

Park, Gil-Hwan. "Economic and Social Networks: Impacts on Regional Economic Outcomes and Concentrations." Cleveland, Ohio : Cleveland State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1264534311.

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Анотація:
Thesis (Ph.D.)--Cleveland State University, 2009.
Abstract. Title from PDF t.p. (viewed on Jan. 27, 2010). Includes bibliographical references (p. 185-203). Available online via the OhioLINK ETD Center and also available in print.
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5

Hsu, Ming-Wei, and 徐銘韋. "A Fast Fault Diagnosis Technique for Unknown Locations of Shaft-Bow and Unbalance." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/14770634628095776944.

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Анотація:
碩士
元智大學
機械工程學系
97
Large rotating machines, like gas turbines and steam turbines of power plants, may suffer from the faults of unbalance, caused by erosion and deposition on blades, and shaft bow, caused by manufacturing tolerance or defects, sagging due to gravity or uneven thermal distribution. These faults, unbalance and shaft bow, are difficult to distinguish because they may be distributed over multiple locations and developed gradually during the long-term period of operation. A fast fault diagnostic method is proposed to identify the locations and amounts of faults based on the vibration responses of the rotor, without prior knowledge of the numbers and locations of the faults. Previous diagnosis methods require vibration responses of rotors at low and high rotating speeds to distinguish the faults of shaft bow and unbalance while only the vibration responses of the rotor at a fixed rotating speed is needed in the proposed method. Most diagnosis methods identify the faults of known numbers and locations, while the propose method can identify the faults under the conditions of not knowing the numbers and locations of the faults in advance. Compared with other fault diagnosis methods that search all the possible locations of faults and consume large computation, the proposed method achieves fast diagnosis by orderly searching the possible locations of faults and computing far less than other methods. Based on the above advantages, the proposed method is suitable for the online diagnosis and monitoring of large rotating machinery of fixedly rotating speeds, like steam turbine-generators of power plants, to monitor the health conditions of the machines.
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6

"Power System Dynamics Enhancement Through Phase Unbalanced and Adaptive Control Schemes in Series FACTS devices." Thesis, 2012. http://hdl.handle.net/10388/ETD-2012-04-423.

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Анотація:
This thesis presents novel series compensation schemes and adaptive control techniques to enhance power system dynamics through damping Subsynchronous Resonance (SSR) and low-frequency power oscillations: local and inter-area oscillations. Series capacitive compensation of transmission lines is used to improve power transfer capability of the transmission line and is economical compared to the addition of new lines. However, one of the impeding factors for the increased utilization of series capacitive compensation is the potential risk of SSR, where electrical energy is exchanged with turbine-generator shaft systems in a growing manner which can result in shaft damage. Furthermore, the fixed capacitor does not provide controllable reactance and does not aid in the low-frequency oscillations damping. The Flexible AC Transmission System (FACTS) controllers have the flexibility of controlling both real and reactive power which could provide an excellent capability for improving power system dynamics. Several studies have investigated the potential of using this capability in mitigating the low-frequency (electromechanical) as well as the subsynchronous resonance (SSR) oscillations. However, the practical implementations of FACTS devices are very limited due to their high cost. To address this issue, this thesis proposes a new series capacitive compensation concept capable of enhancing power system dynamics. The idea behind the concept is a series capacitive compensation which provides balanced compensation at the power frequency while it provides phase unbalance at other frequencies of oscillations. The compensation scheme is a combination of a single-phase Thyristor Controlled Series Capacitor (TCSC) or Static Synchronous Series Compensator (SSSC) and a fixed series capacitors in series in one phase of the compensated transmission line and fixed capacitors on the other two phases. The proposed scheme is economical compared to a full three-phase FACTS counterpart and improves reliability of the device by reducing number of switching components. The phase unbalance during transients reduces the coupling strength between the mechanical and the electrical system at asynchronous oscillations, thus suppressing the build-up of torsional stresses on the generator shaft systems. The SSR oscillations damping capability of the schemes is validated through detailed time-domain electromagnetic transient simulation studies on the IEEE first and second benchmark models. Furthermore, as the proposed schemes provide controllable reactance through TCSC or SSSC, the supplementary controllers can be implemented to damp low-frequency power oscillations as well. The low-frequency damping capability of the schemes is validated through detail time-domain electromagnetic transient simulation studies on two machines systems connected to a very large system and a three-area, six-machine power system. The simulation studies are carried out using commercially available electromagnetic transient simulation tools (EMTP-RV and PSCAD/EMTDC). An adaptive controller consisting of a robust on-line identifier, namely a robust Recursive Least Square (RLS), and a Pole-Shift (PS) controller is also proposed to provide optimal damping over a wide range of power system operations. The proposed identifier penalizes large estimated errors and smooth-out the change in parameters during large power system disturbances. The PS control is ideal for its robustness and stability conditions. The combination results in a computationally efficient estimator and a controller suitable for optimal control over wider range of operations of a non-linear system such as power system. The most important aspect of the controller is that it can be designed with an approximate linearized model of the complete power system, and does not need to be re-tuned after it is commissioned. The damping capability of such controller is demonstrated through detail studies on a three-area test system and on an IEEE 12-bus test system. Finally, the adaptive control algorithm is developed on a Digital Signal Processing Board, and the performance is experimentally tested using hardware-in-the-loop studies. For this purpose, a Real Time Digital Simulator (RTDS) is used, which is capable of simulating power system in real-time at 50 µs simulation time step. The RTDS facilitates the performance evaluation of a controller just like testing on a real power system. The experimental results match closely with the simulation results; which demonstrated the practical applicability of the adaptive controller in power systems. The proposed controller is computationally efficient and simple to implement in DSP hardware.
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7

Rodrigues, Ana Maria da Cunha. "Desenvolvimento do conversor CC-CA trifásico de um sistema de advanced load-shift." Master's thesis, 2019. http://hdl.handle.net/1822/64778.

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Анотація:
Dissertação de mestrado em Engenharia Eletrónica e de Computadores
Devido à previsível escassez e às desvantagens inerentes ao uso de combustíveis fósseis na produção de energia elétrica, tem-se vindo a apostar em fontes de energia renovável, nomeadamente a eólica e a solar fotovoltaica. Contudo, estes tipos de fontes apresentam como principais desvantagens a intermitência na produção de energia, bem como a necessidade de um equipamento de interface com a rede elétrica, que tipicamente introduz problemas de qualidade de energia elétrica (QEE). Assim, de forma a possibilitar a integração de fontes de energia renovável na rede elétrica e explorar os incentivos referentes aos períodos de menor procura de energia, surgem novas oportunidades relativamente aos sistemas de armazenamento e gestão de energia, nomeadamente, o conceito de load shifting. Neste sentido, a presente dissertação de mestrado encontra-se inserida no desenvolvimento de um sistema de load-shift com características avançadas. Este dispositivo permite a interface de um sistema de armazenamento de energia com a rede elétrica, simultaneamente com a compensação de problemas de qualidade de energia elétrica relacionados com a corrente, nomeadamente, harmónicos, desequilíbrios e potência reativa. Nesta dissertação é abordado o desenvolvimento do conversor CC-CA trifásico, responsável pela interface com a rede elétrica, absorvendo ou injetando energia elétrica, dependendo do modo de operação do sistema de armazenamento. Além disso, este conversor CC-CA permite a operação como filtro ativo paralelo (FAP) trifásico, sendo esta uma das principais contribuições para a operação do sistema. Ao longo do desenvolvimento desta dissertação, foi possível validar a topologia de conversor CC-CA trifásico com quatro braços a operar em diferentes modos, bem como o seu sistema de controlo. Estes modos envolveram um estudo teórico necessário à execução dos testes de simulação e validação experimental do desempenho do sistema implementado.
Recently, there has been a focus on renewable energy sources, namely wind and solar photovoltaic, due to the predictable scarcity and inherent drawbacks of the use of fossil fuels in the production of electric energy. However, these types of energy sources have their own shortcomings: the intermittence of energy production as well as the need for an electrical network interface device that typically introduces power quality (PQ) problems. Thus, to allow the integration of renewable energy sources in the grid and to explore the incentives for periods of lower energy demand, new opportunities arise regarding energy storage and management systems, namely the load shifting concept. In this context, the present master dissertation is focused on developing a system of load-shift with advanced characteristics. This device allows the interface of a system of energy storage with the electric network, while fixing the electrical power quality problems related to current harmonics, unbalances and reactive power. This investigation discusses the development of three-phase DC-AC converter, which is responsible for interfacing with the grid, absorbing or injecting electrical energy, depending on the mode of operation of the storage system. Additionally, one of the main contributions to the system operation is that the DC-AC converter allows operation as a three-phase shunt active filter (APF). Throughout the development of this dissertation, it was possible to validate the topology of the three-phase DC-AC converter with four legs operating in different modes, as well as its control system. These modes involved a theoretical study, which is necessary to perform the simulation tests and experimental validation of the performance of the implemented system.
Este trabalho de mestrado está enquadrado no projeto de IC&DT “Quality4Power - Enhancing the Power Quality for Industry 4.0 in the era of Microgrids”, financiado pela Fundação para a Ciência e Tecnologia, com a referência PTDC/EEI-EEE/28813/2017.
Este trabalho de mestrado está enquadrado no projeto de IC&DT “newERA4GRIDs – New Generation of Unified Power Conditioner with Advanced Control, Integrating Electric Mobility, Renewables, and Active Filtering Capabilities for the Power Grid Improvement”, financiado pela Fundação para a Ciência e Tecnologia, com a referência POCI-01-0145-FEDER-030283.
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8

安田, 仁彦, 建瑞 叶 та 恵輔 神谷. "回転軸系の時間領域実験的同定法の開発とその応用に関する研究". 2000. http://hdl.handle.net/2237/12876.

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Книги з теми "Unbalanced shaft"

1

Münch, Ursula, Ralph Mocikat, Siegfried Gehrmann, and Jörg Siegmund, eds. Die Sprache von Forschung und Lehre. Nomos Verlagsgesellschaft mbH & Co. KG, 2020. http://dx.doi.org/10.5771/9783748902270.

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Анотація:
International academic work teaches cultural tolerance, intellectual openness and curiosity in a particular way. It is undeniable that academia benefits from multilingual intercultural exchange. Nevertheless, as a lingua franca, English has dominated almost all strategically important areas of social thinking and behaviour for quite some time. Even in academia, other languages have disappeared from numerous disciplines. This unbalanced shift towards the English language may not only offer important opportunities, but could also pose considerable risks, among which are the limited acquisition of knowledge, reduced academic exchange, curtailed knowledge sharing in society and the promotion of purely market-oriented research interests. Against this background, this anthology addresses the question of whether and to what extent the growing dominance of business concepts in academia is related to the standardisation of academic expression and communication.
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Частини книг з теми "Unbalanced shaft"

1

Muñoz-Abella, B., L. Rubio, and P. Rubio. "Study of the Stress Intensity Factor of an Unbalanced Rotating Cracked Shaft." In New Advances in Mechanisms, Transmissions and Applications, 401–8. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-7485-8_49.

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2

Yan, Shuiping, and Roland Sievert. "Vibration Sensitivity of Large Turbine Generator Shaft Trains to Unbalance." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 3–14. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_1.

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3

Strzelecki, Stanislaw, and Z. Towarek. "Effect of Shaft Unbalance on the Operation of Worm Gear Rolling Bearings." In Damage Assessment of Structures VI, 441–50. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-976-8.441.

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4

Phadatare, Hanmant P., Sankalp Singh, and Barun Pratiher. "Effect of Unbalance with Bearing Flexibility on Vibration Phenomenon of Geometrically Nonlinear Rotating Shaft with Ball Bearing." In Lecture Notes in Mechanical Engineering, 1261–76. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0550-5_120.

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5

"CHAPTER FIVE. The "Seamy Side" of the Revolution: The Criminal Element, the Psychologically Unbalanced, and Juveniles." In Thou Shalt Kill, 154–80. Princeton University Press, 1993. http://dx.doi.org/10.1515/9780691221458-008.

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6

Schittenhelm, R. S., Z. Wang, and S. Rinderknecht. "Observer design for rotating shafts excited by unbalance." In 10th International Conference on Vibrations in Rotating Machinery, 357–66. Elsevier, 2012. http://dx.doi.org/10.1533/9780857094537.5.357.

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7

"Appendix E Matlab Code to Evaluate Rotor Shaft Unbalance Effects." In Thermohydrodynamic Instability in Fluid-Film Bearings, 183–91. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9780470059432.app5.

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8

Fedak, Viliam, Pavel Zaskalicky, and Zoltan Gelvanič. "Analysis of Balancing of Unbalanced Rotors and Long Shafts using GUI MATLAB." In MATLAB Applications for the Practical Engineer. InTech, 2014. http://dx.doi.org/10.5772/58378.

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9

Mulgan, Geoff. "Barren and Pregnant Crises." In The Locust and the Bee. Princeton University Press, 2015. http://dx.doi.org/10.23943/princeton/9780691165745.003.0002.

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This chapter describes the crisis that unfolded in the late 2000s, and how it changed the world's political economy. The crisis had its origins, like many others, on the edges of capitalism, in the household sector and land, and in the most dramatically unbalanced parts of the system, before spreading into every other part, freezing the flow of credit in the banks, and then precipitating a cascade of collapses. In retrospect, scholars can now see that the late 1990s brought a historic shift of surpluses away from production and toward finance, which, like any excess of predation, inevitably harmed the vitality of the system being preyed on.
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10

Xiong, Ligui, and Liqiong Zhang. "Research on the Tensile Properties of Packaging Film Based on Environmental Protection PVA-KGM." In Advances in Transdisciplinary Engineering. IOS Press, 2021. http://dx.doi.org/10.3233/atde210330.

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Konjac glucomannan (KGM) and poly (vinyl alcohol) (PVA) were mixed to form gel-like polyelectrolyte solution with glycerol and sorbitol as compound plasticizer, which was used to prepare packaging films via casting and drying. The results show that the tensile strength and elongation at break of the packaging films drop sharply when the blending temperature and blending time exceed 80 °C and 3.5 h. When the mass ratio of sorbitol and glycerol in the compound plasticizer ranges from 1:1 to 1:3, it is beneficial to improve the tensile strength of the packaging films. The microscopic reasons for the change of the tensile properties of the packaging films are mainly caused by diffusion-stop-continuing diffusion—precipitation of low-molecular electrolyte, which makes the system shift from equilibrium-homogeneous state- unbalanced state—heterogeneous state.
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Тези доповідей конференцій з теми "Unbalanced shaft"

1

Fu, Penglei, Baoxiang Qiu, Chao Ding, Bomei Shi, and Yunqing Zhang. "Experimental Study of Unbalanced Multiple Propeller Shaft." In WCX World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2018. http://dx.doi.org/10.4271/2018-01-1398.

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2

Shiau, T. N., C. R. Wang, D. S. Liu, W. C. Wang, and W. C. Hsu. "Dynamic Spur Geared Rotor Analysis of a Multi-Shaft Turbine With Gear Parameters." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43337.

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The dynamic analysis of the multi-shaft turbine rotor equipped with a spur gear pair for the various gear parameters is studied. Main components of the multi-shaft turbine rotor system include the outer shaft, the inner shaft, the impeller shaft, the oil shaft and the ball bearings. The global assumed mode method (GAMM) is applied to model the rotor motion and the system equation of motion is formulated using Lagrange’s approach. The dynamic behavior of the geared multi-shaft turbine rotor system includes the natural frequency, mode shape and unbalanced response. Numerical results show that large vibration amplitude is observed in steady state at self-excited rotating speed adjacent to the natural frequency. There is no influence of the various pressure angle, modulus, and modification coefficients on unbalance response. Contrary to above cases, the variation of the system unbalance response is dominated by the tooth types rather than the other gear parameters.
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3

Upadhyay, S. H., S. C. Jain, and S. P. Harsha. "Vibration Analysis of an Unbalanced Rotating Shaft Due to Ball Waviness." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86272.

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This paper presents an analytical model to investigate the nonlinear dynamic analysis of high speed ball bearings due to ball waviness and unbalanced rotor. The Hertzian contact theory is applied to calculate the elastic deflection and nonlinear contact force, while the rotor has translational and angular motions. In the analytical formulation, the contacts between rolling elements and inner/outer races are considered as nonlinear springs. A nonlinear damping formula, correlating the contact damping force with the equivalent contact stiffness and contact deformation rate is used in the derivation. The numerical integration technique Newmark-β with Newton-Raphson method is used to solve the nonlinear differential equations iteratively. The results are presented in the form of FFTs. The formulation predicts the discrete spectra with specific frequency components for each order of ball waviness. Numerical results obtained from the simulation are validated with respect to those of prior results. Due to an unbalanced rotor, the system is bi-periodically excited. In the vibration spectrum, the peak amplitude of vibrations appears at the wave passage frequency (Nwωroll), rotational frequency (X) and interaction between wave passage and rotational frequencies.
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4

Reda, Kamel, and Yong Yan. "Online continuous detection of an unbalanced metallic shaft using electrostatic sensors." In 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC ). IEEE, 2018. http://dx.doi.org/10.1109/i2mtc.2018.8409679.

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5

Lee, Chong-Won, and Jong-Seok Ham. "Mode Identification for Rotating Rigid Shaft With Flexible Disks by Mode Splits." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8266.

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Abstract This paper investigates the mode splits of the bending coupled modes of a rotating shaft with multiple flexible disks, in which the disks are rigidly attached to the rigid shaft supported by bearings. The bending coupled modes, in which shaft bending modes are coupled with one nodal diameter disk modes, are classified as the balanced and unbalanced modes. The mode splits of the balanced modes are the same as those of pure disk modes since the shaft does not experience any motion. On the other hand, the mode splits between pairs of the forward and backward unbalanced modes are found to be dependent upon the disk/shaft configuration and the shaft support stiffness, as well as the rotational speed and the ratio of polar to diametrical moment of inertia.
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6

Losak, Petr, and Radek Vlach. "Study of the response of the shaft loaded by unbalanced magnetic pull." In 2014 16th International Conference on Mechatronics - Mechatronika (ME). IEEE, 2014. http://dx.doi.org/10.1109/mechatronika.2014.7018239.

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7

Alasty, Aria, and Mohammad Malekian. "Identification of Distributed Unbalanced Mass in Flexible Rotors." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95160.

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This paper presents a new method for identification of distributed unbalanced mass (DUM) of flexible rotors. To this end, a circular section rotor with constant area, distributed parameters, and a spatial distributed unbalanced mass is considered. Rotary inertia and gyroscopic effects are included in the dynamic of system. Then, by measuring the deflection of shaft at some points while rotating in a specific angular speed, an identification method is proposed to obtain the amount of DUM. This information can be used in balancing procedure of the rotor. The method is justified by two numerical simulations.
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8

Petela, G., and K. K. Botros. "Magnetic Bearing Control of Flexible Shaft Vibrations Based on Multiaccess Velocity-Displacement Feedback." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-294.

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A model of the forced vibrations of a flexible, asymmetric and unbalanced shaft, supported by two magnetic bearings is derived to simulate the effect of different schemes of active control on shaft dynamic behaviour. Simulation results were compared for several cases of single and multi-access bearing controls, rigid-body-mode only and rigid with flexible mode control, and linear and non-linear bearing responses. It is shown that the multi-access bearing response calculated from the known equation of the stable ROCL (Reduced Order Closed Loop) and based on the direct velocity-displacement feedback, provided the most precise shift in critical frequencies and also reasonable suppression of shaft vibration amplitudes. The non-linear bearing design was also briefly discussed. The stability analysis showed that stability limits were influenced by more parameters in this case, but no particular advantages were observed in suppression of the vibration amplitudes as compared to the linear case.
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9

Le Lez, Se´bastien, Mihai¨ Arghir, and Jean Frene. "Nonlinear Numerical Prediction of Gas Foil Bearings Stability and Unbalanced Response." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50641.

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One of the main interests of gas foil bearings lies in their superior rotordynamic characteristics compared to conventional bearings. A numerical investigation on the stability limit and on the unbalanced response of foil bearings is presented in this paper. The main difficulty in modeling the dynamic behavior of such bearings comes from the dry friction that occurs within the foil structure. Indeed, dry friction is highly non linear and is strongly influenced by the dynamic amplitude of the pressure field. To deal with these non linearities, a structural dynamic model has been developed in a previous work. This model considers the entire corrugated foil and the interactions between the bumps by describing the foil bearing structure as a multiple degrees of freedom system. It allows the determination of the dynamic friction forces at the top and at the bottom of the bumps by simple integration of ordinary differential equations. The dynamic displacements of the entire corrugated sheet are then easily obtained at each time step. The coupling between this structural model and a gas bearing prediction code is presented in this paper and allows performing full non linear analyses of a complete foil bearing. The bearing stability is the first investigated problem. The results show that the structural deflection enhances the stability of compliant surface bearings compared to rigid ones. Moreover, when friction is introduced, a new level of stability is reached revealing the importance of this dissipation mechanism. The second investigated problem is the unbalanced response of foil bearings. The shaft trajectories depict a non linear jump in the response of both rigid and foil bearings when the value of the unbalance increases. Again, it is evidenced that the foil bearing can support higher mass unbalance before this undesirable step occurs.
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10

Gupta, T. C., K. Gupta, and D. K. Sehgal. "Nonlinear Vibration Analysis of an Unbalanced Flexible Rotor Supported by Ball Bearings With Radial Internal Clearance." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51204.

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In the present work, the nonlinear dynamic response of an unbalanced horizontal flexible rotor supported by deep groove ball bearing is studied. Nonlinearity effects in rolling element bearings arise from Hertzian contact force deformation relationship and clearance between rolling elements and races. The system is bi-periodically excited due to varying compliance of ball bearing and rotating unbalance. The flexible rotor bearing system is modeled by finite element method, taking into account the gyroscopic moments, rotary inertia, shear deformation, proportional damping, nonlinear stiffness and radial internal clearance of ball bearing. The implicit type numerical time integration scheme Newmark-β and Newton-Raphson methods are used to numerically solve the nonlinear equations of motion. The mathematical model is validated for the natural frequencies of the flexible shaft and whirl frequencies. On account of variation in the ball bearing stiffness, the variation in natural frequencies of the rotor ball bearing system is estimated. The influence of ball bearing nonlinearity on dynamic behavior is analyzed by time histories of steady state response, phase portraits and power spectra. Effect of radial internal clearance and varying compliance on the unbalance response of flexible rotor is studied in detail.
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