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Majid Aleyaasin
In this paper, the vibration control of the multivariable model of rotor bearing systems is considered for investigation. Some simply structured controllers that can suppress vibrational disturbances are tested for their robustness via the H8 optimality ...
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Piotr Jan Bielawski
The efficiency and dependability of machine set depends on the quality of maintenance of functional units of the machine set rotor. Diagnosing the functional units of the machine set can significantly increase the effectiveness and efficiency of the main...
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Andrey Batrakov, Alexander Kusyumov, Sergey Kusyumov, Sergey Mikhailov and George N. Barakos
In this work, fully-resolved rotor-fuselage interactional aerodynamics is used as the forcing term in a model based on the Euler-Bernoulli equation, aiming to simulate helicopter tail-boom vibration. The model is based on linear beam analysis and capture...
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Volodymyr Yatsun,Gennadiy Filimonikhin,Antonina Haleeva,Larisa Krivoblotsky,Yurii Machok,Mareks Mezitis,Nataliia Podoprygora,Mykola Sadovyi,Guntis Strautmanis
Pág. 103 - 111
The dynamics of a three-mass vibratory machine with the rectilinear translational motion of platforms and a vibration exciter in the form of a ball, roller, or pendulum auto-balancer have been analytically investigated.The existence of steady state motio...
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Jaroslav Zapomel,Petr Ferfecki,Jan Kozánek
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Jaroslav Zapomel,Petr Ferfecki,Jan Kozánek
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Falk Pätzold, André Bauknecht, Andreas Schlerf, Denis Sotomayor Zakharov, Lutz Bretschneider and Astrid Lampert
The flow field induced by multirotor drones is of high interest for atmospheric research, as it locally influences the atmosphere and therefore may have an impact on the sensors installed for atmospheric measurements. Further, on-board vibrations can cau...
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Janusz Petryna, Arkadiusz Duda and Maciej Sulowicz
In the condition monitoring of induction machines operating in various industry sectors, the assessment of eccentricity is as important as the assessment of the condition of windings, bearings, mechanical vibrations or noise. The reasons for the eccentri...
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Jerzy A. Owczarek
This Technical Note calls attention to the fact that observed initiation of stall in an axial flow compressor can be explained by the pressure pulses reflecting between the stator and rotor blades. The phenomenon of reflection of pressure pulses between ...
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Yuanwen Li and Changsheng Zhu
In this paper, a control strategy based on the inverse system decoupling method and µ-synthesis is proposed to control vibration in a rigid rotor system with active magnetic bearings that are built into high-speed motors. First, the decoupling method is ...
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Yuanxing Dai, Zhenghao Liu, Wei Zhang, Jianping Chen and Jianguo Liu
This paper investigates the problem of vibration in an axial flow waterjet propeller with high power density and low specific speed. Based on fluid?structure coupling vibration analysis, combined with modal analysis and ship tests, the unsteady fluid?str...
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Zuzana Murcinková, Jozef ?ivcák, Jozef Zajac and Pavel Adamcík
In this study, the effect of multi-layer composite passive dampers on the dynamic properties of a mechanical system (a testing machine tool bench) was tested. Passive dampers are characterized by a layered structure, with each layer consisting of a speci...
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Pawel Ewert
This article presents the effectiveness of bispectrum analysis for the detection of the rotor unbalance of an induction motor supplied by the mains and a frequency converter. Two diagnostic signals were analyzed, as well as the stator current and mechani...
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Chao Fu, Dong Zhen, Yongfeng Yang, Fengshou Gu and Andrew Ball
This paper investigated the nonlinear vibrations of an uncertain overhung rotor system with rub-impact fault. As the clearance of the rotor and stator is getting smaller, contact between them often occurs at high rotation speeds. Meanwhile, inherent unce...
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Jenny Niebsch, Ronny Ramlau and Thien T. Nguyen
Due to its effect on the operation time of wind turbines, rotor imbalances of a wind turbine have to be detected early enough. We present a method that determines inhomogeneous mass distributions of the rotor as well as deviations in the pitch angles of ...
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Rafel Roig, Xavier Sánchez-Botello, Berhanu Mulu, Carl-Maikel Högström and Xavier Escaler
The growing installation of intermittent renewable energy sources is forcing hydraulic turbines to work more frequently at speed no load when dangerous vaneless space vortex structures and stochastic flow phenomena can occur. An experimental campaign has...
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Antonio Carlo Bertolino, Matteo Gaidano, Stefano Smorto, Paolo Giovanni Porro and Massimo Sorli
Vibrations generated by the main rotor-gearbox assembly in a helicopter are the principal cause of damage to cockpit instruments and crew discomfort in terms of cabin noise. The principal path of vibration transmission to the fuselage is through the gear...
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Denghao Wu, Songbao Yao, Renyong Lin, Yun Ren, Peijian Zhou, Yunqing Gu and Jiegang Mou
The flow instability of a double-blade centrifugal pump is more serious due to its special design feature with two blades and large flow passages. The dynamic instabilities and pressure pulsations can affect the pump performance and operating lifetime. I...
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Jianye Niu, Jiang Wu, Qiming Liu, Li Chen and Shijie Guo
A piezoelectric motor driven by the first-order torsional and first-order flexural (T/F) vibrations is designed, fabricated, and tested in this study. The actuating force is generated by the torsional vibration of the dumbbell-shaped vibrator, while the ...
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Zbigniew Goryca, Sebastian Rózowicz, Antoni Rózowicz, Artur Pakosz, Marcin Lesko and Henryk Wachta
This paper focuses on the matter of cogging torque reduction by combining various methods of cogging torque minimization. Due to the high costs of prototype construction, cogging torque is minimized during the design phase by using numerical methods, whi...
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