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Gearboxes are important parts of mechanical transmission systems, so that it is very pivotal for avoiding future catastrophic failures to detect faults in gearboxes at the early stage. Various vibration analysis techniques have been proposed and successfully applied to detect faults in gearboxes. The outputs of these techniques are used to identify the signal changes caused by defects. Because of...
A MEMS (Micro-Electro-Mechanical Systems) bulk disk resonator is applied for mass sensing under its dynamic mode. The classical readout circuitry involves sophisticated feedback loop and feedthrough compensation. We propose a simple straightforward non-loop pulse mode actuation and capacitive readout scheme. In order to verify its feasibility in liquid bio-chemical sensing environment, an experimental...
PVDF piezoelectric materials are widely used because of its good performance, but the structure of this material is thinner, and there exits the shear locking problems when analyzing force electric coupling, therefore, the basic research of piezoelectric properties also has certain limitations. In order to solve the above problems, this paper introduced the idea that makes a coupled modal analysis...
Vibration and acoustic noise are the important reasons for switched reluctance motor to be unacceptable in variable speed drive market. To optimize the physical structure of the motor and to choose the appropriate control strategies are the two conventional ways to reduce the noise. In this paper, a new method is proposed to combine these two optimization ways together: harmony optimization of switched...
Based on the review of researches on the vibration and noise related to automobile brake, a four degrees of freedom nonlinear dynamics model of brake disk and pads is established, the stability of vibration system at the equilibrium points is analyzed. Finally the numerical method is taken to study the impacts of brake pressure, shape parameter and the brake disk's initial velocity on the vibration...
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