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This paper presents a disturbance feedforward control strategy for active vibration isolation systems with internal air mount dynamics. First, a parametric model of an air mount system including a Helmholtz resonance is derived, which is an extension to the widely used massless spring-damper models for vibration isolators. Second, a self-tuning feedforward controller is proposed that fine-tunes the...
Spring-mass structure of high-g MEMS accelerometer is designed based on lumped-parameter analytical models and polymer film-beam constraints structure. The film-beam bone of spring-mass structure is used from silicon and organic polymer film material. The mechanical structure characteristic performs a sort of vibration flexibility to resonant frequency from its single proof-mass movement. According...
We propose a segmented piezoelectric energy harvester in the flexural mode for scavenging ambient vibration energy. 4 circuit connection patterns between segment piezoelectric bimorphs are presented. The resonant frequency of a segmented piezoelectric harvester is readily adjusted through changing either its geometrical configuration or circuit connection pattern, which can keep the harvester operating...
A nonlinear dynamic model of planetary gear train with backlashes, time-varying stiffness and transmission errors, was developed to simulate the dynamics of the system. The motion equations of the system were deduced. The specific effect of the transmission errors on the dynamic behavior of the planetary gear system was investigated using digital simulation technique. The bifurcation diagrams of displacement...
A lumped-parameter model of a single-stage planetary gear train was established. The influence of the rotary inertia of the sun gear on the dynamical behavior of planetary gear train was investigated. The steady responses were obtained by using numerical method. The characteristic of the system was described by time history, phase plane plot, Poincare section and FFT spectrum. The result shown clearly...
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