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In this work, we propose an object behavior evaluation system based on wireless sensor network. By the behavior information of objects contacted with human, it can evaluate the behavior characteristics of human under the interactions between human and environment, which goes beyond the traditional evaluation methods that directly monitor human themselves. The system can track and monitor the motion...
This paper reports parametric drive of a micro Center Support Quadruple Mass Rate Integrating Gyroscope (CSQMRIG) using discrete electrodes. The CSQMRIG consists of four proof masses connected by beams and is supported by a single anchor in the center. To reduce the complexity for the design of parametric drive electrodes, discrete electrodes in X and Y axes are employed to achieve parametric pumping...
This paper reports a multi-order system dynamic model of the novel planar gyro — Center Support Quadruple Mass Gyro (CSQMG) with an application of dynamic analysis. Compared with the dual-mass resonance system, a resonator with quadruple masses possessing 12 degree of freedom (DOF) is more complicated, and so is the error analysis. As a consequence, the lumped parameter model in a generalized coordinate...
The board level vibration reliability of the Package-on-Package (PoP) structure with different underfill types was investigated by finite element method (FEM). Underfill methods used in this study were the full-filled method, the corer-bonded method and the edge-bonded method. Results show that all of them can obviously improve the reliability of PoP structure in random vibration environment. The...
This paper investigates the reliability of the Package-on-Package (PoP) under random vibration loading by experimental tests and FEM simulations. An event detector was used to monitor the PoP failure times under random vibration. A finite element model of the PoP assembly model was built in ANSYS, and the natural frequencies and modes were calculated and verified by experimental model test. The results...
This paper reports a novel Center Support Quadruple Mass Gyroscope (CSQMG), which combines the advantages of tuning fork gyros (TFGs, large mass and high resolution) and the micro hemisphere resonant gyros (MHRGs, fully symmetric and high Q), and is expected to achieve performance breakthrough of flat structures. The operation of the CSQMG is based on four proof masses symmetric distributed circumferentially,...
This paper reports a MEMS resonator with closed-loop vibration control which can be parametric driven at ambient pressure. Non-interdigitated comb fingers are used as parametric force electrodes and optimized design enables the electrodes to generate large electrostatic stiffness, which makes parametric drive possibly realized at ambient pressure and low Q-factor (65.8). Closed-loop vibration control...
This paper examines a new method on static tension measurement of overhead transmission line based on vibration spectrum analysis. Firstly, the causes of vibration of overhead transmission line are discussed. And then, static and dynamic characteristics of conductors are analyzed, and with reasonable simplification, taught string model is brought in to describe the relationships between static tension...
In order to explore the influence of various fixation method on vibration fatigue reliability of high density PCB assembly, a three-dimensional simulation model which was almost completely in keeping with test samples was created, and the modal parameters were obtained through modal test and finite element method respectively. Based on the verification of FEM Model correctness, through designed different...
In order to understand the vibration characteristic of plastic BGA solder joints, the test vehicles with daisy chain were designed, vibration reliability test platform and real-time monitoring platform were developed, a series of vibration test including sweep vibration at different levels and random vibration were conducted, and the comparative study for experiments and simulation results was carried...
The above ground marker system (AGM) is an important part of pipeline internal inspection instrument, which can reduce the mileage error and improve the positioning precision. A AGM based on geophone array was proposed aiming at increasing depth problem of the pipeline. It can record and amplify the sound of an approaching pipeline pig's cups striking the welds of a pipe to an easily discernible level...
This paper presents the fourth order vibratory micromachined gyroscope prototype with coupling forces between two modes and the coupling error expression which reveals all the factors affecting the amplitude of the error. A detailed discussion has been performed to determine that the diversity of structures of drive combs and sense combs is the main source of the Quality factor in drive mode varying...
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