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The behavior of scissor action dry friction damper under harmonic loading has been presented. Finite element model was developed in PTC CREO and then imported in ANSYS to check the response with varying values of normal force (100N, 120N and 150N). A constant force of 20N is applied to excite the damper harmonically. Moreover the experiments are performed after fabricating the device to validate the...
The steady-state regime of a moving load on an elastic half-plane is addressed. It is shown that the solution can be expressed through a single harmonic function, similarly to the known eigensolution for surface Rayleigh wave, thus reducing a vector problem in linear elasticity to a scalar one for the Laplace equation. Examples of steadily moving vertical force and punch are investigated, illustrating...
Linear oscillating motor provides short-stroke reciprocate motion with high efficiency and long lifespan, receiving much attention, especially in aerospace applications. LEHA is a novel flight actuation system, in which linear oscillating motor plays an important role. Thus, high output performance of LEHA relies on detailed researches into dynamics of linear motor. In this study, dynamics model is...
This paper investigates the effects of loading and slot harmonic on radial magnetic forces in a low-speed permanent magnet (PM) machine with non-overlapping concentrated windings. Vibration level of the PM machines with concentrated windings can be potentially higher compared with that of the traditional machines with distributed windings. It is mainly due to the presence of low-order spatial harmonics...
It is presented in this paper that a novel soil drilling sampler which can be used to drill deeply automatically in the planetary soil. There are three transmission routes of motion in the drilling sampler: rotating drive mechanism and feeding drive mechanism are used to generate the rotary and axial movement of the driller respectively while impacting drive mechanism is used to assist drilling the...
Design of multi-level packages for better reliability life under drop impact is often conducted through board-level drop testing. Among many failure modes associated with the board-level drop impact test, PCB pad cratering and solder joint disconnection are of particular interests. Because of the complexity and rigor in modeling and simulations, most of the present work is completed through design...
We developed a one-degree-of-freedom (vertical up-down motion) power assist robot for manipulating objects. The robot system was simulated and subjects manipulated objects with the robot in harmonic motion i.e. the objects were repeatedly lifted up and lowered down during the simulation. We then critically analyzed human's weight perception, load forces and object's motion features. We then introduced...
Bouncing is a typical activity of human body and it can generate dynamic loading which should be considered in various occasions. Three different bouncing load models in literature are compared in this paper, including the theories developed by E. Duarte and T. Ji in 2009, J. G. Parkhouse and D. J. Ewins in 2006, J. W. Dougill et al. in 2006. Base on the coefficients given in literature, the comparison...
In this work, we present modeling and experimental data for controlling the dynamic pull-in and the escape-from-potential-well phenomena for a capacitive MEMS device using phase control technique. The device is actuated with a DC voltage superimposed to an AC harmonic voltage. An inevitable escape band of frequencies, where a MEMS resonator is forced to pull-in, is simulated theoretically and found...
In the paper, the characteristics of mode and harmonic response of the axis of the high-speed motorized spindle are presented with the FEM (Finite Element Method). A dual-dimension model with the FEM is developed and simulated using ANSYS commercial software. The result shows that the rated rotating speed of the high-speed motorized spindle is far smaller than the first-order natural resonance speed,...
A new low cost integration of force and moment measurements into a wheel bearing is proposed. Those data will enhance performances of existing driving assistance systems and enable emergence of new ones. The measurement principle stems from the dependancy between the contact forces transmitted by the balls and the force components to be measured. The deformations caused by the contact forces come...
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