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This paper describes the basic theoretical knowledge of piezoelectric ceramic materials, analyzes piezoelectric bimorph deformation theory, sums up the common way of working of the piezoelectric bimorph as a driving source. Based on the internal energy analysis of three layers structure piezoelectric bimorph, we establish a model of output force and output displacement under different loading conditions...
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 presents an analytical and experimental study of a compact configuration to harvest energy from a rotating gear using piezoelectric microelectromechanical system harvesters. The reported configuration realizes a contact-type frequency up-conversion mechanism in order to generate useful electrical energy. The up-conversion mechanism was achieved using an atomic force microscope (AFM)-like...
A method is proposed for the resonant suppression of a flexible system based on vibration signal feedback. In addition to a torque, speed and position feedback control structure, this method filters some specific vibration frequencies of the output and then feedback them to the input of the system. Thus it is featured by a concise control structure and simple parameter design procedures. The paper...
Energy harvesting has the potential to save billions of dollars and create ground breaking technologies for sustainable ocean monitoring systems. Replacement of batteries from the sensors deployed on sea floor is expensive and tedious process. The cost of maintenance for battery operated equipments in the deep waters may be prohibitive. Thus, it is highly desirable to develop a system that harnesses...
Based on equivalent linear treatment of the gas force load, the mathematical model of motor system was established. Then, the effect of gas force load and operating frequency on the power factor was investigated. The predicted analysis was validated by corresponding experimental and simulated results. The results shown that maximum power factor is obtained when the operating frequency near the mechanical...
In this paper preliminary results regarding a vibrating tactile sensor are presented. More specifically, two IPMC strips are used, one as actuator and one as sensor, that work together for the differentiation of tissues. In fact, the characteristics of the resonant vibrating IPMC system change with the applied load. This allows for calculating the parameters of the mechanical load, by measuring the...
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,...
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