This paper proposes an advanced design concept for a piezoelectric energy harvesting (EH) device, multimodal EH skin structure, a thin and compact harvester which can generate power from multimodal vibration. Multimodal EH skin is an extended study of our previous works, EH skin, which is a new conceptual design for piezoelectric energy harvester by combining a vibrating skin structure and an a...

A new piezoelectric-based mechanism was proposed, modeled and tested. This mechanism was basically designed to be periodically excited while in contact with a driven surface. Two piezoelectric elements located by the angle of 901 relative to each other are used to create elliptical motion on tip of the mechanism depending on the applied phase difference. In order to ensure the designated ellipt...

Energy harvesting is the most effective way to respond to the energy shortage and to produce sustainable power sources from the surrounding environment. The energy harvesting technology enables scavenging electrical energy from wasted energy sources, which always exist everywhere, such as in heat, fluids, vibrations, etc. In particular, piezoelectric energy harvesting, which uses a direct energ...

Piezoelectric dynamometers are out of use in high humidity. Experimental results showed that piezoelectric coefficients measured by the force-induced charges method initially fluctuated in a small range and then was unstable, and they could not be measured at high relative humidity (RH). The traditional shielding method-insulation paste was not quiet convenient, and it even added the weight of ...

Piezoelectric actuators (PEAs) have been widely used in microand nanopositioning applications due to their fine resolution, fast responses, and large actuating forces. However, the existence of nonlinearities such as hysteresis makes modeling and control of PEAs challenging. This paper reviews the recent achievements in modeling and control of piezoelectric actuators. Specifically, various meth...

This paper describes vibration diagnosis based on electric faults. These faults could appear in electrical equipment in general, but this paper focuses on the case of transformer, induction and dc motor. In order to do the diagnosis there are analysed vibration signals from the piezoelectric accelerometer. This accelerometer is installed on the frame of the equipment. The signals acquired are a...

Tri-axial accelerometers have been used to remotely identify the behaviors of a wide range of taxa. Assigning behaviors to accelerometer data often involves the use of captive animals or surrogate species, as their accelerometer signatures are generally assumed to be similar to those of their wild counterparts. However, this has rarely been tested. Validated accelerometer data are needed for po...

Hysteresis is an important nonlinear effect exhibited by piezoelectric actuators and its control has been drawing considerable attention. This paper presents the development of an inversion based model predictive control to compensate for piezoelectric actuator hysteresis. Experiments were carried out to verify the effectiveness of the developed control method. The result obtained shows that th...

Stiffness relations for voltage-dependent contact mechanics of piezoelectric material are derived for an indenter of arbitrary planform under normal force, centrally or noncentrally applied, and electric charge distribution at the base. Relations between indentation depth, indentation force, electric potential and electric charge are explicitly given in terms of indenter’s geometry and piezoele...

The purpose of this study was to use computational fluid dynamics software Fluent, the numerical simulation to discuss the impact pressure within the flow channel device for flat radiator fan heat flow characteristics. Piezoelectric fan was placed in front of the flow channel, and the cold air flow was introduced to the radiator cooling fan, and thus generated vortex fluid in the flow path arou...