Micro piezoelectric vibration generator with high energy density may provide infinite and continuous energy for wireless sensor network. In order to improve generating capacity under given dimension, aiming at external force and displacement incentive environment, mathematics model of piezoelectric cantilever generator generating capacity are established, and influence law of unimorph and bimor...

This paper explores a concept for dynamic amplification of piezoelectric actuator motion using repeated impacts between the active transducer and compliant mechanism. The design shows good performance in amplifying vibration lead–zirconate–titanate (PZT) bimorph while down-converting output frequency from more than 150 Hz to less 20 Hz. A simple model is used identify conceptual opportunities i...

A metamodel-based approach is developed to optimize the force and displacement performance of a piezoceramic bimorph actuator. A segmented design with a variable piezoceramic layer thickness is proposed, where the thicknesses of discrete piezoceramic segments are used as the design variables. Design of experiments and metamodeling techniques are employed to construct computationally inexpensive...

One of the key requirements for MEMS speakers is to increase sound pressure level (SPL) while keeping size as small possible. In this paper we present a speaker based on piezoelectric bimorph cantilevers that produces higher SPL than conventional unimorph cantilever speakers. The active diaphragm 1.4 × mm2. are connected in parallel make full use actuation voltage. At 1 kHz, measured reached 73...

Piezoelectric materials can be used as a means of transforming ambient vibrations into electrical energy that can be stored and used to power other devices. With the recent surge of micro scale devices, piezoelectric power generation can provide a convenient alternative to traditional power sources used to operate certain types of sensors/actuators, telemetry, and MEMS devices. However, the ene...

Lattice structures are presented with a piezoelectric sensitivity, d, much larger in magnitude than that of material comprising the lattice ribs. Large sensitivity is achieved by using piezoelectric bimorph elements as ribs; these bend in response to electric input, giving rise to a much larger displacement than for axial elements. Complex electrical connectivity is helpful but not necessary; s...

New giant piezoelectric factor materials such as PMN-PT and PZN-PT were researched during the last decade and are actually becoming commercially available. As they seem very attractive for actuator designs, we studied their potential in replacing PZT ceramics. In a first comparative approach, we tested a series of classic rectangular composite bimorph structures of different combinations of thi...