A study was conducted to determine the ability of neural networks to extract high level control information from cylinder pressure data. Various experiments were performed us ing neural networks for pattern recognition on a series of data files consist ing of cylinder pressure versus crank angle. The goal of these experiments was to estimate spark timing based on the cylinder pressure signature...

BACKGROUND Ultrasonic motors (USM) are based on the concept of driving the rotor by a mechanical vibration excited on the stator via piezoelectric effect. USM exhibit merits such as simple structure, quick response, quiet operation, self-locking when power off, nonelectromagnetic radiation and higher position accuracy. PRINCIPAL FINDINGS A cylindrical type traveling wave ultrasonic motor usin...

A new ultrasonic phased array transducer to increase the imaging resolution of the borehole wall is presented for acoustical logging. We fabricate a cylindrical phased array which is made up of 128 piezoelectric elements distributed on the surface of a cylinder uniformly. The working frequency of each element is 0.5MHz. Through the switch array, different combinations of the elements can lead a...

This paper demonstrates that a hydraulically acting Helmholtz resonator can exist in a piezoelectric–hydraulic pump (PHP) based hybrid actuator, which in turn affects the volumetric efficiency of the PHP. The simulation and experimental results illustrate the effect of Helmholtz resonance on the flow rate performance of the PHP. The study also shows how to shift the Helmholtz resonant frequency...

In this paper ,the general solution of steady-state one dimensional asymmetric thermal stresses and electrical and mechanical displacements of a hollow cylinder made of functionally graded material and piezoelectric layers is developed .The material properties ,except the Poisson's ration, are assumed to depend on the variable radius and they are expressed as power functions of radius. The temp...

A novel vortex induced piezoelectric energy converter (VIPEC) was present in this paper to harvest flow kinetic from the ambient environment through a beam. The consists of circular cylinder, pivoted beam attached tail cylinder and several patches. Vortex pressure difference acts on drives squeeze piezo patches convert fluid dynamic into electric energy. Transition Shear Stress Transport (SST) ...