Laboratory experiments are performed to measure the amplitude of internal waves generated by an elliptical cylinder oscillating vertically with different frequencies and amplitudes in a uniformly stratified fluid. The experimental results are compared with the theoretical predictions of Hurley and Keady ~1997!. Though in qualitatively good agreement with experiments, the theory underestimates t...

Electro hydraulic actuator (EHA) system has inner and outer loops like a cascade system. The inner loop consists of an electric motor, a gear pump, and an angular velocity controller, and the outer loop consists of a hydro-actuator and a position controller. Especially, dead-band nonlinearity that exists between the electric motor and the gear pump and friction that occurs between the cylinder ...

In this article we prove a linear inviscid damping result with optimal decay rates of the 2D irrotational circulation flow around an elliptical cylinder. our result, no components asymptotic velocity field vanish, and lines are longer ellipse.

A CNC machine tool for machining designed to facilitate the replacement of cutting tools includes a workbench, motor and hydraulic cylinder. The inner bearing workbench is connected with rotating rod, outer key rod half gear, output end lower rod. machining, which convenient replacing tools, realizes linkage between body adjusting gear by using tooth block, drives move rotation screw adjust pos...