These extreme anomalies are named ultra low velocity zones(ULVZ),and are best model.

H-Infinity Control for a super inertia, ultra-low speed and high precision servo System;

In this paper,an ultra-low speed elevation system,with PLC used for controlling,is introduced.

This paper introduces the principle of the closed hydraulic system of the logging truck,especially the structure principle of the ultra-low speed valve.

The principle,constitution and realization of aerospace digital super low speed high accuracy servo system based on direct torque control of rare earth permanent magnet external-rotor slotless brushless sinusoidal torque motor are analyzed and explored.

The super-low-speed servo system we designed is about the same as MAPS in super low speed but is an order of magnitude better than MAPS in tracking precision.

Based on special demands of super low speed high accuracy servo system, the thesis analyzes and explores the mathematical model, design method, key technology of brushless slotless sinusoidal motor.

Based on the flow pattern stniccure obtained from free flight experiments, a method of solving the low supersonic, high Revnolds numbers separated flow problem is proposed in this paper by which the inviscid region of the afterbody flowfield of a sphere has been simulated numerically.