超高速试验机动力学研究

The Research on the Dynamics of High-speed Friction and Wear Test

System in Mechanical Engineering

Key words:Ultra-high-speed rotation; Friction and wear;Scrape;Dynamics

Abstract.By researching the dynamics of high speed friction and wear test system, establish

the statics and dynamics model of high-speed dial and get the equation of motion of turntable scrapers state. Using Ansys Workbench software platform analysis the order moda l of the turntable, get the kinetic parameters of the system. Some suggestion and methods are proposed

on avoiding vibration of turntable system.

Introduction

Abradable coatings are mainly used to reduce the gap between rotating parts and machine box of the aero-engine, can effectively improve the power and thrust of the turbine engine. At present，the performance evaluation of abradable coatings including: abradability，erosion resistance, thermal shock resistance, high temperature oxidation resistance, the bonding strength between the coatings and the matrix and so on[1-2],the mainly method to evaluate coating performance is simulating the high speed and high temperature working environments,the research of the high speed friction and wear test system is aimed to evaluate coating performance. As the core components of the high speed friction and wear test system, the dynamic performance of the ultra-high speed rotary system directly affects the working stability and reliability of the whole system.

Rotating disk is one of the basic mechanical components widely used in rotating machinery. At present, the research of the dynamics of the rotor system is widely done, mainly concentrates in the method of the rotor dynamic balance and the rubbing phenomenon during rotor operation process, it aims to optimize the rotor structure to reduce the friction of vibration and dynamic balance. To realize the coating skiving experiment, high speed rotary table of the ultra-high speed friction and wear test system is not only affected by factors such as support bearing, unbalance mass and so on from the internal system, but also affected by Intermittent skiving impact.

This paper gives motion stability analysis of the ultra-high speed rotary scraping.

1. The design of ultra-high speed rotary system

1.1 Working principle of the high speed friction and wear test system

Three dimensional model diagram of the high speed friction and wear test system is shown in Fig 1. Ultra high speed friction and wear test system is mainly composed of high speed motor, high speed rotary, heating device, micro feed linear motor, feed sliding table, coating sample, the infrared pyrometer composition. It makes the coating sample and the high speed rotating blade tip contact through the high speed motor drives the wheel rotation with a tip and linear motor drives feed sliding table to fulfill trace feed of the coating sample to realize the coating scraping. Among these parts, the gas gun is placed at the lower end of the high speed rotary table to heat the contact area between rotary table and tip to reach the working temperature of 1200 ℃.