Kunming Bus Company Sunwin Brake Friction Linings Noise Study

This paper is mainly about improving vehicle use friction material and reducingvehicle brake noise of Shengao passenger bus. With the improvement of friction sheetmaterial prescription as breakthrough point, we aim at raising the friction performanceand high temperature capability, so that we can reduce the friction of mating plateefficiently and reduce brake noise.Combinatorial friction materials research based on the original friction material.formulation of Shengao passenger train is conducted. Raw materials used are screened byfour criteria: (a) those raw materials with good wear resistance should be preferred;(b)select those raw materials which have good wear resistance when they combine withgroup (a) raw materials; (c) select those raw materials that have the function of reducingbrake noise;(d) select those raw materials which can cut the cost but don't degradefriction performance.Latin square coupled with Golden Section approach is utilized forexperimental formulations design. Comprehensive index of raw materials is obtained bythe relational grade analysis. The fuzzy overall merits method is utilized to judgecomprehensive index and evaluate merits of multi-objective friction materialformulations,so that we can determine one friction material formulation with the bestfricition performance.Using fixed-velocity D-MS friction experiment machine we test the crucial propertyfor the autonomous new brake friction material. Test content includes mainly:hotdecline,wear rate, blow energy and the friction coefficient of test piece in differentexperiment temperatures. On fixed-velocity friction experiment machine, we adoptadvanced friction vibration and noise experiment methods, use HY104A model of theordinary sound level analyzer to test in some fixed points, and take autonomousstrengthened new brake friction material for object.We analyse and study brake noisethat some kinds of friction flats produces.Through observing and analyzing the propertyof friction material and experiment phenomenon and data, we discover the strong weaklevel of noise has close relation with friction material formulation and the compositionof material. Eventually we decide the best formulation to degrade the brake nose by road test.Brake friction material is a crucial factor to influence vehicle travellingsafety.Through the research of this program we can offer some reference about how toselect reasonable friction material group and improve the property of friction fiats.