Development and Comparative Evaluation of Reduced-scale Krauss Friction Tester based on Similarity Theory

IF 0.6 4区 工程技术 Q4 MECHANICS Mechanika Pub Date : 2022-08-30 DOI:10.5755/j02.mech.32030
Zhenyu Wang, Jie Wang, Lining Wang, Yunhai Ma
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Abstract

Based on the similarity principle, the basic parameters of the reduced-scale Krauss tester were derived from the full-scale Krauss tester by using the dimensional analysis method. The main structure of the Krauss testing machine had been made, and some components and parts such as brake system, servo loading system and torque measuring system had been designed and manufactured. The same batch and molded NAO brake friction material had been rigorously evaluated on two Krauss testers following ECE R-90 procedure as per the ‘‘Economic Commission for Europe” (ECE) regulations and these parameters such as friction torque, brake pressure, friction coefficient, test temperature and time had been discussed. The results showed that the reduced-scale Krauss tester was faster response than that of the full-scale Krauss tester in the process of brake growth and brake release, the brake completion time was about 370 ms ahead of schedule. However, the full-scale Krauss tester had a slower response and the brake completion time delay was about 240 ms. During the entire test, the average coefficient of friction was closer and the relative error is 6.3%, and the maximum and minimum values of the friction coefficient appeared at the same brake sequence, test section and brake cycle. The test temperature had good linear correlation in the whole test process. The total test time for reduced-scale Krauss tester was about 4/5 of full-scale Krauss tester. In each test, if the same other conditions existed, the power cost of the reduced-scale Krauss tester is 20.79 % of the power cost of the full-scale Krauss tester when the ECE R-90 test program was executed. From the comparison of the main test indexes, the test data of the scaled Krauss test machine reflected the fluctuation and correlation of the test data of the full-scale Krauss test machine to a certain extent, providing a new test equipment for the brake friction material.
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基于相似理论的克劳斯摩擦试验机研制与比较评价
基于相似原理,利用量纲分析法,从全尺寸克劳斯试验装置中推导出缩小尺寸克劳斯试验装置的基本参数。制作了克劳斯试验机的主体结构,设计制造了制动系统、伺服加载系统和扭矩测量系统等零部件。根据“欧洲经济委员会”(ECE)规定,按照ECE R-90程序,在两台克劳斯测试机上严格评估了同一批次和成型的NAO制动摩擦材料,并讨论了摩擦扭矩、制动压力、摩擦系数、测试温度和时间等参数。结果表明,缩小尺寸的Krauss测定仪在制动增长和制动释放过程中的响应速度比全尺寸Krauss测定仪快,制动完成时间提前约370 ms。然而,全尺寸Krauss测试器的反应较慢,制动完成时间延迟约为240毫秒。在整个试验过程中,摩擦系数的平均值更接近,相对误差为6.3%,摩擦系数的最大值和最小值出现在相同的制动顺序、试验段和制动周期。试验温度在整个试验过程中具有良好的线性相关性。缩小尺寸Krauss测试仪的总测试时间约为全尺寸Krauss测试仪的4/5。在每次测试中,如果存在相同的其他条件,当ECE R-90测试程序执行时,缩小尺寸克劳斯测试仪的功率成本是全尺寸克劳斯测试仪功率成本的20.79%。从主要试验指标的对比来看,规模化克劳斯试验机的试验数据在一定程度上反映了全样机克劳斯试验机试验数据的波动性和相关性,为制动摩擦材料提供了一种新的试验设备。
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来源期刊
Mechanika
Mechanika 物理-力学
CiteScore
1.30
自引率
0.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is publishing scientific papers dealing with the following problems: Mechanics of Solid Bodies; Mechanics of Fluids and Gases; Dynamics of Mechanical Systems; Design and Optimization of Mechanical Systems; Mechanical Technologies.
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