汽车摩擦材料缩比Krauss摩擦试验机的研制及比较性评价

为了提高小样试验工况的可模拟性,降低试验成本,提高试验效率,以Krauss试验机为原型,根据相似原理,应用量纲分析法推导缩比Krauss试验机的基本参数,研制了一种缩小比例的Krauss试验机。选用PVW-3212试验规程,选取同一批次汽车制动衬片进行试验研究,通过对摩擦因数、试验温度和试验周期等指标进行比较。结果表明,全程平均摩擦因数较接近,摩擦因数最大值和最小值出现的阶段和制动次序均相同,全程平均温度具有很好的线性相关性。执行相同PVW-3212试验规程的情况下,在制动初始和制动解除阶段,缩比Krauss试验机压力响应较快,全尺寸Krauss试验机压力响应较慢,缩比试验制动结束时间提前约100 ms,每次试验成本约为全尺寸Krauss试验机的29.67%。缩比Krauss试验机与全尺寸Krauss试验机具有较好的一致性和可比性,证明了该缩比Krauss试验机的可靠性,为摩擦材料的测试提供了一种新的试验装置。

Development and Comparative Evaluation of Reduced-scale Krauss Friction Tester for Automobile Friction Materials

In order to improve the simulation of the sample test conditions, reduce the test cost, and improve the test efficiency. Taking the Krauss tester as a prototype, the basic parameters of the reduced-scale Krauss tester were obtained according to the similarity principle and the dimensional analysis method. The reduced-scale Krauss tester had been developed. The same batch of automobile brake linings have been rigorously evaluated on two Krauss testers following PVW-3212 procedure and have been discussed these parameters such as friction coefficient, experimental temperature and test cycle. The results show that the average friction coefficient is relatively close, the maximum and minimum values of the friction coefficient appear at the same stage and the same braking sequence, and the average temperature of the whole process has good linear correlation during the entire test. When the same PVW-3212 test procedure is carried out, the pressure response of the reduced-scale Krauss tester is faster than that of the full-scale Krauss tester in the initial braking and braking release stages, so the reduced-scale Krauss tester brake completion time is about 100 ms earlier, and the test cost is approximately 29.67% of the full-scale Krauss tester. The reduced-scale Krauss tester has good consistency and comparability with the full-scale Krauss tester, which proves the reliability of the reduced-scale Krauss tester and also tries to provide a new test device for the friction material test.