Assessment of the usability of the EUSAMA and the phase angle method in examining the condition of shock absorbers installed in a vehicle

Z. Lozia
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引用次数: 2

Abstract

The article is a continuation of the author's earlier considerations concerning the methods of testing shock absorbers installed in the vehicle. The work concerns the analysis of the usability of two methods: the EUSAMA method and the phase angle method. The first one examines the minimum ratio of the force in contact between the wheel and the vibration-inducing plate (on which the wheel of the tested suspension rests) and the static value of this force. The second one uses the minimum of the phase shift angle between the excitation (vertical movement of the said plate) and the force in contact between the tire and this plate for diagnosis. Two linear quarter-car models and their description in the frequency domain were used to evaluate two analyzed methods. For both evaluated methods, the monotonicity of the dependence of the diagnostic parameter on the diagnosed one (damping in suspension) is visible; in the case of the phase angle method it is close to linear. The correction of the results related to the inertia of the vibration-inducing plate was considered. The calculations were made for two typical data sets: for the front and rear suspension of a middle-class passenger car. They allow a general qualitative and (to a limited extent) quantitative assessment of the usefulness of the analyzed methods. For the EUSAMA method, the test result has a noticeable effect of the inertia of the vibration-inducing plate. This confirms the legitimacy of correcting the force measured in the diagnostic stand. Values without correction are more optimistic. For cars with a low weight or a lightly loaded road axle (especially the rear axle) of heavier vehicles, low values of the diagnostic parameter are obtained, suggesting a bad condition of the shock absorbers, which is not confirmed by their examination in the state removed from the vehicle. In the second assessed method, there are clear differences between the values of the phase angle obtained based on testing the force in the wheel-plate contact and those obtained for the analysis of the force measured in the test stand. Therefore, the correction for the value of the station plate inertia force is significant. Values without correction are more pessimistic, although it is not justified in the condition of the tested vehicle. The works cited in the article describe several practical drawbacks of the phase angle assessment method. The author points to the importance of further research, much more laborious, with the use of nonlinear models and the necessary experimental verification of the obtained simulation results.
评估EUSAMA和相位角法在检查车辆减震器状况中的可用性
这篇文章是作者先前对安装在车辆上的减震器的测试方法的考虑的继续。本文分析了两种方法的可用性:EUSAMA法和相角法。第一个测试检查车轮与振动诱导板(被测试悬挂的车轮位于其上)之间的最小接触力比以及该力的静态值。第二种方法使用激励(所述板的垂直运动)和轮胎与该板之间接触的力之间的相移角的最小值进行诊断。利用两种线性四分之一小车模型及其频域描述对两种分析方法进行了评价。对于两种评估方法,诊断参数对诊断参数(悬架阻尼)依赖性的单调性是可见的;在相位角法的情况下,它接近线性。考虑了与激振板惯性有关的结果的修正。计算是针对两个典型的数据集进行的:一辆中产阶级乘用车的前后悬架。它们允许对分析方法的有用性进行一般的定性和(在有限程度上)定量评估。对于EUSAMA法,测试结果受激振板惯量的影响比较明显。这证实了修正在诊断台中测量的力的合法性。没有修正的价值更乐观。对于重量较轻的汽车或较重车辆的轻载路轴(特别是后桥),获得的诊断参数值较低,表明减震器的状况较差,而减震器在车辆拆卸状态下的检查无法确认。在第二种评估方法中,通过测试轮-板接触力得到的相位角值与测试台中测量的力分析得到的相位角值存在明显差异。因此,对台板惯性力值的修正意义重大。没有修正的值更悲观,尽管在测试车辆的条件下是不合理的。文中引用的著作描述了相角评估方法的几个实际缺陷。作者指出了进一步研究的重要性,使用非线性模型和对所获得的仿真结果进行必要的实验验证是非常困难的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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