Swing bolster load testing method

Abstract

The invention discloses a swing bolster load testing method. The method comprises the following steps of: 1) machining a centre plate force-measuring seat at a centre plate of a swing bolster, machining a side bearing force-measuring seat at each side bearing of the swing bolster, installing a centre plate force-measuring sensor component and a side bearing force-measuring sensor in the centre plate force-measuring seat and the side bearing force-measuring seat respectively, and installing the swing bolster on a bogie; 2) actually measuring during vehicle operation and acquiring signals measured by the centre plate force-measuring sensor component and the side bearing force-measuring sensor through a signal acquisition device; and 3) calculating a load-time history at the centre plate and the side bearing on the basis of the signals acquired by the signal acquisition device. Because centre plate force, the offset of the centre plate force and side bearing force are obtained in a way of direct measurement, the test precision of the centre plate force can be obviously improved; the steps for calibrating the load in a lab can be reduced; the period of test work is shortened; and human power and material resources are saved.

Description

[0001] This application is a divisional application. The original application was submitted to the Patent Office on February 11, 2009 with the patent number: 200910077441.0 and the invention title: "bolt load test structure and its test method". technical field [0002] The invention relates to a bolster structure of a train. Background technique [0003] Judging from the development of truck equipment technology in my country in the past ten years, the fatigue reliability of truck structure is a key factor restricting the improvement of truck equipment technology. If the fatigue crack occurs prematurely when the structure of the truck is significantly lower than the design life, the maintenance cost of the truck will remain high and the driving safety will be seriously endangered. Because the current structural strength design specifications and test standards for freight cars are not perfect, especially the lack of fatigue strength design specifications and test standards ...

AI Technical Summary

Problems solved by technology

[0011] Although the above-mentioned existing bolster load test methods are widely used in the fatigue reliability analysis of truck structures in my country, however, test workers also found that there is a problem that the test structure is not accurate enough in the process of work. The reasons are:

[0012] 1. Since it is difficult to paste strain gauges directly on the center plate of the bolster, the load value on the center plate can only be indirectly obtained through calibration tests. The process is complicated and there must be errors

[0013] 2. Use the strain gauge to measure the stress value, and obtain the load value by solving the equation, and its measurement accuracy is much lower than that of the load cell

[0014] 3. The strain value obtained by using the strain gauge measurement requires complicated post-work to convert it into the load value we need

[0015] Due to the existence of the above factors, the truck load spectrum obtained by the existing bolster load test method is not accurate enough, and even affects the research work on the fatigue reliability of the truck structure, which has become an urgent problem for those skilled in the art.

Images