Thepresent paper presents a design procedure and prototype of detection system, which uses high-precision grating displacement sensor as the main test instrument for detecting bogie wheelset alignment parameters in horizontal plane. Wheelset rim inside distance, wheelbase difference and diagonal difference of newly completed bogie are obtained automatically and accurately in once measurement, moreover, detection is not limited to different bogie wheelbase and different size of wheels. Furthermore, measurement and control system and software are designed; detection results should be saved, queried and printed. The precision of the detecting system could reach to 0.02mm. Compared with foreign similar equipments, the advantages of this detection system is improving the detection accuracy and reducing costs.
Speech intelligibility is one of the most important aspects of the study of sound quality inside vehicle. Speech intelligibility test is the direct approach to decide whether the listening environment inside vehicle is superior or inferior, but it has many short-comings in the process of subjective evaluation which is time-consuming, laborious and difficult of accomplishment. In this article, speech intelligibility index which is an objective evaluation index, is used for analyzing and evaluating the sound quality inside passenger car, and is calculated separately by two methods. By analyzing the factors influencing the speech intelligibility inside vehicle under different conditions, the methods to improve the sound environment are proposed, which can provide a direct significance for improving sound quality inside vehicle.
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