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机车(轨道车)在城区限制鸣笛条件下,有效利用和改善非制式电笛指向性是提高机车可见性的手段之一。作者根据城区典型道口的背景噪声调查及相关标准要求,确定了道口安全环保的声学条件,并通过对非制式电笛指向性的实验测试和分析,提出该非制式电笛存在指向性不理想、示警距离不足的问题。在此基础上优化试制了新型非制式电笛,并在静态和动态条件下,对其指向性进行了实验测试与分析。结果表明,在安全示警的条件下,新型非制式电笛的指向性得到有效改善,能够满足环保和安全示警的双重要求。
Locomotive (railcar) Under the restriction of the whistle in urban areas, the effective use and improvement of non-standard pipe-whistle-making is one of the means to improve locomotive visibility. Based on the background noise investigation and the related standard requirements of the typical crossings in urban areas, the author determines the acoustic conditions of safety and environmental protection at the crossing. Based on the experimental testing and analysis of the directivity of non-standard electric flutes, the author proposes that the non- The problem of insufficient alert distance. On this basis, a new type of non-standard electric flute was optimized and trial-produced, and its directivity was experimentally tested and analyzed under static and dynamic conditions. The results show that under the condition of safety warning, the directivity of the new non-standard electric flute can be effectively improved, which can meet the dual requirements of environmental protection and safety warning.