| Along with the industrial and agricultural production, urban transport, the tourism industry to flourish ,vehicles in China have been increased rapidly in recent years,Vehicle NVH (noise, vibration and irregularity), the issue has become more prominent and has been increasing attention . In modern body design, the design of the car noise has become an important indicator. Vehicle users are also concerned about the performance indicators . At present, In the world Car manufacturers the developed countries have attached great importance to the acoustic design of their products . Acoustic design of the car, in theory analysis, technical measures, the application of a number of exploration projects have achieved some results . However, these achievements are far from being able to meet the requirements of vehicle noise control, the domestic automobile interior noise is generally high. The issue is to enhance the acoustic comfort inside the vehicle for the purpose from the perspective of structural design for the most effective way to reduce vehicle noise .In the automobile industry, the relative to cars and trucks business enterprises, small-scale multi-Bus Enterprises , vehicle manufacturers are generally produced in the body on the Bus Chassis , the difference is outsourcing some of the chassis, Some chassis is a self-made. Buses for large and medium-sized enterprises, it is impossible to devote great efforts to research funding Noise . There are only several enterprises have achieved a certain degree of success about bus noise,such as Zhongtong Group, Yaxing Group, Yutong Group, Suzhou Jinlong. Yaxing Group. However, the study was also limited by the noise of the massive test data, according to data analysis initially identified ways Noise. The situation is not very substantial increase in costs through improved materials, structural improvements to achieve the purpose of noise reduction technology. Finally, it will be verified through testing. JS6128H Yangzhou Yaxing Motor Coach CO.,LTD production is one of the largest highway bus. Since the truck market, its appearance and excellent performance have won the users'acceptance. Grading in the car, because of the car noise exceeding , bus JS6128H is less than 2 large passenger demand according to the "classification and grading operation Bus" (JT/T325-2006) issued by the Ministry. To upgrade the quality of bus achieve given the standard, reducing interior noise as conduct studies on the topic.First, the current issue of the voice of the root causes of noise measurement and analysis methods are described . Noise Control of the basic tenets and principles of the noise control techniques are described. Then, the current standards and methods for detection of noise in the bus are introduced. The mechanism of the main sources of noise and vehicle noise characteristics and noise control measures are elaborated. Then, a account of technical parameters and the basic configuration of bus JS6128H are detailed, interior noise control measures of JS6128H are depicted. In the end, according to detection of vehicle interior noise , noise reduction programs, optimized scheme is put forward, the final results of the implementation is test.Improved bus JS6128H has made satisfaction with the vehicle noise control, the noise has been dropped from 72.2dB (A) to 68.6dB (A) , it basically reaches the bus ratings requirements that the car noise does not exceed 69 dB (A) in the secondary 50KM/H.. In addition, the process of improving cost control should be extremely good, there is no increase in cost, and the complete results still paint a certain extent, the overall effect after the engine positions have greatly improved. Special applied damping rubber for insulation directly reduces the material cost side, it has indirectly reduced the amount after polyputty Road. It also reduces costs for companies in a good and effective way. |
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