Introducing the theory and application of boundary element method on the sound radiation , giving the process of solving vibration noise radiation problem using boundary element analysis software ; presenting the coupling theory and the combination analysis of finite element method and boundary element method , and doing relevant analysis based on close drum shell ; programming the noise data simulation program using the numerical calculation software , simulating the acoustic and pressure data of a key point in the transient response acoustic field of the close drum shell , realizing the audibility of the noise , using the virtual reality tools to simulate the vibration noise of the drum shell ; combining the finite element method and boundary element method to analyze the vibration noise radiation of some gear box , and completing the whole simulation process of the vibration noise of the gear box 综合介绍了边界元法在声辐射问题上的理论及应用；并给出了运用边界元法分析软件求解振动声辐射问题的过程。阐述了有限元法和边界元法的耦合理论及组合分析方法，并以封闭鼓形薄壳为分析对象进行了相应的分析。利用数字计算软件编制了噪声数据模拟程序，并模拟了通过组合方法分析封闭鼓形薄壳瞬态响应声场而获得一关键点的声压数据，实现声音的可听化，随后通过虚拟现实工具实现了该情形下椭球壳振动噪声的虚拟仿真。
Integrating practical application of noise reduction of rotary piston compressor , the dissertation designs and develops the system of signal collection and analysis to test vibration and noise and analyze structure dynamics . furthermore , the dissertation researches the theory of noise resource , noise reduction and modern signal analysis and solves some problem of theory and practice 论文分析了国内外现代信号分析和空调压缩机的研究现状和发展趋势，论文紧密结合滚动转子压缩机减振降噪研究的实际应用，设计开发出了适用于振动噪声测试、结构动力学分析的信号采集处理分析系统，对滚动转子压缩机的噪声源识别和减振降噪机理及现代信号分析技术进行了深入系统的研究，取得了实效。
Production and processing equipment : bearing production equipment , the ball processing equipment , bearing cleaning equipment , packaging equipment bearings , needle roller processing equipment , light jewelry processing equipment , spherical roller processing equipment , rough processing equipment , double - end grinders , spindle , wheel oilstone and other grinding materials , heat production , high - precision coordinates grinder , and outside grinder , seal marking machine , profilometry , contour dynamic analysis , hardness needle - sorting machine , a round instrument , processing tester , processing meter , dynamic vibration and noise analysis , vibration , noise testing device raceway ultra - precision instrument , roughness measuring instrument , the finish detector , sorting machine , converters and bearing products preservatives , lubricants , cleaning agents , such as processing raw materials 生产及加工设备：轴承生产设备球加工设备轴承清洗设备轴承包装设备滚针加工设备光饰加工设备球面滚子加工设备毛坯加工设备双端面磨床电主轴砂轮油石和其他研磨材料热处理生产高精度坐标磨床内外圆磨床印子打标机轮廓测量仪轮廓动态分析仪硬度针分选机圆度仪加工测试仪加工测量仪振动噪声动态分析仪震动噪声测试装置滚道超精仪粗糙度测量仪光洁度检测仪分选机变频器及轴承产品防腐剂润滑剂清洗剂加工原材料等。
The testing platform integrates the measurement of transmission , vibration and noise as well as the rotor . through the experiments , the students will have deeper understanding of the knowledge in textbook , and will also grasp some measurement means . so it is multifunctional 此实验台将传动误差测量与振动噪声测量集于一体，同时可完成转子测量，通过作本实验台的实验，学生不仅会对课本上的相关知识有更深入的认识和掌握，并且对相应的测量技术也有所了解，是一台多功能的教学设备。
In addition , instead of portal brake of j93 - 1000b model , the brake device of j93 - 1000c changes into rushing board brake , thus the dependability of braking is consumedly advanced , being convenient to adjust , and the rigidity strengthening of plate design reduces the vibration noises during the working of press . with cast steel as the material of slide , slide weight of j93 - 1000c model is increased 1 thousand kgs than j93 - 1000b model with nodular cast iron as material . plus that the width from front and back of frame upright post of j93 - 1000b model is 750mm , while its 1000mm for j53 - 1000c model , increasing 250mm than the former J93 - 1000c螺杆螺母螺旋副使用寿命及螺杆的刚度也增加刹车装置由原j93 - 1000b型门刹车改为j93 - 1000c推板式刹车，制动可靠性大大提高，而且便于调整，平台设计刚度增强降低了压力机工作中的振动噪声j93 - 1000c型滑块支背材质铸钢j93 - 1000b型的为球墨铸铁而且j93 - 1000c型滑块重量比j93 - 1000b型增加1000公斤， j93 - 1000c型机架立柱前后宽1000毫米比j93 - 1000b型机架立柱前后宽750毫米增加250毫米， j93 - 1000c机身重46 . 8吨， j93 - 1000b整体机身重38 . 5吨。
This dissertation aims at the problem of the noise of over length truck falling short of the lately country standard , and makes research on the reason of the gear - box vibrating noise . by combine using finite element analysis and experimental analysis method , the dissertation directly researches the vibrating noise of the gear - box , and takes some availability measures to control vibrating noise from the box surface . by improving the box to reduce its noise , and validate the effect 本文针对一汽超长载重汽车噪声指标不符合国家最新标准的实际问题,对其变速箱振动噪声的产生机理进行深入研究,应用有限元分析与实验分析相结合的方法直接对其进行振动和噪声分析,在此基础上提出控制其振动噪声的有效措施,并通过对其箱体的改进设计,最终达到减振降噪的目的。
After precision validated , the system is used to test and analyze local noise , interior noise , pass - by noise and engine vibration and noise . the results prove that the system is precise and helpful to accurately locate the source of noise and vibration , so it arrives at the requirements of functions and capabilities 系统通过了精度验证，并在实际应用中测量和分析了汽车定置噪声、汽车匀速行驶车内噪声、汽车加速行驶车外噪声和发动机台架振动噪声，结果表明系统测量分析准确，能够准确定位汽车和发动机的声源和振源，达到了预期的功能和性能需求。
The main content of this paper contains : summarizing the foundational theory of vibration and noise , and establishing the analysis and computation flow chart of noise acoustic field of mechanical vibration ; taking a close drum shell as the research object , analyzing its dynamic characteristics and vibration response using finite element method , then going with the structural - acoustic coupling analysis based on the acoustic model analysis of the aerial intracavity of the close drum shell 论文的主要内容包括：对振动和噪声的基础理论进行了概述，并建立了结构振动噪声声场分析计算的流程图。以封闭鼓形薄壳为分析对象，运用有限元法分析了其的动态特性及振动响应；同时在分析了封闭鼓形薄壳空气内腔的声学模态的基础上，对其进行了声固耦合分析；并作了该结构模型的外场声固耦合谐响应分析。
Firstly the dissertation analyses the reason of vibration and noise of the transmission gear and the box , drawing a conclusion that the change of gear mesh rigidity and transmission error are the crucial causation to engender vibration and noise of the gear - box ; the main source of the noise is the syntonic noise in box vibration and noise 本文首先分别分析了变速箱传动齿轮和变速箱箱体的振动噪声产生机理,得知产生变速箱传动齿轮振动噪声的主要因素是轮齿啮合刚度的变化和传动误差的影响;且在变速箱箱体振动噪声中自鸣噪声是汽车变速箱的主要噪声源。
In addition , instead of portal brake of j53 - 1000b model , the brake device of j53 - 1000c altered into rushing board brake , thus the dependability of braking is consumedly advanced , being convenient to adjust , and the rigidity strengthening of plate design reduces the vibration noise during the working of press . with cast steel as material of slide , slide weight of j53 - 1000c model is increased 1 thousand kgs than j53 - 1000b model with nodular cast iron as material . plus that the width from front and back of frame upright post of j53 - 1000b model is 750mm , while its 1000mm for j53 - 1000c model , increasing 250mm than the former J53 - 1000c螺杆螺母螺旋副使用寿命及螺杆的刚度也增加刹车装置由原j53 - 1000b型门刹车改为j53 - 1000c推板式刹车，制动可靠性大大提高，而且便于调整，平台设计刚度增强降低了压力机工作中的振动噪声j53 - 1000c型滑块支背材质铸钢j53 - 1000b型的为球墨铸铁而且j53 - 1000c型滑块重量比j53 - 1000b型增加1000公斤， j53 - 1000c型机架立柱前后宽1000毫米比j53 - 1000b型机架立柱前后宽750毫米增加250毫米， j53 - 1000c机身重46 . 8吨， j53 - 1000b整体机身重38 . 5吨。
