内噪声

• Applying transfer - ratio concept to the research on vehicle interior noise and analyzing the effect of each shock absorber from the statistics theory and vibration energy . then this thesis validates the feasibility of this method by programming and analyzing on the data in test
  成功地将传递率的概念引入到汽车车内噪声传递路径分析之中，从振动能量的角度分析汽车各部位减振效果，并通过编程对试验数据的分析验证了该方法的可行性。
• On the basis of the promotion of the noise control standard in vehicles , using the domestic and international recent research result of active noise control , combining the vehicles own characteristics , this article explains in detail the research of active noise control utilizing the piezoelectric ceramic in vehicles , and discusses the collocation method of piezoelectric and the control strategy of neural network . according to the acoustics mode
  摘要基于国内对汽车车内噪声控制标准的提升，运用目前国内外对噪声主动控制方面的研究成果，结合汽车本身的特点，利用压电陶瓷对车内噪声进行主动控制的研究。
• Anyhow , if the coach manufacturers should aim to low noise through the reasonable vehicle shape and construction , low noise chassis components , simultaneously , applying sound insulation , absorption . vibration absorption technology for the different noise source on the scientific and economical principle . thus the noise in the coach can be controlled effectively
  总之，如果客车制造商把低噪声作为新产品开发目标之一，进行合理的车身外型和结构设计；选装低噪声的底盘部件；同时，在客车的制造过程中，针对不同的声源，根据科学性、先进性、经济性的原则，综合利用隔声、吸声和减振技术，采取相应的措施，就能够有效地控制大型客车车内噪声。
• A high performance receiver with high sensitivity and good antijaming ability has been manufactured . the receiver works at uhf frequence with 5 . 1mhz bandwidth , noise figure lower than 0 . 5db , gain more than 20db , and rejection more than 60db outside of the bands . the receiver consists of the htsc filter , low noise amplifier working at low temperature ( 77k ) and the cooler
  该前端系统工作在uhf频段,工作带宽5 . 1mhz ,带内噪声系数小于0 . 5db ,带内增益大于20db ,带外抑制大于60db ;不仅具有很高的灵敏度,而且具有很强的抗干扰能力;主要由高性能的超导滤波器、低温低噪声放大器及制冷系统三部分组成。
• So a new method is proposed that combines the traditional transfer function and coherence function analysis with the statistics of frequencies to obtain the dominant frequencies , which can reflect how the noise sources influence the bus interior noise level in frequency domain , and which will provide reliable references to make up plans in reducing the bus interior noise
  对此提出了在传统的传递函数和相干函数分析的基础上结合频率统计，选出优势频率的方法来考察噪声源对车内噪声的影响，为制定客车车内噪声治理方案提供了可靠的依据。
• In the paper , through measurements of interior noise of existing railway vehicles in china , studies propagation routes and distributing characteristics , puts forward to the distributing rules of interior noise in different statuses and speeds , gets the main frequency band , it benefits to noise abatement and reduction design of existing and high - speed railway vehicles
  摘要运用多通道噪声测试与分析系统，对运行中的铁路客车进行了多点同步车内噪声测试和分析，得出了在不同工况和不同运行速度时的车内噪声的现状和分布规律，确定出车内噪声发生的主频带，对既有线铁道车辆和将来的高速铁道车辆进行防噪降噪设计具有较高的参考价值。
• 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。
• This article firstly deal with the sound source , noise measurement and analysis , noise control principle and some basic noise control technology , then elaborate the current noise detection standard and method for the coach in our country , the noise mechanism . characteristics and the measures of noise - controlling , finally . describe the actions of noise control , noise detection and optimization in our coach detailedly , which have met with the expectation
  本文首先叙述了声音的产生原因、噪声的度量和分析方法；介绍了噪声的控制原理和原则以及一些基本的噪声控制方法。然后，介绍了我国目前的客车车内噪声的检测标准和方法；详细阐述了客车主要噪声源的产生机理和噪声特性以及车内噪声控制措施；最后，理论与实际相结合，对我公司的lck6122型大型客车采取了相应的噪声控制措施以及并其进行了测试和优化。