压缩机噪声测量怎么实现？求教
小弟最近要做一个汽车空调压缩机的噪声采集装置，想找一种较易实现而且价格要求较低的实现方法。可是过去没接触过，老板要的又急。现在考虑用声级计和声卡的方式实现，不知道这样组建系统，精确度如何。还有压缩机的转速最大为8000转，那么声级计选什么样的呢，采样频率取多大合适呢？谢谢呵！ 声级计直接读出 声压级，谈不上采样。应该是 传声器，它可以转换为点信号，但是要想用声卡，还需要自己编程解决接口的问题，可能比较复杂。
采样频率一般在实测时候，通过试测再调整。 传声器就是话筒吧，但使用这个会不会产生过大的噪声呢？如果要用，是不是要加滤波，那滤掉那一部分合适呢？
给你推荐一个USB式四通道便携式噪声测量系统，
你用声级计只能测量1/n 倍频程，但是后续的分析如声强，声功率你实现不了，推荐你用一套m+p的USB式 便携式声学测量系统，Ultra-Portable, USB-Powered Real-Time Analyzer Equipped with a 24-bit four-channel USB powered dynamic acquisition module, the SO AnalyzerUSB4 is the perfect engineering tool for portable noise and vibrationapplications. It provides highly accurate measurements from audiofrequency IEPE (ICP) sensors and all the functionality you need foryour daily test job at a surprisingly low price.http://www.mpihome.com/images/usb_small_lightblue.jpg
Thanksto its self-powered USB 2.0 hi-speed connectivity to a host PC or alaptop, the SO Analyzer is a compact real-time analyzer designed forprofessional applications in the field and in the laboratory.Measurements have never been so easy: Load the SO software, connect theUSB cable between the acquisition module and the host PC/laptop andstart your measurement using ICP® sensors powered direct from the USBfront-end. With 25 kHz bandwidth, 24-bit resolution and 102 dB dynamicrange, the SO Analyzer offers very high precision on four channels andupwards and is perfectly suited for versatile N&V measurements andanalyses.
Applications:
Portable andstationary multi-channel noise and vibration measurements as well asonline and offline analysis in the time and frequency domain in theautomotive, the aerospace, military and other industrial environments.
SO Analyzer USB4 Specifications:
[*]4 simultaneously sampled inputs (expandable with multiple USB modules), +/- 5 V input range[*]USB 2.0 hi-speed[*] 24-bit resolution[*]102 dB dynamic range[*] ICP® support (accelerometers and microphones)[*]50 kS/s maximum sampling rate[*]25 kHz bandwidth[*]Real-time data acquisition, analysis and reporting in one package[*]Continuous or triggered measurements[*]Online real-time FFT[*]Online display of spectrum, PSD, FRF, etc.[*]Online waterfall displays[*]MS Windows like user interface, wizards[*]Automated ActiveX reporting to Microsoft Windows and PowerPoint[*]Expandable to 32 channels with NI CDAQ-9172 chassis
Options:[*]Advanced reporting wizard for larger reports[*] Advanced calculator and user programming (Visual Basic)[*] Throughput to disc acquisition (time recorder), replacing conventional tape recorders[*] Offline post-processing analysis (spectrum, PSD, FRF, etc.) of measured or imported data[*] Modal analysis (ODS, SDOF, MDOF)[*]Online and offline rotating machinery analysis with tacho inputs for order analysis,
RPM spectral mapping etc.[*]Online and offline real-time octave analysis[*]Acoustic intensity analysis[*]Shock response analysis 确实用声级计是没用的，只能读一个声压级而已
而且最精密的声级计好象也在二级(1.1dB)
选套系统啦，B&K的软件和硬件都比较权威
采样频率可以上四万八 采用一般测试仪器的就可以了。
毕竟要求也不是很高，再说了 测试设备也比较简单吧。 法国01dB振动噪声检测系统，用symphonie采集数据有相配分析软件包实时分析和检测 买一台爱华的AWA5661型声级计,买时向销售经理要求加做一根到计算机声卡的交流输出线.声卡的采集频率设到48000kHz.最好用外置USB声卡.采集到数据的精度还可以,最主要是你后续处理软件的精度. 原帖由 jqsk 于 2007-8-21 09:21 发表 http://chinavib.com/forum/images/common/back.gif
确实用声级计是没用的，只能读一个声压级而已
而且最精密的声级计好象也在二级(1.1dB)
选套系统啦，B&K的软件和硬件都比较权威
采样频率可以上四万八
声级计的精度做到一级一点问题都没有,利用声级计的交流输出送到声卡中确实可以进行分析.
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