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测量的目的是评价新设计无回弹力风铲(B型)是否能有效地降低振动性白指的危险性,并和原来机型(A型)作个比较。测试时将加速度计(B&K.4339)输出信号馈入积分器(B&K.ZR0020)、倍频程分析器和强度级记录器。分析从倍频带中心频率4赫到2K赫的频谱,只要30秒的操作就可以直接完成。如果做不到时,就用FM磁带记录器记录,把磁带拼接成环状进行分析。分析中发现带环的接头对所需要的低频频带的干扰比对声频频带干扰要大得多。如果积分器用速度档,则磁带环分析可获得最佳“讯号——接点”比,把测试结果再以计算的方法换算成加速度。未预料到的困难是2K赫以上的高强度级振动
The purpose of the measurement is to evaluate whether the newly designed non-resilient wind shovel (type B) can effectively reduce the risk of white vibrating fingers and compare them to the original type (type A). The accelerometer (B & K.4339) output signal was fed to the integrator (B & K.ZR0020), octave analyzer and intensity logger during the test. Analyzing the frequency spectrum from 4Hz to 2kHz in the center of the octave can be done as long as 30 seconds. If you can not do that, use the FM tape recorder to record the tapes in a loop for analysis. It was found in the analysis that the ring-shaped joint required far more interference to the low frequency band than to the audio frequency band. If the integrator is speed-up, then the tape loop analysis gives you the best “signal-to-contact” ratio, which translates the test results into acceleration using the method of calculation. Unexpected difficulties are high-intensity vibrations above 2KHz