The analysis of influence of vibration source intensity estimation using new and old weight-ing factors:Take Nanjing Subway as an example
The weighing factor plays an important role in the calculation of the Maximum Z-Vibration Level(VL-zmax)which is a core indicator for evaluating environmental vibration.At present,however,due to the lag of updating some standard documents,there exists the coexistence of old and new weighting standards in our country.First,a new method for computing the VLz by weighted acceleration based on the Fast Fourier Transform(FFT)is proposed in this paper.Then,to study the influence of different weighting standards on the source strength evaluation of the Nanjing metro,the maximum Z-vibration levels are calculated based on the new and old weighting factors,respectively,using the measured data under different vehicles,different metro lines and different shock absorptions.
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