VIBRATION CHARACTERISTICS ANALYZER

摘要

PROBLEM TO BE SOLVED: To enhance the identification accuracy even if noise is mixed by an arrangement wherein by reducing the frequency response functions corresponding to intrinsic to the number of intrinsic modes, determining a weighting function while simultaneously taking account of a large number of frequency response functions and applying the weighting function to the sum of residual squares. SOLUTION: The vibration characteristics analyzer comprises a load cell 3 for detecting force, an acceleration sensor 4 and an operating unit 5. The load cell 3 is fixed to an impulse hammer 2 for shaking an object 1. The acceleration sensor 4 is fixed to an arbitrary part of the object 1 in order to measure the response to vibration caused by the impulse hammer 2. The operating unit 5 receives output signals from the load cell 3 and the sensor 4 andydetermines frequency response data and then identifies the mode characteristics by the least squares method for minimizing the sum of the residual squares of the frequency response data and the theoretical value of frequency response function. The operating unit 5 also determines a weighting function while taking account of a large number of frequency response functions simultaneously and applies the weighting function to the sum of residual squares.