Method and apparatus for monitoring multiple points on a vibrating structure

摘要: An apparatus for monitoring a vibrating structure uses multiple motion sensors (10, 12, 14) spaced along the structure, each sensor produces an analog signal which is filtered in anti-aliasing filters (34, 38, 42, 46, 50, 54) to remove substantially all frequency components above selected cutoff frequency. The are connected addressed inputs of multiplexer (72, 76, 78) multiplexes signals response channel address clock (100) repeatedly generates sequence addresses scan input channels. complete repeated at least twice obtain simultaneous samples from sensors. multiplexed then converted digital form (106) and stored (140). preferably also includes fast Fourier transform processor (142) convert data domain means calculating mode shapes data.