STRAIN ESTIMATION DEVICE, DIAGNOSIS DEVICE AND STRAIN ESTIMATION METHOD

PROBLEM TO BE SOLVED: To provide a strain estimation device, a diagnosis device and a strain estimation method with which it is possible to acquire strain without using a strain gauge.SOLUTION: A strain estimation device 20 comprises a pressure acquisition unit 22 for acquiring a pressure signal that includes time-series pressure values at a prescribed position around an inducer 2, an estimation unit 24 for estimating a strain signal that includes time-series strain values occurring in the inducer 2 on the basis of the pressure signal, and an output unit 26 for outputting the strain signal. The estimation unit 24 converts the pressure signal to the strain signal using an estimation filter determined on the basis of the power spectral density of pressure and the power spectral density of strain that occurs in the inducer 2 when said pressure is applied to said position.SELECTED DRAWING: Figure 2 【課題】歪みゲージを用いることなく、歪みを取得可能な歪み推定装置、診断装置、及び歪み推定方法を提供すること。【解決手段】歪み推定装置２０は、インデューサ２の周辺の所定の位置における時系列の圧力値を含む圧力信号を取得する圧力取得部２２と、圧力信号に基づいて、インデューサ２に生じる時系列の歪み値を含む歪み信号を推定する推定部２４と、歪み信号を出力する出力部２６と、を備え、推定部２４は、圧力のパワースペクトル密度と当該圧力を上記位置に加えた時にインデューサ２に生じる歪みのパワースペクトル密度とに基づいて決定される推定フィルタを用いて、圧力信号を歪み信号に変換する。【選択図】図２