Abstract: By making use of the analyzing method of digital signal system, the elastic deformation problem of elastic bodies for line contact is regarded as the transmitting process of digital signals, and an equivalent digital signal model of elastic deformation is set up. According to the model, the pressure and elastic deformation in the contact area are the input and output signals, which can be respectively described in time domain and frequency domain. Fast numerical solution for EHL of line contact is realized by using FFT and convolution integral method. It is shown that, under the condition of Hertzian pressure distribution, the calculating amount and the storage space used in the present method are much less than the deformation-matrix method. Moreover, the calculating precision of elastic deformation in the present method is no lower than the deformation-matrix method. So, it can be concluded that the present method can be used in EHL calculation, and worthy to be researched further.

Key words: Calculation of elastic deformation, Convolution algorithm, EHL, FFT