Model parameters of the nonlinear stiffness of the vibrator-ground contact determined by inversion of vibrator accelerometer data

摘要: Analysis of vibroseis data shows that harmonic distortion in the ground-force signal may exceed primary distortions hydraulic system. This can be explained by baseplate-ground contact nonlinearity created deformations roughness. We separated nonlinear generated hydraulics from at contact. then formulated an inverse problem for resolving parameters rigidity, based on equivalent model source and comparison predicted observed levels. The was solved models bilinear with rigidity smoothly varying between two asymptotic values, using obtained sandy soil. Rigidities changing approximately 10 9 N/m compression 6 8 tension were resolved inversion both models, although smooth nonlinear-rigidity is a better approximation. analysis adequacy mechanical used description nolinear real soil-baseplate coupled systems.