Fatigue Reliability Analysis and Parameters Optimum Design of the Vibroseis Baseplates

Baseplate is a key component of the oil and gas geophysical vibroseis, not only suffered the weight of the vibrator, but also withstands the frequency alternating excitation force generated by the vibrator. Due to exceeding loading, the welded baseplate would be generated cracks, this failure vastly reduces the baseplate fatigue life and precision of the signal excitation. Therefore, this paper constructs a vibrator-geodetic high-frequency coupled vibration mechanics model, obtains the calculation method and load-bearing law of the plate output force, and develops the orthogonal experimental design to construct the simulation experiment sample points, a numerical model of plate fatigue damage mechanics is established based on response surface method, the fatigue reliability and sensitivity of the plate are analyzed, and the parameters of the fatigue reliability of the plate are optimized. The results show that below cross column diameter D is the key factor affecting the fatigue reliability of the plate, after the optimized design, the fatigue life of the plate is obviously prolonged. Research results provide useful information on the importance of fatigue reliability, so guiding new designs will result in longer vibroseis life, higher quality and precision working conditions, and ultimately improved geophysics exploration accuracy.