Improve vibrator structure to eliminate vibration noise

• 作 者: Jin-juan JIANG Xiang YU Jing Zhang Ren-cai ZHANG
• 机 构: Beijing Key Laboratory of Material Utilization of Non-Metallic Mineral and Solid Waste, School ofMat
• 出 处: 第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
• 发表日期: 2016年4期
• 关键词: vibroseis vibrator horizontal interference force output force noise

　　In seismic exploration of vibroseis, the vibrator is a unique way to tran mit the scanning signal into the underground stratum, and the magnitude of the vibrator output force directly determines the energy of useful signals in seismic waves. Seismic waves collected by detectors often contain many kinds of noises, and the vibration noise is an important one. This work attempts to eliminate the vibration noise by means of improving the structure of the vibrator, under the premise of maintaining the energy of useful signals. The structure analysis of existing piston vibrators shows that, the hydraulic oil dusts are set at one side of the hammer; in case that high pressure oil goes into the oil dust, a horizontal torque applied upon the hammer lets the hammer shook in the process of vibration, and bring the noise. Force analysis of vibrator shows that, the torque on the hammer leads to a horizontal force on the four pillars, and makes the actual output force decrease due to an increased friction. Simplified model is established for solving the strain of the vibrator under the disturbing force by using ANSYS finite element analysis software; the simulation results show that the pillars will bend under the horizontal disturbance force; the deformation will increase the resistance during the vertical vibration, and affect the output force. The structure of the vibrator is improved by setting the hydraulic oil dust in the piston rod which does not vibrate with the hammer. In this way, the hammer of the improved vibrator has the symmetrical structure on the both sides, and the high pressure oil will not produce horizontal interference force on the hammer an more, as well as no deformation phen menon on pillars confirmed in the finite element analysis. In the vibration experiment of the improved vibrator, the acceleration sensor is used to measure the acceleration of base-plate; the calculation results show that, the gap between the vibrator output force and the theory output force is reduced in evidence.