Structural Design Of The Sealed Cabin Of The Geoacoustic Sensor And Its Response Analysis Under Dynamic Load

Undersea seismic observation is a major livelihood issue which is concerned by all sectors of society.The core tool of undersea seismic observation is the Ocean Bottom Seismometer,the development of Ocean Bottom Seismometer is the key to promote the development of marine seismic observation.In this paper,based on the environment,design requirements and structural dynamics theory,the local and global models of different types of ground acoustic sensors are designed and optimized by using SolidWorks,ANSYS and other numerical modeling analysis software as well as vibration test means.Firstly,the dynamic analysis methods,such as modal analysis,transient dynamic analysis and harmonic response analysis,as well as their own methods,purposes and application conditions are introduced.Then,the influence of the thickness of the shell and the number of grids on the vibration characteristics of the probe in the sealed cabin is studied,and the law of harmonic response analysis in different directions of different nodes is obtained,which is compared with the results of modal analysis;then the natural frequency of different sensor shell models is calculated,and the vibration characteristics of different sensor whole models are analyzed,and the correctness of numerical simulation is verified by experiments nature.At last,the transient dynamic responses of different sensor models under harmonic and natural seismic loads are discussed to verify whether the designed model can measure the vibration signals accurately,and the influence of counterweight plate on the response of different models is also discussed.Ultimately,two kinds of horizontal and vertical geophonic sensor models that meet the design requirements are obtained,among which the horizontal version has better performance,and the change of transfer function is different after adding counterweight plate to different versions of sensor models,and a finite element model and dynamic simulation flow of research geophonic sensor that can be verified by means of experiments are developed.