Design And Research Of Mobile Submersible Deep-sea Seismic Recording System

In view of the lack of seismic observation stations in marine areas at home and abroad,this article designs and research a mobile submarine deep-sea receiving system for global marine applications,which can autonomously dive to a certain depth range of ocean profile for long-term hovering,aiming at low cost and Large-scale obtain natural seismic longitudinal wave signals and transmit them to the monitoring center in near real time.It is required that in a complex marine environment,the device can achieve low-resistance and high-efficiency spatial movement on the basis of satisfying pressure,water tightness,load and speed.Focusing on the research on the structure design,control system and performance optimization of the submersible deep-sea seismometer,the following aspects are mainly completed:1.Determine the overall plan of the Deep-sea seismometer.According to the design index,the structural characteristics and mechanical properties of different ballast materials are discussed.Combining with the strength check theory and use conditions,the overall structure,dynamic system,control and communication methods of the deep-sea seismometer are designed and optimized.Furthermore,each functional component was modularly installed.2.Design a hydraulic drive system.According to the principle of buoyancy regulation,the constraint conditions between the net buoyancy regulation amount and the density change caused by sea depth,the operating speed of buoy submergence,and the communication requirements of surface data transmission are established.In addition,through the simulation of the high-pressure oil drain branch,the rule of the motor drive device with the depth of the sea was obtained,and the best way to adapt the hydraulic drive and the power consumption of the propulsion was proposed.3.Carry out hydrodynamic force simulation.Computational fluid dynamics software and model tests are used to calculate and predict the hydrodynamic parameters of the deep-sea seismograph.Complete kinematics and dynamics models were established during the process of diving and ascent,and the accuracy of the simulation parameters was verified by combining the test data.4.Establish a human-machine exchange platform.The host computer operating platform is constructed based on Qt,including functions such as status display,mode switching,and graphics drawing.The purpose is to accurately control the sensor signals of each part,and ultimately enable the entire system to achieve a low-power consumption strategy.5.Test the performance of the prototype.The test results on various occasions show that the buoyancy adjustment system has the necessary feasibility and safety in the power application of the 2000 m class small submersible.Counting the power consumption of a single operating profile,the power consumption of high-pressure oil discharge can be reduced by nearly 20%.The theoretical calculation of the motor torque is close to the simulation results.The neutral hovering algorithm can ensure the safe and effective acquisition of data information in unstable environments.