Research On Large-scale Sonar Heat Dissipation And Vibration Damping Technology Of Distant-water Fishing Vessels

The fishing sonar is a equipment used on ocean-going fishing vessels.Affected by the harsh environment of the ocean,it faces high temperature,high humidity,vibration and other effects,which seriously affects the reliability of the sonar host.This topic summarizes the development process of fishery sonar,the research status and development trend of thermodynamics of electronic equipment at home and abroad,and puts forward the research content and technical route of this thesis.Use CAD and CAE software to establish a three-dimensional model and finite element model of the prototype.In order to solve the heat dissipation problem faced by multi-beam fishing sonar hosts when working in high-temperature and high humidity environments of ocean-going fishing vessels,this study starts from the heat dissipation analysis of multi-beam fishing sonar hosts,and uses the relevant theories of heat transfer and structural design to design the fishing sonar host.First of all,the whole heat dissipation process of fishing sonar is analyzed with the system analysis method and targeted heat dissipation suggestions are put forward.Secondly,the thermal simulation software is used to simulate the heat dissipation process of the sonar host,optimize the air duct design and takes the design of the four air ducts as the heat dissipation scheme of the sonar host,selectsipation fans that meet the heat dissipation requirements of the sonar host,and simulate the performance of the heat dissipation capacity of the sonar host at ambient temperatures at 20°C,30°C,40°C and 50°C.The temperature rise of the sonar host is controlled within 25°C.The temperature distribution before and after the heat design of the sonar host is compared,it is found that the internal stability of the sonar host has been effectively controlled by effectively controlled by heat accumulation.In order to verify the real heat dissipation ability of the sonar host,a heat dissipation test platform for the sonar host has been built.Through the heat dissipation test results,the heat dissipation capacity of the hot-designed fishing sonar host has been greatly improved.The temperature rise of the sonar host is controlled within 25°C,and the temperature between each plates and cards is controlled within 5°C.The simulation analysis results are verified.A low-heat resistance channel has been formed between the heat source and the external environment of the host,which improves the working stability of the sonar host,and provides solutions and theoretical analysis methods for the normal operation of the sonar host in the high temperature and high humidity environment of ocean-going fishing boats.Aiming at the vibration problem faced by the sonar host in the harsh environment of oceangoing fishing vessels,this study starts from the source of the vibration suffered by the sonar host and uses the theory of ship vibration and structural dynamics to clarify the installation location of the sonar host on ocean-going fishing vessels and the solution of installing vibration isolators.First of all,through the analysis of the vibration source on the ocean-going fishing vessel and the study of the vibration frequency on the fishing vessel,the approximate installation position of the sonar host on the fishing vessel is determined to reduce the fatigue of materials caused by long-term vibration,and avoid the damage of the mainframe structure of the mainframe.Then,a finite element model of the sonar host is established.The vibration of the sonar host is simulated and calculated by means of modal analysis,harmonic response analysis.Through the modal analysis of the main engine,the main mode and resonance frequency of the main engine are obtained,the displacement of each monitoring points of the host at each resonance frequency is obtained through harmonic response analysis,and the correctness of the resonance frequency under modal analysis is verified.The research results provide a theoretical basis for sonar hosts to reduce vibration on fishing vessels and avoid damage caused by resonance.In order to verify the function and performance of the sonar host and carry out lake testing and offshore testing,the structural scheme design and specific application methods of the sonar host can effectively prevent the interference and destruction of the internal equipment of the sonar host in the harsh environment and ensure the stable operation of the sonar system.Achieving the expected effect provides a realistic basis for the reliability of the sonar host and meets the corresponding design requirements and standard specifications.It has corresponding guiding significance for the reliability research and design of similar ship equipment.