The Design And Simulation Method Of The Strain Vibration Acceleration Sensor Of The Rocket Launcher

The application of 3D acceleration sensor in practical engineering projects has become more and more extensive over time.Therefore,the research of 3D acceleration sensor has become an important topic.At present,most of the 3D acceleration sensor products developed are piezoresistive and capacitive working principles,and the finished products are processed using MENS technology.Most accelerometers in the structure adopt one-piece elastic structures.There are still many problems that need to be discussed in the study of one-piece three-dimensional acceleration sensor.Because the vehicle rocket is in the process of launching,it usually comes with the bad environment in the short time:the washing of high temperature and high speed gas,shock vibration,strong noise,etc.However,the general acceleration sensor in the market is not fully applicable to rocket launcher,and it is necessary to take relevant measures to be applicable to rocket launcher.Because of the actual situation,it is necessary to test the vibration and force of each part of the rocket.And easy to install disassembly,can more easily test the acceleration of different direction.In this context,a 3D acceleration sensor for rocket launcher is specially designed.In terms of the current 3D acceleration sensor,based on the understanding of its structure characteristics and working principle,this paper designs a one-piece strain 3D acceleration sensor.The elastomer of the sensor chooses the whole structure,a single mass of inertial mass.The processing of elastomer is used in general machining technology,which reduces the production cost to a large extent.The structure and parameters are optimized,and the specific application background can be used to measure the acceleration of rocket launcher.The elastomer design is a key part of sensor design,and its structural parameters have great influence on the static and dynamic characteristics of the sensor.Of elastomer model using finite element method,through the static analysis,concluded that elastomer in various axial acceleration load under the action of stress and strain distribution,to infer the sensor has good linear characteristic.To determine the suitable bridge type bridge,eliminate or reduce coupling to some extent.At the same time,the dynamic characteristics of the model are analyzed,including modal analysis,harmonic response analysis and transient response analysis.The modal analysis results in the first six modes and the natural frequency,while the harmonic response and transient response analysis are the dynamic characteristic curves and interdimensional coupling of the sensor.To calibrate the sensor,the sensitivity and other characteristics of the sensor are obtained by using static and dynamic calibration method respectively.