| The separation guide mechanism is an important structure of the multistage carrier rocket.Its role is to control the direction of the rocket being thrown away and avoid collision between separate bodies.Therefore,the separation guide mechanism is crucial for the stage separation of multistage carrier rocket,and its performance directly affects the result of separation movement.In this paper,a motion simulation platform was designed to test the performance of the separation guide mechanism.The mechanical analysis of each major part of the platform was carried out.Then the reliability and fatigue characteristics of important parts are analyzed.Finally,the function and reliability has been verified through the physical tests.The main research contents are as follows:First of all,the design scheme of the platform is given after analyzing the working principle of the separation guide mechanism.Then the overall structure of the platform were designed in detail according to the design requirements.Its structure mainly includes the support frame,the linear module,the clamping ring assembly and buffer devices,and each of these structures were described in detail.Secondly,the mechanical analysis of the platform structure was carried out.Using ADAMS simulation software to analyze the motion components of the platform,the simulation results verify the feasibility of the mechanism.Using ANSYS Workbench for static analysis,the stress and deformation of the supporting frame structure and the linear structure of the module under certain working load were obtained.The analysis results show that the structure has high strength and rigidity.Then,the dynamic characteristics of the main structure were analyzed and the natural frequency and mode shapes of the support structure and some parts of the linear module were obtained.Based on this,the harmonic response analysis was carried out.The results show that the designed structure meet the strength and stiffness requirements.After that,the reliability analysis and fatigue characteristics analysis of the main structure were carried out.Based on the distribution of material property parameters,the reliability analysis of the support structure is carried out by the response surface method,and the sensitivity and reliability are obtained.The analysis results show that the support Frame structure has a high degree of reliability.Then,the fatigue analysis of the drive shaft and the driven shaft was carried out,and the fatigue life and safety coefficient of the shafts were obtained.The analysis results show that these structures have longer service life and higher safety factor.The reliability of the structure was verified through the reliability analysis and fatigue analysis.Finally,according to the structural model,a real object of the motion simulation platform for the separation guide mechanism was produced,and a physical test was carried out.According to the working conditions and load conditions that may be encountered during the operation of the separation guide mechanism,four sets of tests were conducted and the test data such as displacement,stress and friction of the separate guide mechanism under different conditions were obtained.The test data was summarized and analyzed,the experiment shows that the platform has the function of simulating many kinds of working conditions and the structure is reliable. |
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