| Taking the Rigid Clamp Band Connection Device(RCBCD)of launch vehicle as the research object,the thermal-mechanical combination analysis in the process of heating installation and cooling pre-tightening of the RCBCD was studied.The mechanical behavior of RCBCD subjected to the axial loads was investigated.Then the dynamic response during the separation-capture process was analyzed by nonlinear explicit dynamic method.The model was verified by comparison with the experimental results.The static and dynamic factors affecting structural character were discussed,and the section shape optimization was performed to improve the connection stiffness.The conclusions were as follows:1)The thermal and mechanical characteristic were analyzed in the heating installation process of the RCBCD.Based on the system composition and working principle of the RCBCD,the nonlinear finite element model was established;Based on the model,the temperature and stress changes of the RCBCD during installation were analyzed;The influence such as the rigidity of the joint,the interface friction and the installation displacement on the installation force was studied.2)Numerical simulation analysis and experimental research were carried out in the cooling pre-tightening process of the RCBCD,and the results verified the correctness of the numerical simulation analysis.Based on the finite element model established in the second chapter,the influence of the ring’s boundary constraints on the pre-tightening force was studied without considering the installation process;The correctness of the finite element model and simulation analysis method was verified by the experiment;The influence of different installation mode on the heating installation and cooling pre-tightening of RCBCD was proposed and analyzed,and the effect of interface friction on the uniformity of pre-tightening force of the RCBCD was considered.3)Aiming at the axial load state of the RCBCD,the distribution of the mechanical response of the RCBCD is analyzed,and the structure of the RCBCD is optimized.Under the condition of static uniform distribution of constant axial tension,the strength and stiffness characteristics were analyzed in the working condition of the RCBCD subjected to the axial tension.Based on the approximate circumferential symmetry of the RCBCD,the two-dimensional axisymmetric model was established,then the multi-island genetic algorithm was used to optimize the structure of the RCBCD and improve the overall connection performance.4)Aiming at the separation and capture process of the RCBCD,based on the explicit nonlinear dynamic analysis method,the dynamic response analysis of the RCBCD during separation and capture was carried out.The nonlinear dynamic finite element model of RCBCD was established;The separation and capture process of the RCBCD was studied,And the influencing factors in these processes of the RCBCD was conducted;The separation and capture of the RCBCD was further discussed in two additional special separation conditions.The dissertation reveals the mechanical properties and motion of RCBCD star-satellite connection device under the conditions of installation,preloading,bearing and separation-capture.The results can provide technical reference and theoretical basis for the development and application of the RCBCD star-satellite connection device. |
