Research On Mechanical Properties And Dynamic Analysis Of Tape-spring Unfolding Mechanism

In recent years,the structure of spacecraft has become increasingly complex and large-scale.As a result,space deployable structures have emerged and developed rapidly.Among them,the deployment hinge,as a core functional component,has an important influence on the deployment process and the deployment state,which directly determines the unfolding driving performance and locking stability of the mechanism.In recent years,a kind of hyperelastic hinge mechanism based on spring structure has been gradually applied to aerospace engineering.Its simple structure,high reliability,low manufacturing cost,and self-locking have become a research hotspot in the field of space deployable mechanisms.However,its mechanical properties are complex,which are related to many factors such as material,structure,mechanism,and gravity field.In order to clarify the key factors affecting the performance of hyperelastic hinge mechanism,accurately predict its deployment process,ensure the stability and reliability of the deployment,and support the design of the hyperelastic hinge mechanism in the future,this paper systematically carried out the stability analysis of the locked state,quasi-static unfolding performance analysis and dynamic analysis of the unfolding process of spring hyperelastic hinge mechanism.Firstly,the quasi-static mechanical simulation analysis and experimental verification are carried out for the quasi-static bending problem of hyperelastic single tape-spring hinge;The finite element analysis model of the single tape spring structure was established,and the corresponding experimental analysis platform was built to analyze the structure torque performance;The comparison of simulation and experimental results shows that the established simulation model is accurate and reliable.On this basis,the influence of the geometrical parameters of the tape-spring structure on the structure performance of the single tape spring is studied.The results show that the equal-sense bending process of the single tape spring structure has greater peak moment and steady-state moment than the opposite-sense bending process,and the section arc length and section thickness of tape spring have a positive correlation with the structural torque performance.The length of the tape spring only has a significant impact on the peak torque under the opposite-sense bending state.Then,the locking state stability,quasi-static unfolding performance and dynamic performance of the hyperelastic hinge mechanism under different spring configurations are studied.;Based on the two methods of experiment and simulation,the performance of the dual-band spring opposite and back design was compared and analyzed.The results show that:(1)The finite element analysis method can accurately simulate the experimental analysis process,and the calculated results are consistent with the experimental results,which can be used as a research method for the unfolding dynamics of complex structures;(2)Under the condition of consistent geometric parameters,the opposed double-leaf spring structure has higher stability than the back double-leaf spring structure in the locking state,which can provide greater deployment driving torque,relatively small overshoot during the deployment process,and can self-lock more quickly and reach a steady state.Finally,with the "Tianwen-1" Mars rover foldable antenna as the background,based on the aforementioned analysis conclusions,a deployable locking mechanism with opposed double-spring hyperelastic hinges was designed,and its nonlinear unfolding dynamics were studied.The Abaqus statics analysis method is used to eliminate the influence of the redundant kinetic energy of the system,and the retracting state of the flexed antenna with spring is simulated.Based on the analysis of practical engineering tasks,a variety of gravitational field conditions were designed,and the nonlinear mechanical characteristics of hyperelastic hinges were fully considered.Based on the Abaqus explicit dynamics analysis module,the "spring-rod" structure of the folded antenna was designed.The dynamic response during the deploying process was analyzed.The results show that the use of the mechanism with spring hinges can realize the rapid expansion and stable self-locking of the folding mechanism;The nonlinear bending-torsion coupling phenomenon with spring during the unfolding process will become more severe with the increase of gravity acceleration;The impact load caused by structural locking will not cause structural damage.;The folding mechanism with spring designed in this paper is reasonable and feasible.