Analysis Of Axial Load Of Basic Unit Axial Splicing Of Tensegrity

Tensegrity structure is a space structure composed of flexible strings and rigid bars with certain stability.The bars support the sring members inside,so that the whole structure has a certain stiffness.Structure mainly tensile component design idea is different from traditional design idea,tensegrity structure has many characteristics of the traditional structure does not have,in recent years,both at home and abroad has made a lot of achievements on the study of tensioning structure,the research direction includes:tensegrity robot,space stretching arm and developable antenna structure and other fields.This paper mainly analyzes and studies the load-bearing aspect of the axially spliced structure of the tensile integral basic unit,studies the functional relationship between the structural parameters of the stable configuration,calculates the relative force density of the structural members,analyzes the stability of the deformed structure based on the stable structure,and calculates the structural components.Relative force density,simulate and analyze the stress of each string member when the structure is axially loaded,design a reasonable node structure,and finally make an experimental prototype for load-bearing experiments.Specific research contents include:1.By using the basic element geometry parameters of the tensegrity to describe the spatial positions of the nodes in the stable configuration,analyze the force balance of the nodes and obtain the stable configuration conditions of the basic elements.When the two nodes connected to the same node and the other end of the skew string are in different positions,the relationship between the geometric position of the member and the number p of the bar and the number j of the node at the other end of the skew string is further analyzed,and the unified condition of the stable configuration of the basic element is obtained.2.Using the connection relationship between the bar and the string member to analyze the force of each member of the node,and use the structural stability node balance condition to calculate the functional relationship between the overlap rate k of the basic unit axial splicing,the angle φ of the unit and the angle φ between the units,and verify the function with a physical model derive the correctness.3.When the axial splicing structure of the basic unit is stable,the relative force density of the components in the structure is solved by using the force balance of the nodes,and the force of each component of the structure is analyzed.At the same time,the stability of the deformed structure is analyzed by using the force balance condition of the nodes,and the force of the components of the spliced structure with different shapes is further analyzed.4.The axial load simulation analysis of the spliced structure is carried out,and the axial load is applied to the upper end face of the structure to analyze the force of each string member.Design the node structure connecting the string member and the bar member,and carry out the finite element simulation analysis of the node structure according to the force of each string obtained from the simulation,analyze whether the strength of the node structure meets the experimental requirements,and prepare for the bearing experiment.5.Analyze the connection error of the components during the construction of the prototype,and build the experimental prototype of the over-constrained structure,the experimental prototype of the fully constrained structure and the experimental prototype of the deformed structure.The tensile force sensor and amplifier are used to measure the string force data during the axial load-bearing process of the experimental prototype,and the data is derived and tested.data for analysis.