Finite element analysis and simulation on a kind of 3 axle rotary flexible hinge with high axial rigidity

A kind of 3 axle rotary flexible hinge with high axial rigidity has been studied.Principle and method for carrying out analysis by adopting finite element technique on bending rigidity,torsional rigidity and axial rigidity were put forward.Taking these as a base,the finite element analytical calculation on rigidities of each direction of the 3 axle rotary flexible hinge with high axial rigidity was carried out.The quadratic fitting equation of rigidities in each direction of the 3 axle rotary flexible hinge with high axial rigidity that change along with variations of the key structural parameters of flexible hinge was established.The result of study showed that the 3 axle rotary flexible hinge with high axial rigidity possesses not only the equality in bending rigidities of every direction but also possesses rather high axial rigidity,and could realize rotations in the 3 axles.In addition,the maximum fitting error between the quadratic fitting curve with its rigidity value in various directions that varies along with the variation of key structural parameters and the tested curve would not exceed by 3.50%.The quadratic fitting equation of rigidity in various directions that varies along with the changes of key structural parameters of the flexible hinge could predict accurately rigidities in various directions of the flexible hinge.The research works provided a kind of effective method for the development and design of 3 axle rotary flexible hinge with high axial rigidity.