Type synthesis method of high-precision double-layer parallel pointing mechanism

The space pointing mechanism is widely used in radio astronomy, aerospace and other fields, and has high requirements for its pointing accuracy and stability. The pointing mechanism will be affected by external interference when it works. In order to eliminate the influence of interference force and interference torque on the output accuracy of the pointing mechanism, it is necessary to propose a novel method of type synthesis of high-precision double-layer parallel pointing mechanism which can resist interference force and interference torque. A series of high-precision double-layer parallel pointing mechanisms that can resist interference forces and interference torques have been synthesized. Firstly, based on the idea of decoupling the function of pose adjustment and the function of resisting interference force and interference torque, a new method of type synthesis of high-precision double-layer parallel pointing mechanism is proposed. The type synthesis conditions of the inner translation mechanism and the outer mechanism are given. Then, based on the type synthesis conditions of the inner translation mechanism, the type synthesis of the inner isotropic three-translation parallel mechanism is carried out. Based on the type synthesis conditions of the outer mechanism, the type synthesis of the six-degree-of-freedom parallel mechanism for high-precision pointing and position adjustment is carried out. A series of new configurations of double-layer parallel pointing mechanisms that can resist interference forces and torques are synthesized. Finally, a typical configuration is selected to verify the correctness of the anti-interference function of the double-layer parallel pointing mechanism. The double-layer parallel pointing mechanism has the advantages of both large load and high output precision, and has a good application prospect in the field of radio telescope and antenna radar.