Research On Transmission Characteristics Of Harmonic Drive On Satellite Antenna Considered Thermal Environment

The satallite antenna driving mechanisms play an important role in tracking signal for space vehicle. With the development of satellite projects, harmonic drive is widely used in satallite antenna driven mechanism. When Satellite is working in orbit, the harmonic components are exposed to space thermal environment. Therefore, thermal deformation and stress are occurred and seriously affect harmonic drive characteristics. Considering the above situation, harmonic drive performance working in space need be researched. At present, few characteristics of harmonic drive considered thermal environment are studied. Thus, in this paper, harmonic drive analysis model is established. Then, the temperature field of satallite antenna driven mechanism considered space thermal environment is analyzed and harmonic drive characteristics are researched. These can provide theoretical reference for the analysis of harmonic drive. These researching results have important academic value and application value.According to the complicated space thermal environment, the temperature field of driven mechanism working in space is established based on the fourier heat transfer law and the first law of thermodynamics. The space temperature field parameters of driven mechanism are described and the space temperature fields of driven mechanism running in shadow area and facing to the sun are analyzed. Then, the temperature field of harmonic drive is studied.In order to research the stress-strain rules of flexible gear. On based of harmonic drive basic theory and the hollow cylinder theory, stress-strain mathematical model of flexible gear are established. After that, thermal-structural coupling mathematical model is described on based of thermoelasticity and principle of virtual displacement. Then, the stress-strain distribution of flexible gear runing freely is studied, including stresses variation of flexible gear risky sections, deformation rules of middle section and flexible gear barrel. The reasonability of the mathematical model is verified by the analyzing results. Furthermore, the stress-strain distributions of flexible gear suffering from various torque and space thermal environment are researched, including stresses variation of flexible and deformation rules of flexible gear barrel. The transmission performances of harmonic drive have significant effects on satallite antenna driven mechanism. Transmission efficiency and transmission retrace tolerance are the key parameters describing transmission performance. For the purpose of researching on the transmission performance of harmonic drive, the method of calculating transmission efficiency and transmission retrace tolerance is analyzed. Then, Transmission efficiency and transmission retrace tolerance of harmonic drive are calculated considering thermal load, and the changing rules are obtained. In conclusion, the ideas and methods studing harmonic drive characteristics considering thermal environment have important engineering significance.