Abstract
To ensure excellent performance of a micro reflective space camera, an integrated main supporting structure (IMSS) combined with a thin-walled tube and a supporting rod structure design is applied in this study. Firstly, this paper covers the design and comparison of the performance of three traditional types of main supporting structures (MSS), including thin-walled cylinder type, rod-supporting type and truss type. Then, an IMSS combined with a thin-walled tube and a supporting rod structure is described. In addition, a multi-objective integrated optimization method which allows automatic modeling, analysis, calculation and optimization is proposed. Further, the influence of the supporting rod angle on the structure performance is studied, the performance of stiffness, deformation and mass is better when the height ratio of the rod-structure and the thin-walled cylinder is 6:1. The IMSS mass is only 0.56 kilograms, that is 11.2 % of the total mass of the payload, and the maximum deformation on the supporting bar is no more than 4.5 nm. Finally, the IMSS performance is analyzed by the finite element method and experimental verification, and the first order frequency is up to 192.7 Hz. The degree of light weight is significantly better than that of the traditional structures. The results of the experiment further prove the stability of the IMSS.
Highlights
In the field of space remote sensing, microwave remote sensing information resources are very scarce
This paper presents an integrated main supporting structure (IMSS) with ultra-lightweight and high stability for a micro space camera with its aperture of 200 mm, while the distance between the primary mirror and the secondary mirror is more than 300 mm, and the mass of the whole camera should be less than 5 kilograms
Since the topology optimization is based on the method of solid isotropic materials with penalization (SIMP), which takes the density of every FEM model element as the optimization variable, the final result given in Fig. 3(b) is shown in the form of a density cloud image
Summary
In the field of space remote sensing, microwave remote sensing information resources are very scarce. The MSS of the OPTIMAL DESIGN OF INTEGRATED MAIN SUPPORTING STRUCTURE WITH ULTRA-LIGHT WEIGHT AND HIGH STABILITY FOR SPACE CAMERA. Compared with the thin-walled cylinder type and rod-support type, the truss supporting structure has higher stiffness ratio and flexible assembly It is widely used in large and medium-sized and multi-axis, coaxial and off-axis space cameras. It aims at the lightweight and dynamic performance of the MSS Such as, Wei Lei studied the relationship between the truss dimensional parameters and the random vibration response for a large off-axis TMA space camera [23]. It is necessary to study a new main support structure to ensure the excellent dynamic and static mechanical properties, ultra-lightweight quality requirements for the space camera. The stability and lightweight design of IMSS is discussed in-depth
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