In this paper, the effects of uncertain factors in the thermistor pasting technology are researched using parameter sensitivity analysis method. The relevance between thickness of electrical insulating tape, contact interface area, thermal contact conductance and thermal time constant is analyzed, and sensitivity classification of uncertain factors is done by the absolute/relative variation of thermal time constant. Research shows that 1) thickness of electrical insulating tape dPI and thermal contact conductance ht are the insensitive parameters about thermal time constant in the surface pasting technology, relative sensitivity indexes are 0.169[s0.5/μm0.5] and 0.292[m·s0.5·K0.5/W0.5] respectively; 2) contact interface area At is the sensitive parameter about thermal time constant in the surface pasting technology, absolute variation and relative sensitivity index is 124.6s and 3.530[s0.5/mm] separately; 3) in addition to the high-precision calibration, filtering the sensitive-bead size and contact interface area strictly are also critical for improving the real-time measurement accuracy and temperature-changing response speed of thermistors.
For large space telescopes, the design of lightweight primary mirrors with an acceptable level of optical performance is a challenge. A parametric optimization method based on topology optimization of the basic configuration of the mirror is proposed. A finite-element model of the mirror is generated with linear shell elements, and the optimal distribution of the material is obtained using the continuum topology optimization technique. The lightweight ribs are grouped according to the results of topology optimization results. The design of experiment method is used to pick out the key factors for parametric optimization. The RMS value of the surface shape error of the mirror and the total mass of the mirror are treated as the objective merit functions, and the first-order natural frequency of the mirror is taken as a constraint for parametric optimization. Results show that the local stiffness of the mirror is significantly affected by the thicknesses of the ribs at the corresponding positions. The optimum mirror design obtained using our optimization method is compared with the initial design, and the comparison shows superior optical performance for the optimized mirror.
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