Design optimization of stress isolation groove for off-axis three-reflector based on sensitivity analysis of structural parameters

Le résumé fourni par la source

This study presents a methodical approach for optimizing stress isolation grooves in off-axis three-reflector systems through sensitivity analysis of structural parameters. Findings reveal that groove depth and spacing are critical parameters determining isolation effectiveness, accounting for 54% of performance variability according to Sobol' decomposition indices. Groove depth demonstrates a nonlinear stress reduction relationship with a critical shift occurring at 2.5 mm, while spacing shows an inverse relationship to performance. By integrating local and global sensitivity analyses with multi-objective optimization, an optimal configuration was identified (d=2.75mm, s=4.5mm, t=1.8mm, w=0.65mm, r=0.25mm) that reduces assembly stress by 52% while maintaining eigenfrequencies above 200Hz, improving RMS wavefront error from λ/8 to λ/35. Experimental validation confirms the design's effectiveness, with measured performance (48% stress reduction) closely matching predictions. The optimized design maintains performance across -55°C to +85°C temperature range, with 61% reduced thermal stress sensitivity and 76% reduced stress gradient across the optical aperture. This methodology extends beyond three-reflector systems, offering effective stress management solutions for precision optics under harsh airborne conditions.

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