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Reconfigurable mechanism-based metamaterials for ternary-coded elastic wave polarizers and programmable refraction control
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作者 Zhou HU Zhibo WEI +1 位作者 Yan CHEN Rui ZHU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第7期1225-1242,共18页
Elastic metamaterials with unusual elastic properties offer unprecedented ways to modulate the polarization and propagation of elastic waves.However,most of them rely on the resonant structural components,and thus are... Elastic metamaterials with unusual elastic properties offer unprecedented ways to modulate the polarization and propagation of elastic waves.However,most of them rely on the resonant structural components,and thus are frequency-dependent and unchangeable.Here,we present a reconfigurable 2D mechanism-based metamaterial which possesses transformable and frequency-independent elastic properties.Based on the proposed mechanism-based metamaterial,interesting functionalities,such as ternarycoded elastic wave polarizer and programmable refraction,are demonstrated.Particularly,unique ternary-coded polarizers,with 1-trit polarization filtering and 2-trit polarization separating of longitudinal and transverse waves,are first achieved.Then,the strong anisotropy of the proposed metamaterial is harnessed to realize positive-negative bi-refraction,only-positive refraction,and only-negative refraction.Finally,the wave functions with detailed microstructures are numerically verified. 展开更多
关键词 elastic metamaterial elastic wave reconfigurable design zero mode ternary code programmable refraction
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Design method and vibration testing of a reconfigurable multi-process combined turn-milling machine tool
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作者 范徐笑 张之敬 +2 位作者 金鑫 孙需要 郭娜 《Journal of Beijing Institute of Technology》 EI CAS 2011年第3期351-358,共8页
To provide a good machining method in remanufacturing for the repaired parts with various forms, the design method of reconfigurable multi-process combined machining system and its implementation technology for remanu... To provide a good machining method in remanufacturing for the repaired parts with various forms, the design method of reconfigurable multi-process combined machining system and its implementation technology for remanufacturing are systematically proposed. The key technologies include reconfigurable structure design method of multi-process combined machining, man-machine coordination parameter programming and control system technology with self-maintenance function. A turn-milling machine tool based on this design method is developed. Natural frequency and corresponding vibration modes of the machine tool were analyzed by using both FEA and vibration test. Stiffness tests and machining experiments show that the rapid machining of most processes for the repaired work pieces can be successfully realized. 展开更多
关键词 reconfigurable design method reconfigurable machine tool modal analysis dynamiccharacteristics
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Improved design of reconfigurable frequency response masking filters based on second-order cone programming
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作者 吴尘 徐新洲 +1 位作者 黄程韦 赵力 《Journal of Southeast University(English Edition)》 EI CAS 2014年第4期422-427,共6页
In order to improve the design results for the reconfigurable frequency response masking FRM filters an improved design method based on second-order cone programming SOCP is proposed.Unlike traditional methods that se... In order to improve the design results for the reconfigurable frequency response masking FRM filters an improved design method based on second-order cone programming SOCP is proposed.Unlike traditional methods that separately design the proposed method takes all the desired designing modes into consideration when designing all the subfilters. First an initial solution is obtained by separately designing the subfilters and then the initial solution is updated by iteratively solving a SOCP problem. The proposed method is evaluated on a design example and simulation results demonstrate that jointly designing all the subfilters can obtain significantly lower minimax approximation errors compared to the conventional design method. 展开更多
关键词 frequency response masking FRM filter optimal design reconfigurability second-order cone programming SOCP
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