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Investigation into debris cloud characterizations for oblique hypervelocity impact of projectiles on bumper
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作者 张伟 管公顺 +2 位作者 庞宝君 李强 张永强 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第4期372-376,共5页
All long-duration spacecraft in low-earth-orbit are subject to high velocity impacts by meteoroids and space debris. Such impacts are expected to occur at non-normal incidence angles and can cause severe damage to the... All long-duration spacecraft in low-earth-orbit are subject to high velocity impacts by meteoroids and space debris. Such impacts are expected to occur at non-normal incidence angles and can cause severe damage to the spacecraft and its external flight-critical systems and possibly lead to catastrophic failure of the spacecraft. In order to ensure crew safety and proper function of internal and external spacecraft systems, the characteristics of a debris cloud generated by such impacts must be known. An analytical model is therefore developed for the characterization of the penetration and ricochet debris clouds created by the hypervelocity impact of an aluminum spherical projectile on an aluminum plate. This model employs normal and oblique shock wave theory to characterize the penetration and ricochet processes. The prediction results of center-of-mass trajectory and leading velocity of penetration and ricochet debris clouds are obtained and compared with numerical and experimental results in figures. 展开更多
关键词 METEOROIDS space debris hypervelocity velocity impact debris clouds
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车用尾气催化剂催化特性的模拟 被引量:2
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作者 龚惠娟 陈泽智 《计算机与应用化学》 CAS CSCD 2000年第5期446-448,共3页
为研究车用尾气催化剂在实际使用中的工作性能 ,本文建立了用于模拟车用尾气催化剂的转化率 -温度特性模型 ,以及空速对转化率影响的计算模型。利用上述模型 ,可根据不同车辆行驶工况下催化剂的入口温度以及空速情况 ,计算出相应工况下... 为研究车用尾气催化剂在实际使用中的工作性能 ,本文建立了用于模拟车用尾气催化剂的转化率 -温度特性模型 ,以及空速对转化率影响的计算模型。利用上述模型 ,可根据不同车辆行驶工况下催化剂的入口温度以及空速情况 ,计算出相应工况下的催化转化率 ,这样还可为催化剂的设计提供指导。此外 ,本文还讨论了所建模型的限制之处。 展开更多
关键词 模拟 车用尾气催化剂 催化特性 空速影响
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