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在随动曲线坐标系下模拟矩形坯压缩变形的能量法 被引量:1
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作者 陶永发 杨煜生 董欣 《东北重型机械学院学报》 CAS 1992年第1期1-8,共8页
本文提出一种新的模拟塑性流动的数值法-__在随动曲线坐标系下的能量法.运动学可能速度场、变形总功率泛函以张量形式表达在随动曲线坐标系上,通过优化可变参数使泛函达最小值,以求得变形过程中速度场、位移增量场和最终位移场.根据上... 本文提出一种新的模拟塑性流动的数值法-__在随动曲线坐标系下的能量法.运动学可能速度场、变形总功率泛函以张量形式表达在随动曲线坐标系上,通过优化可变参数使泛函达最小值,以求得变形过程中速度场、位移增量场和最终位移场.根据上述算法和所编制的FORTRAN程序,本文计算了平板间矩形坯压缩变形的位移场.计算结果得到实验验证. 展开更多
关键词 矩形坯 塑性压缩 能量法 随动曲线
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随动曲线坐标能量法解平面塑性压缩问题
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作者 陶永发 杨煜生 王成全 《东北重型机械学院学报》 1994年第3期189-194,共6页
本文给出平面压缩时随动曲线坐标下运动可能速度场和相应的力学张量表达式.利用电算法优化可变参数使总能量泛函达最小值.从而获得流动速度场、位移场、应变速率和应力场的数值解.描述出在不同高宽比时坯料产生单鼓形和双鼓形等现象... 本文给出平面压缩时随动曲线坐标下运动可能速度场和相应的力学张量表达式.利用电算法优化可变参数使总能量泛函达最小值.从而获得流动速度场、位移场、应变速率和应力场的数值解.描述出在不同高宽比时坯料产生单鼓形和双鼓形等现象.计算结果与实验吻合较好. 展开更多
关键词 随动曲线坐标 能量法 平面压缩
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Development and control of flexible pneumatic wall-climbing robot 被引量:7
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作者 王志恒 鲍官军 +1 位作者 张立彬 杨庆华 《Journal of Central South University》 SCIE EI CAS 2009年第6期961-970,共10页
A new kind of flexible pneumatic wall-climbing robot,named WALKMAN-I,was proposed. WALKMAN-I is basically composed of a flexible pneumatic actuator (FPA),a flexible pneumatic spherical joint and six suction cups. It h... A new kind of flexible pneumatic wall-climbing robot,named WALKMAN-I,was proposed. WALKMAN-I is basically composed of a flexible pneumatic actuator (FPA),a flexible pneumatic spherical joint and six suction cups. It has many characteristics of low-cost,lightweight,simple structure and good flexibility. Its operating principle was introduced. Then three basic locomotion modes,which are linear motion,curvilinear motion and crossing the orthogonal planes,were presented. The safety conditions of WALKMAN-I were discussed and built. Finally,the control system was designed and experiments were carried out. Experimental results show that WALKMAN-I is able to climb on the vertical wall surface along a straight line or a curved path,and has the ability of crossing orthogonal planes and obstacles. The maximum rotation angle reaches 90°,the maximum velocity reaches 5 mm/s,and the rotation angle and the moving velocity of WALKMAN-I can be easily controlled. 展开更多
关键词 wall-climbing robot locomotion mode flexible pneumatic actuator (FPA) flexible pneumatic spherical joint safety analysis
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