根据梁的波速和半空间波速的相对关系,将T im oshenko梁-半空间系统分成四种不同情况,在梁与半空间相互作用的等效刚度和T im oshenko梁-半空间的弥散方程的基础上,利用弥散曲线,研究了移动荷载的临界速度。这四种情况分别为:软梁-硬半...根据梁的波速和半空间波速的相对关系,将T im oshenko梁-半空间系统分成四种不同情况,在梁与半空间相互作用的等效刚度和T im oshenko梁-半空间的弥散方程的基础上,利用弥散曲线,研究了移动荷载的临界速度。这四种情况分别为:软梁-硬半空间系统,次软梁-硬半空间系统,次硬梁-软半空间系统,硬梁-软半空间系统。研究表明,T im oshenko梁在移动荷载作用下的临界速度取决于梁的波速和半空间波速的相对关系;半空间的R ay le igh波波速始终是一个临界速度,当荷载速度达到R ay le igh波波速时,系统响应会趋于无穷大;对软梁-硬半空间系统,梁的剪切波速和压缩波速也是临界速度;对次软梁-硬半空间系统,梁的剪切波速是临界速度,并且还存在一个最小临界速度;对(次)硬梁-软半空间系统,梁的波速不再是临界速度,但也存在一个最小临界速度。展开更多
A space design for the molecule of hydrocarbon based on the traditional group division method is developed, and a group vector space method (GVSM) for estimating critical property of hydrocarbon is proposed by using t...A space design for the molecule of hydrocarbon based on the traditional group division method is developed, and a group vector space method (GVSM) for estimating critical property of hydrocarbon is proposed by using the module index of the group vector to characterize the group position in the molecule. Expressions for estimating critical properties T_c,p_c and V_c of hydrocarbons are proposed, with the numerical values of relative group parameters presented. The average percentage deviations of T_c,p_c and V_c estimation are 0.62, 2.3 and 1.6 respectively.展开更多
文摘根据梁的波速和半空间波速的相对关系,将T im oshenko梁-半空间系统分成四种不同情况,在梁与半空间相互作用的等效刚度和T im oshenko梁-半空间的弥散方程的基础上,利用弥散曲线,研究了移动荷载的临界速度。这四种情况分别为:软梁-硬半空间系统,次软梁-硬半空间系统,次硬梁-软半空间系统,硬梁-软半空间系统。研究表明,T im oshenko梁在移动荷载作用下的临界速度取决于梁的波速和半空间波速的相对关系;半空间的R ay le igh波波速始终是一个临界速度,当荷载速度达到R ay le igh波波速时,系统响应会趋于无穷大;对软梁-硬半空间系统,梁的剪切波速和压缩波速也是临界速度;对次软梁-硬半空间系统,梁的剪切波速是临界速度,并且还存在一个最小临界速度;对(次)硬梁-软半空间系统,梁的波速不再是临界速度,但也存在一个最小临界速度。
文摘A space design for the molecule of hydrocarbon based on the traditional group division method is developed, and a group vector space method (GVSM) for estimating critical property of hydrocarbon is proposed by using the module index of the group vector to characterize the group position in the molecule. Expressions for estimating critical properties T_c,p_c and V_c of hydrocarbons are proposed, with the numerical values of relative group parameters presented. The average percentage deviations of T_c,p_c and V_c estimation are 0.62, 2.3 and 1.6 respectively.
