In the first part of this paper, the principle and the error analysis of our ultrasonic velocimeter are presented, and a comparison with the "Sing Around velocimeter" is given.
本文第一章介绍我们的超声波声速仪的原理和误差分析，并给出它和回呜法的比较。
The precise formula of node force fitted second order distributed load is developed sing virtual work principle.
使用虚功原理和位移线性插值推导了满足二次分布力作用的精确节点力分配公式。
The precise formula of node force fitted second order distributed load is developed sing virtual work principle.
使用虚功原理和位移线性插值推导了满足二次分布力作用的精确节点力分配公式。
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