In different kinds of solution , besides approximate methods of calculus of differences , energy approach, finite-element method, lumped mass method, all sorts of theory solution have definite limitation.
在现有的各种解法中除差分法、能量法、有限元法、集中质量法等近似方法外，各种理论解法都存在一定的局限性。
参考来源 - 基于振形正交性的弹性板动力分析法Inertia forces of lumped mass in the system and the velocity of the chain is carried out with different motion curves.
并计算了不同运动规律下链的速度变化曲线及系统中含集中质量的惯性力变化曲线。
参考来源 - 步进传动链机械系统的动力学分析与应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The lumped mass matrix is a diagonal matrix.
集中质量阵是一个对用阵。
It has further simplified into a lumped mass connected by a upper spring and a lower spring from now on.
而文章进一步重新将其简化成由上下两个弹簧连接一个集中质量。
Contrast and analyze single lumped mass and two lumped mass, conclude main factors which affect valve system.
对比分析了单质量模型和二质量模型，归纳了影响配气系统的主要因素。
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