To be convenient, we only study the motion of a helicopter in the critical plane, and a simplified point-mass model is used.
然后，为了便于最优控制问题的分析和计算，本文只考虑直升机的二维运动，从而得出一个简化的点质量模型。
参考来源 - 直升机自转着陆过程的最优控制Research the basic theory of computing trajectory disturbing gravity by using point-mass model, and establish the frequency point-mass model of test region.
研究了利用点质量模型计算空间弹道点扰动引力的基本理论与方法,并针对试验区域建立了分频段点质量模型。
参考来源 - 快速逼近弹道扰动引力的算法研究·2,447,543篇论文数据，部分数据来源于NoteExpress
本文论述了以地面离散的测量数据通过建立点质量模型的方法求解物理大地测量边值问题的基本原理。
This paper describes the basic principle of solving the boundary value problem in physical geodesy by establishing the point-mass model with scattered measurements on the earth's surface.
城市空气质量回归预报模型的残差分布存在着不对称现象，它是由高杠杆点引起。
There exists asymmetry characteristic of residual distribution in the regression model of city air quality forecast. It is caused by some high leverage cases.
建立了这类系统的动力学模型，包括考虑附加质量的一般刚体动力学方程和基于“平衡点”假设的吊挂系统建模方法。
The model is comprised of the general rigid-body equations considering apparent mass and the modeling method of suspension system based on the assumption of "equilibrium points".
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