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结构—控制耦合系统是一种机械负载与驱动控制器相互作用的动态反馈系统。将机械系统和控制系统统一考虑，将驱动机械负载的驱动力也看成是结构—控制耦合系统的内力，则可采用处理力学上保守系统的方法使建模和分析大大简化。采用能量方法对无重力状态下弹性梁运动的相对平衡状态进行分析，得出了系统相对平衡的稳定条件。以此稳定条件作为系统运动的控制参数，有利于使弹性梁的动能转化为驱动—控制系统的电磁势能，这样一方面会加速驱动系统的制动，另一方面会迅速衰减弹性梁的振动。研究工作的结果是为弹性梁提供了一种非常简单有效的实时控制方法，该方法已在多种弹性梁试验系统上得到证实。
The structure-control coupling system is a dynamic feedback system that interacts with a mechanical load and a drive controller. Taking the mechanical system and the control system into consideration, the driving force driving the mechanical load can also be regarded as the internal force of the structure-control coupling system, and the modeling and analysis can be greatly simplified by the method of handling the mechanics of the conservative system. The energy balance method is used to analyze the relative equilibrium state of the elastic beam under the non-gravity condition, and the stable condition of the relative equilibrium of the system is obtained. Using this stable condition as the control parameter of the system motion is helpful to transform the kinetic energy of the elastic beam into the electromagnetic potential energy of the drive-control system, which will accelerate the braking of the drive system on the one hand and quickly dampen the vibration of the elastic beam on the other hand. The result of the research work is to provide a very simple and effective real-time control method for elastic beams, which has been proved on a variety of elastic beam test systems.