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为改善机车车辆的乘坐舒适性，正在开发用于代替弹簧、减振器等被动支承装置的主动减振装置。由于液压油具有不可压缩性，因而油原促动器作为主动减振装置具有良好性能。本文介绍油压促动器控制装置的最佳设计理论，并采用具有3个自由度的半车辆模型，从实际机车车辆走行状况中有可能进行测定的状态量出发，推测出进行控制所必要的状态量，对实施反馈的实际控制系统（LQG控制）进行试验研究，得出了利用LQG控制可以大幅度提高机车车辆减振效果的结论。
In order to improve riding comfort of rolling stock, active damping devices are being developed for replacing passive supporting devices such as springs and shock absorbers. Due to the incompressibility of the hydraulic oil, the oil-based actuator has good performance as an active damping device. This paper introduces the best design theory of the hydraulic actuator control device, and uses a semi-vehicle model with 3 degrees of freedom, starting from the state variables that are likely to be measured in the running conditions of the actual rolling stock and inferring the necessary State quantity, the actual control system (LQG control) that carries out the feedback is tested and the conclusion is drawn that the LQG control can greatly improve the vibration damping effect of rolling stock.