| 
		机械臂臂杆刚度主动控制下的末端振动特性研究$^{\bf 1)}$
		 | 
| 
			RESEARCH ON VIBRATION CHARACTERISTICS OF THE MANIPULATOR END UNDER ACTIVE CONTROL OF ARM STIFFNESS$^{\bf 1)}$
			 | 
| 图5. 预紧力为 0 时机械臂末端 $Y$ 方向加速度及频谱图  | 
| Fig.5. The $Y$-direction acceleration and spectrum of manipulator end without preloading force  | 
|  |