Based on kinematic principle, Whiffletree structure is widely used in axial support system of largeaperture telescopes. In order to reach expected support effect. and ensure the precision of the mirror surface figure,the balance of the Whiffletree structure is rigorously required. To meet this adjustment and test requirement. ac-cording to the structural features of Whiffletree structure. the Load cells. the dial indicator and other instruments are used to test the balance of the Whiffletree structure. and the balance of the Whiffletree structure is adjusted by adding or subtracting the balance weight and adjusting the height of the balance weight. Firstly, the principle of this adjustment and test method is presented. and then the experiment is processed on a Whiffletree structure which is used in the primary mirror' s axial support system of a certain telescope. Test results show. after adjustment. The error of the support force in every support point is within limits of +0. 25 N. and meets the design requirement of +0. 5 N. This method is practicable. and has certain reference significance for Whiffletree structure to be better used for the large aperture telescope support in the future.%基于运动学原理的Whiffletree结构被广泛应用在大口径望远镜底支撑中.为了达到理想的支撑效果,保证主镜镜面面形精度,对Whiffletree结构的平衡性能提出了很高的要求.针对这一装调测试需求,结合Whiffletree结构的特点,提出了运用Load cell、千分表等仪器对Whiffletree结构的平衡性测试方案,并通过增减配重和调节配重高度的方法对Whiffletree结构的平衡性进行调节.首先对该装调测试方案进行了原理分析,然后使用该方案对某望远镜主镜底支撑所采用的Whiffletree结构的平衡性进行了调节和测试.测试结果表明,经调节后的结构各支撑点支撑力误差在±0.25 N范围内,满足±0.5 N的设计要求.该方法切实可行,对今后Whiffletree结构更好地应用在大口径望远镜的支撑中具有一定指导意义.
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