The stability of box-joint reconfigurable jigs has an important impact on the assembly quality of aircraft components. To overcome the deficiencies in the implementation cost and effectiveness of the current stability evaluation methods, we propose a method for evaluating the stability of box-joint jigs based on the module service state. Firstly, we analyzed the service process of the box-joint jig, pointing out that the process is alternately composed of an operational period and an idle period. The definitions of service stability and the degree of service stability are provided. Then, a service state evaluation model based on the key measurement characteristics of the jig is constructed, based on which the service state degradation process of the box-joint jig can be described and the service state during the idle period can be evaluated using the measured data. Meanwhile, the problem that the measured data is unable to obtain during the operational period can be solved by analyzing the multi-source stability influencing factors and using the stability entropy to represent the degradation degree of the service state. Furthermore, the evaluation results of both the operational period and the idle period are adopted to construct a comprehensive stability evaluation model, which can be applied to evaluating more simply and effectively the service stability of the box-joint jig within a certain period of time than the traditional methods. Finally, a rear spar locator module of a certain vertical tail box-joint jig is used to demonstrate the validity of the proposed methods.
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