脉冲型天平高精度全自动校准系统

High-accuracy fully automatic calibration system for impulse balance

中国科学院力学研究所于2012年建成JF-12复现飞行条件激波风洞并投入使用.为满足该大型风洞气动力试验中风洞脉冲型天平的高精确度校准需求,根据应用于激波风洞的脉冲型天平的载荷量程特点,研制了一套大载荷脉冲型天平高精度全自动校准系统(AiBCS).本文详细阐述了该天平校准系统的研制方案、设计思路与构想,以及所涉及的关键技术.建成后的天平校准系统,可满足最大法向力±15 kN量程范围的脉冲型天平的高精确度“一键式”全自动校准.本文对同一台天平在不同校准设备的静态校测数据结果也进行了对比分析,AiBCS的校准指标优异.校准后的脉冲型天平可应用在短试验时间激波风洞中开展高精度气动力测量试验,由此AiBCS的研制完成可为脉冲型风洞高焓流动条件下气动力测量技术的发展提供坚实设备基础和技术支撑.

Long-test duration shock tunnel JF-12 has been built in 2012 in the Institute of Mechanics,Chinese Academy of Sciences.Its performance tests demonstrated that the facility is capable of reproducing the pure airflow with longer than 100 ms test time.In order to develop and improve the force test capability in JF-12,a high-accuracy fully automatic calibration system(AiBCS)for the large-load wind tunnel balances was designed and built,based on the characteristics of impulse-type balance.The design process and some key techniques of the AiBCS are shown and analyzed in detail in this paper.The strain-gauge balance with the maximum loads of 15 kN can be calibrated automatically with highaccuracy in this balance calibration system.In this paper,the calibration data of an impulse-type balance by two calibration equipments are also compared and analyzed,where the performance of AiBCS is more excellent.Therefore,AiBCS provides an equipment foundation and technical supports for the development of force measurement in the impulse facilities,like a high-enthalpy shock tunnel.