关键词: 捆绑连杆, 超静定捆绑, 模拟开关电路, 非线性

Abstract: A load testing system of connecting rod device is introduced. The type of three fulcrum indeterminate bundled is used in connecting the core stage with booster of the large rocket. In order to fully research the load variation of this new type of connecting rod structure in large-scale ground test and pre launch loading process, the load monitoring system of binding link is developed and designed. Multi-channel data acquisition system is used by multi-channel analog switch and scanning technology. At the same time, the data acquisition and data processing software are programmed to analyze and process the collected voltage signals. The load is acquired through the calibrated system. Not only the principle of the hardware and the software but also the two working state are introduced in the paper .Through calibrating connecting rod on the rocket, the relationship between the force of the connecting rod and the output of the system is acquired. Through the standard load test, the linear error is controlled into the allowable range of the system. The load measurement system is accurate, which can be used to measure the load of the connecting rod in the large scale test of the rocket.

Key words: Bundled connecting rod, Statically indeterminate bundle, Analog switching cricuit, Nonlinear