| Abstract: | This paper proposed an online monitoring and early-warning system of dynamic stress of crane metal structure, and designed this system's hardware, including sensor unit, data gathering unit, and controlling & processing unit of this system, and discussed the waterproof protection for resistance strain wafer and scheme of data gathering and transmission of dynamic strain gauge, moreover developed system software of real-time and online monitoring dynamic stress, including data gathering by DLL and data display & processing based on Visual C++. The system applies the dynamic strain gauge to gather the data of the stress, and communicates between PLC control system of crane and upper industrial computer, so that realize the real-time online monitoring and early-warning for crane's metal structure stress. The test results show this system carry on real time and online monitoring to dynamic stress of load-bearing metal structure longly and stability, and can give an alarm and overload protection on time. So the system has good practice value. |
