Abstract
In the combined transportation of multiple girder transport vehicles, the lifting of multiple hydraulic cylinders must ensure a certain synchronization accuracy, otherwise the bridge structure will be damaged, and even serious construction accidents will occur. The synchronous lifting of a large prefabricated bridge is studied. According to the requirements of synchronous lifting of the bridge, the appropriate control strategy is selected and the hydraulic system of synchronous lifting device is designed. The mathematical model of the synchronous lifting hydraulic system is established, and the fuzzy PID controller is applied. The simulation of the fuzzy adaptive PID control system for the synchronous lifting device is carried out by using MATLAB simulation software, and the simulation results indicate that the rationality of the control system is verified. The experimental results show that the control of the system is convenient and the synchronization accuracy is high, which can provide a reference for the synchronous lifting control.
Highlights
When the bridge is affected by load and natural environment for a long time, there will be different degrees of structural damage, which needs to be replaced when it is serious
If there is asynchrony in the lifting process, it will cause mechanical structure, overturning, and even major accident. erefore, it is of great significance to study how to achieve high-precision synchronous control of multiple hydraulic cylinders [7,8,9]
The lifting system of multiple vehicles constitutes a complex group of hydraulic systems, and the synchronous lifting control of multiple points becomes important
Summary
When the bridge is affected by load and natural environment for a long time, there will be different degrees of structural damage, which needs to be replaced when it is serious. Erefore, the new technology of rapid bridge replacement is urgently needed to reduce the impact on the traffic [1]. After entering the 21st century, SPMT (self-propelled modular transporter) is gradually being used in bridge replacement and new construction projects. Erefore, it is of great significance to study how to achieve high-precision synchronous control of multiple hydraulic cylinders [7,8,9]. E results show that the “master-slave” control strategy based on fuzzy PID is suitable for the technological requirements of bridge lifting.
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