Research On Pre-stressed Stretching System Based On Wireless Communication

Currently prestressed concrete technology has been applied in various fields of civil engineering profession, and tendons are tensioned prestressed construction is key. Prestressed tension is a complex non-linear force transmission, distribution process, stage design of prestressed tension device powered by a PLC or PC as tension control system host controller, the host controller via a wired or wireless communication on both ends of the tensioning device control. However, these devices can only guarantee the tendons tensile stress, Tensile control precision and double-ended long amount of tension during the initial stage of synchronization, as tension was, at both ends of post-tensioning device synchronization will be difficult to maintain.In this regard, this study nRF401 wireless communication module based on the prestressed tension control system. The control system uses primary and secondary control mode, the first time to complete the work is designed to control the machine control system, including hardware and software programs that control the machine control system design of each module. Secondly, the design of prestressed tensioning system for wireless synchronization and wireless communication module for the conduct of key research, including both ends of the sub-control machine synchronous implementations tension, tension synchronous voltage compensation algorithm that both ends of the tension in the whole process tensioning device communicate with each other, conduct tensioning synchronization judgment, if the synchronization is used to synchronize the voltage compensation algorithm for unsynchronized displacement of small displacement of the end of the corresponding control voltage compensation, synchronization tension control; wireless communication module The design includes: hardware circuit, PCB antenna, software research and design of wireless communication module. Then the master control system for a simple design, that master of hardware selection design and user interface design. Finally, under the existing experimental conditions, build the prestressing simulation of hydraulic system of tension equipment, on the prestressed tension control system experiment is mainly divided into stretching equipment for primary and secondary control of pressure and displacement of the prestressed reinforcement tensioning precision and two synchronization control precision verification. And experiment collected tensioned pressure and displacement data graphed, intuitive reaction this set of prestressed tension control system of tension accuracy.This set of prestressed tension system uses wireless communication module to ensure the tensile stress, under the control of the amount of precision Tensile and tension infancy synchronization premise, but also able to handle the tension arising in the course of sync phenomenon. Tension is not synchronized synchronization algorithm that can determine the core used to control the voltage increment proportional relief valve according to the magnitude of displacement is not synchronized, so that the pressure compensation system to achieve the ends synchronization. This paper studies the subsequent prestressed tension control system and wireless synchronization control will play a reference and guidance.