Design Of Parameter Detect System Of Magnetorheological Fluid Damper Based On Self-powered Technology

Magnetorheological fluid (MRF) damper is a kind of controllable device for the rheological properties of magnetorheological fluid, which can be changed under an external magnetic field as an important smart material. And it has been widely applied in the domain of vibration control, such as automotive, civil engineering, and national defense industry. In recent years, more and more attention has been paid to the development of MRF devices for its prominent merits: high dynamic range, fast response, relatively small power consumption, mechanical simplicity and environmental robustness. However, many defects still exit in its application for the MRF in the damper may become hardening, bodying and stable under extreme working condition, which will result in unimaginable disaster. Thus, it is very necessary to implement on-line detection and control compensation for the MRF damper.To solve these problems, design and implementation methods to monitor state parameters of MR damper system is proposed in this paper, which is based on self-powered technology and wireless sensor. This MR damper system uses radio frequency transceiver chip nRF9E5 as the core part, and analog electronics, sensors and wireless transceiver technologies are also applied to realize the temperature data collection and short-range wireless data transmission.Firstly, this article introduces the significance of this research and the core technology including energy collecting and management, computer technology and wireless data transmission technology which are all used in self-powered damper's parameters detecting system. And then, the paper analyzes the energy acquisition and management system principles and presents a collection of electromagnetic energy of new mechanical structure. With this new structure, mechanical energy produced by the MR damper's piston cylinder could be transferred into electrical energy. In order to meet the energy demands of the temperature sensors and wireless sensor modules, we must make full use of the poor electrical energy generated by the energy collection system. On this point, we designed an energy management circuit with the super capacitor as the energy storage device.Secondly, details in the design of wireless sensor system are specific introduced. According to modular design concept and characteristics of different modules, the chip selection and schematic design of hardware platform are completed. RS-232 serial bus was used for data exchange with the computer with hardware platform. The software system is implemented by C language to ensure readability and maintainability of the wireless sensor system and implemented the acquisition of temperature data and transmitted them in short distance wirelessly.Finally, the self-powered system was tested based on the energy harvesting and management. The result demonstrates that:The energy harvesting device was able to deliver power (dozens of mW) at the peak open-circuit voltage up to 4.64V. It achieved a reasonable storage and released energy constrained in the management circuit, and the harvested power can guarantee the normal operation of wireless sensor. Meanwhile, the wireless sensor system can capture the environmental temperature and send it to the host computer accurately.