Design Of Wireless Sensor Networks Node For Mechanical Vibration Monitoring

Wireless sensor network is composed of a large number of nodes deployed inmonitoring area. Through wireless communication these nodes form a self-organizingmonitoring network system that can monitor collaboratively in real-time, sense andcollect a variety of environmental or monitoring objects and process the informationthrough the embedded system. Finally, the information is transferred to the user sidethrough self-organizing wireless communication network, which play a supportive rolein the internet of things technology. Wireless sensor networks have been widelyapplied to the military, environmental monitoring, medical, intelligent transportation,smart home and other fields. In the field of mechanical vibration monitoring, there areproblems of high-speed pick-up of the mechanical vibration, high-precisionsynchronous acquisition, storage and transmission of the reliable data, processingcapacity on the chip, energy supply and others. Also a suitable mechanical equipmentcondition monitoring system is lacking, so the application is blocked. Once theseissues are resolved, there will be a very large potential for applications in mechanicalvibration monitoring wireless sensor networks field. The above problems areresearched in this paper, and the main work is as follows.The dual-processor architecture of the node hardware is designed,32-bit ARMprocessor STM32with Cortex M3kernel and low-power wireless RF chip CC2430isadopted as the core.16-bit resolution ADC acquisition chip and MEMS accelerationtransducer are collocated, and then high speed and high resolution of the machineryvibration signal acquisition achieve; integrated high-capacity Micro SD is used as thedata storage device. The plan of storage first and then transmission initially solves theproblem of the high-speed data storage; Large-capacity lithium battery is selected forthe node, then hybrid power supply system is designed to meet the requirements of thenode on the power quality. Moreover, dynamic power management of the electricitymodules can effectively reduce the operating power consumption of the node.On this hardware platform, the embedded real-time operating system istransplanted to the software design of nodes, which effectively dispatches and managesnode tasks, reduces the coupling between modules and improves the portability anddevelopment speed of the program; The file system is also transplanted to the node andthe data is stored on the SD card with the format of file, retrieval and management of the data acquisition become more convenient. In addition, characteristic parameterextraction software of machinery and equipment running is designed to effectivelyreduce the data transmission traffic.Based on the hardware platform of wireless sensor networks mechanicalequipment condition monitoring system, ad-hoc network of multiple nodes and datatransmission are achieved combined with other members of the research groupdesigning mechanical vibration wireless sensor network protocol and the hostcomputer monitoring software. Then a complete wireless sensor networks mechanicalequipment condition monitoring system is formed. Furthermore, experiments andtesting works of the monitoring system have been given.At the end of this paper, the summary and outlook of the research has been given.With the further study of this work, the wireless sensor networks mechanical vibrationmonitoring system will become more and more complete and reliable, which wouldbe used in the field of machinery and equipment condition monitoring.