Research On Wind Speed Measurement Technology Based On MEMS Pressure Sensor

In micro meteorological research,wind monitoring is widely used in transmission lines,tower cranes,bridges,wind power construction,and other fields.This article discusses the needs of different fields in detail.Through analyzing the existing wind speed measurement methods from the aspects of functions,costs,and application scenarios,it is found that existing devices generally have high costs and lack of information storage functions.Therefore,it is necessary to study a low cost,low power consumption,wind speed and direction measurement technology with functions such as data storage and short range wireless transmission,to detect micro meteorological wind field information in the environment where the project construction is located Safety and targeted maintenance play an important role.Based on the relationship between wind pressure and wind speed,this paper analyzes the current research status of scholars at home and abroad on wind pressure sampling methods.A new sampling method is proposed,which uses MEMS pressure sensors to measure the wind pressure in specially designed non closed air chambers,and compensates the measured values to obtain the actual wind pressure value.The wind speed is calculated based on the wind pressure wind speed formula.The article provides a detailed design of the system,and the main research content includes:1.Firstly,in the design of the acquisition node system,the design is mainly carried out from the aspects of power consumption,data storage,power selection and monitoring of the entire system.Combined with reliability design,the integrity of data stored by the acquisition node in a long-term unattended outdoor complex environment is ensured.Experimental tests and calculations show that,with the overall design of the system completed,It can ensure that the clock is continuously powered up for 2-3 years and store wind data for about 1 year.2.Secondly,in the design of data wireless transmission,superheterodyne wireless transmission technology is adopted,mainly from the aspects of hardware circuit,software interception,data coding,communication protocol,etc.,to ensure the reliability of acquisition nodes in short distance transmission.Experimental tests show that: not only meets the technical indicators of low cost,but also achieves zero packet loss rate in wireless transmission within30 meters.3.Finally,in the node structure design,mainly from the aspects of wind pressure sampling,wind direction collection,wind compressor chamber,and other aspects,and through fluid simulation analysis of the overall sampling method,the feasibility of the sampling method was verified,the ideal pressure curve was obtained,and the problem of compensation through wind pressure pressure loss calculation was solved.A calibration experiment was conducted on the designed prototype using a wind cup anemometer,and the results showed that the error did not exceed 5%,The larger the wind speed,the smaller the error.When the wind speed reaches11m/s,the error does not exceed 2%.The purpose of this article is to break through the wind pressure sampling method with adaptive wind direction and the key technology of wind speed measurement in an airtight chamber with complex components,and form a collection node that can measure,store,and transmit wind energy under long-term unattended outdoor conditions.This provides a low-cost new measurement technology for large-scale engineering construction and detection of micro meteorological wind energy information and characteristics analysis,making up for the current vacancy in micro meteorological wind energy measurement.