Theoretical Modeling And Simulation Analysis Of Acoustic Parametric Array-based Wind Speed Test System

In the current wind speed and direction testing technology, in most cases the use of an ultrasonic signal as wind measurement system input to conduct the experiment of wind speed and direction parameters. However, due to the higher frequency and the faster attenuation in the air, ultrasonic signal cannot be well suited for long-distance, large-scale measurement of wind speed and direction. Compared with the ultrasonic signal, acoustic parametric array signal can generate an audible sound source having high directivity and low frequency, which is a new sound source system. Based on the characteristics of this advantage, acoustic parametric array technology will play an important role in the test of wind speed and direction, which is better used to measure wind speed and direction of harsh environments and a wide range. Parametric array technology is imperative in the development of sound velocity measurement. This article explores the use of parametric acoustic array technology to test wind speed and direction issues in a wide range and in the space environment, theories analyzing and experiment simulating on the wind measuring and modeling.For producing audible sound with high directivity characteristics, acoustic parametric array is used to establish weed speed testing system. Acoustic parametric array signal module is placed in the front of wind speed and direction data processing module, improving the accuracy of the wind systems. Demonstrating the feasibility of the system by MATLAB simulation and verifying the effectiveness of the system by DSP platform and experiment, in the meanwhile, simulating analysis and improving the performance of the algorithm.In order to establish sound parameter wind speed test system, the work of acoustic parametric array is carried out in detail in this paper. And simulating parametric array sound system is to model the wind measurement system. Then transit-time theory is applied in wind speed test system. Next, using cross-correlation delay estimation algorithm with the combination of transit-time wind measurement principle, sound parametric array wind model is established. Finally, the feasibility of the model is verified.While modeling wind speed measurement of the parametric array sound, ultrasonic wind speed and direction test system model is established using transit-time wind measurement principle and cross-correlation delay estimation algorithm. Focus on comparing performance of two wind measurement systems. By MATLAB simulating the system performance parameters, such as measuring accuracy and range of the model, parametric array sound wind measurement system is proved more accurate.Finally, based on theoretical deriving and experimental simulation modeling, wind speed measurement of the parametric array sound is tested by using DSP platform. The feasibility and effectiveness of the model is verified. And both system implementation and simulation process and cross-correlation delay estimation algorithm implementation process are given. At the same time the associated experimental test platform is built. Experimental results show that, wind speed and direction testing system designed in this paper can effectively utilize low-frequency, high directivity characteristic advantages of audio signals which is produced by acoustic parametric array. In terms of large-scale wind measurement, the model can be higher accuracy than previous wind measurement technology.