| Rice yield accounts for more than 40% of total grain yield in China.The rice industry has a close influence on the development of national economy and is related to the issue of food security in China.Paddy field leveling is a key link in the process of rice planting,and it plays an important role in improving water and fertilizer utilization efficiency and increasing rice yield.This article aims to improve the surface flatness of the paddy field before rice planting,designed a separated paddy field rotary tilling and leveling machine based on GNSS and combined with field trial to study the working performance and actual operation effect of the machine.The specific research content is as follows:(1)Analysis of design plan.Summarize and analyze the research status of domestic and foreign leveling machinery and GNSS leveling technology,combined with the agronomic requirements of rice planting,put forward the overall design plan of the separated paddy field rotary tilling and leveling machine: Using the GNSS leveling technology to design a paddy field rotary tilling and leveling machine with separated rotary tilling machine and scraper.By controlling the horizontal inclination and working height of the scraper,the paddy field leveling operation is realized.(2)Overall structure design.The design scheme of paddy field rotary tilling and leveling machine with rotary tilling machine and scraper is adopted,and the suspension frame,rotary tilling machine hood and the attitude adjustment mechanism of the scraper are designed to realize the posture adjustment of the scraper;According to the design requirements of the hydraulic system of the separated paddy field rotary tilling and leveling machine,the hydraulic unit design is completed by adopting the hydraulic scheme of the motor-hydraulic pump unit and the accumulator working together.(3)Control system design.According to the control strategy and control requirements of the separated paddy field rotary tilling and leveling machine,carry out the leveling control system design,complete the integrated control cabinet design and software program design;The ITGC algorithm is applied to the leveling control system,combined with experiments to verify the regulation performance of the control system,and determine the most suitable control period of the control system.(4)Research on denoising method of tilt signal.Analyze the noise source of the inclination signal of the beating machine during the operation of the separate paddy field beating grader,based on the theoretical analysis of the wavelet threshold denoising method and Kalman filter,study the wavelet threshold-Kalman fusion algorithm;compare and analyze the denoising effect of wavelet threshold denoising method,Kalman filter and fusion algorithm on tilt signal,experiments show that the signal-noise ratio of the signal is increased from 21.704 to 39.116 after the inclination signal is processed by the fusion algorithm.The wavelet threshold-Kalman fusion algorithm is suitable for the denoising of the inclination signal.(5)Field trial.Carry out field trials of separated paddy field rotary tilling and leveling machine.The trial results show that the separated paddy field rotary tilling and leveling machine based on GNSS has good working performance and land leveling effect,the flatness of the paddy field after the operation is within 3cm,so that the farmland will reach the state of rice ready to be transplanted. |
