Authors

Abstract

Aiming at the problems of coastal ecological damage and low yield of mudflat aquaculture caused by the invasion of M. alterniflora, in order to improve the operational efficiency of mudflat wet and soft ground, and to promote the ecological balance and the development of coastal agriculture, a walking device with twin spiral propellers for muddy wet and soft ground was designed. Using EDEM simulation software to simulate and analyze, the discrete element model of muddy soil particles is established to analyze the interaction mechanism with the spiral propeller and the operation propulsion effect, and it is concluded that the spiral propeller will not produce congestion phenomenon during the operation; data are collected through several simulation tests, and the optimal parameter design of the spiral propeller structure is derived from the response surface analysis, and the spiral propeller is designed to operate at a speed of 2.416 mph in the simulation with the optimal parameter of structural design. The field test shows that the optimal height of the spiral blades is 50 mm, the total length of the drum is 2,970 mm, the helix angle of lift is 30 °, the pitch is 453 mm, and the propelling speed is 2.36 m/s. The data collected through several simulation tests are used to find the optimal parameter design of the spiral propeller structure, and the simulation speed of the spiral propeller in the optimal structural design parameter is 2.416 m/s.

Abstract in Chinese

针对互花米草入侵导致沿海生态破坏，滩涂养殖业低产等问题，为了提高滩涂湿软地面作业效率，促进生态平衡与沿海农业发展，设计一种泥泞湿软地面双螺旋推进器行走装置。利用 EDEM 仿真软件进行仿真分析，建立泥泞土壤颗粒的离散元模型，分析其与螺旋推进器的互作机理与作业推进效果，并探究得出螺旋推进器在作业时不会产生壅土现象；通过多次仿真试验搜集数据，经响应面分析得出螺旋推进器结构的最佳参数设计，螺旋推进器在最佳结构设计参数的仿真推进速度为2.416m/s。田间试验验证表明，在滚筒直径为400 mm，螺旋叶片最佳高度为 50 mm；滚筒总长为 2 970 mm，螺旋升角为 30 °，螺距为 453mm，作业推进速度为 2.36m/s。