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Date of Publication:2022-10-06

Journal:大连理工大学学报

Volume:58

Issue:1

Page Number:9-16

ISSN No.:1000-8608

Abstract:In order to soften and loosen the soil that the manila clam (Ruditapes philippinarum) lived,to make clam easier to be mechanically dredged and reduce the tractive resistance of the equipment,a front oscillation device of scarification for Ruditapes philippinarum dredger based on crank and rocker mechanism is designed,simulated and experimentally studied.The ADAMS software is used to build a model and compute the length of crank for different tine's amplitudes.The oscillation pathways of tine tip for different frequencies,traction velocities and amplitudes are simulated.It is beneficial to reduce draft force when the velocity ratio is more than 1 and the minimum velocity angle is less than 90°.The result of the single factor experiment with prototype shows that the higher frequency,larger amplitude and slower traction velocity lead to less penetration force of soil and draft force of device,however,the increase of frequency has limited effect on reduction of draft force in this experiment.Results of orthogonal experiment of three factors and three levels indicate that the effect of traction velocity on soil softening and draft force reduction is significant,and the effect of amplitude on soil softening is very significant.Comprehensively considering the results of all experiments,the optimal performance conditions for softening soil and reducing draft force are amplitude of 1 5 mm,traction velocity of 0.5 1 m/s and crank rotational frequency of 1 5 Hz,the velocity ratio and minimum velocity angle are 1.42 and 73°,respectively,the penetration force of soil is reduced by 64.04% after oscillation scarification.

Note:新增回溯数据