Journal of Terramechanics最新文献_第8页

Research on drag reduction performance of sliding plate of rice direct seeding machine based on non-smooth structure of loach surface 基于泥鳅表面非光滑结构的水稻直播机滑板减阻性能研究

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-09-02 DOI: 10.1016/j.jterra.2023.08.008

Hongchang Wang , Kaiquan Ding , Guozhong Zhang , Zhen Jiang , Abouelnadar El. Salem , Yuan Gao

{"title":"Research on drag reduction performance of sliding plate of rice direct seeding machine based on non-smooth structure of loach surface","authors":"Hongchang Wang , Kaiquan Ding , Guozhong Zhang , Zhen Jiang , Abouelnadar El. Salem , Yuan Gao","doi":"10.1016/j.jterra.2023.08.008","DOIUrl":"10.1016/j.jterra.2023.08.008","url":null,"abstract":"<div><p>Sliding plate has the problems of large sliding resistance and serious soil adhesion. Loach moves freely and flexibly in mud, has highly efficient lubrication and drag reduction effects. The sliding plate of rice direct seeding machine was selected as the research object and loach as the bionic prototype. The macroscopic and microscopic structure characteristics of loach were observed, the body surface of loach was covered by scales, which had a ridged non-smooth structure. The simulation analysis of the drag reduction performance of the non-smooth structure was carried out, the maximum drag reduction rate was 2.55% at the speed of 1 m/s. A bionic sliding plate of rice direct-seeding machine was constructed based on the non-smooth structure of loach body surface, and its working performance was simulated and analyzed. The results of orthogonal test show that the order of primary and secondary factors of bionic structure parameters affecting drag reduction rate was ribbed spacing > ribbed width > ribbed height. The optimal parameter combination was ribbing height 4 mm, ribbing width 4.5 mm, ribbing spacing, and the optimal drag reduction rate was 4.21%. The results of this study can provide theoretical support for bionic design of soil-engaging components in wet and soft paddy field.</p></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"110 ","pages":"Pages 79-85"},"PeriodicalIF":2.4,"publicationDate":"2023-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46054258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Push-pull locomotion: Increasing travel velocity in loose regolith via induced wheel slip 推拉运动：通过诱导车轮打滑增加松散风化层中的行驶速度

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-09-02 DOI: 10.1016/j.jterra.2023.08.005

Cyndia Cao , Deaho Moon , Colin Creager , Dennis K. Lieu , Hannah S. Stuart

{"title":"Push-pull locomotion: Increasing travel velocity in loose regolith via induced wheel slip","authors":"Cyndia Cao , Deaho Moon , Colin Creager , Dennis K. Lieu , Hannah S. Stuart","doi":"10.1016/j.jterra.2023.08.005","DOIUrl":"10.1016/j.jterra.2023.08.005","url":null,"abstract":"<div><p>Push–pull locomotion is an effective mobility mode for traversing loose lunar regolith and climbing sandy slopes. A rover with an active suspension can generate thrust from a set of anchored wheels by adjusting its wheelbase while driving the remaining wheels. This paper explores the relationship between the velocities of the rotational and translational suspension elements. Using a kinematic slip greater than 30%–40%, inchworming surpasses both the travel velocity and power efficiency of normal driving on slopes between 10°–20°. On a 20°slope, inchworming improves travel reduction from 98% to 85% and reduces normalized power consumption by a factor of eight. Experiments with NASA’s upcoming Volatiles Investigating Polar Exploration Rover show that increasing kinematic slip increases its travel velocity in a sink tank by 35%. Models using granular resistive force theory indicate that wheels driving at higher slip can generate greater tractive force and thus reduce the load on the anchored wheels. Otherwise, at lower driving slip, the load capacity of anchored wheels may be exceeded and result in oscillatory overall travel. These experiments suggest that there is further room to improve wheeled locomotion by intentionally inducing wheel slip, especially in articulated suspensions.</p></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"110 ","pages":"Pages 87-99"},"PeriodicalIF":2.4,"publicationDate":"2023-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41475001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Literature review on Archimedean screw propulsion for off-road vehicles 非公路车辆阿基米德螺旋推进的文献综述

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-08-01 DOI: 10.1016/j.jterra.2023.05.001

Jorge Villacrés, Martin Barczyk, Michael Lipsett

引用次数: 2

Terrain classification using mars raw images based on deep learning algorithms with application to wheeled planetary rovers 基于深度学习算法的火星原始图像地形分类及其在轮式行星探测器上的应用

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-08-01 DOI: 10.1016/j.jterra.2023.04.002

Junlong Guo, Xingyang Zhang, Yunpeng Dong, Zhao Xue, Bo Huang

{"title":"Terrain classification using mars raw images based on deep learning algorithms with application to wheeled planetary rovers","authors":"Junlong Guo, Xingyang Zhang, Yunpeng Dong, Zhao Xue, Bo Huang","doi":"10.1016/j.jterra.2023.04.002","DOIUrl":"https://doi.org/10.1016/j.jterra.2023.04.002","url":null,"abstract":"<div><p>Scene information plays a crucial role in motion control, attitude perception, and path planning for wheeled planetary rovers (WPRs). Terrain recognition is the fundamental component of scene recognition. Due to the rich information, visual sensors are usually used in terrain classification. However, teleoperation delay prevents WPRs from using visual information efficiently. End-to-end learning method of deep learning (DL) that does not need complex image preprocessing was proposed to deal with this issue. This paper first built a terrain dataset (consists of loose sand, bedrock, small rock, large rock, and outcrop) using real Mars images to directly support You Only Look Once (YOLOv5) to test its performance on terrain classification. Because the capability of end-to-end training scheme is positively correlated with dataset, the performance of YOLOv5 can be significantly improved by exploiting orders of magnitude more data. The best combination of hyperparameters and models was achieved by slightly tuning YOLOv5, and data augmentation was also applied to optimize its accuracy. Furthermore, its performance was compared with two other end-to-end network architectures. Deep learning algorithms can be used in the future planetary exploration missions, such as WPRs autonomy improvement, traversability analysis, and avoiding getting trapped.</p></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"108 ","pages":"Pages 33-38"},"PeriodicalIF":2.4,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49865924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-dimensional DEM tillage simulation: Validation of a suitable contact model for a sweep tool operating in cohesion and adhesion soil 三维DEM耕作模拟:在黏性和附着力土壤中操作的扫描工具的合适接触模型的验证

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-08-01 DOI: 10.1016/j.jterra.2023.05.003

Chunling Zhang , Jin Xu , Zihao Zheng , Weiwei Wang , Lichao Liu , Liqing Chen

{"title":"Three-dimensional DEM tillage simulation: Validation of a suitable contact model for a sweep tool operating in cohesion and adhesion soil","authors":"Chunling Zhang , Jin Xu , Zihao Zheng , Weiwei Wang , Lichao Liu , Liqing Chen","doi":"10.1016/j.jterra.2023.05.003","DOIUrl":"10.1016/j.jterra.2023.05.003","url":null,"abstract":"<div><p>Discrete element modelling (DEM) is widely used to estimate soil-tool interaction and tillage forces. To run an accurate simulation, it is essential to determine the appropriate DEM contact model and parameters. Although previous work has been introduced to determine the DEM contact model and parameters, the accuracy of numerical simulation is not high because of the soil differences when tillage tools operate in cohesion and adhesion soil in the middle and lower reaches of the Yangtze River in China. In this paper a Hertz-Mindlin with JKR Cohesion contact model and Linear Cohesion contact model were used to predict soil disturbance area and draft forces. The DEM parameters were determined using cone penetration, and uniaxial unconfined compression as an assisted test. The field experiment using sweep tool was used to validate the simulation results. A good agreement has been showed between simulation results and experiment results. Using verified model, the relative error for the predicted soil disturbance area at speeds of 0.50, 0.75 and 1.00 m/s were 5.3, 3.6 and 7.1 %, respectively. The maximum and average relative errors between simulated and measured draft forces were 6.98 and 3.91%, respectively. The effect of tillage depth and speed at soil disturbance area and draft forces were found which can provide some guidance for the selection of parameters during actual operation.</p></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"108 ","pages":"Pages 59-67"},"PeriodicalIF":2.4,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47984064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correlations between moisture content and color spectrum of sandy soils 砂质土壤水分含量与光谱的相关性研究

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-08-01 DOI: 10.1016/j.jterra.2023.05.002

György Pillinger , Ahmed Elawad Eltayeb Ahmed , Kornél Bessenyei , Péter Kiss

引用次数: 0

Load bearing capacity of finite half space agricultural homogeneous soil 有限半空间农业均匀土的承载能力

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-06-01 DOI: 10.1016/j.jterra.2023.03.001

Nihal D. Salman , György Pillinger , György Sitkei , Péter Kiss

引用次数: 0

Review on soil shear strength with loam sand soil results using direct shear test 土壤抗剪强度与壤土-砂土直接剪切试验结果的比较

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-06-01 DOI: 10.1016/j.jterra.2023.03.003

Alaa El Hariri , Ahmed Elawad Eltayeb Ahmed , Péter Kiss

{"title":"Review on soil shear strength with loam sand soil results using direct shear test","authors":"Alaa El Hariri , Ahmed Elawad Eltayeb Ahmed , Péter Kiss","doi":"10.1016/j.jterra.2023.03.003","DOIUrl":"10.1016/j.jterra.2023.03.003","url":null,"abstract":"<div><p>This article aims to give a background about the soil shear strength and its measurement methods based on scientific articles and the work of researchers. A brief introduction is given about terramechanics science and the loads acting at the interaction zone between the tractive element (wheel/track) and the terrain. The most important loads exciting the terrain from the machine’s tractive element are the normal and the tangential loads. The tangential load will shear the terrain/soil and might lead to slippage, thus it is important to study the shear strength of the soil. In the review the soil terrain behaviour as an elastic and a plastic region is discussed. The conventional methods for measuring the soil strength used by scientists in terramechanics studies are reviewed. The influence of moisture content on soil strength is also taken into consideration. New ideas created by terramechanics scientists that emulate a real wheel/track - terrain interaction case for measuring the soil shear strength and are not civil or geotechnical engineering methods are mentioned. Finally, the shear strength results of loam sand soil obtained using the direct shear test conducted at the Hungarian University of Agriculture and Life Sciences (MATE) are presented.</p></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"107 ","pages":"Pages 47-59"},"PeriodicalIF":2.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43119327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A bionic mechanical foot with adaptive variable postures travelling on sand 一种具有自适应可变姿态的仿生机械脚在沙滩上行走

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-06-01 DOI: 10.1016/j.jterra.2023.03.004

Rui Zhang , Xumin Sun , Dianlei Han , Rui Zhang , Hua Zhang , Jia Ma , Lige Wen , Meng Zou

{"title":"A bionic mechanical foot with adaptive variable postures travelling on sand","authors":"Rui Zhang , Xumin Sun , Dianlei Han , Rui Zhang , Hua Zhang , Jia Ma , Lige Wen , Meng Zou","doi":"10.1016/j.jterra.2023.03.004","DOIUrl":"10.1016/j.jterra.2023.03.004","url":null,"abstract":"<div><p><span>In this study, an adaptive variable posture bionic mechanical foot is designed, which enables the transformation of different postures during the touchdown period. At the same time, the bolts at the joints are tightened to enable the non-variable configuration function of the bionic mechanical foot. A </span>test rig was used to test the travelling and traction performance of the bionic mechanical foot at different speeds on sandy and hard surfaces. The results show that on sandy surfaces, at both high and low speeds, the variable posture mechanical foot outperforms the non-variable posture mechanical foot, especially at high speeds, indicating that the variable mechanical foot is suitable for movement at higher speeds on sandy ground. On hard ground, the traction and pedaling forces generated by the variable posture mechanical foot are essentially the same as those generated by the non-variable posture mechanical foot at low and high speeds, indicating that the travelling and traction performance of both mechanical feet on hard ground is the same. The variable posture mechanical foot is suitable for high-speed movement on sandy ground, providing a theoretical and technical basis for the design of future legged robots for efficient movement on desert surfaces and deep space soft surface environments.</p></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"107 ","pages":"Pages 61-74"},"PeriodicalIF":2.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44958630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Discrete element modelling of soil pressure under varying number of tire passes 不同轮胎道次下土壤压力的离散元建模

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2023-06-01 DOI: 10.1016/j.jterra.2023.02.003

Kobby Acquah, Ying Chen

{"title":"Discrete element modelling of soil pressure under varying number of tire passes","authors":"Kobby Acquah, Ying Chen","doi":"10.1016/j.jterra.2023.02.003","DOIUrl":"10.1016/j.jterra.2023.02.003","url":null,"abstract":"<div><p>Pressure imposed on an arable farmland by farm machinery can lead to severe soil compaction. A model was developed with Discrete Element Method (DEM) to simulate soil – tire interaction. Virtual dead weight method was performed for the purpose of model calibration. Simulated soil pressure data were obtained from the topsoil layer under varying number of tractor tire passes (1P, 2P, 3P, 4P, 5P, 6P, 7P and 8P). Simulation results were validated with maximum soil pressure data from a field experiment in which soil pressure was measured at 0.1 m depth in sandy loam soil. Model results of maximum soil pressure increased from 137.7 to 242.5 kPa when the number of passes increased from 1P to 8P. Prediction of the maximum soil pressure was reasonably accurate for 1P and 2P with Relative Mean Errors (R.M.E) less than 9%. Predictions for 3P to 8P had higher R.M.E. In terms of model application, soil sinkage and rolling resistance ranged from 0.07 to 0.14 m and 225.3 to 517.8 N respectively between one to eight passes. The model developed in this study can be used in the simulation of soil pressure distribution and deformation in the topsoil layer induced by heavy farm machinery.</p></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"107 ","pages":"Pages 23-33"},"PeriodicalIF":2.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44203537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0