Journal of Terramechanics最新文献_第2页

Effect of vertical load on track traction under different soil moisture content 不同土壤含水量下垂直荷载对轨道牵引力的影响

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-12-20 DOI: 10.1016/j.jterra.2024.101044

Zhuohuai Guan, Dong Jiang, Min Zhang, Mei Jin, Haitong Li, Tao Jiang

{"title":"Effect of vertical load on track traction under different soil moisture content","authors":"Zhuohuai Guan, Dong Jiang, Min Zhang, Mei Jin, Haitong Li, Tao Jiang","doi":"10.1016/j.jterra.2024.101044","DOIUrl":"10.1016/j.jterra.2024.101044","url":null,"abstract":"<div><div>Comprehensive analysis of the tractive performance is central to the design of tracked agriculture vehicles, particularly in challenging terrain conditions. To assess the effect of altering the track traction, the stress state of the track plate and grousers were analyzed based on the terramechanics. A simulation model based on the discrete element method (DEM) was proposed to explore the displacement of soil particles and stress distribution within the soil. Subsequently, a test bench was developed to investigate the effect of vertical load, soil moisture content, and grouser height on the maximum track traction. The results demonstrated that DEM simulation could reproduce the experimental results sufficiently well with a relative error of 3.5 % for maximum traction. The highest vertical stress is located beneath the grousers and the horizontal stresses are found to be higher near the bottom of the grousers. The vertical load exerts the most significant influence on track traction. Moisture content mainly affects the rate of increase in track traction at different vertical loads. At the moisture contents of 10 % and 15 %, and under vertical loads of 1000 N and 1500 N, the grouser height had little impact on maximum traction. However, at a soil moisture content of 25 % and under vertical loads of 2500 N and 3000 N, increasing the grouser height resulted in a notable enhancement of track traction.</div></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"118 ","pages":"Article 101044"},"PeriodicalIF":2.4,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148054","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

Editorial: Best papers of the ISTVS 2023 conference 编辑：ISTVS 2023会议最佳论文

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-12-13 DOI: 10.1016/j.jterra.2024.101042

Jarosław Pytka, Schalk Els, Massimo Martelli

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Interaction-aware control for robotic vegetation override in off-road environments 越野环境下机器人植被覆盖的交互感知控制

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-11-29 DOI: 10.1016/j.jterra.2024.101034

Charles Noren, Bhaskar Vundurthy, Sebastian Scherer, Matthew Travers

{"title":"Interaction-aware control for robotic vegetation override in off-road environments","authors":"Charles Noren, Bhaskar Vundurthy, Sebastian Scherer, Matthew Travers","doi":"10.1016/j.jterra.2024.101034","DOIUrl":"10.1016/j.jterra.2024.101034","url":null,"abstract":"<div><div>Robotic systems tasked with completing off-road economic, military, or humanitarian missions often encounter environmental objects when traversing unstructured terrains. Certain objects (e.g. safety cones) must be avoided to ensure operational integrity, but others (e.g. small vegetation) can be interacted with (e.g. overridden/pushed) safely. Pure object-avoidance assumptions in conventional robotic system navigation policies may lead to inefficient (slow) or overly-cautious (immobilized) traversal behaviors in off-road terrains. To address this gap in system performance, we draw inspiration from existing hybrid dynamic system control literature. We have designed a nonlinear trajectory optimization controller that utilizes vegetation-interaction models as a jump map in the dynamics constraint. In contrast to purely vision-based navigation policies which classify the traversability of obstacles, the allowable subset of objects with which the vehicle can safely interact is now characterized by a data-driven collision model and the existence of a dynamically-feasible trajectory which satisfies the contact constraints. The controller’s capabilities are demonstrated on a full-sized autonomous utility task vehicle where objects including posts and trees of up to 25.4 [mm] and 81.8 [mm] diameter are overridden.</div></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"117 ","pages":"Article 101034"},"PeriodicalIF":2.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745171","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

Analyzing bearing capacity changes due to vibration in discrete element method simulations 用离散元法模拟分析振动引起的承载力变化

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-11-29 DOI: 10.1016/j.jterra.2024.101031

Tomohiro Watanabe , Ryoma Higashiyama , Dai Watanabe , Kojiro Iizuka

{"title":"Analyzing bearing capacity changes due to vibration in discrete element method simulations","authors":"Tomohiro Watanabe , Ryoma Higashiyama , Dai Watanabe , Kojiro Iizuka","doi":"10.1016/j.jterra.2024.101031","DOIUrl":"10.1016/j.jterra.2024.101031","url":null,"abstract":"<div><div>Recently, legged robots have gained significant attention as highly mobile platforms for planetary exploration. However, the surfaces of celestial bodies such as the Moon are mainly composed of loose materials, leading to slippage due to the deformation of the surface under the movements of the rover’s legs. To address this issue, we proposed a walking method designed to minimize slippage. Our previous research demonstrated that applying vibrations can increase both the shear strength of the ground and the amount of the rover’s leg subsidence, thereby enhancing the ground’s bearing capacity, which is related to the counterforce provided by the ground against the legs of the rover. For the robot to perform optimally, it is essential to accurately estimate this bearing capacity to select efficient vibration settings. In this study, we utilized the discrete element method (DEM) to simulate the ground’s bearing capacity under various vibrational influences changing both the sinkage depth of a leg and the vibration frequency. Our simulations successfully mirrored the real-world effects of vibrations on bearing capacity, providing insightful perspectives on how vibration can be used to enhance ground support for these robotic explorers.</div></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"118 ","pages":"Article 101031"},"PeriodicalIF":2.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744582","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

Optimization of subsoiler design using similitude-based DEM simulation and soil bin testing on cohesive-frictional artificial soil 利用基于模拟的 DEM 仿真和粘性摩擦人工土壤的土仓测试优化底土机设计

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-11-22 DOI: 10.1016/j.jterra.2024.101026

Adewale M. Sedara , Mohamed A.A. Abdeldayem , Francisco Pratas Glycerio de Freitas , Tekeste Z. Mehari

{"title":"Optimization of subsoiler design using similitude-based DEM simulation and soil bin testing on cohesive-frictional artificial soil","authors":"Adewale M. Sedara , Mohamed A.A. Abdeldayem , Francisco Pratas Glycerio de Freitas , Tekeste Z. Mehari","doi":"10.1016/j.jterra.2024.101026","DOIUrl":"10.1016/j.jterra.2024.101026","url":null,"abstract":"<div><div>The study highlights the need for effective and efficient methods in designing tillage shanks to alleviate deep soil compaction, especially in wet soil conditions. Current techniques relying on full-scale tillage tools testing are prone to costly and time-consuming engineering product development cycles. DEM simulation of soil-to-shank interaction was utilized for screening twelve geometrically scaled (1:5.63) shanks to top-ranked six shanks, aiming reduced soil horizontal forces and maximum bulk density difference. Six scaled shanks (a straight, a bent, and four paraplow shapes) were fabricated and tested using a split-plot design soil bin experiment on cohesive-frictional artificial soil to investigate their performances on soil reaction forces and soil loosening parameters. Shank design had significant effects (<em>p</em> < 0.05) on energy responses (soil horizontal and vertical reaction forces), above-ground soil loosening (cross-sectional area, trench width, bulk density difference), and below-ground soil loosening (soil rupture area, D1 and D2) parameters. Using an optimization profiler, S-3 (β = 60°, α = 45°) demonstrated the best overall desirability score (0.58) with objectives reducing soil reaction forces and maximizing soil loosening. Manufacturing the S-3 to a full scale is proposed for evaluating its efficiency in tillage energy and soil loosening on field soil conditions for subsoil compaction management.</div></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"117 ","pages":"Article 101026"},"PeriodicalIF":2.4,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700793","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

A Riemann-based SPH formulation for modelling elastoplastic soil behaviour using a Drucker–Prager model 利用德鲁克-普拉格模型建立弹塑性土壤行为模型的基于黎曼的 SPH 公式

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-11-21 DOI: 10.1016/j.jterra.2024.101033

M. Lallemand , C. De Sousa , C. Hermange , J. Michel , G. Oger

{"title":"A Riemann-based SPH formulation for modelling elastoplastic soil behaviour using a Drucker–Prager model","authors":"M. Lallemand , C. De Sousa , C. Hermange , J. Michel , G. Oger","doi":"10.1016/j.jterra.2024.101033","DOIUrl":"10.1016/j.jterra.2024.101033","url":null,"abstract":"<div><div>The present paper aims at proposing and investigating a Riemann-based SPH formulation to simulate the elastoplastic behaviour of soils undergoing large deformations, using a Drucker–Prager model. Basing on the pioneer work from Parshikov and Medin (Parshikov and Medin, 2002), a Riemann solver is used to maintain regular fields while being free of tuning parameters. By contrast to the work in Parshikov and Medin (2002) where piecewise constant reconstructions were employed, piecewise linear reconstructions are preferred in this work to reduce the numerical diffusion. A Particle Shifting Technique (PST) is used to maintain regular particle distributions and consequently accurate SPH interpolations. To the best of the author’s knowledge, the use of a Riemann solver specific to solid mechanics with a pressure-dependent elastoplastic Drucker–Prager yield surface to model the behaviour of the material represents a novelty with respect to the existing literature. A Boundary Integral Method (BIM) initially derived for fluid dynamics (Ferrand et al., 2013; Chiron et al., 2019) is adapted to solid mechanics in order to handle complex geometries. It allows to deal with wall treatment without using fictitious particles, and shows satisfactory results even in sharp angle regions. The ability of the proposed Riemann-based formulation to simulate accurately elastoplastic problems and its robustness are examined through several test cases in plane strain conditions. Attention is paid to the capacity of the formulation to mitigate the occurrence of Tensile Instability (TI) with respect to other schemes, for which additional treatment is required to treat this issue, such as the additional artificial stress method (Gray et al., 2001).</div></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"117 ","pages":"Article 101033"},"PeriodicalIF":2.4,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700792","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

Editorial: Soil modeling and simulation for terramechanics applications of manned and unmanned autonomous vehicles 编辑：载人和无人自动驾驶车辆的地形力学应用土壤建模与模拟

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-11-21 DOI: 10.1016/j.jterra.2024.101032

Mehari Tekeste Guest editor, Thomas R. Way Guest editor, Mustafa Alsaleh Guest editor

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Acoustic winter terrain classification for offroad autonomous vehicles 用于越野自动驾驶车辆的冬季地形声学分类

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-11-15 DOI: 10.1016/j.jterra.2024.101028

Anthony T. Fragoso

引用次数: 0

Investigation of steer preview methods to improve predictive control methods on off-road vehicles with realistic actuator delays 研究转向预览方法，以改进具有实际执行器延迟的越野车预测控制方法

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-11-14 DOI: 10.1016/j.jterra.2024.101027

Andries J. Peenze, P. Schalk Els

{"title":"Investigation of steer preview methods to improve predictive control methods on off-road vehicles with realistic actuator delays","authors":"Andries J. Peenze, P. Schalk Els","doi":"10.1016/j.jterra.2024.101027","DOIUrl":"10.1016/j.jterra.2024.101027","url":null,"abstract":"<div><div>This paper investigates improvements that can be made to predictive control methods for off-road vehicles by adding of realistic steering preview. The objective of this study is to improve the performance and efficacy of predictive controllers by accounting for significant time delays in active and semi-active systems on vehicles. Traditional zero-order and first-order hold methods for steer preview are compared to a more realistic steer preview method. Semi-active suspension, rear wheel steering, and individual brake actuation are used as the actuators on this off-road vehicle. The results show that the addition of a realistic steering preview improves the handling performance of the vehicle in a severe double lane change manoeuvre on rough roads. Up to 10% reduction in roll angle can be achieved with semi-active suspension control. A 34% reduction in side-slip angle is possible with rear wheel steering control and a 15% reduction in side-slip angle is achieved with differential braking control. The controllers can pre-empt and consider the effect of the actuator time delays, and the preview states from the predictive controller are more representative over the prediction horizon. The findings suggest that the addition of a realistic steering preview can improve the performance of predictive controllers on vehicles. Further investigation of other disturbances and their preview effects on the system should be conducted to find further improvements for predictive control strategies on vehicles.</div></div>","PeriodicalId":50023,"journal":{"name":"Journal of Terramechanics","volume":"117 ","pages":"Article 101027"},"PeriodicalIF":2.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142650957","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

Comparison of selected tire-terrain interaction models from the aspect of accuracy and computational intensity 从精度和计算强度方面比较选定的轮胎-地形相互作用模型

IF 2.4 3区工程技术

Journal of Terramechanics Pub Date : 2024-11-08 DOI: 10.1016/j.jterra.2024.101030

Dávid Körmöczi , Péter Kiss

引用次数: 0