期刊文献+
共找到9篇文章
< 1 >
每页显示 20 50 100
月球车坡路行驶地面力学模型与运动性能分析 被引量:8
1
作者 黄卫东 鲍劲松 +1 位作者 徐有生 赵海亮 《机械工程学报》 EI CAS CSCD 北大核心 2013年第5期17-23,共7页
坡路是崎岖月面环境的典型路况,在分析月球车轮地相互作用模型基础上,建立月球车坡路行驶地面力学模型。同时考虑到前面车轮对月壤扰动变形的影响,在表征不同车轮的沉陷量时,引入沉陷率系数。建立月球车三维可视化仿真平台,并通过对比... 坡路是崎岖月面环境的典型路况,在分析月球车轮地相互作用模型基础上,建立月球车坡路行驶地面力学模型。同时考虑到前面车轮对月壤扰动变形的影响,在表征不同车轮的沉陷量时,引入沉陷率系数。建立月球车三维可视化仿真平台,并通过对比仿真试验结果与实车试验数据,验证仿真的正确性。通过月球车坡路行驶运动过程仿真分析,给出月球车坡路行驶运动控制策略:当坡度角大于26.6°时,应进行避障,而当月球车具有足够的车轮牵引力时,应控制车轮速度,使月球车在最佳滑转率下行驶。 展开更多
关键词 月球车 坡路行驶 地面力学模型 仿真
下载PDF
基于aerosim模型库的飞行器地面动力学模型建模方法
2
作者 徐南波 《科技信息》 2013年第20期427-427,共1页
本文利用aerosim飞行动力学模型库,介绍了在HL20飞机的基础上搭建地面动力学模型的方法,以实现HL20飞机降落后的滑跑,转弯和刹车功能。
关键词 地面力学模型 滑跑 转弯 刹车
下载PDF
基于车辆动力学模型的动态质量测试方法在非公路宽体车上的应用
3
作者 任宏亮 《时代汽车》 2022年第18期27-29,共3页
本文研究了非铺装道路情况下非公路宽体车的动态质量测定问题,针对现有车辆质量测试的不足,提出了基于车辆动力学模型的动态质量测试方法,该方法首先需要建立精确的车辆动力学和地面力学模型,基于现有无人驾驶硬件平台设计了专门的动态... 本文研究了非铺装道路情况下非公路宽体车的动态质量测定问题,针对现有车辆质量测试的不足,提出了基于车辆动力学模型的动态质量测试方法,该方法首先需要建立精确的车辆动力学和地面力学模型,基于现有无人驾驶硬件平台设计了专门的动态质量测试系统,分析了测试过程的偏差数据并在算法中剔除异常数据,车辆质量数据通过均方根值持续累计并实时显示在测试监控界面上,通过测试数据表明:上述方法获取的数据有效且误差较小,具有很大的现实意义,对于无人驾驶车辆经济性控制算法具有决定性作用。 展开更多
关键词 非公路宽体自卸车 车辆动力学模型 车辆地面力学模型 动态质量测试方法
下载PDF
坡道行驶工况下月球车运动控制策略仿真
4
作者 黄卫东 鲍劲松 +1 位作者 徐有生 赵海亮 《中国机械工程》 EI CAS CSCD 北大核心 2012年第20期2481-2487,共7页
坡道是崎岖月面环境的典型路况,在分析月球车轮地相互作用模型并对其进行修正的基础上,建立月球车坡道行驶地面力学模型。同时考虑前面车轮对月壤扰动变形的影响,提出了月球车行驶过程中前后车轮沉陷量的计算方法。最后通过分析月球车... 坡道是崎岖月面环境的典型路况,在分析月球车轮地相互作用模型并对其进行修正的基础上,建立月球车坡道行驶地面力学模型。同时考虑前面车轮对月壤扰动变形的影响,提出了月球车行驶过程中前后车轮沉陷量的计算方法。最后通过分析月球车坡路行驶运动过程,得出如下结论:当坡度角大于21.8°时,应进行避障,而当月球车具有足够的车轮牵引力时,应控制车轮转速,使月球车在最佳滑转率下行驶。在月球车三维可视化仿真平台中进行了仿真验证和试验验证。 展开更多
关键词 月球车 坡道行驶 地面力学模型 运动控制策略
下载PDF
新型飞机着陆动载特性研究 被引量:4
5
作者 崔云化 岑国平 梁磊 《计算机仿真》 北大核心 2020年第4期15-21,共7页
为了研究道面板在高胎压、大质量、短距离起降的作用下的荷载响应规律,根据新型飞机的受力特性和运动规律,分析起落架-机轮-道面耦合作用,并考虑飞机气动力变化,建立起5自由度的飞机地面动力学模型。通过四阶Runge-Kutta法求解微分方程... 为了研究道面板在高胎压、大质量、短距离起降的作用下的荷载响应规律,根据新型飞机的受力特性和运动规律,分析起落架-机轮-道面耦合作用,并考虑飞机气动力变化,建立起5自由度的飞机地面动力学模型。通过四阶Runge-Kutta法求解微分方程组,研究道面荷载随时间和空间的变化问题。研究结果表明,新型飞机主起落架产生的道面动载系数能达到1.4,飞机下沉速度是影响着陆荷载的主要因素,其次为飞机质量与俯仰角,飞机胎压对着陆荷载影响较小,但对道面板影响较大。 展开更多
关键词 着陆荷载 动载系数 缓冲器 飞机地面力学模型 数值仿真
下载PDF
Ground movement mechanism in tectonic stress metal mines with steep structure planes 被引量:4
6
作者 夏开宗 陈从新 +2 位作者 刘秀敏 郑元 付华 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第9期2092-2104,共13页
When mining metal mines with steep structure planes by the caving method,there is a mechanical model in which the horizontal stress on the rock mass is simplified as a column before surface subsidence.The model is use... When mining metal mines with steep structure planes by the caving method,there is a mechanical model in which the horizontal stress on the rock mass is simplified as a column before surface subsidence.The model is used to deduce critical support load and limiting column length for a given horizontal stress and support pressure.Considering the impact of the column effect,a method is proposed to determine the movement of the ground and caving area in a mine.After surface subsidence,the horizontal stress on a surrounding rock mass can be simplified to a cantilever beam mechanical model.Expressions for its bending fracture length are deduced,and a method is given to determine its stability.On this basis,an explanation for the large ground movement and subsidence scope was given.A case study shows that the damage effect of column and cantilever beam is significant for ground movement in metal-ore mine,and an appropriate correction value should be applied when designing for its angle of ground movements. 展开更多
关键词 mining engineering underground mining ground movement horizontal stress COLUMN cantilever pillar
下载PDF
Science of empirical design in mining ground control 被引量:9
7
作者 Mark Christopher 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第3期461-470,共10页
Many problems in rock engineering are limited by our imperfect knowledge of the material properties and failure mechanics of rock masses. Mining problems are somewhat unique, however, in that plenty of real world expe... Many problems in rock engineering are limited by our imperfect knowledge of the material properties and failure mechanics of rock masses. Mining problems are somewhat unique, however, in that plenty of real world experience is generally available and can be turned into valuable experimental data.Every pillar that is developed, or stope that is mined, represents a full-scale test of a rock mechanics design. By harvesting these data, and then using the appropriate statistical techniques to interpret them,mining engineers have developed powerful design techniques that are widely used around the world.Successful empirical methods are readily accepted because they are simple, transparent, practical, and firmly tethered to reality. The author has been intimately associated with empirical design for his entire career, but his previous publications have described the application of individual techniques to specific problems. The focus of this paper is the process used to develop a successful empirical method. A sixstage process is described: identification of the problem, and of the end users of the final product; development of a conceptual rock mechanics model, and identification of the key parameters in that model;identification of measures for each of the key parameters, and the development of new measures(such as rating scales) where necessary; data sources and data collection; statistical analysis; and packaging of the final product. Each of these stages has its own potential rewards and pitfalls, which will be illustrated by incidents from the author's own experience. The ultimate goal of this paper is to provide a new and deeper appreciation for empirical techniques, as well as some guidelines and opportunities for future developers. 展开更多
关键词 Design Pillar Stope Empirical Statistics Modeling
下载PDF
Effect of the off-road terrains on the ride comfort of construction vehicles 被引量:1
8
作者 Nguyen Van Liem Zhang Jianrun +1 位作者 Jiao Renqiang Du Xiaofei 《Journal of Southeast University(English Edition)》 EI CAS 2019年第2期191-197,共7页
In order to evaluate the impact of off-road terrains on the ride comfort of construction vehicles,a nonlinear dynamic model of the construction vehicles interacting with the terrain deformations is established based o... In order to evaluate the impact of off-road terrains on the ride comfort of construction vehicles,a nonlinear dynamic model of the construction vehicles interacting with the terrain deformations is established based on Matlab/Simulink software.The weighted root mean square(RMS)acceleration responses and the power spectral density(PSD)acceleration responses of the driver s seat heave,the pitch and roll angle of the cab in the low-frequency region are chosen as objective functions under different operation conditions of the vehicle.The results show that the impact of off-road terrains on the driver s ride comfort and health is clear under various conditions of deformable terrains and range of vehicle velocities.In particular,the driver s ride comfort is greatly affected by a soil terrain while the comfortable shake of the driver is strongly affected by a sand terrain.In addition,when the vehicle travels on a poor soil terrain in the frequency range below 4 Hz,more resonance peaks of acceleration PSD responses occurred than that on a rigid road of ISO 2631-1 level C.Thus,the driver s health is significantly affected by the deformable terrain in a low-frequency range. 展开更多
关键词 construction vehicles vehicle dynamic model off-road terrains ride comfort
下载PDF
无人机地面滑行自主起飞的建模与控制 被引量:6
9
作者 贺成龙 陈欣 李春涛 《航空学报》 EI CAS CSCD 北大核心 2008年第B05期215-219,共5页
前三点式无人机地面滑行起飞的整个过程由三轮滑行、抬前轮滑行和离地至安全高度3个阶段组成,3个阶段飞机的受力与约束均不相同。根据3个阶段的运动特性和飞机的气动特性,建立了一种通用的无人机地面纵向动力学模型,确定其抬前轮速度和... 前三点式无人机地面滑行起飞的整个过程由三轮滑行、抬前轮滑行和离地至安全高度3个阶段组成,3个阶段飞机的受力与约束均不相同。根据3个阶段的运动特性和飞机的气动特性,建立了一种通用的无人机地面纵向动力学模型,确定其抬前轮速度和离地速度,从而选择合适的控制策略来实现其自主起飞。以某型无人机为背景,建立了全量的非线性模型,并在此基础上设计了一种起飞的控制方案。仿真结果表明,此模型与控制方案具有较高的工程应用价值。 展开更多
关键词 无人机 地面力学模型 抬前轮速度 自主起飞
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部