Research about the arrangement of the lifted suspension under the minimum turning radius of tractors

2011 ◽  
Author(s):  
Luo Wei Dong ◽  
Xiao Jun
Keyword(s):  
Turning Radius ◽  
Minimum Turning Radius

A Multi-Purpose Off-Line Path Planner Based on an A* Search Algorithm

1996 ◽  
Author(s):  
Arturo L. Rankin ◽  
Carl D. Crane
Keyword(s):  
Search Algorithm ◽  
Piecewise Linear ◽  
Autonomous Mobile Robot ◽  
Linear Path ◽  
Shortest Distance ◽  
Computer Controlled ◽  
Turning Radius ◽  
Minimum Turning Radius ◽  
Path Planner ◽  
Line Path

Abstract Efficient navigation of an autonomous mobile robot through a well-defined environment requires the ability of the robot to plan paths. An efficient and reliable planar off-line path planner has been developed that is based on the A* search method. Using this method, two types of planning are accomplished. The first uses a map of all known obstacles to determine the shortest-distance path from a start to goal configuration. The second determines the shortest path along a network of predefined roads. For the most complicated environment of obstacles and roads, a near-optimal piecewise-linear path is found within a few seconds. The planner can generate paths for robots capable of rotation about a point as well as car-like robots that have a minimum turning radius. For car-like robots, the planner can generate forward and reverse paths. This software is currently implemented on a computer controlled Kawasaki Mule 500 all-terrain vehicle and a computer controlled John Deere 690 excavator.

Size-dependent behavior of laminates with curvilinear fibers made by automated fiber placement

2015 ◽  
Vol 22 (2) ◽  
pp. 157-163 ◽  
Author(s):  
Mahdi Arian Nik ◽  
Larry Lessard ◽  
Damiano Pasini
Keyword(s):  
Variable Stiffness ◽  
Buckling Load ◽  
Fiber Placement ◽  
Plate Size ◽  
Load Increase ◽  
Automated Fiber Placement ◽  
Fiber Path ◽  
Turning Radius ◽  
Curvilinear Fibers ◽  
Minimum Turning Radius

AbstractVariable stiffness laminates can be manufactured using curvilinear fiber paths. A curvilinear fiber path is generally defined based on the plate size and has a curvature that is dependent on the plate size. In practice, however, the fiber path must satisfy manufacturing constraints, such as the minimum turning radius imposed by the automated fiber placement machine, thereby limiting the possible amount of fiber steering. In this work, we studied the effect of the plate size on the structural properties of a plate manufactured with curvilinear fibers. We considered four plate sizes, which were designed by a constant curvature fiber path. We optimized the plates for both maximum buckling load and in-plane stiffness. The results showed that the in-plane stiffness of the plate was not controlled by the plate size, whereas the buckling load was highly affected by the curvature of the fiber path. Hence, the potential of a buckling load increase reduced for plate sizes smaller than the minimum turning radius. In addition, for a given maximum curvature of the fiber path, the influence of a complex layup on the buckling load was marginal.

Main Parameters Calculation and Performance Test of 7YGS-45 Type Self-Propelled Dual-Track Orchard Transport

2012 ◽  
Vol 499 ◽  
pp. 232-237
Author(s):  
Jun Jun Xing ◽  
Shan Jun Li ◽  
Yan Lin Zhang
Keyword(s):  
Power Consumption ◽  
Performance Test ◽  
Slope Angle ◽  
Operation Performance ◽  
Running Speed ◽  
Turning Radius ◽  
And Performance ◽  
Minimum Turning Radius ◽  
Parameters Calculation

Targeting mountain orchards, which slope from 25 degrees to 45 degrees, the 7YGS-45 type self-propelled dual-track orchard transport was developed. Through designing，optimize the following key parameters such as power consumption、running speed、turning radius and slope angle, and have real operation performance test for dual-track orchard transport. The test shows that the transport’s maximum climbing slope is 47°, minimum turning radius is 8m, and it can satisfy the steady running with the speed of 1.1m/s-1.3m/s and capacity of 300kg. The 7YGS-45 type self-propelled dual-track orchard transport is not only suitable for transporting the fruits and fertilizers in mountain orchards, but also can be equipped with spraying and pruning machines to work.

The Turning Radius Analysis for Pneumatic Beam Transport Trailer of Principal and Subordinated Vehicle Model with Combination of Four-Wheel Steering and Articulated Frame

2012 ◽  
Vol 253-255 ◽  
pp. 2181-2187
Author(s):  
Zhen Jun Sun ◽  
Xiao Fei Yan ◽  
Li Jun Han
Keyword(s):  
Calculation Formula ◽  
Beam Transport ◽  
Vehicle Model ◽  
Turning Radius ◽  
Minimum Turning Radius

This paper put forward a struction model of pneumatic beam transport trailer of principal and subordinated vehicle model with combination of four-wheel steering and articulated frame. Its steering conditions are analyzed. The steering condition and the method of determining of the minimum turning radius and the calculation formula of turning radius are obtained.

Construction of Barrier in a Three-Player Pursuit-Evasion Game

2016 ◽  
Vol 04 (01) ◽  
pp. 41-49 ◽  
Author(s):  
Xinxing Li ◽  
Zhihong Peng ◽  
Wenzhong Zha ◽  
Jie Chen
Keyword(s):  
Explicit Form ◽  
Optimal Strategies ◽  
The State ◽  
Capture Zone ◽  
Pursuit Evasion ◽  
Evasion Game ◽  
Target Set ◽  
Turning Radius ◽  
Minimum Turning Radius

This paper addresses a particular pursuit-evasion game with two pursuers with slower speed but smaller minimum turning radius and a faster evader with bigger minimum turning radius. This is a game of kind, and what interests us is how to construct the barrier that separates the state zone into capture zone and escape zone, and what the optimal strategies for the players are on the barrier. Under some mild assumptions, we give the explicit form of the barrier near the BUP (i.e., the boundary of the usable part on the boundary of the target set) by using Isaacs’ method, and a procedure to construct the barrier when the retrogressive time is big enough by determining the optimal strategies for the players on the BUP. Then we prove that the optimal strategies remain unchanged near some special parts on the BUP, and we give two examples to illustrate these situations.

scholarly journals Mechanical Description of a Hyper-Redundant Robot Joint Mechanism Used for a Design of a Biomimetic Robotic Fish

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
M. O. Afolayan ◽  
D. S. Yawas ◽  
C. O. Folayan ◽  
S. Y. Aku
Keyword(s):  
Robotic Fish ◽  
Biologically Inspired ◽  
Redundant Robot ◽  
Critical Part ◽  
Joint Mechanism ◽  
Biomimetic Robotic Fish ◽  
Computerized Simulation ◽  
Turning Radius ◽  
Minimum Turning Radius ◽  
Biologically Inspired Robot

A biologically inspired robot in the form of fish (mackerel) model using rubber (as the biomimetic material) for its hyper-redundant joint is presented in this paper. Computerized simulation of the most critical part of the model (the peduncle) shows that the rubber joints will be able to take up the stress that will be created. Furthermore, the frequency-induced softening of the rubber used was found to be critical if the joints are going to oscillate at frequency above 25 Hz. The robotic fish was able to attain a speed of 0.985 m/s while the tail beats at a maximum of 1.7 Hz when tested inside water. Furthermore, a minimum turning radius of 0.8 m (approximately 2 times the fish body length) was achieved.

Calculation and Analysis of Minimum Turning Radius of Articulated Electric-Wheel Material-Carrier Based on ADAMS

2014 ◽  
Vol 556-562 ◽  
pp. 1092-1095
Author(s):  
Shuang Long Li ◽  
Wei Xiong
Keyword(s):  
Virtual Prototype ◽  
Motion Simulation ◽  
Vehicle Model ◽  
Full Vehicle ◽  
Turning Radius ◽  
Minimum Turning Radius ◽  
Prototype Software ◽  
The Relationship ◽  
Wheel Material

Calculate the minimum turning radius of articulated material-carrier in theory, and establish a full-vehicle model for motion simulation to obtain the minimum turning radius with the application of virtual prototype software ADAMS, then compare the theoretical value with simulation value. Analyze the relationship between the position of articulated point in the material-carrier and the minimum turning radius.

scholarly journals Maneuverability Analysis of a Novel Portable Modular AUV

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Xiaoming Wang ◽  
Shengguo Liang
Keyword(s):  
Dynamic Performance ◽  
Vertical Plane ◽  
Maximum Velocity ◽  
Reference Value ◽  
Parameters Tuning ◽  
Turning Radius ◽  
Minimum Turning Radius ◽  
Differential Control ◽  
Thrust And Torque

ZFAUV is a novel portable modular AUV. There are four fixed thrusters at tail, and two tunnel thrusters are set at front. The maneuverability of ZFAUV is relatively high. It can turn around in situ, move lateral or move up/down vertical. The yaw and pitch can be controlled by tunnel thrusters or differential control of tail thrusters, but differential control will reduce the forward force. Different from propeller-rudder AUVs, the turning radius is related to speed forward: the smaller the speed forward, the smaller the turning radius. The minimum turning radius tends to be zero. The mathematical model is built first; then CFD is used to predict the thrust and torque of tail thrusters and tunnel thrusters. Through numerical simulation, zigzag maneuver analysis in horizontal plane, and trapezoidal steering maneuver analysis in vertical plane, the maneuverability of ZFAUV is obtained. The maneuverability of ZFAUV becomes worse with the increase of speed. The maneuverability of differential control is better than that of tunnel control. In the case of specific thrust distribution of tail thrusters and tunnel thrusters, ZFAUV can turn around in situ (the maximum angular velocity is about 24.1°/s), move lateral or move up/down vertical (the maximum velocity is about 0.4m/s). Finally, an example, PID parameters tuning, is given to illustrate the application of maneuverability analysis. The dynamic performance of ZFAUV can be quickly and accurately analyzed by mathematical method, which has important guiding significance for the choice of control strategy and experiments and also has reference value for the later development of AUVs.

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