Analysis of a Kinematic Model for a Forestry Six-Wheeled Luffing Articulated Vehicle Chassis

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2 Forestry Six-Wheeled Luffing Articulated Vehicle Chassis The Open Mechanical Engineering Journal, 215, Volume left rear leg. Two articulated steering electric putters control the retractable steering. The right-front leg (coordinate 8 in Fig. 1) is connected to the rear frame though the rear leg body hinge point, and the articulated structure of the V - shaped wheel leg (coordinate 13, Fig. 1) facilitates climbing Fig. (1). Six-wheeled luffing articulated chassis and virtual prototype: 1. electric putter 1; 2. right-front wheel leg; 3. hinge point of the V -shaped structure; 4. electric putter 2; 5. chassis body hinge point of the right-front wheel legs; 6. articulated steering electric putter 3; 7. chassis body hinge point of right rear wheel legs; 8. right rear wheel legs; 9. electric putter 4; 1. rear frame; 11. articulated steering hinge point; 12. front frame; and 13. V -shaped wheel leg Chassis Coordinate System Based on the D-H Method The six-wheeled luffing articulated chassis, as a vehicle travel mechanism, consists of four separate wheeled legs that work cooperatively to complete the command function. The chassis coordinate system [6, 12, 13], shown in Fig. (2), is described below. The positive x-axis direction is defined as the forward direction. The right-front wheeled-leg coordinate systems are, in order, defined as Nos. 1, 3, and 5 (with 5 corresponding to the wheel center). The left-front wheeledleg coordinate systems are, in order, Nos. 2, 4, and 6 (the wheel center is 6). The right-rear wheeled-leg coordinate systems are, in order, Nos. 9, 1, and 12 (the wheel center is 12). The left-rear wheeled-leg coordinate systems are, in order, Nos. 9, 11, and 13 (the wheel center is 13). The articulated steering joint coordinate system corresponds to No. 9. Fig. (2) shows the relationship among the coordinates, which is based on the D-H method; the D-H parameters for the wheel center coordinates (5, 6, 12, and 13) are listed in Table 1. The vertical dimensions between hinge points 1 and 2 and coordinate O ( a 1 and a 2, respectively) are a 1 = a 2 = 238 mm and between hinge points 1 and 11 and coordinate O ( a 3 and a 4, respectively) are a 3 = a 4 = 316 mm. The length of the front legs is L 1 = L 2 = 467 mm. The length of the front V -shaped legs is L 3 = L 4 = 31 mm. The length of the rear legs is L 1 = L 11 = 439 mm. The distance in the x-axis direction from hinge point 9 to the front part of the front frame is = 732 mm, and that to the back end of the P 1 rear frame is P 2 = 297 mm. The angle of the right-front wheeled-leg hinge point 1, with respect to the x-axis, is. Table 1. Devanit-Hartenberg (D-H) parameters. Frame θ D a α a 1 1 Right front leg 3 L 1 5 L 3 2 a 2 Left front leg 4 θ 2 L 2 6 θ 4 L P 1 Right rear leg 1 a p L P 1 Left rear leg 11 1 a p L 11

3 672 The Open Mechanical Engineering Journal, 215, Volume 9 Dongtao et al. The angle of the V -shaped leg hinge point 3, with respect to the x-axis, is. Similarly, the angles of the left-front wheeled leg with respect to the x-axis are and. The articulated steering angles of the right-rear wheeled leg and left-rear leg about the y-axis are and 1, respectively. The angles of the rear wheeled legs 8 and 9 about the z-axis are 2 and 3, respectively, as shown in Fig. (2). X R1 Z R1 1 L1 Z R12 θ12 12 a3 X R12 Fig. (2). Coordinate system of the six-wheeled luffing articulated chassis. 3. DERIVATION OF THE KINEMATIC MODEL The D-H method is a useful tool for space geometry kinematics. It is mainly based on the assumption that the robot is composed of a series of joints and connecting rods. Connecting rods can rotate around the joints, which can be placed in any order and in any plane. The length of a connecting rod is arbitrary (i.e., any value is possible, including zero) and can be bent or distorted for any plane. Any set of joints and connecting rods constitutes a robot model. A reference coordinate system is set at each joint. Transformations are performed to connect one joint to the next, up to the last joint. A series of transformation steps provides the total transformation for the robotic vehicle s motion Kinematic Model Based on the D-H Method Coordinates (, X, Y, Z ) are shown in Fig. (2). Based on the D-H method, if θ 2 θ 4 X L11 Z 1 L11 θ13 a4 Z9 X9 L11 Z L ZR T 1 X L13 1 L1 P2 θ1 describes the position and attitude of the first connecting rod relative to the reference coordinate system, then describes the position and attitude of the 1 T 2 second connecting rod relative to first connecting rod. The position and attitude of the second connecting rod in the reference coordinates is given by the following matrix product: A 2 = T 1 1 T 2 Z 3 a1 Y θ3 ZR2 XR2 O XR1 L3 5 P1 ZL1 a2 X XR5 ZR5 8 2 ZL2 θ2 XL1 4 XL2 L2 θ4 6 L4 XL6 ZL6 Z Y X In a similar way, A 3 describes the position and attitude of the third connecting rod to the second connecting rod, with A 3 = T 3 = T 1 1 T 2 2 T a3 1 a4 11 P2 θ11 9 Fig. (3). Structure diagram for the six-wheeled luffing articulated chassis Six-Wheeled Luffing Articulated Chassis Transform Matrix As an example, we use the right-front wheeled leg and right-rear wheeled leg to characterize the luffing motion. Fig. (3) shows the structure diagram for this example. Here, the left-front wheeled-leg structure (coordinates: 2, 4, 6, and 8) and the right-front wheeled-leg structure (coordinates: 1, 3, 5, and 7) have the same movement characteristics, as does the left-rear wheeled leg (coordinates: 9, 11, and 13) and the right-rear wheeled leg (coordinates: 9, 1, and 12). In the D-H method, the right-front wheeled leg (coordinates: 1, 3, 5, and 7) is defined as follows: cθ i sθ i a i 1 sθ i 1 T i = i cα i 1 cθ i cα i 1 sα i 1 d i sα i 1 sθ i sα i 1 cθ i sα i 1 cα i 1 d i cα i 1 cθ i sθ i cα i sθ i sα i a i cθ i sθ T i = i cθ i cα i cθ i sα i a i sθ i sα i cα i d i The relationship between the forward reference coordinate system and the right-front wheeled-leg coordinate system (coordinates: 1, 3, 5, and 7), as shown in Figs. (2, 3) and Table 1, can be calculated using the D-H method. The general form of each connecting rod s transformation matrix can be simplified as follows: T 1 = a 1 c 3 s 3 L 3 C 3 3 S T 5 = 3 C 3 L 3 S 3 1 P T 3 = a1 a 2 θ θ3 4 s 1 L 1 -s 1 L 1 s 1 1 θ 4 5 6

4 Forestry Six-Wheeled Luffing Articulated Vehicle Chassis The Open Mechanical Engineering Journal, 215, Volume The coordinate conversion of wheel center 5 (Figs. 2, 3), relative to the reference coordinates, is given by A 5 = T 5 = T 1 1 T 3 3 T 5, as shown below: a 1 c 3 s 3 L 3 C 3 S 3 C 3 L 3 S 3 1 The coordinate of the right-front wheel center (coordinate 5, Figs. 2, 3) in the reference coordinate system is as follows: P x = L 3 cos( ) + L 1 cos =-[ L 3 sin( ) + L 1 sin ] = a 1 Similarly, the coordinate of the left-front wheel center (coordinate 6, Figs. 2, 3) in the reference coordinate system is P x = L 4 cos(θ 2 θ 4 ) + L 2 cosθ 2 =-[ L 4 sin(θ 2 θ 4 ) + L 2 sinθ 2 ] = a Pose Transform of the Right Rear Wheel Center with Positive Kinematics T 9. (1) (2) (3) (4) (5) (6) represents the matrix converted from the basic coordinate (, X, Y, Z ) to coordinate 9; 9 T 1 is the converted matrix from coordinate 9 to coordinate 1; and is the converted matrix from coordinate 1 to 1 T 12 coordinate 12, as given below: T 9 = 1 p n x o x a x p x n = y o y a y n z o z a z s 1 L 1 -s 1 L 1 s L 1 1 s T 12 = 12 - L 1 1 s 1 L 1 a p 2 2 p 1 n x o x a x p x s 12 - L 1 n T 12 = = y o y a y s 1 s 1 - L 1 s 1 a p 2 2 s 1 n z o z a z The coordinates of the right-rear wheel center (coordinate 12, Figs. 2, 3) in the reference coordinate system are P x =L 1 a p 2 2 p 1 =L 1 =L 1 s 1 a p 2 2 s 1 The coordinates of the left-rear wheel center (coordinate 13, Figs. 2, 3) in the reference coordinate system are P x =L a p p 1 = L 11 s 13 =L 11 3 s 11 a p 2 2 s 11 (7) (8) (9) (1) (11) (12) 3.4. Theory Analysis of the Right-Front Wheeled-Leg Kinematics Model in the Luffing Process Luffing analysis for the y-axis was carried out on the right-front wheel leg. Based on the luffing motion, the displacement variation regulation of the V -shaped wheeled leg center (coordinate 5, Figs. 2, 3), relative to the point along the y-axis of the reference coordinate system, is given as follows: -s 1 a p T 1 = s 1 a p 2 2 s 1 1 Fig. (4). Schematic diagram of right-front wheeled leg luffing.

5 674 The Open Mechanical Engineering Journal, 215, Volume 9 Dongtao et al. Fig. (4) shows the position relationship of each hinge point of the front wheeled-leg electric putters 1 and 2 ( A 1 A 2 and B 1 in Fig. 4). The installation angles of hinge points A 1 and A 2 are 9.5 and 17.7, respectively. The installation angles of hinge points and B 1 are and 17.6, respectively. The corresponding transformation is as follows: = A 1 AA = A 1 AA (2) As shown in Fig. (4), hinge joint (13) (14) between the front wheeled-leg of electric putter 1 and wheeled leg 2, hinge joint A 1 of the front frame 12(in Fig. 1), and hinge joint A of front wheeled leg 2 and front frame 12 make up the triangle AA 1 A 2, with AA 1 = 625 mm AA 2 =351 mm; A 1 A 2max = 44 mm ; A 1 A 2min = 32 mm, cos A 1 AA 2 =.73, and A 1 AA 2 = 43.1, when the initial displacement of electric putter 1 is at a maximum, namely, A 1 A 2max = 44 mm. After the transformation: max = A 1 AA = Similarly, cos A 1 AA (2) =.94, and A 1 AA (2) = 2.3 when the final displacement of electric putter 1 is at its minimum value, namely, A 1 A 2min = 32 mm. After the transformation: min = A 1 AA (2) = 28.5 Thus, changes from 51.3 to 28.5 when the displacement of electric putter 1 changes from a maximum of 44 mm to a minimum of 32 mm. Similarly, for electric putter 2, wheeled leg 2 and V - shaped leg 13 make up triangle B 1, with B 1 = 354 mm, B 1 max = 275 mm, B 1 min = 225 mm, and = 211 mm. The corresponding angle for B 1. When the initial displacement of electric putter 2 is at a minimum, cos B 1 =.8, B 1 = 36.9, and min = B 1 = When the final displacement of electric putter 2 is at a maximum, A 2 cos B (1) B (2) B (3) =.63, B (1) B (2) B (3) = 5.9, and max = B (1) B (2) B (3) = is The corresponding angle changes from 37.8 to 51.8 when electric putter 2 changes from a minimum displacement of 225 mm to a maximum displacement of 275 mm, as shown in Fig. (4). For the front wheel-legged mechanism, the right-front wheeled leg can reach a maximum in the y direction when reaches its minimum value ( min ) and reaches its maximum value ( max ), namely, = 28.5 and = 51.8, respectively. According to Eq. (2): front = mm (initial displacement relative to reference coordinate) and front max = -14mm (final displacement relative to the reference coordinate). The maximum range in the y direction is = (-14) = 33.8 mm. To verify the luffing rule, we set to be constant, namely, = Seven points were chosen at 2-mm intervals as test points as electric putter 1 changed from 44 mm to 32 mm. Corresponding values for and were calculated from Eqs. (13) and (2), respectively; 1 was negative because it changed in the negative y direction; remained unchanged when = Using six points at 1- mm intervals as test points as electric putter 2 changed from 225 mm to 275 mm, and were calculated using Eqs. (14) and (2), respectively. By analyzing the luffing process of the rear wheel-legged kinematics model (with actual installation angles of 1.28 and 25.4 ), (15) where α is the angle whose value changes with a change in the length of electric putter 4. For example, changed from 66 to 33.3 when the length of electric putter 4 changed from 47 mm to 35 mm. Using seven points at 2- mm intervals as test points as electric putter 4 changed from 47 mm to 35 mm, and (reference value relative to right-rear wheeled leg) were calculated using Eqs. (15) and (8), respectively; was negative because it changed in the negative y direction of the reference coordinate system; thus, coordinate) and (initial displacement relative to reference 12max = -241mm (final displacement relative to reference coordinates). 2 = α = -41mm The maximal amplitude range of the right-rear wheeled leg in the y direction is 2 fronty 1

6 Forestry Six-Wheeled Luffing Articulated Vehicle Chassis The Open Mechanical Engineering Journal, 215, Volume 9 675! 12Y = 41 ( 241) = 16mm 4. EXPERIMENTAL ANALYSIS 4.1. Simulation Experiment Automatic Dynamic Analysis of Mechanical Systems (ADAMS) is a virtual prototype analysis software by Mechanical Dynamics Inc. that provides mechanical system simulations based on multi-body system dynamics theory. It can be used to create a fully parameterized dynamic model of a mechanical system using an interactive graphic environment, a parts library, a constraints base, and a mechanical library. This virtual platform provides threedimensional (3-D) visualization of the system s motion in various simulation environments for design optimization. There are three basic modules for ADAMS: View, Solver, and Postprocessor. In this paper, the dynamics simulation of the obstacle-surmounting wheeled legs is based on the View module as showing in Fig. (5). Fig. (6). Motion measurement graphic of the front wheel linear actuator ANALYSIS AND COMPARISON After analyzing the kinetic characteristics of the wheel center 5 (in the right-front wheeled leg) as it encountered the luffing obstacle, we obtained measured and simulation curves for and 1, and 3, and 2 and 12, as shown in Fig. (7). 6. DISCUSSION Fig. (5). Motion simulation of right-front wheeled leg. The simulation data were derived, and the simulation curve of and corresponding were obtained using Microsoft Excel, based on the mapping relationships because ADAMS provides only the relationship between and time. In the same way, we obtained the simulation curves for and 3, and 2 and Test Method and Process Test method: Classical proportional integral derivative (PID) control theory was adopted via CODESYS software to control the ESPC industrial controller. The motion displacements of electric putters 1 and 2 were measured precisely using angle and displacement sensors. Test process: We used an electric putter with an L-linear motor (E5; speed: 1 mm s 1 ) as shown in Fig. (6). The strokes of electric putters 1 and 2 were 12 mm and 5 mm, respectively. The stroke of electric putter 4 wa mm. For electric putters l, 2, and 4, the test points were the same as the points chosen for the theoretical calculation (Section 2.4). The test point numbers of electric putters l, 2, and 4 were 7, 6, and 7, respectively. The test points were measured three times to obtain an average value. 1 1) In this study, the D-H method was adopted to establish a kinematics model of a six-wheeled luffing articulated chassis. According to the established kinematic model, a relationship between angle θ and was obtained. The model was tested through simulations and experiments. The experimental results indicated a model accuracy of 98.3%. The front and rear wheeled legs demonstrated a vertical lift of 33.8 mm and 16 mm, respectively, which is sufficient for climbing applications in forested areas with stump heights of less than 1 mm [14-16]. 2) Comparative analysis curves are shown in Fig. (7). The deviation between the simulation and theoretical curves was attributed to installation error and deformation of the chassis frame. For example, 1 was smaller, due to the installation error that occurs when θ1 ranges from 28.5 to Displacement deformation was the main influencing deviation factor when was in the range of 41.1 to ) Our analysis results showed that the maximum obstacle-surmounting height of the front wheeled legs and rear wheeled legs sufficiently met forestry production site conditions and forestry production demand for the chassis. The best barrier height was achieved by adjusting the position of the hinge points of triangles ΔAA 1 A 2 and ΔB 1 B 1. CONCLUSION A new type of six wheel-legged chassis for forestry production was designed. The D-H method was applied to establish a kinematics model of the chassis. Translation and rotation of the model s coordinate system allowed a positive motion attitude matrix to be obtained. The kinematics model

7 676 The Open Mechanical Engineering Journal, 215, Volume 9 Dongtao et al. was calculated and analyzed, and tested against simulation and experimental data. Simulations and experimental results were in good agreement with the kinematic model and its positive solution. Our results are expected to guide future developments in forestry equipment and motion dynamic advances. CONFLICT OF INTEREST The authors confirm that this article content has no conflict of interest. ACKNOWLEDGEMENTS This work is supported by the Fundamental Research Funds for the Central Universities TD The authors would like to thank Dr. Huang Qingqing, Sun Zhibo, Li Cun for their important contribution to this work. REFERENCES Fig. (7). Comparative analysis curves of 1 versus, 3 versus, and 12 versus 2. [1] J. Xin, X. Li, Z. Wang, C. Yao, and P. Yuan, Performance analysis of track-leg mobile robot in unstructured environment, Robot, vol. 26, pp , 24. [2] K. Iagnemma, H. Shibly, A. Rzepniewski, and S. Dubowsky, Planning and control algorithms for enhanced rough terrain rover mobility, In: International Symposium on Artificial Intelligence, Robotics and Automation in Space, Canadian Space Agency: Quebec, Canada, 21, pp.1-8. [3] A. Lamon Krebs, M. Lauria, R. Siegwart, S. Shooter, and P. Lamon, Wheel torque control for a rough terrain rover, In: IEEE International Conference on Robotics and Automation, Piscataway, IEEE: NJ, USA, 24, pp [4] M. Hu, Z. Deng, H. Gao, and S. Wang, Analysis of climbing obstacle trafficability on the six-wheeled rocker-bogie lunar rover. Journal of Shanghai Jiaotong University, vol. 39, pp , 25. [5] Y. Gao, X. Wu, and Z. Wu, Motion ability analysis and mechanism design for six-leg-wheel hybrid mobile robot, Machinery Design & Manufacture, vol. 6, pp , 23. [6] Y. Xiong, Robots, Mechanical Industry Press: Beijing, [7] Y. Chang, S. Ma, H. Wang, and D. Tan, Method of kinematic modeling of wheeled mobile robot, Journal of Mechanical Engineering, vol. 46, pp. 3-35, 21. [8] M. Song, Kinematics Analysis of the Multi-Motion Mode Wheel- Leg Robot, China: Hebei University of Technology, 212. [9] Z. Chen, and Q. Zhang, The application of D-H method in the kinematics modeling of five-axis coordinated machine tools. Machine Tool & Hydraulics, vol. 35, pp. 88-9, 27. [1] H. Song, and H. Xu, Kinematical analysis of the excavator working device based on D -H methodology, Construction Machinery, vol. 9, pp. 87-9, 212. [11] H. Ding, Y. Cao, Z. Yang, and L. Ma, Position kinematics analysis of multi-linkage face-shovel excavator and envelope plotting using D-H method, Journal of Yan Shan University, vol. 38, pp , 214. [12] M. Song, and M. Zhang, Kinematics analysis for parallel mechanism of basic-mobile robot, Journal of Agricultural Machinery, vol. 43, pp. 2-26, 212. [13] Y. He, W. Liu, and C. Zhou, Simulation of mutual motion between wheeled mobile robots and terrains, Robots, vol. 29, pp , 27. [14] C. Meng, and F. Pang, Research on Development of Stump, Forest Engineering, vol. 21, pp , 25.

8 Forestry Six-Wheeled Luffing Articulated Vehicle Chassis The Open Mechanical Engineering Journal, 215, Volume [15] S. Xiao, Research on suitable height of stump, Journal of Northeast Forestry University, vol. 27, pp , [16] C. Hong, R. Xue, and J. Han, Confirmation of best cutting root height on the sprouting regeneration of Urophylla, Forest Engineering, vol. 19, pp , 23. Received: February 17, 214 Revised: March 21, 215 Accepted: June 9, 215 Dongtao et al.; Licensee Bentham Open. This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

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