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Chen L.,Dalian Yiliya Construction Machinery Co. | Teng R.,Dalian University of Technology | Zheng Y.,Dalian University of Technology | Chi H.,Dalian University of Technology | And 2 more authors.
Lecture Notes in Electrical Engineering | Year: 2015

The Y-shaped telescopic boom guying system offers remarkable increases in load capacity of all-terrain crane. However, there are very few articles reporting on this special structure. Because the telescopic boom with Y-shaped guying system is a statically indeterminate space structure of quartic, it cannot be solved by an analytical method and there are no complete qualitative analyses of results. On the one hand, the front guyrope has played a positive role because the pull force partially weakens the bending moment and the deformation of boom head and decreases the stress of the bottom cover plate on the telescopic boom. On the other hand, it has played negative effects due to increasing the axial pressure and the stress of the top cover plate on the telescopic boom. The length and opening angle of guying frame balance the load distributions of working process between the revolution plane and luffing plane. In this paper, the all-terrain crane is simplified as a model which includes the telescopic boom, guying frame, front guyrope and back guyrope in this paper. The eigenvalue buckling analysis of finite element method is used to research the influence of Y-shaped opening angle on the crane maximal lift load decided by buckling stability. The research results show that the critical lifting load determined by stability increases first and then decreases with the increment of the opening angle of guying frame. The bigger of the opening angle, the larger of the pulling force component of guyrope in the revolution, and the better stability in this plane. However, the increasing opening angle will decrease the stability in the luffing plane. The optimal range of the opening angle is between 70° and 100°, which can balance the revolution plane stability and the luffing plane stability. This conclusion might be useful for the design of the Yshaped guying system of cranes. © Springer-Verlag Berlin Heidelberg 2015.

Wang X.,Dalian University of Technology | Wang C.,Dalian University of Technology | Zhou Y.,Dalian University of Technology | Xu J.,Dalian Yiliya Construction Machinery Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

Based on Timoshenko theory, a truss boom can be simplified into Timoshenko beam. A mathematical model based on such simplification was set up and aimed at minimizing buckling strain energy. The optimization analysis program was formulated in MATLAB, and the improved genetic algorithm was adopted to optimize the joint point distribution of the truss boom head section. Comparison of the overall stability of the optimal and the original results was used to verify the reasonability of the proposed model. The proposed model can be used effectively for optimizing the joint point distribution of the truss boom head section.

Xuyang C.,Dalian University of Technology | Pengfei L.,Dalian University of Technology | Rongyao S.,Dalian University of Technology | Xin W.,Dalian Yiliya Construction Machinery Co. | Shunde G.,Dalian University of Technology
Journal of Convergence Information Technology | Year: 2012

The simulation of straight trajectory control on telescopic boom aerial work platform has been researched. The motivation of the research is to improve productivity and safety of the work platform by advanced control system. The system consists of a microcomputer-based controller, sensors and hydraulic actuators. The control algorithm is the combination of feedback and feedforward control and static deflection compensation. The effect of this algorithm is verified by co-simulation.

Cao X.,Dalian University of Technology | Yuan J.,YTO Group Corporation | Li W.,Dalian Yiliya Construction Machinery Co. | Ding C.,Dalian Shipbuilding Industry Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

Aiming at the problems of poor precision, low operation efficiency and low security due to the load oscillation of luffing motion for crane, an error asymptotic compensation control method was proposed to minimize the sway angle of load. Based on the analysis of error asymptotic compensation control theory, the error asymptotic compensation controller was designed. Through appropriate adjustments to the two stage compensation coefficients, the sway angle of the lifted load was gradually decreased, meanwhile, the requirements of the acceleration and the pump displacement were met. The MATLAB simulation results show that error asymptotic compensation controller has good robustness and control precision for different ropes and jib lengths. After the crane began to brake, the sway angle is reduced to below 0.003 rad in 10 seconds. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved.

Li S.,Dalian University of Technology | Teng R.-M.,Dalian University of Technology | Wang X.,Dalian University of Technology | Wang D.-L.,Dalian University of Technology | Li J.,Dalian YILIYA Construction Machinery Co.
Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology | Year: 2016

The folding boom is widely used in aerial work fire-trucks (AWFs). In order to improve AWFs' working performance, an important way is to control the dynamic response of the tip platform during operation, whose foundation is how to solve the bending vibration equation of the boom system. As an example of folding boom system of 110 m AWF, the bending vibration equations for each boom are established, and then, the first three-order deflections curves of vibration shape function and corresponding natural frequencies of the first and second booms are obtained by the Hamilton principle. According to the elevation angle of the second boom, response curves of the dynamic deflections of the first and second booms tip are simulated in Simulink with this actual case. This study provides theoretical preparation for vibration control of AWFs tip platform. © 2016, Editorial Office of Journal of Dalian University of Technology. All right reserved.

Wang X.,Dalian University of Technology | Yi H.,Dalian University of Technology | Zhao R.,Dalian Yiliya Construction Machinery Co. | Xiao H.,Dalian University of Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2014

For the stability of n-order variable cross-section compression bars, the differential equations concerning the flexible curve equation were established. Based on the boundary conditions of neighbored-order, a critical load coefficient equation was built by solving the differential equations. And Newton iteration method was applied to calculate the critical load. As a case of telescopic boom for 1200 ton all-terrain crane, comparison results of calculation were analyzed among Newton iteration method, secant method and stability of ANSYS, which indicate the rationality of the critical load coefficient equation and efficiency of Newton iteration method.

Teng R.,Dalian University of Technology | He H.,Dalian YILIYA Construction Machinery Co. | Xiang H.,Dalian YILIYA Construction Machinery Co. | Gao S.,Dalian University of Technology
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

Large-scale aerial work platform (AWP) truck is a special equipment used for rescuing and firefighting for high buildings. To solve the trajectory planning problem for AWP with multi-joint in motion, a collision avoidance method is proposed based on heuristic path-searching in the luffing plane containing obstacles. The boom system with multi-degree-of-freedom is modeled parametrically in accordance with the real structure, and the D-H (Denavit-Hartenberg) parameters and homogeneous transformation matrix are listed. Then the collision condition for the booms and the enveloping circle is analyzed based on the simplified model of the obstacle. The path is searched in the 4-dimensional configuration space by using heuristic A* algorithm in Matlab program. Numerical simulation result of PTP shows that the booms avoided the obstacle successfully. Finally the appraisal function of the path searching for booms of AWP which comprises both prismatic and revolute joints is researched, and the optimal trajectory which contains minimum nodes and costs minimum time is acquired. © 2013 Journal of Mechanical Engineering.

Wang X.,Dalian University of Technology | Liu X.,Dalian University of Technology | Cao X.,Dalian University of Technology | Zhou F.,Dalian Yiliya Construction Machinery Co. | And 2 more authors.
Applied Mechanics and Materials | Year: 2012

By reasonable assumption and considering the friction, contact, preload intensity, load eccentricity, bolt bending, and other nonlinear factors, we establish three-dimensional finite element model for the high duty bolted joint to reflect the bolt behavior and develop the finite element calculation method for static strength, fatigue strength and related stresses of bolt. By this method, we do numerous numerical simulation experiments to study the effects of preload intensity, support plate thickness on the bolt behavior. These results will guide designer to complete the slewing bearing design effectively and accurately, and these research ideas can be well applied to bolted joints study in other devices.

Pan Z.,Dalian University of Technology | Wang X.,Dalian University of Technology | Teng R.,Dalian University of Technology | Teng R.,Dalian Yiliya Construction Machinery Co. | Cao X.,Dalian University of Technology
Computers in Industry | Year: 2016

In order to considerably reduce the overall time and cost associated with design process, it has been widely noted that data consistence and a unified software platform play a vital role in CAD/E integrated design. A novel modeling mechanism named as CADWE (Computer-Aided Design-While-Engineering) is proposed to merge CAD and CAE application into a unified pattern. Meanwhile,the CADWE maintains top-down modeling process and change propagation in complex product design. Preliminary model is adopted to build up consistent and shareable integration information model instead of focusing on programming to link different model to keep the consistence. Particularly, generalized feature and agent of preliminary geometry are put to use to achieve synchronous and automatic change propagation from preliminary geometry to detailed model and FEM application. Thus, not only numerous duplication and human error in complex simplification operation and incompatible data exchange may be avoided, but also much software development is dispensable. A software package is developed and used in change propagation with the aid of NX/Open API. To explain the CADWE modeling process with more insight, two examples are used as the case studies. By means of the comparison with the techniques in the literatures high relevant to this topic, it proves that the CADWE technology is good at handling complicated product modeling and their change propagation with little software development. © 2015 Elsevier B.V. All rights reserved.

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