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Gao W.,Tianjin University | Chen Y.,Tianjin University | Hu Z.,Hunan Sunward Intelligent Machinery Co.
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings | Year: 2011

The 3-D models of the cylinder block of 4D25G Diesel Engine, were modeled with Pro/Engineer and reasonably simplified. Elements were applied to mesh 3-D geometric models, and then the FEM model was constructed. Using the model, a modal analysis was done to get the basic vibration mode and the nature frequency of the cylinder block. Through analysis for results, we can learn dynamic characteristic of the cylinder block. It can provide the direction in which the vibration and noise could be further reduced through the structural improvement. © 2011 IEEE.

Liang J.,Central South University | Chen Q.-G.,Central South University | Chen Q.-G.,Hunan Sunward Intelligent Machinery Co. | Chen Z.,Central South University | And 2 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2012

Closed hydraulic crawler crane slewing system composition and its working principle is analyzed, and control construction, working principle and its characteristic of electro-hydraulic proportional pump is studied in-depth. Furthermore, the mathematical modeling of main components of Rotary closed hydraulic system is built, based on that, the system simulation model is built by using AMESim, we tested the rationality of model we built through experiments and research, and obtained the effects of different auxiliary oil pressure, control slope and moment of inertia on system performance, setting an instruction of the crane slewing closed hydraulic system design, debugging and performance optimization.

He Q.-H.,Central South University | He Q.-H.,Hunan Sunward Intelligent Machinery Co. | Hao Q.-H.,Central South University | Li T.-H.,Central South University | And 2 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2011

In order to analyse complex hydraulic-mechanical coupling system of a certain excavator, the evaluation method based on digital virtual prototype was proposed. In order to be close to the practice, the hydraulic system model of the excavator was built by using hydraulic component design(HCD) in the software of Amesim. The assembly model of the excavator was established through the software of Pro/E, and the dynamic model of it was built under the circumstance of the software of Adams. The hydraulic-mechanical coupling model was built with the help of the interaction between the models of hydraulic system and dynamic system which forced by interface method. The actual test result showed the datas of the simulation was consistent of the test datas which verified the validity of the co-simulation model. The co-simulation model can be used to design the system, evalate the performance and optimize the system of the excavator. It provided a short development cycle and low-cost method to develop production.

He J.,Central South University | He J.,Hunan Sunward Intelligent Machinery Co. | Song J.,Central South University | Wei D.,Central South University | Rao S.,Central South University
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2011

Comparing to traditional control strategy used at hydraulic excavator, this paper presents a combination control strategy based on flow control and pressure control in order to achieve the stable of excavator's flow in the different working condition and to reduce the back pressure. According to this combination control scheme, the co-simulation model was established. And the simulation result indicated that this the control scheme is feasible. What's more, a PID control scheme based on the characteristics of the controlled object is designed to improve the system's dynamic response characteristics. At last, experiment was operated, and the results show the control scheme can reduce system's energy consumption effectively.

He Q.,Central South University | He Q.,Hunan Sunward Intelligent Machinery Co. | Zhu J.,Central South University | Wang S.,Central South University | Zuo J.,Central South University
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2011

The luffing mechanism of the telescopic handler is a key factor that affects the load capability of the derricking cylinder and pressure impact directly. Therefore, as for the luffing mechanism, getting an optimal position of hinge point will improve the working device on performance. Based on the analysis of the working characters of luffing mechanism, a mathematical model of multi-objective optimal design of luffing mechanism is established with unified objective function method, which regards the improvement of the force transmission ratio and the reduction of the oil pressure fluctuations as optimal objectives, the optimization calculation is presented by using the genetic algorithm toolbox of Matlab. The results indicate that the optimized result can enhance the performance of the telescopic.

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