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Yushan, China

Zeng Y.,Hefei University of Technology | Geng S.,Hefei University of Technology | Feng L.,Hefei University of Technology | Zhou B.,Sany Heavy Machinery Co
Proceedings of 2015 International Conference on Fluid Power and Mechatronics, FPM 2015

This paper introduces application and hydraulic system's working principle of the Multi-DOF hydraulic arm, adopts the power bond graph to establish the mathematical model of the hydraulic system, and uses the Matlab software to draw the Bode diagram of the open-loop system. The stability and other time domain performance of the hydraulic system are analyzed by using the engineering control theory, the results show that, on the premise of guaranteeing the system stability, the system could obtain good time domain performance, through increasing the open-loop gain coefficient properly. The results of simulation are useful for the design and dynamic analysis of the hydraulic system. © 2015 IEEE. Source

Yao Z.,Wuhan University of Technology | Qian Z.,Wuhan University of Technology | Wang J.,Sany Heavy Machinery Co
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings

In this paper, the energy balance analysis of diesel engine system is introduced, and a medium-speed diesel engine was used as a research object to build simulation models. The correctness of model was verified by comparing simulation data to experimental result. The energy balance on thermodynamic cycle is analyzed by combining the results of simulation data and theoretical analysis to evaluate the energy efficiency of this diesel engine. Factors of energy efficiency are pointed out by theoretical analysis, and the result of the research on effects caused by changes of parameters is been used to pointing out the path of improving the energy efficiency of diesel engines. © 2011 IEEE. Source

Du J.,Wuhan University of Technology | Qian Z.,Wuhan University of Technology | Zhao J.,Sany Heavy Machinery Co
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings

A single crankshaft of 8L250 diesel engine using a finite element model is established, which used Pro-E and ANSYS-workbench software in this paper, and a finite element analysis is done in force and displacement boundary conditions. The maximum stress point is found, and under the premise of not affecting the basic structure of the crankshaft the optimization improvements to reduce the stress concentration are presented, and the specific methods for quantitative analysis are executed so that the crankshaft will achieve to the best result of optimization. © 2011 IEEE. Source

Qin S.-D.,Jiangsu University | Qin S.-D.,Sany Heavy Machinery Co | Wang S.-Q.,Jiangsu University | Chen N.-L.,Jiangsu University
Jinshu Rechuli/Heat Treatment of Metals

Steel-cast iron dry sliding pairs are used on pin-on-disk configuration to study the wear behaviors of gray cast iron, corresponding wear laws are found and the wear mechanisms of gray cast iron under various service conditions are explored using XRD, SEM and EDS means. The results show that with the increase of applied load, the wear rate increases slowly first, then sharply, at last the increase rates become slow under those ambient temperatures tested, however, the average friction coefficient decreases gready at first, then tends to a definite value. At room temperature, adhesive wear and abrasive wear mechanisms are dominant. While at the surrounding temperature of 200 °C, wear mechanism is mainly adhesive wear and mild oxidation wear, however, there will be appearing massive spalling. At the surrounding temperature of 400 °C, the dominant wear mechanism is mild oxidative-wear and abrasive wear when the applied load is small; as the applied load increasing, the wear mechanism turns into severe oxidation-wear and abrasive wear; massive spalling and plastic extrusion will be appeared after the applied load large enough. Source

Sany Heavy Machinery Ltd | Date: 2012-12-04

This present invention discloses an engine-driven generator rotational speed control method. The method comprises the following steps, obtaining n-IA1 curve, n-IA2 curve, n-DCLV curve and DCLV-n curve through the generator open-loop characteristic curve; determining whether the current work area of the generator is the saturation area, the transition area or the linear area, and meanwhile determining the 1.1-times DCLV work area. The present invention adjusts the generator objective rotational speed by determining the state of the generator, and outputs the generator objective rotation rotational speed by the method of dynamic discrete, so as to ensure the responsiveness of the DC output voltage of the generator, to extend the service life of the generator, and to make the generator work in a more efficient state.

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