Yueyang Vocational Technical College

Yueyang, China

Yueyang Vocational Technical College

Yueyang, China

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Zhong B.,Yueyang Vocational Technical College
Applied Mechanics and Materials | Year: 2011

The standard genetic algorithm is improved by introducing the engineering treatment method of design vector in order to solve the optimization problem with mixed-discrete variables. A program of improved genetic algorithm has been designed. It can be used to solve the optimal design problems with continuous variables, discrete variables or mixed-discrete variables. For a dimension chain, the fuzzy-robust design of dimension tolerance is discussed and a model of fuzzy-robust design optimization is established. The solution of established model is achieved by using the improved genetic algorithm and the robustness of the dimension tolerance has been improved. The example shows that the proposed method is effective in engineering design. © (2011) Trans Tech Publications.


Yu B.Q.,Yueyang Vocational Technical College
Applied Mechanics and Materials | Year: 2013

For the special requirements of the radar antenna, a servo system was designed to drive a certain type of weather radar azimuth scan. The control segment consists of the PC and the stepper motor motion control card, in which the stepper motor was used as the actuator and the motor drive circuit was built by the specific integrated driver chips o f the stepper motor. By testing the vibration, the shock and the temperature of system, it shows that the designed azimuths scan servo system can meet the requirements of the weather radar azimuth scan. © (2013) Trans Tech Publications, Switzerland.


Huang Q.H.,Yueyang Vocational Technical College
Applied Mechanics and Materials | Year: 2014

Corner machining accuracy has always been one of the important properties of WEDM. In this paper, the reasons for the corner error of the WEDM were discussed. Then the mathematical deflection model of the electrode wire was established. By experimental measurements, the kerf width and the deflection of the electrode wire were obtained. Then the corner control strategy of the WEDM was proposed. Through experiment of the Comparison of corner error between control strategy with corner control and the one without corner control, it shows that the processing accuracy was improved effectively. © (2014) Trans Tech Publications, Switzerland.


Sun P.,Yueyang Vocational Technical College
Advanced Materials Research | Year: 2013

Toget complicated curved surface parts in wire cut electronic discharge machining, a rotary CNC processingtable was designed.Through establishing the mathematical equations of the general motion form, the several major processed forms are obtained. Then the processing system and its experimental device were established. Through machining experiment and error analysis, it shows that the system has high machining quality and low cost and has practical applicability, to produce a novel research direction for solving the difficult problems of machining spatial curved surface parts. © (2013) Trans Tech Publications, Switzerland.


Fang J.X.,Yueyang Vocational Technical College
Advanced Materials Research | Year: 2014

According to the chattering problem in the traditional sliding mode observer of the position sensorless control of brushless DC motor, a novel quasi sliding mode observer for rotor position estimation was proposed, which took the error between the actual and estimated currents as sliding surface and tracked the actual rotor position according to the mathematical relationship of back EMF and speed of the motor. Then the sensorless control system of the brushless DC motor based on the novel sliding mode observer was designed. Simulation results showed that the novel sliding mode control method could improve the rotor position estimation accuracy and effectively suppress the chattering problem to enhance the robustness of system. © (2014) Trans Tech Publications, Switzerland.


Huang Q.H.,Yueyang Vocational Technical College
Advanced Materials Research | Year: 2014

Tool nose radius compensation function is widely used in the numerical control turning, it is the key and difficult point for the numerical control turning. Correct and flexible use of tool nose radius compensation function is very important for the machining precision control of conical surface, circular surface and curved surface and improving the service life of the cutting tool. © (2014) Trans Tech Publications, Switzerland.


Zhou S.,Yueyang Vocational Technical College
Combinatorial Chemistry and High Throughput Screening | Year: 2014

Farnesyltransferase (FTase) and geranylgeranyltransferase type-I (GGTase-I) are two members of protein prenyltransferases, which play critical roles in lipid post-translational modifications. Potent inhibitors of FTase and GGTase-I have been confirmed to show favorable influence on the therapies of various diseases, such as cancers, malaria and Toxoplasmosis. However, designing highly specific inhibitors toward FTase or GGTase-I without influencing their binding affinity remains a big challenge. In this work, molecular docking, molecular dynamics (MD) simulations and MM/GBSA free energy calculations were employed to study the bindings of two highly selective inhibitors (lonafarnib and GGTI-2133) towards FTase or GGTase-I. The specificities of the studied inhibitors derived from the predicted binding free energies are consistent with the experimental data. The analysis of the energetic components illustrates that both the non-polar and polar interactions play critical roles in determining the specificity between FTase and GGTase-I. Moreover, the protein-inhibitor interaction spectra for the studied inhibitors were determined through the decomposition of the binding free energies, and the important residues for binding and specificity were highlighted. Our study provides useful information for the rational design of selective FTase or GGTase-I inhibitors. © 2014 Bentham Science Publishers.


Huang Q.H.,Yueyang Vocational Technical College
Advanced Materials Research | Year: 2014

Five-axis CNC machine tools are constituted by three-axis machine tools and two rotational degrees of freedom. Using the two rotary axes, five-axis CNC machine tools can improve the accessibility and become an important means of machining complex surface parts. In order to get high tapered complicated curved surface parts, a dual turntable five-axis machine with A-C tables was introduced and the mathematical models of the CNC processing of the workpiece were established. Through machining experiment of the several major processed forms, it shows that the dual turntable five-axis machine system has high machining quality and could be used to machine the difficult-to-cut materials, spatial complicated curved surface parts and special requirements. © (2014) Trans Tech Publications, Switzerland.


Huang Q.H.,Yueyang Vocational Technical College
Advanced Materials Research | Year: 2014

User macro-program can realize modularization programming by the variables. According to geometric information and mathematical model of parts, the programmer makes programs of modularization. Then, the parts of same shape but different specifications can be programmed when the information such as parameters of parts processing is input corresponding module statement, which reduces the frivolous and repetitive programming work and improves the efficiency of programming. © (2014) Trans Tech Publications, Switzerland.


Sun P.,Yueyang Vocational Technical College
Applied Mechanics and Materials | Year: 2013

The effect of the lateral vibration of the electrode wire on machining gap of CNC was analyzed. Then the vibration mathematical model of the wire electrode was established, and the influence of various parameters on the vibration and machining gap was revealed. Taking 1 mm wire as example, the influence low of the parameters on vibration of wire electrode was obtained. It shows that the vibration model is correct, to provide a reference for optimizing the machining gap of CNC. © (2013) Trans Tech Publications, Switzerland.

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