Time filter

Source Type

Yuan X.-J.,South China University of Technology | Guo K.-H.,South China University of Technology | Guo K.-H.,Jilin University | Guo K.-H.,KH Automotive Technologies Changchun Co.
Meccanica | Year: 2015

In current research, the transverse motion of a thin annular plate is studied, thus determining the static and dynamic opening of a relief valve. Using the geometrically non-linear theory of thin plates, the governing equations in cylindrical coordinates are systematically deduced for obtaining the transient behavior. An equivalent method for replacing the concentrated force is innovatively proposed so that all of the loads of the plates can be given by a unified expression, which reduces the number of the governing equations and intermediate boundary conditions. Combining harmonic differential quadrature (HDQ) and method of solving ordinary differential equations, the governing equations are rapidly solved out. The results of the numerical method are verified with those of finite element analysis (FEA). Applying step loads, all of the theoretical values and FEA results give us insight into the attenuate vibration response of the relief valve, showing great ability of keeping steady positions and rapid dynamics. © 2015 Springer Science+Business Media Dordrecht


Zhang L.H.,Jilin University | Guo K.H.,Jilin University | Zhao F.X.,Jilin University | Chen S.Q.,KH Automotive Technologies Changchun Co.
Applied Mechanics and Materials | Year: 2014

The suspension kinematics and compliance (hereafter referred to as 'K & C') characteristics as the important system assembly characteristics have a direct effect on the vehicle handling and stability performance and the ride comfort performance. The suspension K&C test rig is an key equipment to obtain the suspension K&C characteristics. Calculation method of the target parameters of K&C test-rig is studied. The movement law of the suspension K & C test rig is analyzed by using the multi-body dynamics theory. Application Space rotation transformation matrix based on the measurement system structure is applied to solve the coordinates of the wheel center. Using the space vector operations and the definition of the toe angle and the camber angle, the solution method of the camber and toe angle is derived. The parralel wheel travel analysis using the multi-body dynamics model of the K&C test rig is taken. The simulation results when the rebound travel is -100mm is used to calculate the target parameters and verify the accuracy of the calculation method. © (2014) Trans Tech Publications, Switzerland.


Guo K.-H.,Jilin University | Zhang L.-H.,Jilin University | Chen S.-Q.,KH Automotive Technologies Changchun Co.
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2014

The test principle of a new six-freedom tire test bench and analytical method of tire load were studied. Using multi-body dynamics theory and rotational transformation matrix, the actuator lengths of tire test conditions were obtained. Considering the directions of the actuator forces, the force sensor measurement, the actuator vector, and the rotational transformation of the tire force when there was a side slip angle, the tire forces in three directions were solved. Using the actuator force vector, the vector of each actuator arm and the space vector operation, the tire moments were solved. A simulation model of the tire test bench was built. The camber test and the side slip test were simulated. Simulation results show that the solution method of the actuators motion law is correct. The tire multi-condition test was simulated. Simulation results indicate that the solution method for the six components computation of tire load is feasible.


Yuan X.,South China University of Technology | Guo K.,South China University of Technology | Guo K.,Jilin University | Guo K.,KH Automotive Technologies Changchun Co.
Science China Technological Sciences | Year: 2015

The current work is concerned with modelling and analysis for a pilot relief valve, thus successfully bringing a systematic method for designing and analyzing similar valves. The essence of the work is to solve two important problems, one for positions of the pilot valve influenced by flow force and the other is for the opening of the relief valve governed by a thin annular plate. The computational fluid dynamics (CFD) method is used to present the flow force. Using a series of experiments, the flow rate versus pressure drop shows the rationality of the CFD results. In order to obtain the opening of relief valve with higher accuracy, the large deflection theory of thin plates is adopted. An equivalent method for replacing the concentrated force is innovatively proposed so that all of the loads of the plates can be given by a unified expression, which reduces the number of the governing equations and intermediate boundary conditions. For presenting a very simple and reliable method for solving the governing equation, an unconstrained nonlinear optimization is innovatively introduced to solve the deflection of the thin annular plate. Being verified by finite-element method (FEM) of the relief valve, the equivalent method and optimization can solve deflection of thin plates rapidly and accurately. Reflected through a complete model for the pilot relief valve, the theoretical flow rate of the pilot relief valve is consistent with experimental conclusion. Once again, the comparisons bring us insight into the accuracy of the method adopted in the current work. © 2015, Science China Press and Springer-Verlag Berlin Heidelberg.


Zhang L.H.,Jilin University | Guo G.,Jilin University | Chen C.,KH Automotive Technologies Changchun Co.
Applied Mechanics and Materials | Year: 2013

Target parameters of the K&C test-rig is introduced in this paper. Establish McPherson independent suspension and K&C test-rig multi-body dynamics model.The measurement data of angle sensors is obtained in the wheel travel simulation. Accuracy analysis of target parameters when there are machining errors, installation errors and calibration errors in the measuring system. Accuracy analysis of target parameters when using the different measurement precision angle sensor. Comprehensively consideration of the measuring system all error factors, the accuracy is analyzed. The coordinate error of the installation point between measuring plate and the hub has greater effect on the toe and camber calculation. © (2013) Trans Tech Publications, Switzerland.


Yuan X.,South China University of Technology | Guo K.,Jilin University | Guo K.,KH Automotive Technologies Changchun Co.
Advanced Materials Research | Year: 2013

Throttling area not only determines flow rate but also influences behavior of a valve. And, the throttling area is a very important factor required to design carefully. However, the throttling area is always difficult to determine because of relatively complex structure, and the pure study for throttling area is published barely although there are also some existing formulas. For getting more suitable models that are not sensitive to the displacement of spool and cone angle, this paper carries out comparison for different principles, and finally finds that projective area based on annular area is the best one for cone valve. During this process, this paper shows a set of mathematic models, simulation and test, which ensures a successful design for a valve mentioned in the paper and brings an universal model for throttling area of cone valve. © (2013) Trans Tech Publications, Switzerland.


Yuan X.-J.,South China University of Technology | Guo K.-H.,South China University of Technology | Guo K.-H.,KH Automotive Technologies Changchun Co.
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2015

This paper deals with the influences of the flow force and the viscous force on the final positions of a pilot valve by means of the CFD method. It describes the high-frequency low-amplitude vibration of the valve in the range of the damper flow and discusses the key factors which cause the pilot valve to keep a steady position and a rapid dynamic response. For the relief valve, the geometrically-nonlinear partial differential equations of the annular plate under the concentrated, partially-distributed and globally-distributed loads are established. Then, it is pointed out that the distribution laws of the concentrated and partially distributed forces can be equivalently described by using the hyperbolic tangent function or the power function. Furthermore, the FEA method is used to analyze the dynamic behavior of the relief valve. Finally, according to relevant mathematic models, CFD results and FEA conclusions, an integrated model is constructed, and the calculated results are compared with the experimental ones. It is found that the theoretical analysisis consistent with the experimental results and that the theoretical methods are feasible. ©, 2015, South China University of Technology. All right reserved.

Loading KH Automotive Technologies Changchun Co. collaborators
Loading KH Automotive Technologies Changchun Co. collaborators