Yao L.,China Automotive Engineering Research Institute |
Zhang G.,Pan Asia Technical Automotive Center Co.
Lecture Notes in Electrical Engineering | Year: 2013
Research and/or Engineering Questions/Objective The inertia excitation and the unbalanced force is one of main excitation sources, which induce the vehicle interior structure-borne noise. The research on the optimization of the PT mounting system is very common, but the research on how to modify the vehicle panel to reduce the structure-borne noise induced by engine is very few. The paper utilizes CAE technology and transfer path analysis for identifying the main transfer path, and the control of the vehicle interior structure-borne noise excited by engine excitation is well implemented. Methodology A new TPA method based on the CAE technology is proposed to analyze the vehicle interior structure-borne noise in present work. This method can implement the control of the vehicle interior structure-borne noise excited by engine excitation through the control of the transfer function of subsystem on the main transfer path. In present method, the finite element method is used to establish the dynamics model of vehicle PT-Body coupled system is establish, and the prediction of vehicle interior structure-borne noise is investigated, then the main transfer path is identified by using TPA method on the basis of subsystem response. Finally, the Panel contribution Analysis (PCA) techniques can be implemented on the structure- acoustic transfer function of body-subsystem in the uppermost transfer path, and the dominant panel contributions can be identified. Results This paper considers a problem of micro-car interior structure-borne noise generated by engine excitation. The micro-car is simply treated with a coupled system composed with two subsystems, namely body-subsystem and PT-subsystem. In the light of above method, the prediction on vehicle interior structure-borne noise induced by the engine second excitation is obtained. As the main transfer path then is found out. The PCA technology is utilized to analyze the special structural acoustic transfer function. The result shows the main panels are the dash panel and the roof, respectively. The topography technology is applied to optimize the main panel to improve the performance. The result shows the proposed method reduce the vehicle interior structure-borne noise effectively. Limitations of this study The vehicle interior structure-borne noise induced by the chassis subsystem is not studied and the chassis transfer path analysis is also not carried out in present work. This paper has not studied the influence due to the error of CAE model. There are some others TPA methods such as Fast TPA, multilevel TPA, presently. These ideas in other TPA methods should be used for reference in present method. What does the paper offer that is new in the field in comparison to other works of the author A new TPA method based on the CAE technology is proposed to analyze the vehicle interior structure-borne noise induced by engine excitation in present work. The CAE technology will be introduced to improve the range and effect of TPA. This paper introduces the PCA techniques into TPA method, and synergies the strengths of PCA and TPA methods. The proposed method improves the optimization efficiency compared with classical CAE technology. Compared to the classical TPA, the present method provides the NVH design directions at detailed engineering phase even at the concept phase. Conclusion The new TPA method synergies the strengths of CAE and TPA methods, is feasible to analyze the interior structure-borne noise induced by engine excitation. The PCA technology is well applied into the optimization of vehicle interior structure-borne noise. The present method is applicable and can provide broad guidance for interior noise control in the design process. © 2013 Springer-Verlag.
Gui Z.X.,Huazhong University of Science and Technology |
Zhang Y.S.,Huazhong University of Science and Technology |
Li H.Q.,Huazhong University of Science and Technology |
Ma M.T.,China Automotive Engineering Research Institute
Advanced Materials Research | Year: 2013
Full-scaled hot stamping dies were designed for a vehicle bumper, based on evaluation of cooling system by FE simulation and the temperature variation assessment by analytical model. The blank shape was gained using inverse algorithm and well-designed according to production practice. Experiments were conducted to verify the reliability of both the die and blank design, as well as tests for microstructure and mechanical properties of the hot-stamped part. Results show that, CAE analysis provides a robust support for hot stamping die and blank design; Position stability of hot blank is greatly improved during robotic transport process after shape designing; Metallographic analysis demonstrates the hot-stamped bumper obtained a fully martensitic microstructure, its tensile strength is about 1550 MPa, microhardness is 47.5 HRC, and the elongation is up to 6%. © (2013) Trans Tech Publications, Switzerland.
Fan S.,China University of Mining and Technology |
Li B.,China University of Mining and Technology |
Chen J.,China Automotive Engineering Research Institute
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2011
Aiming at analysising the influence of interference fit and frictional coefficient of fretting on the contact surface comprised by outer plate and pin on fretting wear, the distribution of elastic stresses on the contact surface was analyzed using a finite element solver Ansys, the contact status(sticking, sliding and opening) and the distribution of elastic stresses on the contact line which microcracks prefer to occur on the contact surface were computed based on different interference fit and frictional coefficient. The results show that the tensile stress and shear stress all obtain the extremum value on the contact line and microcracks prefer to occur in the interface point between sticking zone and sliding zone, the changing of interference fit and frictional coefficient of the contact surface can adjust the location of the interface point and the location of nucleating microcracks.
Resection or degeneration of uncovertebral joints altered the segmental kinematics and load-sharing pattern of subaxial cervical spine: A biomechanical investigation using a C2-T1 finite element model
Wang Z.,Chongqing Medical University |
Zhao H.,Chongqing Medical University |
Liu J.-M.,China Automotive Engineering Research Institute |
Tan L.-W.,Chongqing Medical University |
And 2 more authors.
Journal of Biomechanics | Year: 2016
The uncovertebral joint (UJ) is an important load-bearing structure in the subaxial cervical spine (SCS) and the medial wall of the intervertebral foramen (IVF). To investigate the UJ's role in load distribution and transmission under physiological loading, we developed and validated a detailed finite element model (C2-T1). Based on the initial model, two additional models were modified to simulate surgical resection and degeneration of UJs, to evaluate their influence on SCS kinematics and load distribution. The three models were subjected to 2. N. m pure moment (flexion, extension, lateral bending, and axial rotation). Foraminal narrowing and potential nerve compression were evaluated. In the initial model, contact forces provided by the UJ were apparent in lateral bending and axial rotation. In axial rotation, the UJs and contralateral facet joints participated in joint activity, implying a possible restraint/counterbalance mechanism of these two joints. Peak vertebral stress was observed in the pedicle of vertebrae and was higher in the uncovertebral region than in the facet region. Resection of uncinate processes led to an apparent range of motion increase in lateral bending and axial rotation, while sagittal kinematics is influenced slightly. The load on other structures was slightly increased, but in axial rotation, resection of UJs changed the load distribution pattern. Degeneration of UJs significantly increased SCS stiffness and shielded other load-bearing structures. Peak IVF narrowing, but no nerve compression, was observed in axial rotation of the resection model. Thus, resection did not induce apparent secondary foraminal stenosis when other structures were still functional. © 2016 Elsevier Ltd.
Duan H.-M.,Tongji University |
Xie F.,China Automotive Engineering Research Institute |
Zhang K.-B.,China Automotive Engineering Research Institute |
Ma Y.,China Automotive Engineering Research Institute |
Shi F.,China Automotive Engineering Research Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011
The components of road surface measurement system and measurement methods of road surface profile in automotive tests were reviewed. Based on the massive road surface measurement data, some signal pre-processing methods were proposed, including the identification and correction of abnormal errors, the extraction of signal trends, the smooth connection of segmental data, the randomness test of measurement data and the data processing at the moment of speed anomaly. After the introduction of principles and algorithms of these methods, several actually measured road data were taken as examples, and show that the results of calculation and processing are significant, and the methods are simple and of obvious effect. They can be widely applied to road surface data processing as well as to other engineering vibration signals processing.