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| 1 | Extension of continuous scanning laser Doppler vibrometry measurement for complex structures with curved surfaces显示文摘The continuous Scanning Laser Doppler Vibrometry(SLDV)developed on the base of the galvanometer scanner system has made it possible to quickly obtain the full field vibration responses within a rectangular area of the structure.In this paper,an arbitrary continuous scanning path generating method for Continuous Scanning Laser Doppler Vibometry(CSLDV)is further put forward in order to allow the CSLDV suitable for testing structures featured by complex shapes not just for regular areas.In the first step,the relationship between position of laser spot and the driving voltages of galvanometer scanner system has been described by a mathematical modeling.Then,a novel arbitrary scanning path generating strategy based on CSLDV is presented by deforming a normalization rectangular scanning path to an arbitrary continuous scanning path.The mapping relation between the normalization rectangular scanning path and arbitrary continuous scanning path is established using the reference points.In the second step,a compressor blade with curved surface was taken as an example for modal test using the proposed method.At the same time,a validated experiment was performed in SLDV.The results show the mode shapes derived from the extended CSLDV are in agreement with those from SLDV and the Modal Assurance Criterion(MAC)between the two are all greater than 0.96.They also demonstrate the feasibility and effectiveness of the proposed method for CSLDV test and show strong potential on further practical engineering applications. | Cuihong LIU Chaoping ZANG Biao ZHOU | 2020 | Chinese Journal of Aeronautics2020，33，12： | 3 |
| 2 | ROBUST DESIGN OF A TWO DEGREE FREEDOM SYSTEM.DUE TO THE PARAMETER UNCERTAINTY显示文摘A method based on the robust design optimization is presented to handle the structural uncertainty problems.The variations caused in dynamic performance can be expressed by the mean response and the standard deviation of the performance.The robust optimization approach,based on a multi-objective and non-deterministic method,attempts to both optimize the mean performance and minimize the variance of the performance simultaneously.The best possible design optimization is chosen by a trade-off decision.An example of robust design of a two degree freedom system is used to effectively illustrate the application in dynamics.The mass and stiffness uncertainty in the main system as well as the uncertainty of the mass,stiffness and damping in the absorber are considered all together in order to minimize the displacement response of the main system within a wide band of excitation frequencies.The robust optimization results show a significant improvement in performance compared with the conventional solution recommended from vibration textbooks.It is indicated that robust design methods have great potential for application in structural dynamics to deal with uncertainty problems. | ZANG Chaoping | 2008 | Chinese Journal of Mechanical Engineering2008，21，6： | 2 |
| 3 | Model validation for structural dynamics in the aero-engine design process显示文摘 | ZANG Chaoping Ewins D J | 2009 | Frontiers of Energy and Power Engineering in China2009，，： | 1 |
| 4 | Structural damage detection using artificial neural networks and measured FRF data reduced via principal component projection显示文摘 | ZANG Chaoping IMREGUN M | 2001 | Journal of Sound and Vibration2001，242，5： | 1 |
| 5 | Structural damage detection and localization using FRF-based model updating approach显示文摘 | ZANG Chaoping IMREGUN M | 2003 | Key Engineering Materials2003，，： | 1 |
| 6 | Model validation of structural dynamics in the aero-engine design process,front显示文摘 | ZANG Chaoping Ewins D J | 2009 | Energy Power Eng China2009，3，4： | 1 |
| 7 | Structural damage detection using independent component analysis显示文摘 | ZANG Chaoping FRISWELL M I IMREGUN M | 2004 | Structural Health Monitoring:An International Journal2004，3，1： | 1 |
| 8 | Structural Damage Detection Method Based on Decomposition of the Operating Deflection Shapes显示文摘Full-field measurement techniques such as the scanning laser Doppler vibrometer (LDV) and the electronic speckle pattern interferometry systems can provide a dense and accurate vibration measurement on structural operating deflection shape (ODS) on a relatively short period of time.The possibility of structural damage detection and localization using the ODS looks likely more attractive than when using traditional measurement techniques which address only a small number of discrete points.This paper discusses the decomposition method of the structural ODSs in the time history using principal component analysis to provide a novel approach to the structural health monitoring and damage detection.The damage indicator is proposed through comparison of structural singular vectors of the ODS variation matrixes between the healthy and damaged stages.A plate piece with a fix-free configuration is used as an example to demonstrate the effectiveness of the damage detection and localization using the proposed method.The simulation results show that:(1) the dominated principal components and the corresponding singular vectors obtained from the decomposition of the structural ODSs maintain most of all vibration information of the plate,especially in the case of harmonic force excitations that the 1st principal component and its vectors mostly dominated in the system;(2) the damage indicator can apparently flag out the damage localization in the case of the different sinusoidal excitation frequencies that may not be close to any of structural natural frequencies.The successful simulation indicates that the proposed method for structural damage detection is novel and robust.It also indicates the potentially practical applications in industries. | ZANG Chaoping | 2011 | Chinese Journal of Mechanical Engineering2011，24，3： | 1 |
| 9 | Model validation for structural dynamics in the aero-engine design process显示文摘 | Chaoping Zang D. J. Ewins | 2009 | Frontiers of Energy and Power Engineering in China2009，，4： | 1 |
| 10 | Identification of crystal orientation for turbine blades with anisotropy materials显示文摘A novel approach to identify the crystal orientation of turbine blades with anisotropy materials is proposed. Based on enhanced mode basis, with the main advantages of its efficiency,accuracy and general applicability, the blade vibration mode of each order is linearly constructed by several specified mode shapes, which are obtained from the considered turbine blade with specified crystal orientations correspondingly. Then, a surrogate model based on Kriging method is introduced for constructing the condensed perturbed matrix of stiffness in order to improve the efficiency even further. The constructed surrogate model allows to perform the modal analysis of turbine blades with arbitrary crystal orientations in higher efficiency, due to the fact that the elements of condensed perturbed matrix of stiffness are considered in construction of the surrogate model rather than concerning the perturbation of all the elements of the initial stiffness matrix for the blade. Genetic algorithm is finally employed to optimize the defined fitness functions in order to identify the crystal orientation angles of turbine blades. Several corresponding examples demonstrated the accuracy, efficiency and general applicability of the proposed method. | Yuanqiu TAN Chaoping ZANG Biao ZHOU Xiaowei WANG E.P.PETROV | 2018 | Chinese Journal of Aeronautics2018，31，2： | 0 |
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