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Nonlinear Flutter Characteristic Analysis of the Hypersonic Wings
LUO Qing;LI Dong-xu;NIE Hai-tao;ZHOU Yi;ZHANG Yi-ming
2012, 32 (
3
): 29-33. DOI:
10.3969/j.issn.1006-1355.2012.03.007
Abstract
（
1843
）
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The dynamic equation of a 2-dimentional hypersonic wing was derived by using the modified third order nonlinear piston theory. Both linear and nonlinear flutter boundary conditions were obtained through Hopf-bifurcation theory and directive numerical method respectively. The simulation results show that the effects of nonlinearities can delay or precede the appearance of limit cycles oscillations according to the system parameters.
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Analysis of Mechanical Mobility and Vibration Transfer Property in Powertrain - Vehicle’s Body System
ZHANG Shou-yuan;ZHANG Yi-min
2012, 32 (
1
): 67-71. DOI:
10.3969/j.issn.1006-1355-2012.01.016
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（
1590
）
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A simplified multiple DOFs lumped-parameter elements model is established to study the dynamic properties of vibration path in powertrain-vehicle’s system in high frequency range. The relationships among isolator, interface velocity and each component’s mobility are derived. The main parameters influencing the dynamic properties of the vibration paths are determined by component’s parameter study. Finally, effective methods are proposed to perform dynamic design of the powertrain-body vibration transfer system.
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Study on the Design Method of Subsystems for NVH Structure-borne Noise
ZHANG Shou-yuan;ZHANG Yi-min
2011, 31 (
6
): 131-134. DOI:
10.3969/j.issn.1006-1355-2011.06.029
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（
1675
）
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A method for vehicle interior structure noise design in the middle frequency range in early stage of development is proposed in this paper. The dominant cause of structure noise for main transfer path is determined according to the simulation result of the “Digital Mule” vehicle model and the reference vehicle model, and then NVH performance targets for corresponding subsystems are established. The overall target is finally reached by achieving subsystem targets. An example for powertrain induced noise confirms the efficiency of the proposed method.
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《Noise Forecast of Aircleaners with Random Transfer Function》
YUE Gui-ping;ZHANG Yi-min
2010, 30 (
2
): 163-166. DOI:
10.3969/j.issn.1006-1355.2010.02.163
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2091
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The method of noise analysis of aircleaners with random transfer function is presented using matrix perturbation theory, matrix calculus, Kronecker algebra and generalized second moment method. Considering the uncertainty factors of the atmosphere, the random response of the aircleaner is described clearly in the time and space domain, and the decibel (A) value of the former second moment of random response at the sound outlet of the aircleaner is obtained.
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