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Zhang W.,Naval Arming Academy | Zhang W.,Chinese Naval Aeronautical Engineering Academy
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

Heavyweight shipboard equipments must be tested on a floating shock platform(FSP), however, the shock test is time-consuming, laborious and expensive. The finite element modeling and simulation can provide a viable and cost effective alternative to shock tests. The objective of the paper is to examine the response of shipboard equipment on a floating shock platform(FSP) using nonlinear ABAQUS finite element software. The results can provide a reference for the evaluation of shipboard equipment's shock resistivity and the design of large FSP.


Zhang W.,Naval Arming Academy | Zhang W.,Chinese Naval Aeronautical Engineering Academy | Shi S.-H.,Naval Arming Academy
Baozha Yu Chongji/Explosion and Shock Waves | Year: 2011

Standing, sitting, walking human lumped parameter models were developed to explore the crew response under underwater explosion. The relation between the human impact damage and underwater explosion shock strength was analyzed. And the damage undergone by the crew was evaluated based on the common standards to provide guidance for the crew protection of surface ships.


Du X.,CAS Beijing Institute of Acoustics | Du J.,Naval Arming Academy | Wang Y.,Naval Arming Academy
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2011

In this paper, ship pipeline vibration reduction optimization was studied. An optimization process and analysis method based on ANSYS was studied. Based on the single beam model, the response of the shockwave of the pipes was simulated with various boundary conditions, different numbers of pipe clamps, and several directions of the constraint. A reduced beam model was established based on the reduced model of the starboard diesel generator's vent-pipes. An analysis and optimization method was provided for complex pipes. Considering different numbers of the pipe clamps, the model's response to a shock wave was analyzed in the case of shock load, sine load, and a fixed constraint. The position of the pipe clamps was optimized for the minimum displacement when the shock response was obviously improved. The best position of the pipe clamps was obtained from thorough analysis. The response and displacement were improved due to the same shockwave.


Cao J.,Wuhan Naval University of Engineering | Cao J.,Naval Arming Academy | Wei Z.,Wuhan Naval University of Engineering | Liu S.,Wuhan Naval University of Engineering
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2013

A new method of modal parameter identification based on second-order blind source separation improved by quantum genetic algorithm is proposed. Firstly, Hilbert transformation of the measured data is used to build data analysis matrix. After the optimal delay from quantum genetic algorithm, joint approximate diagonalization of the optimal delay second-order covariance matrix is used to separate the mixed signals. Then modal shapes are extracted from the mixed matrix. Finally, frequency and damping ratios could be obtained from the modal responses using each single degree of freedom mode. Experimental results of steel structure prove that the proposed method is applicable in complex modal case. Furthermore, the method possesses the advantages of simplified calculation and high identification accuracy.


Wang H.-W.,Wuhan Naval University of Engineering | Wang Y.,Naval Arming Academy | Zhao J.-H.,Wuhan Naval University of Engineering | Zhao J.-H.,Naval Arming Academy
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

The basic theory of the extended Fourier amplitude sensitivity test method was introduced and the parametric model of a piping system on the main engine of a ship was built by using ANSYS-APDL software. The procedure for applying the extended Fourier amplitude sensitivity test method to computing the sensitivities of the model was programmed by use of MATLAB software. The sensitivity analysis indicated that the key factors influencing the shock response of the piping system are the thickness of the pipe, the rigidity of the elastic hanger, the lumped mass and its position, and the position of the elastic support; the method and the conclusions obtained can be used in the optimal shock-resistant design of a piping system.


Wang Y.,Naval Arming Academy | Ji C.,Naval Arming Academy | Ji C.,Wuhan Naval University of Engineering | Du J.-Y.,Naval Arming Academy | Zhu C.-S.,Zhejiang University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

The types of shock impulse of ship shafting systems were introduced. Shock dynamic model of a ship shafting system was built with finite element method, and a software (SHAFTFE) for ship shafting system dynamics and shock response simulation was developed with MATLAB. Dynamic characteristics of a ship power shafting system including propulsion shafting, propulsion electric motor and its vibration isolator were analyzed using SHAFTFE with different shock forces and parameters, and effects of the structural design parameters of the ship shafting system on the shock response were analyzed. The results showed that the ship power shafting system has a larger displacement under the action of the base shock, so more attention must be paid to the shock character of ship power shafting systems during design in order to increase reliability and survival performance of a whole ship.


Ji C.,Naval Arming Academy | Ji C.,Wuhan Naval University of Engineering | Wang Y.,Naval Arming Academy | Yang L.,Naval Arming Academy | Feng L.-H.,Naval Arming Academy
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2011

Considering the shock-resistance threshold of equipment on board as the important base for ship shock-resistance design and assessment, a finite element model of marine gearbox was established to get the characteristic of shock-resistance threshold. The shock-resistance threshold was analyzed using endurable stress method. Results indicate that endurable stress method is a direct and effective computational method for getting shock-resistance threshold of marine equipment. The shock-resistance threshold of marine gearbox is related to the peak value of acceleration and pulse width of input load.


Ji C.,Naval Arming Academy | Ji C.,Wuhan Naval University of Engineering | Wang Y.,Naval Arming Academy | Yang L.,Naval Arming Academy | Feng L.-H.,Naval Arming Academy
Binggong Xuebao/Acta Armamentarii | Year: 2011

Considered many non-linear contact relationships between the main components in diesel, a time domain simulation method was applied to assessment its shock response. In the assessment, some modeling principles of complex mechanical systems, such as diesel, were given. Also, the finite element models of main components in V6 diesel were established, and then, their shock response characteristics were analyzed in time-domain on the basis of BV043/85 criterion. The stress responses of main components showed the shock vulnerability spots, and the motion response and results of oil film on bearing indicated the work ability. Theanalysis results show that the assessed diesel meet BV043/85 standard on impact security level of A-grade equipments.


Ji C.,Naval Arming Academy | Ji C.,Wuhan Naval University of Engineering | Wang Y.,Naval Arming Academy | Zhao J.-H.,Wuhan Naval University of Engineering | Du J.-Y.,Naval Arming Academy
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

The frequency domain analysis of marine equipment anti-shock capacity is a common engineering evaluation method. A finite element model of a diesel was established, and modified using the modal tests of its main components. According to GJB1060.1-91, the shock load of the computation model was cletermined based on the DDAM method. Then, its shock response was analyzed under each shock load. The results indicated that the frequency domain analysis of marine equipment anti-shock capacity is an effective evaluation method, and this diesel model meets the requirement of the GJB.


Zhang W.,Naval Arming Academy | Wang Y.,Naval Arming Academy | Du J.-Y.,Naval Arming Academy
Binggong Xuebao/Acta Armamentarii | Year: 2010

From the viewpoint of engineering application, a distortion model was established for the ship grillage to illustrate that its thickness can not be scaled down with the same ratio as the width or length. Based on to the finite element coefficient prediction method, the distortion coefficients of the model were predicted by using numerical experiments. The dynamic response of the structure in nature scale can be predicted from the distortion model.

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