For reducing the vibration problem in ship design or reducing the vibration and noise for the ships which have already serviced in military, this paper based on my army's patrol craft AutoCAD drawings and the vibration experiment, making use of the VBA of AutoCAD development tool to read the drawings, then become the American large structure analysis software ANSYS acceptable structure parameter database, to carry out the intelligentized data input of ship vibration prediction software.
The natural frequency and the real ship’s vibration level are obtained by experiments, which provide detectable examples for the software of vibration forecast about similar ships worked out by the authors.
Through the comparison of experiment data and the calculation result, verified the accuracy of the virtual instrument established in this paper. At the same time, the software can provide suitable parameters which needed in ship design and make a more perfect ship vibration optimization and control system.
At last , the several problems in forecasting the mast structure by the method of finite element that should be studied further have been discussed also.
Then the methods of blast-vibration prediction and commonly accepted criteria to prevent damage were introduced.
The design approach combines a finite element method vibration prediction code, a boundary element method sound power prediction code and a combined stochastic/gradient-based optimization algorithm.
Another technique used for vibration prediction is the use of a regression analysis.
Currently, these systems are often modeled by simpli Advanced application of FLAC analyses in traffic vibration prediction W.
High frequency vibration prediction is a challenging task in structural analysis and optimization.
Such problems arise in connection with prediction of vibration levels produced on the ground surface by underground and surface sources (transportation, construction machinery, etc.).
A more extensive analysis was performed with respect to the prediction of vibration periods.
A tractor-operator model was adapted for prediction of vibration accelerations on the ISO 5008 track.
The second technique uses the standard FEM for prediction of vibration response.
The method of ship vibration forecasting introduced is an intelligent system which isworked out in computer super-language. It not only can manage the ship vibration datascientifically but also can forecast ship vibration dynamically by satistical method.
The hull vibration of large tanker is studied on the basis of introducing double beam model and a tri beam model is then proposed. By using both the multi beam model and single beam model, the vibration calculations of a ship are performed. The results with the multi beam models show some more favorable features than those with single beam model. Based on these studies, it is considered that the tri beam model will be more suitable for hull vibration analysis, especially in higher mode situation.
The paper derives a fluid structure interaction equation of motion for aft part vibration of ships by use of 3 dimensional hydroelasticity theory. Based on 3 dimensional structure finite element method and 3 dimensional fluid boundary element mehtod, the authors establish a discretized model for hydroelastic analysis of aft part vibration of ships, give a prediction method for aft part vibration of medium size surface vessels, develop a set of computational programs on the micro IBM computer, calculate...
The paper derives a fluid structure interaction equation of motion for aft part vibration of ships by use of 3 dimensional hydroelasticity theory. Based on 3 dimensional structure finite element method and 3 dimensional fluid boundary element mehtod, the authors establish a discretized model for hydroelastic analysis of aft part vibration of ships, give a prediction method for aft part vibration of medium size surface vessels, develop a set of computational programs on the micro IBM computer, calculate aft part vibration of two kinds of naval ships. The numerical results are in fairly good agreement with the experimental measure ments. The work presented in this thesis has provided a tool for the design of noise and vibration reduction of the medium size sarface vessels and improvement of the environment of stern.
振动预报
vibration prediction
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