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Articles 1 - 12 of 12
Full-Text Articles in Engineering
Qualitative Modeling For Magnetization Curve, Pei-Hwa Huang, Yu-Shuo Chang
Qualitative Modeling For Magnetization Curve, Pei-Hwa Huang, Yu-Shuo Chang
Journal of Marine Science and Technology
This paper studies the derivation of a qualitative description for the magnetization curve of saturable magnetic materials. From a set of numerical input-output data, a fuzzy model, which is a collection of fuzzy IF-THEN rules for describing the studied system, is first constructed for the magnetization curve. A procedure consisting of a fuzzy clustering method and a rule processing algorithm is then employed for processing the constructed fuzzy modeling rules to extract the qualitative properties of the curve. The proposed approach is objective in that it can yield the system qualitative features without domain experts’ knowledge. An example is demonstrated …
Effect Of Asymmetric Hydrodynamic Impact On The Dynamic Response, Jianbo Hua, Jeun-Len Wu, Wei-Hui Wang
Effect Of Asymmetric Hydrodynamic Impact On The Dynamic Response, Jianbo Hua, Jeun-Len Wu, Wei-Hui Wang
Journal of Marine Science and Technology
Due to the asymmetric water entry over a submerged part of a ship, the effect of the hydrodynamic impact on the dynamic response of a plate structure is investigated numerically by employing an orthogonal plate theory. The effect is found significant in the calculation. Both the deflection and the stress in the plate increase as the asymmetric degree under water entry of a bottom structure increases. Because of the structural dynamic effect, the maximum deflection at a heel angle of 20 degrees becomes about 50% more than that of the quasi-static approach, and the maximum stress in ydirection 40% more …
Coherent Reflection Of Acoustic Plane Wave From Rough Interfaces In A Stratified Random Fluid Medium, Jin-Yuan Liu, Shiahn-Wern Shyue, Chen-Fen Huang
Coherent Reflection Of Acoustic Plane Wave From Rough Interfaces In A Stratified Random Fluid Medium, Jin-Yuan Liu, Shiahn-Wern Shyue, Chen-Fen Huang
Journal of Marine Science and Technology
Coherent reflection of an acoustic plane wave from rough interfaces in a horizontally-stratified medium, within which the sound-speed distribution subject to a small and random perturbation, is considered in this paper. The general formulation based upon the theory for rough-interface scattering in a stratified medium, in conjunction with that for random medium is derived. The Green’s function for a random medium bounded by two surfaces, which serves as generic solution of the problem, is obtained. The formulation is then applied to a simplified seabed environment to study the effects of surface roughness and medium inhomogenieties on the coherent reflection. The …
Thermodynamic Aspect And Diffusion Model On Interdiffusion Of Laminate Structure, Shing-Hoa Wang
Thermodynamic Aspect And Diffusion Model On Interdiffusion Of Laminate Structure, Shing-Hoa Wang
Journal of Marine Science and Technology
A non-uniform system such as microsegregation, heterogeneous microstructure and multiple-layer deposition of thin films, always exists in the engineering materials and the electronic materials for solid state devices. As a consequence of interdiffusion under high temperature exposure, The dynamical changes of composition profiles and vacancies could lead to materials in earlier failure and reduce the life time of the component. Several theoretical fundamentals have been proposed on different aspects, including(1) the void formation at the steepest concentration gradient:(2) thermodynamic view points of excess vacancy flux;(3) the model of interdiffusion for dynamic composition profile change; and(4) stress gradient induced strain enhanced …
Linearly Unbiased Estimation Combined With Jc Method For The Carbonation Contamination Of Some Concrete Bridges In Taipei, Ming-Te Liang, Guo-Fan Zhao, Yen-Sheng Liao, Chih-Hsin Liang
Linearly Unbiased Estimation Combined With Jc Method For The Carbonation Contamination Of Some Concrete Bridges In Taipei, Ming-Te Liang, Guo-Fan Zhao, Yen-Sheng Liao, Chih-Hsin Liang
Journal of Marine Science and Technology
The main purpose of this investigation was to study the durability evaluations of existing concrete bridges due to carbonation contamination. The linearly unbiased estimation method associated with the JC method developed by the Joint Committee on Structural Safety was adopted to predict the mean value and standard deviation of the normal distribution for the carbonation depths and cover thickness of concrete bridges. The reliability index (β) and failure probability (Pf) of concrete bridges were also evaluated. Since the linearly unbiased estimation method is very suitable for analyzing a small number of specimens obtained from practical engineering problems, the unknown parameters …
On The Design And Analysis Of Ship Stabilizimg Fin Controller, Ching-Yaw Tzeng, Chung-Yi Wu
On The Design And Analysis Of Ship Stabilizimg Fin Controller, Ching-Yaw Tzeng, Chung-Yi Wu
Journal of Marine Science and Technology
A ship stabilizing fin controller based on the Internal Model Control (IMC) method is described in this paper. The proposed method directly shapes the output sensitivity function which relates the wave disturbance to the ship roll motion to achieve good disturbance rejection. The adopted IMC method gives a controller that depends explicitly on the model parameters and a design parameter that specifies the desired system response. Moreover, under the IMC structure, the sensitivity functions depend linearly on the design transfer function and this makes it easy to satisfy the internal stability condition. A reference conditioning technique is employed in the …
On The Free Terms Of The Dual Ben For The Two And Three-Dimensional Laplace Problems, Jeng-Tzong Chen, Shyh-Rong Kuo, Wei-Chih Chen, Li-Wei Liu
On The Free Terms Of The Dual Ben For The Two And Three-Dimensional Laplace Problems, Jeng-Tzong Chen, Shyh-Rong Kuo, Wei-Chih Chen, Li-Wei Liu
Journal of Marine Science and Technology
A dual integral formulation for the Laplace problem with a smooth boundary is derived by using the contour approach surrounding the singularity. It is found that using the contour approach the jump terms come half and half from the free terms in the L and M kernel integrations for the two-dimensional case, which is different from the limiting process by approaching an interior point to a boundary point where the jump terms come totally from the L kernel only. The definition of the Hadamard principal value for hypersingular integral at the collocation point of a smooth boundary is extended to …
Effect Of Aggregate Volume Fraction On The Elastic Moduli And Void Ratio Of Cement-Based, Shih-Wei Cho, Chung-Chia Yang, Ran Huang
Effect Of Aggregate Volume Fraction On The Elastic Moduli And Void Ratio Of Cement-Based, Shih-Wei Cho, Chung-Chia Yang, Ran Huang
Journal of Marine Science and Technology
The effects of aggregate volume fraction on the void ratio and the elastic modulus of mortar were studied. Cylindrical specimens with six volume fractions (a/t = 0., 0.05, 0.1, 0.2, 0.3, and 0.4) of fine aggregate and various water/cement ratios (w/c = 0.3, 0.4, and 0.5) were cast and tested. Double inclusion model for three-phase composite (matrix, aggregate, and void) was used to predict the volume of total void based on the properties and quantities of the components and composites. Based on this study, when higher volume fraction of aggregate is used in the mix, the elastic modulus of the …
Machine Vibration Induced Underwater Acoustic Radiation, Wei-Hui Wang, Jia-Horng Liou, Robert Sutton, Ben Dobson
Machine Vibration Induced Underwater Acoustic Radiation, Wei-Hui Wang, Jia-Horng Liou, Robert Sutton, Ben Dobson
Journal of Marine Science and Technology
A coupled FEM/BEM for solving fluid-structure interaction problem in structure-borne noise propagation and underwater acoustic radiation is present in this paper. In order to improve the habitability and stealth low noise condition is required in various types of ships. One of the dominant components is the radiated airborne and underwater noise caused by ship hull vibration. Accordingly, the estimation of structure-borne sound characteristics of a ship is important in the design of a quieter ship-structure. The hull vibration response and pressure distribution on the wetted surface of a ship subjected to excitation sources can be analyzed by utilizing the developed …
Applying Fuzzy Mathematics To Evaluating The Membership Of Existing Reinforced Concrete Bridges In Taipei, Ming-Te Liang, Jai-He Wu, Chih-Hsin Liang
Applying Fuzzy Mathematics To Evaluating The Membership Of Existing Reinforced Concrete Bridges In Taipei, Ming-Te Liang, Jai-He Wu, Chih-Hsin Liang
Journal of Marine Science and Technology
In this study, the concept of fuzzy mathematics was applied to the damage evaluation of existing reinforced concrete (RC) bridges. The partition rule of evaluation grade was used to divide the evaluation results. The damage state of existing RC bridges was carried out using a double layer fuzzy synthesis evaluation. Moreover, based on the results of the synthesis evaluation, the damage state of existing RC bridges was thoroughly partitioned. According to the evaluation results, the double-layer synthesis evaluation of fuzzy for the damage of RC bridge is definitely useful. The evaluation results are also offered as the basis for strategy …
Low-Impact Development:An Innovative Alternative Approach To Stormwater Management, Chao-Hsien Liaw, Mow-Soung Cheng, Yao-Lung Tsai
Low-Impact Development:An Innovative Alternative Approach To Stormwater Management, Chao-Hsien Liaw, Mow-Soung Cheng, Yao-Lung Tsai
Journal of Marine Science and Technology
To assist local governments in their efforts to develop more effective stormwater management programs, an innovative comprehensive approach to stormwater management referred to as Low-Impact Development (LID) has been developed. Low-Impact Development technology employs microscale and distributed management techniques. This paper briefly outlines the development of LID technology and discusses its basic hydrological control principles. However, LID's source control techniques are an economical common sense approach that can be used to better manage new development or retrofit existing development. We believe that this new approach is a significant step forward towards advancing the state-of-the-art of stormwater management and will be …
The Steady Loops Of Sdof Perfectly Elastoplastic Structures Under Sinusoidal Loadings, Chein-Shan Liu
The Steady Loops Of Sdof Perfectly Elastoplastic Structures Under Sinusoidal Loadings, Chein-Shan Liu
Journal of Marine Science and Technology
The model of single degree of freedom perfectly elastoplastic structures under external loading is treated in this paper. It is analyzed and pointed out that for the perfectly elastoplastic structure the equation of motion is nothing but a two-phase linear system with an on-off switch. Then the exact solutions of the dynamic responses are derived for sinusoidal loadings. For such loading we prove that no matter how large the amplitude is, the structure is impossible undergoing a permanent plastic motion; conversely, the long term behavior exhibits either stable hysteresis loop and limit cycle, or elastic shakedown. A phase plane estimation …