Optimum Structural Design of High-Speed Surface Effect Ships Built of Composite Materials

2003 ◽  
Vol 40 (01) ◽  
pp. 42-48
Author(s):  
Chang Doo Jang ◽  
Ho Kyung Kim ◽  
Ha Cheol Song
Keyword(s):  
Composite Materials ◽  
Computer Program ◽  
Structural Design ◽  
High Speed ◽  
Surface Effect ◽  
Minimum Weight ◽  
Original Design ◽  
Optimum Structural Design ◽  
Surface Effect Ship ◽  
Speed Performance

A surface effect ship is known to be comparable to a high-speed ship. For the structural design of surface effect ships, advanced design methods are needed which can reflect the various loading conditions different from those of conventional ships. Also, minimum weight design is essential because hull weight significantly affects the lift, thrust powering and high-speed performance. This paper presents the procedure of optimum structural design and a computer program to minimize the hull weight of surface effect ships built of composite materials. By using the developed computer program, the optimum structural designs for three types of surface effect ships—built of sandwich plate only, stiffened single skin plate only, and both plates—are carried out and the efficiency of each type is investigated in terms of weight. The computer program, developed herein, successfully reduced the hull weight of surface effect ships by 15–30% compared with the original design. Numerical results of optimum structural designs are presented and discussed.

An Analysis of Heave Added Mass and Damping of a Surface-Effect Ship

1981 ◽  
Vol 25 (01) ◽  
pp. 44-61
Author(s):  
C. H. Kim ◽  
S. Tsakonas
Keyword(s):  
Free Surface ◽  
High Speed ◽  
Surface Effect ◽  
Practical Method ◽  
Added Mass ◽  
Damping Coefficients ◽  
Calm Water ◽  
Surface Effect Ship ◽  
Long Time ◽  
Computational Procedures

The analysis presents a practical method for evaluating the added-mass and damping coefficients of a heaving surface-effect ship in uniform translation. The theoretical added-mass and damping coefficients and the heave response show fair agreement with the corresponding experimental values. Comparisons of the coupled aero-hydrodynamic and uncoupled analytical results with the experimental data prove that the uncoupled theory, dominant for a long time, that neglects the free-surface effects is an oversimplified procedure. The analysis also provides means of estimating the wave elevation of the free surface, the escape area at the stern and the volume which are induced by a heaving surface-effect ship in uniform translation in otherwise calm water. Computational procedures have been programmed in the FORTRAN IV language and adapted to the PDP-10 high-speed digital computer.

Multihull and Surface-Effect Ship Configuration Design: A Framework for Powering Minimization

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Ronald W. Yeung ◽  
Hui Wan
Keyword(s):  
High Speed ◽  
Surface Effect ◽  
Early Stage ◽  
Base Line ◽  
Total Displacement ◽  
Surface Effect Ship ◽  
Linearized Theory ◽  
Air Cushion ◽  
New Formula ◽  
Analytical Expressions

The powering issue of a high-speed marine vehicle with multihulls and air-cushion support is addressed, since there is an often need to quickly evaluate the effects of several configuration parameters in the early stage of the design. For component hulls with given geometry, the parameters considered include the relative locations of individual hulls and the relative volumetric ratios. Within the realm of linearized theory, an interference-resistance expression for hull-to-hull interaction is first reviewed, and then a new formula for hull-and-pressure distribution interference is derived. Each of these analytical expressions is expressed in terms of the Fourier signatures or Kochin functions of the interacting component hulls, with the separation, stagger, and speed as explicit parameters. Based on this framework, an example is given for assessing the powering performance of a catamaran (dihull) as opposed to a tetrahull system. Also examined is the wave resistance of a surface-effect ship of varying cushion support in comparison with that of a base line catamaran, subject to the constraint of constant total displacement.

A Coupled SPH-FEM Solver for Modeling Surface Effect Ship (SES) Bow Seal Dynamics

2020 ◽  
Author(s):  
John Gilbert ◽  
Leigh McCue
Keyword(s):  
High Speed ◽  
Surface Effect ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Numerical Predictions ◽  
Surface Effect Ship ◽  
Particle Hydrodynamics ◽  
Hyper Elastic ◽  
Smoothed Particle ◽  
The University

Abstract The life of Surface Effect Ship (SES) bow and finger seals are often short-lived due to a combination of environmental effects and dynamic loading due to high-speed operation. Improving SES seal robustness requires a deeper understanding of the dynamics and loads seen by SES skirt seals during operation. In this work, we present the results of a validation study performed for a coupled, smoothed particle hydrodynamics (SPH) - finite element method (FEM) solver developed to study fluid-structure impact and free-surface flow interaction with hyper-elastic structures. This work continues and extends the earlier coupled SPH-FEM approach of Yang et al. [1]. Numerical predictions for skirt seal displacement are compared against the experimental observations of Zalek and Doctors performed by the Marine Hydrodynamics Laboratory at the University of Michigan [2].

A study on the optimum structural design of surface effect ships

1996 ◽  
Vol 9 (5) ◽  
pp. 519-544 ◽  
Author(s):  
Chang Doo Jang ◽  
Seung Il Seo ◽  
Sang Keun Kim
Keyword(s):  
Structural Design ◽  
Surface Effect ◽  
Optimum Structural Design

Instrumentation of a high-speed surface effect ship for structural response characterization during sea trials

2000 ◽  
Author(s):  
Karianne Pran ◽  
Gregg Johnson ◽  
Alf E. Jensen ◽  
Knut A. Hegstad ◽  
Geir Sagvolden ◽  
...  
Keyword(s):  
High Speed ◽  
Surface Effect ◽  
Structural Response ◽  
Surface Effect Ship

Selection of Propulsion Systems for High-Speed Advanced Marine Vehicles

1975 ◽  
Vol 12 (01) ◽  
pp. 33-49
Author(s):  
Roderick A. Barr ◽  
Robert J. Etter
Keyword(s):  
High Speed ◽  
Surface Effect ◽  
Selection Process ◽  
Propulsion System ◽  
Propulsion Systems ◽  
Propulsive Efficiency ◽  
Marine Vehicles ◽  
Surface Effect Ship ◽  
System Selection ◽  
Ship Performance

Methods and criteria for evaluating and selecting propulsion systems for high-speed marine vehicles such as surface effect ships, hovercraft, hydrofoils, and planing craft are summarized. The problem of matching ship performance (drag, thrust, endurance, etc.) and geometric requirements to propulsion system characteristics to select the best propulsion system for a given application is discussed in some detail. Water-jet, marine propeller and air propulsion systems, including propulsor, propulsor mounting appendages, transmission and engines, are considered. An example utilizing a 4000-ton surface effect ship illustrates that the numerous tradeoffs involved in the selection process may lead to a propulsion system selection based on parameters other than propulsive efficiency. A second example for a 750-ton hydrofoil craft is referenced.

Propellers for High-Performance Craft

1978 ◽  
Vol 15 (04) ◽  
pp. 335-380 ◽  
Author(s):  
John L. Allison
Keyword(s):  
High Speed ◽  
High Performance ◽  
Surface Effect ◽  
Historical Review ◽  
Full Scale ◽  
Design Procedures ◽  
Surface Effect Ship ◽  
Design Selection ◽  
Improved Performance ◽  
Model Versus

This paper presents a brief historical review of marine propeller development leading to modern design, selection, and matching methods for high-performance craft such as planing hulls, hydrofoils and surface effect ships. Subcavitating propeller theory is summarized, and some limitations are discussed with regard to high-speed applications. An outline of supercavitating propeller theory is provided together with brief details of design procedures and the limitations of available data. The special problems of application of supercavitating propellers to surface effect ships are discussed briefly. Topics include sidehull installations, matching for hump and cruise, need for partial submergence and controllable pitch, strength considerations, and model versus full-scale performance. A review of recent progress in the application of supercavitating propellers to surface effect ships is presented, including comparisons of predicted full-scale blade pressures and stresses with actual full-scale measurements of speeds up to 80 knots. Future trends and goals are discussed, including development of improved performance prediction methods, rational structural design procedures, and new types of installation configuration. Much of the new information contained in this paper arises out of work performed under contract for the U. S. Navy Surface Effect Ship Program Office (PMS304) by Bell Aerospace Textron.

Sign in / Sign up

Export Citation Format

Share Document