Composites have been found to be the most promising and discerning material available in this century. Presently, composites reinforced with fibers of synthetic or natural materials are gaining more importance as demands for lightweight materials with high strength for specific applications are growing in the market. Fiber-reinforced polymer composite offers not only high strength to weight ratio, but also reveals exceptional properties such as high durability; stiffness; damping property; flexural strength; and resistance to corrosion, wear, impact, and fire. These wide ranges of diverse features have led composite materials to find applications in mechanical, construction, aerospace, automobile, biomedical, marine, and many other manufacturing industries. Performance of composite materials predominantly depends on their constituent elements and manufacturing techniques, therefore, functional properties of various fibers available worldwide, their classifications, and the manufacturing techniques used to fabricate the composite materials need to be studied in order to figure out the optimized characteristic of the material for the desired application. An overview of a diverse range of fibers, their properties, functionality, classification, and various fiber composite manufacturing techniques is presented to discover the optimized fiber-reinforced composite material for significant applications. Their exceptional performance in the numerous fields of applications have made fiber-reinforced composite materials a promising alternative over solitary metals or alloys.

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Fiber-Reinforced Polymer Composites: Manufacturing, Properties, and Applications.

Emerged in the middle of 20th century, composite materials are now one of the hotspot research topics in the modern technology. Their promising characteristics make them suitable for enormous applications in industrial field such as aerospace, automotive, construction, sports, bio-medical and many others. These materials reveal remarkable structural and mechanical properties such as high strength to weight ratio, resistance to chemicals, fire, corrosion and wear; being economical to manufacture. Herein, an overview of composite materials, their characterization, classification and main advantages linked to physical and mechanical properties based on the recent studies are presented. There, were presented the conventional manufacturing techniques of composite and their applications. It was highlighted the tremendous need to discovery new generation of composites that should incorporate the synthetic or natural materials by implementing new efficient manufacturing processes. In the combination of matrix and reinforcement materials, the use of natural materials as constituent are compulsory in order to obtain a complete material degradable as environmentally friendly.

Recent progress of reinforcement materials: a comprehensive overview of composite materials

Abstract : A series of constant-deadrise models, varying in length, was tested in smooth water and regular waves to define the effects of deadrise, trim, loading, speed, length-beam ratio, and wave proportions on the added resistance, on heave and pitch motions, and on impact accelerations at the bow and center of gravity. Each of these parameters was varied independently of the others so as to obtain a proper evaluation of the effects of changing a single quantity. The results, presented in the form of response characteristics, cover a wide range of operating conditions; and show, quantitatively, the importance of design parameters on the rough-water performance of planing hulls.

A systematic study of the rough water performance of planing boats. Part II: Irregular waves

Hull hydrodynamic optimization of autonomous underwater vehicles operating at snorkeling depth

Inertial sensor arrays present the possibility of improved and extended sensing capabilities as compared to customary inertial sensor setups. Inertial sensor arrays have been studied since the 1960s and have recently received a renewed interest, mainly thanks to the ubiquitous micro-electromechanical (MEMS) inertial sensors. However, the number of variants and features of inertial sensor arrays and their disparate applications makes the literature spread out. Therefore, in this paper we provide a brief summary and literature review on the topic of inertial sensor arrays. Publications are categorized and presented in a structured way; references to +300 publications are provide. Finally, an outlook on the main research challenges and opportunities related to inertial sensor arrays is given.

Inertial sensor arrays — A literature review

Non-linear buckling analysis of imperfect thin spherical pressure hull for manned submersible

Parametric studies on seaworthiness of SWATH ships

Tunnels or ‘propeller pockets’ are often a necessity in planing crafts, in order to accommodate propellers and minimize the shaft angle. Computational Fluid Dynamics (CFD) is increasingly being used as a design tool for the purpose of modelling ship flows. This is due to advances in computational methods together with improvement in performance and affordability of computers. Qualitative information to decide the relative merits of aspects, such as flow alteration in and around the ship hull, can be usefully deduced from careful CFD based analysis. In this paper, work has been undertaken to assess the pressures and resistance characteristics of a single chine high speed planing hull. A relatively full sized tunnel has been introduced in the numerical model. Using k − e turbulence model in FLUENT, combining the predicted trim angle from equilibrium considerations and an iterative process, the stable equilibrium flow conditions have been modelled. The dynamic pressures have been evaluated and by integration, they have been matched with the total weight of the vessel. Single phase flow has been used to obtain the dynamic pressures in the underwater hull region. The numerical model predicts more favourable trim and qualitatively reduced resistance. Experiments conducted in a towing tank, using a model with and without the tunnel, confirm that by providing the tunnel there is improvement in the resistance by appreciable reduction. Pressure measurements confirm the validity of the numerical predictions obtained from CFD. It is quantitatively established that tunnels may be designed with beneficial effects for resistance.

Pressure and drag influences due to tunnels in high-speed planing craft

Genetic Algorithm Based Design Optimization of a Passive Anti-Roll Tank in a Sea Going Vessel

Viscous flow around the self-propelled hull was investigated at model scale with a RANSE solver using k-ϵ turbulence model by coupling the flow around the hull model with the flow generated by the rotating propeller. Hence, the challenges involved in the coupling of flow past ship hull with propeller flow of lower-order scale have been brought out and addressed here. Propeller rotation is accounted for by mesh motion; the solution domain is represented by a rotating cylindrical domain encompassing the propeller and a fixed rectangular domain around the hull for the remaining part of the solution domain; both these domains are interfaced by sliding interfaces. Comparisons are made between the simulated results and corresponding experimental results for hull resistance, propeller thrust and propeller RPM. It is shown that the flow field in the self-propelling condition is well reproduced in the simulation, and the estimated thrust deduction factor and RPM agree well with the measured ones. Among the various...

V. Anantha Subramanian

Papers

Non-linear buckling analysis of imperfect thin spherical pressure hull for manned submersible

Parametric studies on seaworthiness of SWATH ships

Pressure and drag influences due to tunnels in high-speed planing craft

Genetic Algorithm Based Design Optimization of a Passive Anti-Roll Tank in a Sea Going Vessel

Estimation of hull-propeller interaction of a self-propelling model hull using a RANSE solver