Duration: Oct 20 2020 → Oct 20 2020
T1 - Hydrodynamic and structural investigations of catamaran design
AU - Julianto, Rizki Ispramudita
AU - Muttaqie, Teguh
AU - Adiputra, Ristiyanto
AU - Hadi, Syamsul
AU - Hidajata, Raymundus Lullus Lambang Govinda
AU - Prabowo, Aditya Rio
N1 - Publisher Copyright: © 2020 The Authors.
N2 - The type of hull in the catamaran is developed by following the design criteria. A catamaran has advantages over a monohull in terms of broad layout, excellent stability, and obstacles on small vessels. The catamaran design follows the semi SWATH type design by having two hulls with a small hull front corner and modeling on INCAT wave-piercing catamaran to determine the structural response to the ship, and the wave slamming process. In the simulation analysis using fluid-structure interaction with RANS and also the strength of the catamaran structure using the FE method and large base scale. In modeling also to show the hydroelastic response to the ship structure that makes the dynamic interaction between waves and ship structure more practical. Then, the design optimization of the catamaran is directed to the addition of keel fins and the application of titanium materials.
AB - The type of hull in the catamaran is developed by following the design criteria. A catamaran has advantages over a monohull in terms of broad layout, excellent stability, and obstacles on small vessels. The catamaran design follows the semi SWATH type design by having two hulls with a small hull front corner and modeling on INCAT wave-piercing catamaran to determine the structural response to the ship, and the wave slamming process. In the simulation analysis using fluid-structure interaction with RANS and also the strength of the catamaran structure using the FE method and large base scale. In modeling also to show the hydroelastic response to the ship structure that makes the dynamic interaction between waves and ship structure more practical. Then, the design optimization of the catamaran is directed to the addition of keel fins and the application of titanium materials.
UR - http://www.scopus.com/inward/record.url?scp=85092780224&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85092780224&partnerID=8YFLogxK
U2 - 10.1016/j.prostr.2020.07.013
DO - 10.1016/j.prostr.2020.07.013
M3 - Conference article
AN - SCOPUS:85092780224
SN - 2452-3216
JO - Procedia Structural Integrity
JF - Procedia Structural Integrity
T2 - 6th International Conference on Industrial, Mechanical, Electrical and Chemical Engineering, ICIMECE 2020
Y2 - 20 October 2020 through 20 October 2020
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Targeted design strategies for highly activated carbon cloth cathode/anode to construct flexible and cuttable sodium ion capacitors with all-woven-structure.
Carbon cloth (CC) is a promising flexible substrate to construct flexible electrodes. However, commercial CC suffers from high price, large dead weight/volume and poor electrochemical activity, severely affecting the energy/power density of energy storage devices. Herein, both porous CC (PCC) cathode and hard carbon CC (HCC) anode are rationally designed and prepared by targeted strategies using scalable and renewable cotton cloth. Where full microporous structure of PCC ensures complete self-supporting structure, large specific surface area and high performance based on PF6-. Non-porous structure with localized graphitic nanodomain of HCC contributes efficient sodium storage comparable to capacitor with better flexibility. Consequently, both PCC cathode and HCC anode realize high reversible capacity, outstanding rate capability, and ultralong cycling life in the half/full cell of sodium ion capacitor system. More significantly, a flexible all-cloth sodium ion capacitor is assembled by using PCC cathode, HCC anode and cotton cloth separator, which provides stable power output even under bending and cutting conditions owing to its all-woven-structure. In addition, the structural design strategy, structure-activity relationship, and charge/discharge mechanism of CC electrodes are also studied in detail, which provides a constructive view for developing low-cost CC-based electrodes with high energy storage activity.
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Y. Wang, Z. Wang, Y. Xu, W. Chen, G. Shao and B. Hou, Energy Environ. Sci. , 2024, Accepted Manuscript , DOI: 10.1039/D4EE02578D
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“Oh, my gosh,” one Olympian gasped when she got her first look at the hilly, demanding course. “This looks ridiculous.”
By Scott Cacciola
Reporting from Paris
Ed Eyestone is not one for hyperbole. A cleareyed coach and two-time Olympian, he will casually describe his athletes’ 23-mile training runs in a way that makes it sound as if they had gone for brisk walks. He understands that hard training is a part of the profession and that marathons are inherently challenging, so why oversell the struggle?
But ask him about the marathon course at the Paris Olympics , and Eyestone speaks with a sort of reverence that borders on fear.
“This marathon,” he said, “will have a debris field in the final miles.”
Over the past two weeks, thousands of Olympians have tackled the seemingly impossible. Gymnasts have tumbled on 4-inch beams . Skateboarders have gone airborne over rails and ramps . Triathletes have submerged themselves in bacteria-infested waters .
But Paris 2024 organizers may have saved the most sadistic test for last.
Over 26.2 grueling miles this weekend, Olympic marathoners will be forced to contend with a series of steep climbs and quad-crushing downhills that comprise what is almost certainly the most difficult marathon course in the history of the Games.
The challenge, as always, is the pursuit of glory.
The true goal, more likely, will be survival.
“Oh, my gosh,” the Canadian marathoner Malindi Elmore recalled telling her husband when she got her first look at the course in February, “this looks ridiculous.”
Both races, per tradition, will help bring down the curtain at the Games. The men will gather on the start line at Hôtel de Ville on Saturday. The women will race on Sunday, hours ahead of the closing ceremony. But after several weeks in Paris, all will set off knowing that a punishing two-plus-hour torture test awaits.
Long before he was able to see the course in person, Dathan Ritzenhein got a sneak peek. Several employees from the apparel brand On, which sponsors Ritzenhein’s running team , sent him video of the course’s inclines last year.
“It doesn’t look like you’d run up that,” Ritzenhein recalled telling them when he watched the clips. “It’s just comical.”
Ritzenhein coaches Hellen Obiri , a Kenyan who has shown her mettle on hills as the reigning back-to-back champion of the Boston Marathon. But the Paris course is a different beast, and Ritzenhein made sure to familiarize himself with it when he visited the city in July. He tied up his running sneakers and took to the streets so that he could experience the grueling heart of the course, from Mile 9 to Mile 23.
“It’s really hard to imagine how extreme the course is without running it,” he said. “The course is unlike any major marathon these athletes have ever run.”
Olympic organizers have been curiously understated in their own assessments, describing the course in promotional materials as one that “will set demanding conditions for the athletes, because the Paris region is not as flat as it may seem.”
But the people most responsible for its treachery are long gone.
The first half of the course, which heads west toward Versailles, approximates the route taken by thousands of women, early in the French Revolution, who were seeking liberal reforms and sought to confront King Louis XVI at his palace.
The marathon course is a loop. After reaching Versailles, it winds its way back along the left bank of the Seine toward Paris and a finish at the Esplanade des Invalides , a 17th-century hospital that will, all these years later, welcome a fresh stream of broken bodies.
Because the course has hills. Long hills. Hard hills.
The first one is just before the 10-mile mark. Its 4 percent incline, according to Runner’s World , is the same as that of a stretch of the Boston Marathon that includes the notorious Heartbreak Hill. The difference is that the segment in Paris, at about 1.25 miles, is over twice as long as the one in Boston. The course should claim its first victims there.
The second hill is at around Mile 12, and slightly steeper at 5 percent but only about a half-mile long. No sweat, right? Wrong. The first two hills are mere hors d’oeuvres.
At around Mile 18, the race goes from difficult to extreme. The athletes will be deep enough into their mornings that any sort of undulation could cause problems, and Paris has a doozy: another ascent that maxes out at 13.5 percent.
“That hill,” the American Conner Mantz said, “is going to be a big determinant of the race.”
The twist is that after scaling that hill, the runners will almost immediately be running downhill — and at a sharp angle, which could strain their already tired legs.
One of the challenges in training, said Eyestone, the coach, is that running downhill at steep grades can lead to injury. Based on her own research, Elmore concluded that she needed to incorporate downhill running in her training only once every three or four weeks to reap the benefits.
Overall, she said, patience will be essential for the medal contenders — and everyone else.
“You just have to realize that you’re going to be running slower,” said Elmore, who placed ninth in the women’s marathon in hot conditions at the Tokyo Olympics in 2021. “You can’t rely on pace as your feedback during a race.”
In other words, throw away the idea of running consistent mile splits or finishing in a time that comes anywhere near your personal best. That is not going to happen this weekend.
As part of his preparation, the Canadian marathoner Rory Linkletter added hills to his easy runs and generally tried to avoid running on flat terrain. He also ran more than he usually does, peaking at about 130 miles a week, “because I think this race is going to favor people with more of a strength background instead of speed,” he said.
With that in mind, Linkletter, who placed 18th in the men’s marathon at last year’s world championships, prepared as if he were training for a 50-kilometer race, which works out to just over 31 miles, instead of a marathon.
And while he does not necessarily view the Paris course as a potential equalizer among runners of different ability levels, Linkletter does think that it could present a chance for those with less dazzling résumés to be “smarter than your competitors,” he said.
Linkletter, who has a personal best of 2 hours 8 minutes 1 second, includes himself in that unsung group.
“I get excited about the opportunity to beat people who, on paper, I have no business beating,” he said, “because I’m able to do things in a very calculated manner on race day.”
Scott Cacciola writes features and profiles of people in the worlds of sports and entertainment for the Styles section of The Times. More about Scott Cacciola
IMAGES
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Celtic 45 Catamaran Design. Developments in materials technology over the last few decades allows for shapes and strengths that couldn't be built with traditional materials like wood or metal. ... For catamarans, the integral bridgedeck structure doesn't lend itself to a step-wise assembly. The crossbeams and bridgedeck need to be built ...
By using the FE method and a large base, a scale can determine the strength of the longitudinal and structural strength of the ship. Fig. 4. A prototype of the catamaran (Xu et al., 2019). At the research stage carried out on this catamaran structure, design modeling was carried out with a basic scale approach that contained the ship's prototype.
The uniqueness of the catamaran design lies in the cross-structure and the important facets of the cross-structure design are the prediction of the wave-induced loads and the method of structural analysis. The primary loads are the transverse vertical bend-ing moments, axial force, shear, and torsion moment~. Designers have re-
T c = 0.57. Here we put B TR = 1.9 to minimize boat resistance (for her size) and get the draft calculation for a canoe body T c (Figure 1). Midship coefficient - C m. C m = A m / T c (x) B WL. We need to estimate a few coefficients of the canoe body. where A m is the maximum cross section area of the hull (Figure 3).
In addition to their unique structural design, catamarans offer exceptional stability through weight distribution and physics principles. With twin hulls spread apart at a considerable distance, it becomes significantly easier to maintain balance during sailing motions—a significant advantage for those susceptible to seasickness or seeking ...
To develop the structural design of a multihull, a sequence of analyses needs to be followed, supported by results from hydrostatic and dynamic analyses. ... The hull structure of both catamarans and trimarans in welded aluminum generally comprise a longitudinally stiffened beam with stiffener spacing between 20 and 30 cm depending on the hull ...
The catamaran design follows the semi SWATH type. design by having two hulls with a small hull front corner and modeling on INCAT wave-piercing catamaran to determine the. structural response to ...
Bridgedeck catamarans are ideal for cruisers or liveaboard sailors. These vessels feature ample payload-carrying capacity and provide good protection for the crew. Helm locations are usually behind the coach roof bulkhead or in some rare cases on the aft end of the hulls behind the cockpit.
On catamarans , which have two hulls , can be designed with a limited design in shallow wate r, and the hull structure also has a vertical bending moment at the sideload. In previous studies, Xu ...
Structural design issues are reviewed with special interest in composite craft and their improvements. Perspective applications of catamaran concept for different types of craft are indicated ...
One of the problems encountered during the design of the ASR-21 Catamaran is the determination of the effectiveness of the cross-structure deck plating. In this paper, this problem is examined using the Finite Element Method. The behavior of a multicell box girder representing a catamaran cross-structure is studied. Because of the relatively low length-to-breadth ratio of a typical catamaran ...
Project SR-192, "Catamaran Designs" to the Ship Structure Committee CATAMARANS - TECHNOLOGICAL LIMITS TO SIZE AND APPRAISAL OF STRUCTURAL DESIGN INFORMATION AND PROCEDURES by Naresh M. Maniar and Wei P. Chiang M. Rosenblatt & Son, Inc. under Department of the Navy Naval Ship Engineering Center Contract No. N00024-70-C-5145
The stiffness of an Outremer catamaran is incomparable. The main bulkheads are of large dimensions, and so are able to take much greater loads than a cruising multihull might encounter. Inserts in carbon fiber, closed-cell foam, isophthalic resins and high-resistance polyester: everything is designed to guarantee your safety for offshore sailing.
design of a wing sail catamaran for passengers transport (structural analysis) vi taula de continguts acknowledgements iii abstract v taula de continguts vi llistat de figures viii llistat de taules x chapter 1. introduction 11 context 11 pollution and environmental care 13 passenger's transport situation 14 adapt to the environment 15 canary islands 17
Floating cities by design embrace all types of marine activities, so they are complementary to existing activities like fishing and sailing." Nomadia is a multi-deck craft for 3,000 guests.
All modern production catamarans are made with "FRP" construction (for Fiber Reinforced Polymer). Composites aren't new-it's just using materials together to strengthen the whole assembly. Straw was added to bricks centuries ago, and steel reinforced concrete is a staple of construction over the last century.
The structure connecting a catamaran's two hulls ranges from a simple frame strung with webbing to support the crew to a bridging superstructure incorporating extensive cabin and/or cargo space. ... has a catamaran design to accommodate the vessel's stealth features. [67] The Tuo Chiang-class corvette is a class of Taiwanese-designed fast and ...
Both the nacre-like bionic microstructure and the spiral laminated bionic configuration exhibit superior damage-tolerance characteristics. On the basis of this observation, the design concept of the bionic helical-interlayer configuration is innovatively integrated into the design of a bionic nacre-like honeycomb structure.
Specifically, the report provides recommended revisions to Caltrans current Bridge Design Specifications (BDS) pertaining to seismic loading, structural response analysis, and component design. Special attention is given to design issues related to reinforced concrete components, steel components, foundations, and conventional bearings. Funded ...
This contract resulted in the development of the revised BDS presented in this ATC-32 report, which provides a number of recommended improvements to bridge design practice. A companion document, ATC-32-1, includes additional detailed discussion of these recom-mendations. The recommendations apply to the seismic design of bridges throughout ...
T&S Structural Engineers is an employee-owned business providing structural engineering services throughout the state of California and the United States. Call Us 800-579-3881. toggle navigation. About. Who We Are ... Pools We provide a variety of pool shell design services. Our work includes conventional in ground pools, hillside infinity edge ...
The main goal of this work is to design a spine hull beam by adding bulkheads, as the spine beam. provides structural support to the whole catamaran. The catamaran is consisting of a V shaped beam ...
Metamaterial structural adhesives (MSAs), whose properties primarily rely on structural design, offer promising advantages over traditional adhesives, including asymmetric, switchable, and programmable adhesion. However, the effects of thick backing structures on the adhesion properties remain largely underexplored Soft Matter Emerging Investigators Series
The catamaran design follows the semi SWATH type design by having two hulls with a small hull front corner and modeling on INCAT wave-piercing catamaran to determine the structural response to the ship, and the wave slamming process.
Autodesk AEC Collection offre a progettisti, ingegneri e professionisti della costruzione gli strumenti e i workflow integrati per creare con facilità, tutti in un unico pacchetto essenziale.
CONTACT US. 1171 Homestead Road, Suite 275, Santa Clara, CA 95050. 408-615-9200. Submit. Thanks for submitting! Duquette Engineering provides creative engineering solutions that are economical, constructible, and fit for the unique design parameters for each project. Our environment encourages open communication between all members of the ...
Abstract. In order to solve the problem of poor motion performance of cylindrical FPSO, a new motion suppression system scheme is proposed which can make the platform meet the requirements of dry tree operation. The structure design scheme has an impact on the structure safety, construction technology, construction cost and other factors, so it is very important to make clear the structure ...
Enhancing Structural Control in Covalent Organic Frameworks through Steric Interaction-Driven Linker Design A. Winter, F. Hamdi, A. Eichhoefer, K. Saalwaechter, P. Kastritis and F. Haase, Chem. Sci., 2024, Accepted Manuscript , DOI: 10.1039/D4SC03461A This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
More significantly, a flexible all-cloth sodium ion capacitor is assembled by using PCC cathode, HCC anode and cotton cloth separator, which provides stable power output even under bending and cutting conditions owing to its all-woven-structure. In addition, the structural design strategy, structure-activity relationship, and charge/discharge ...
The challenge, as always, is the pursuit of glory. The true goal, more likely, will be survival. "Oh, my gosh," the Canadian marathoner Malindi Elmore recalled telling her husband when she got ...