https://hdl.handle.net/1721.1/1774 2026-04-11T09:04:53Z 2026-04-11T09:04:53Z Hover, Franz S. https://hdl.handle.net/1721.1/52403 2019-04-12T23:36:38Z 2010-03-08T22:05:49Z

Efficient Sequential Monte Carlo Using Interpolation Hover, Franz S. A limitation common to all sequential Monte Carlo algorithms is the computational demand of accurately describing an arbitrary distribution, which may preclude real-time implementation for some systems. We propose using interpolation to construct a high accuracy approximation to the importance density. The surrogate density can then be efficiently evaluated in place of sampling the true importance density, allowing for the propagation of a large number of particles at reduced cost. Numerical examples are given demonstrating the utility of the approach.

2010-03-08T22:05:49Z Hardman, William Soultatis, Charalambos Wolfson, Dianna https://hdl.handle.net/1721.1/3532 2025-02-28T18:50:51Z 2003-07-24T14:48:38Z

Special Operations Forces (SOF) Support Ship Ship Conversion Feasibility Study Hardman, William; Soultatis, Charalambos; Wolfson, Dianna

2003-07-24T14:48:38Z Higgins, Julie Rhoads, Jason Roach, Michael https://hdl.handle.net/1721.1/3531 2025-02-28T18:50:51Z 2003-07-23T18:51:27Z

Advanced Gun System (AGS) Backfit Higgins, Julie; Rhoads, Jason; Roach, Michael

2003-07-23T18:51:27Z Oller, Erik Nikou, Vasilios Psallidas, Konstantinos https://hdl.handle.net/1721.1/3530 2025-02-28T18:50:51Z 2003-07-11T13:35:17Z

Focused Mission High Speed Combatant Oller, Erik; Nikou, Vasilios; Psallidas, Konstantinos

2003-07-11T13:35:17Z Gish, Andrew Ramsey, Steven Temme, Michael https://hdl.handle.net/1721.1/3529 2025-02-28T18:50:51Z 2003-07-11T13:19:54Z

SSGN Conversion to Host ALVIN Gish, Andrew; Ramsey, Steven; Temme, Michael

2003-07-11T13:19:54Z Bebermeyer, Robert Galanis, Konstantinos Price, Shelly https://hdl.handle.net/1721.1/1772 2025-02-28T18:50:51Z 2002-05-30T00:00:00Z

LHA(R): Amphibious Assault Ships For The 21st Century Bebermeyer, Robert; Galanis, Konstantinos; Price, Shelly Amphibious assault ships such as the current LHA and LHD classes are an essential element of the country's ability to exert influence anywhere in the world. The current amphibious assault ships represent the most capable amphibious ships in the world. The LHA 1 class ships are aging, however, with most reaching the end of their expected service lives between 2011 and 2015. It is not feasible to extend the service life of the LHA 1 class due to the rapid technological advances that have taken place during their lifetime. Most have already used their entire growth margin in areas such as combat systems and topside weights. The evolving combat systems and aircraft requirements will only exacerbate these matters. The best solution is to replace the LHA. As the US faces a future with uncertain threats, it is necessary to field a flexible force. In order to make the amphibious forces flexible, selective offload capability must be considered. This allows Marines to access the equipment and vehicles they need for any given operation at any time. A second change that adds a great deal of flexibility is the addition of more ships. Currently, an Amphibious Ready Group (ARG) consists of three ships, an LHA or LHD, an LSD, and an LPD. Replacing the LHA with two ships has several advantages, ranging from increasing the selective offload capability of the ARG to optimally distributing assets among the ships. Most importantly, though, is the ability of the ARG to exert influence over a greater geographic area. In this study, four different options were considered for the future ARG: a. LPD 17, LSD 41, modified LHD 8 plus complement ship variants b. LPD 17, LSD 41, two small LHD variants (2 ships with same hull) c. LPD 17, LSD 41, two new design variants d. LPD 17, LSD 41, single ship LHA(R) variants After modeling a number of variants representing each option, an Overall Measure of Effectiveness (OMOE) and a total lifecycle cost was calculated. Analysis of these variants showed that the variants in Option (a) have a higher OMOE and a relatively lower cost than other options. This study now focuses on the complement ship to a modified LHD 8. A comparison of hull forms, including catamarans, surface effect ships, hydrofoils, trimarans, monohulls, semi-planing monohulls, led to the selection of a trimaran, primarily for its ability to transport equipment at a high speed over a long range. In order to keep the size (and cost) of the ship down, the ship will not carry any landing craft. The nominal amphibious lift capacity of the trimaran complement ship is

2002-05-30T00:00:00Z Gregor, Jeffrey Hootman, John Price, David Psillidas, Kostas Whalen, Todd https://hdl.handle.net/1721.1/1771 2025-02-28T18:50:51Z 2002-02-01T00:00:00Z

Cobra Judy II Conversion Gregor, Jeffrey; Hootman, John; Price, David; Psillidas, Kostas; Whalen, Todd The strategic community relies heavily on the Cobra Judy (CJ1) instrumentation to provide high-quality radar and telemetry data for ballistic missile system testing and development. The current CJ1 platform, USNS Observation Island (T-AGM 23), will be 50 years old in 2003, and the CJ1 system requires an upgrade in technology. This report investigates the feasibility of converting an existing ship to a Mobile Test Range Asset in order to field a platform carrying the Cobra Judy II (CJ2) system on a much newer ship. Based on a review of available hull forms and prior research, the Henry J. Kaiser class oiler (T-AO 187) was found to be the most suitable conversion candidate. All equipment pertaining to underway replenishment (UNREP) was removed and replaced with components of the CJ2 system. Additionally, systems to provide ballast and electrical power were evaluated and installed, as necessary. The Advanced Surface Ship Evaluation Tool (ASSET), Program of Ships Salvage and Engineering (POSSE), and Ship Wave Analysis (SWAN) software tools were used to evaluate the converted ship's general, structural/stability, and seakeeping characteristics, respectively. The MIT Cost Model was used to estimate conversion costs, excluding acquisition costs of CJ2 sensors. The following table summarizes the characteristics of the CJ2 ship conversion design. CJ2 Conversion Design Summary LBP 650 ft B 98 ft T 31 ft Full Load Displacement 35161 ltons KG 32.6 ft GMT/B 0.093 Max. Speed 20 knots Range 9300 nm (at 15 kts) Seakeeping Operable in Sea State 5 Conversion Cost 179 MDo

2002-02-01T00:00:00Z Woertz, Jeff Oller, Erik Withee, Erek https://hdl.handle.net/1721.1/1770 2025-02-28T18:50:51Z 2002-02-01T00:00:00Z

Deep Research Submarine Woertz, Jeff; Oller, Erik; Withee, Erek The Deep Sea Research Submarine (Figure 1) is a modified VIRGINIA Class Submarine that incorporates a permanently installed Deep Sea Operations Compartment (Figure 2). Table 1 summarizes the characteristics of the Deep Sea Research Submarine and the Deep Sea Operations Compartment. The compartment, inserted as a 46-ft parallel midbody section, carries a heavy lift system capable of retrieving a 15-ton object (submerged weight) from depths greater than 2400 ft. A 26-ft L x 22-ft H x 12-ft W payload bay external to the pressure hull is used to house the object for transport. This payload bay also serves as a fully functioning mid-ship Main Ballast Tank. The compartment is supported by a combination of ship service and compartment-specific auxiliary systems. Figure 1. Deep Sea Research Submarine The compartment also contains a 16 ft diameter x 17 ft high Remotely Operated Vehicle (ROV) Chamber outfitted with a Triton ZX ROV capable of excursions to depths of 9800 ft. The ROV Chamber permits dry access to the ROV for maintenance and mission-related tasks. The control center for the lift system and the ROV and a "mission flexible" space are located on the compartment's upper deck Figure 2. Deep Sea Operations Compartment Table 1. Deep Sea Research Submarine and Deep Sea Operations Compartment Principle Characteristics Deep Sea Research Submarine Length 423 ft Diameter 34 ft Draft 28 ft 5 in Speed Reduction 11% Surfaced Displacement 7861 lton Submerged Displacement 8870 lton LCG 192.06 ft GMT 1.05 ft Reserve Buoyancy 12.8% Deep Sea Operations Compartment Length 46 ft NSC Weight 999.1 lton Submerged Lifting Capacity 14.7 lton Maximum ROV Depth 9800 ft Maximum Retrieval Depth > 2400 ft Conversion Cost 20 % as Percentage of Baseline Virginia Cost Estimated Conversion Cost $650 millio

2002-02-01T00:00:00Z Chryssostomidis, Chryssostomos Bernitsas, Michael Burke, David https://hdl.handle.net/1721.1/1769 2019-04-10T19:30:15Z 2000-05-16T00:00:00Z

Naval Engineering A National Naval Obligation Chryssostomidis, Chryssostomos; Bernitsas, Michael; Burke, David As part of its national obligations, ONR must ensure US world leadership in those unique technology areas that insure naval superiority. ONR accomplishes this mission through research, recruitment and education, maintaining an adequate base of talent, and sustaining critical infrastructure for research and experimentation. One critical area requiring support by ONR is the "knowledge infrastructure" in Naval Architecture and Marine Engineering. An innovative knowledge infrastructure in NA & ME consists of two main elements: • People who have the knowledge, skills and experience to perform innovative design and engineering applied to in Naval Architecture and Marine Engineering; and • An industry that employs these people and allows this innovative knowledge to be applied in the ships it designs and builds for the Navy. The universities along with industry develop the technology and educate the people who are employed by industry. In turn, the research supported primarily by the government provides direct support for the conduct of research and the education of the future faculty who perform their doctoral research in this discipline. This study examined the current situation in navy related Naval Architecture and Marine Engineering. The need for ONR support in this area is identified and recommendations made to establish long term support that will provide for the introduction of innovative technology in naval ships. The following are documented in this report to establish this need: (1) The uniqueness of "Engineering for the Marine Environment" is explained. Naval Architecture and Marine Engineering, among all engineering disciplines, studies the design of complex marine systems and their performance in the marine environment. The latter is stochastic in nature and exerts motion and vibration dependent loads. (2) The uniqueness of analysis, design, and manufacture of naval ships is presented. A key unique aspect of naval ship design is the need for new capabilities in performance such as high speed while remaining affordable. (3) A vision of the role and knowledge of the NA&ME professional of the future is presented. In a distributed simulation based environment, naval architects will lead the design effort by contributing the expertise in marine mechanics, design of complex marine systems, and design for manufacturing. Naval Architects are trained in marine mechanics and the design of complex marine systems. This breadth of skills will be even broader in the future while remaining base on experience in designing naval ships. (4) The Navy need for a solid national knowledge infrastructure in NA&ME is established. Accordingly, the need for ONR support of research and education in the few healthy NA&ME Departments remaining in top tier US universities is very strong. (5) Navy needs for breakthroughs in such areas as survivability of structures, stealth and hydrodynamic performance, and adaptive structures are identified. From those, fundamental research that naval architects are uniquely qualified to perform for ONR is specified. (6) A selective industry survey has established the areas of technical expertise needed. Naval Architecture and Integrated Ship Design and Shipbuilding and Manufacturing Technology top the list. (7) Freshmen in engineering, the few universities remaining active in teaching and research in NA&ME, ONR, and the shipbuilding industry are the parties involved in this problem. The challenges each party faces are discussed. (8) The urgency for ONR to help preserve the knowledge infrastructure in NA&ME is assessed based on current national trends in funding and student choices. (9) An educated estimate of the national need for naval architects is presented and used as a basis for establishing the level of long term funding in research and education required for a steadily healthy and competitive higher education environment. (10) An implementation plan for a vigorous knowledge infrastructure and a healthy university environment is proposed. This plan abides by the ONR mandate of supporting fundamental, high risk, innovative research needed by the Navy. It calls for: • A research program centered on National Challenge Initiatives with the intent to revolutionize the state of the art in ship analysis and design and to bring the participants, industry, government and academia, in this endeavor closer together in perspective and time for innovation. • Acknowledging NA&ME as a specialty area of basic research. This is typically done by federal research funding agencies. As an example, in NSF, mechanical, civil, electrical, chemical, etc. are established specialty areas. • Modernization of contents and methods of delivery of marine curricula. • Industrial participation in both research and education activities.

2000-05-16T00:00:00Z