作者：
Giles, Roscoean associate professor in the Electrical
Computer and Systems Engineering Department and a member of the Physics Department at Boston University (Boston MA). He also serves as deputy director of the Center for Computational Science at Boston University.
Roscoe Giles; What does computation have to do with “real” physics?, Computer in Physics, Volume 7, Issue 5, 1 September 1993, Pages 485, https://***/10.106
Roscoe Giles; What does computation have to do with “real” physics?, Computer in Physics, Volume 7, Issue 5, 1 September 1993, Pages 485, https://***/10.106
作者：
SUITT, DGIRONA, FDennis Suitt:is a mechanical engineering technician in the Mechanical Transmissions Branch
Propulsion and Auxiliary Systems Department Carderock Division Naval Surface Warfare Center Annapolis Md. Currently Mr. Suitt is the project leader for the Navy's R&D effort to develop the design for a standard family of composite material pumps. Francisco Girona:has been employed as a mechanical engineer in the Pump Branch
Auxiliary Equipment Division Auxiliary Systems Subgroup of the Naval Sea Systems Command since 1989. Currently Mr. Girona is the NavSea project engineer assigned to the development of a standard family of composite pumps. Prior to his employment with the Navy Mr. Girona was employed for 11 years with the Worthington Pump Company as an applications engineer in the General Industry Process and APL Industry and the Marine and Navy Industry Divisions. Mr. Girona graduated from West Virginia University in 1977 with a bachelor of science degree in mechanical engineering.
This paper discusses a program to develop a family of standard design, low-pressure, composite material centrifugal pumps for Navy surface ship applications. The need for and the benefits derived from the development ...
This paper discusses a program to develop a family of standard design, low-pressure, composite material centrifugal pumps for Navy surface ship applications. The need for and the benefits derived from the development of this standard family of centrifugal pumps is discussed. Foremost of the projected benerits is a savings of 25% in acquisition and provisioning costs as well as significant reduction in integrated logistic supply costs. Additional benefits detailed are the reduction of maintenance requirements and improvements in serviceability expected from pumps manufactured from composite materials. A program to evaluate commercial composite pumps to determine compliance with Navv design requirements is detailed. The design criteria for the standard family of composite pumps is provided as is the status of a competitively awarded contract for this design. Contained within the discussions of the contract status is a description of efforts to provide state-of-the-art sealing for the new pumps. The paper also addresses the manner in which the standard design composite pumps will be introduced to the neet.
Presents a scalable algorithm for short-range molecular dynamics which minimizes interprocessor communications at the expense of a modest computational redundancy. The method combines Verlet neighbor lists with coarse...
详细信息
Presents a scalable algorithm for short-range molecular dynamics which minimizes interprocessor communications at the expense of a modest computational redundancy. The method combines Verlet neighbor lists with coarse-grained cells. Each processing node is associated with a cubic volume of space and the particles it owns are those initially contained in the volume. Data structures for 'own' and 'visitor' particle coordinates are maintained in each node. Visitors are particles owned by one of the 26 neighboring cells but lying within an interaction range of a face. The Verlet neighbor list includes pointers to own-own and own-visitor interactions. To communicate, each of the 26 neighbor cells sends a corresponding block of particle coordinates using message-passing cells. The algorithms has the numerical properties of the standard serial Verlet method and is efficient for hundreds to thousands of particles per node allowing the simulation of large systems with millions of particles. Preliminary results on the new CM-5 supercomputer are described.< >
Discusses issues relating to the complexity of scientific visualization software system implementation. It is argued that the complexity of current implementations of such systems may limit the utility for users becau...
详细信息
ISBN:
(纸本)9780818628962
Discusses issues relating to the complexity of scientific visualization software system implementation. It is argued that the complexity of current implementations of such systems may limit the utility for users because the interfaces typically require significant knowledge of the data being studied and the applicable visualization algorithms, as well as its infrastructure of graphics, imaging and data handling technology. The issues, unknowns, and possible solutions associated with building effective scientific visualization software are discussed.< >
作者：
JACOBS, KSELFONT, MPROCACCINO, VMark Elfont
Ph.D:. is head of the Engineering Analysis Staff at the Naval Ship Systems Engineering Station (NAVSSES). At NAVSSES Dr. Elfont developed the Ships Machinery Analysis and Reporting Technique (SMART) System that utilizes direct access to the Ships 3-M database to calculate the fleet performance of HM&E systems. The SMART process is an automated approach to performance trending and offers the in-service engineers and life cycle managers cost effective information on the performance of equipments and systems in the actual fleet environment. Prior to coming to NAVSSES Dr. Elfont was at the Naval Air Development Center (NADC) for 18 years with most of his service as program manager for various avionic weapon system developments. Dr. Elfont also spent three years as the business manager of a private telecommunication firm. Vincent Procaccino:is the measures of effectiveness coordinator within the Performance and Business Indicators Section of the Equipment Assessment and Alteration Department
Naval Ship System Engineering Station (NAVSSES). Mr. Procaccino is responsible for developing processes and techniques for determining the effectiveness of condition assessment efforts primarily the Assessment of Equipment Condition (AEC) program. NAVSSES is the Navy's in service engineering agent for HM&E equipment and is currently pursuing several programs which are in the process of evaluating condition assessment of HM&E systems. The efforts include continuous on-line monitors and expert system applications. Prior to arriving at NAVSSES in December 1988 Mr. Procaccino received a bachelor of science degree in mechanical engineering from Penn State University in August of 1987. He then worked as a project engineer for a small manufacturing firm until his arrival at NAVSSES.
Recent developments in surface ship maintenance strategies have been advanced on the promise of achieving reduced maintenance costs and improving the availability of shipboard systems. Included in the melange of propo...
详细信息
Recent developments in surface ship maintenance strategies have been advanced on the promise of achieving reduced maintenance costs and improving the availability of shipboard systems. Included in the melange of proposed solutions are the Phased Maintenance Concept, Condition Based Maintenance, Expert System Diagnostics, as well as many other variations of these notions. As programs are initiated to evaluate prototype systems, or in some cases install production units, it is crucial that effective measurement procedures be instituted to determine to what extent the respective program goals and objectives are achieved. This paper explores various data sources that offer potential application to evaluation of advanced maintenance concept effectiveness. Also examined are data analysis and reporting techniques to clearly identify the benefits gained from those activities. The authors feel that it is important that the process of effectiveness evaluation, while remaining an objective process, become a part of the maintenance process itself. Maximum use of existing databases and in-place data collection procedures is advocated.
A feasible directions algorithm is proposed for efficient solution of a min-max formulation for model predictive control, which arises when there is uncertainty in the model of the system. The output of the model is a...
详细信息
A feasible directions algorithm is proposed for efficient solution of a min-max formulation for model predictive control, which arises when there is uncertainty in the model of the system. The output of the model is assumed to be a linear function of some unknown parameters. The algorithm always tries to choose the steepest possible descent direction.< >
A molecular dynamics algorithm for performing large‐scale simulations on the Connection Machine, a massively parallel supercomputer, is discussed. The algorithm uses a cell data structure to obtain the near neighbors...
A molecular dynamics algorithm for performing large‐scale simulations on the Connection Machine, a massively parallel supercomputer, is discussed. The algorithm uses a cell data structure to obtain the near neighbors of each particle as the fluid evolves. The main features of the data structure are that one processor per particle is used to integrate the equations of motion of each particle and one processor per cell is assigned to compute the interparticle forces. The results for Lennard‐Jones fluids of 15 000 to 500 000 particles indicate that the algorithm scales linearly with the number of particles.
The underlying hypothesis of the case study described is that the development, implementation, operations, and maintenance of large, complex, data-intensive applications, such as computer-integrated manufacturing, can...
详细信息
The underlying hypothesis of the case study described is that the development, implementation, operations, and maintenance of large, complex, data-intensive applications, such as computer-integrated manufacturing, can be simplified through the use of object-oriented database management systems (DBMSs). The objective of the case study is to verify this hypothesis. The approach is to prototype selected representative components of a computer-integrated-manufacturing system; these components have been developed on top of a relational DBMS, using an object-oriented DBMS, called Iris. The fundamental elements of the data model of Iris are objects, types, and functions. An Iris object is represented by a unique identifier. Each object is associated with at least one type. This association supports classification. An object is said to be the instance of the types with which it has classification associations. The results of the study illustrate that the object-oriented prototype has a superior schema, is capable of providing convenient access to information, and is easier to extend and maintain.< >
暂无评论