作者：
JOHNSON, RACARACOSTAS, NPCOMSTOCK, ENMr. Robert A. Johnson is currently a Naval Architect in the Hull Group (SEA 32)
Ship Design and Integration Directorate Naval Sea Systems Command. He received his Associate in Engineering degree in Drafting and Design Technology in 1959 his B.S. degree in Aerospace Engineering in 1965 and his M.S. degree in Engineering Mechanics in 1970 all from Pennsylvania State University. In 1973
he was selected for the Navy's Long-Term Training Program at the University of Michigan from which he received his M.S.E. degree in Naval Architecture in 1974. Mr. Johnson began his professional career at the Ordnance Research Laboratory Pennsylvania State University in 1959 where he was involved in the design of hydroelastic submarine models and conducted research in the area of flow-induced structural vibrations. Subsequently he joined HRB-Singer at State College Pennsylvania in 1967 as a Research Engineer and in 1969 joined the former Naval Ship Engineering Center (NAVSEC) where he was employed in the Submarine Structures Branch Surface Ship Structures Branch and the Performance and Stability Branch of the Hull Division. Currently he is the CASDAC Hull System Technical Director and also Head of the Surface Ship Hydrodynamics Section (SEA 32133) Naval Architecture Division Naval Sea Systems Command a member of ASE
SNAME and Tau Beta Pi and one of the Navy Subcommittee Members of the Ship Structures Committee.Mr. Nicholas P. Casacostas is currently a Section Chief for Naval Architecture in the Washington
D.C. office of M. Rosenblatt & Son Inc. His professional career has been in both Navy and commercially related fields and he has had published several technical papers dealing with the subjects of Ship Propulsion and Hydrodynamics as well as Shipping Economics and Operations. A member of ASNE since 1977 he also is a member of the Royal Institute of Naval Architects and SNAME and presently serving on the latter's H-2 (Resistance and Propulsion) Panel. Mr. Edward N. Comstock is currently a Seakeeping Speciali
The recent trend in Naval Forces has been a shrinking Fleet in both numbers and ship size. This dictates that our ships must have greater operational effectiveness if the Navy is to continue to carry out its mission i...
The recent trend in Naval Forces has been a shrinking Fleet in both numbers and ship size. This dictates that our ships must have greater operational effectiveness if the Navy is to continue to carry out its mission in the future as it has done in the past. The seakeeping performance of a ship is a major determinant of its overall operational effectiveness. The methodology presented in this paper is a comprehensive approach to the evaluation of a ship's seakeeping performance. The scope of this methodology encompasses the assessment of ship mission scenarios and the relative importance of associated mission requirements as well as the probabilistic description of the uncertainties imposed by the variable ocean environment. The methodology is presented in a general sense so that the seakeeping performance of a ship's configuration can be evaluated as a function of mission scenario, mission area, sea state, ship heading, and speed. In order to utilize the full potential of the methodology, more refined scenario descriptions and more accurate environment specifications must be obtained. A simplified example is presented in which a comparison of the operational effectiveness of two small hull forms is made, using information now available to the designer. It is anticipated that the methodology presented can be used not only as a powerful tool in the decision-making process of practical ship design, but also as the basis for parametric studies of mission strategies.
A method based on available energy concept of thermodynamics is presented for the analysis of heat availability in a distillation system which consists of a column-internal and heatexchange subsystems. A heat availabi...
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The synthesis of processcontrolsystems is placed in a series of process design activities which involve the basic process design and the establishment of plant operation strategy. For a given preliminary process sch...
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The synthesis of processcontrolsystems is placed in a series of process design activities which involve the basic process design and the establishment of plant operation strategy. For a given preliminary process scheme, a systematic procedure is presented for the synthesis of processcontrolsystems that contributes to complete process flow diagrams by adding information on processcontrolsystems. An illustrative example shows the usefulness of the proposed logical framework.
The study starts with the new viewpoints used by Honeywell as basis for the development of the TDC 2000 Total Distributed control System. Secondly, the system architecture is discussed, as follows: TDC 2000 controller...
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The study starts with the new viewpoints used by Honeywell as basis for the development of the TDC 2000 Total Distributed control System. Secondly, the system architecture is discussed, as follows: TDC 2000 controller, a standard eight function multi input-output controller, capable of being configured on-site to users' requirements. The controller is interfaced to the Data Hiway, thus allowing remote supervisory equipment full access to local control data. Operator Station provides operator with relevant process information, accepts operator commands for a kayboard and makes necessary changes over the communication system. Interface with computers is arranged by communication through Data Hiway. Computer thereby may access and alter distributed data base of controllers to ascertain the status of each loop for data acquisition or to directly control the setpoints or outputs for supervisory and DDC operation. After that the scope of the TDC 2000 system at Kaipola Mills is introduced together with other instrumentation included as well as the operating principles of the system. As summary, a review of special actions required by the new system and an estimate of the success of the whole instrumentation.
作者：
Przvbvlskl, Frank J.Demark, AnthonyHohmann, JereSenior Development Engineer
Honeywell Inc. Process Control Division Fort Washington Pennsylvania United States Supervisor
Microprocessor Control Systems Honeywell Inc. Process Control Division Fort Washington Pennsylvania United States Manager
Digital Technology Development Leads and Northrup North Wales Pennsylvania United States
The availability of low cost, reliable, microprocessors has substantially reduced the cost and widened the applicability of digital control. This paper describes a custom MOS IC that fulfills the need of a modern, mic...
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Examples of the application of “Design-to-Cost” are presented in the framework of the recent Naval Sea systems Command Instruction, “Design-to-Cost” Guide for Ship Acquisition. The central theme of these examples ...
Examples of the application of “Design-to-Cost” are presented in the framework of the recent Naval Sea systems Command Instruction, “Design-to-Cost” Guide for Ship Acquisition. The central theme of these examples is the determination of cost leverages for “Design-to-Cost” savings. To date such cost savings have concentrated in the area of highly visible military characteristics and have not seriously impacted the remainder of the ship design. Reduction in not-so-visible design margins, practices, and criteria also offer practical cost savings. Ship design margins should be established in consideration of cost leverages as well as by reason of uncertainty and lack of design definition. Subsystem design practices should be established in consideration of cost leverages contained in their performance margins. It is concluded that an engineering definition of “Design-to-Cost” should be the specification of margins, practices, and criteria for the design of a particular ship in its budget environment followed by design control to assure that the specifications are met.
Several aspects associated with the identification and direct digital stochastic control of a steam‐jacketed continuous stirred tank process are investigated. Using data collected under closed‐loop conditions by an...
This paper describes TRANSIM simulation a a method for solving problems. There is a brief discussion of modeling and its importance. TRANSIM is compared with other general purpose simulators, special purpose simulatio...
Two basic approaches in process simulation—sequential and simultaneous—are investigated. The method of successive substitutions is used to make a comparison of the basic characters of those two approaches. Sufficien...
We consider the problem of a tandem cold rolling mill to achieve correct output gauge, and satisfactory shape, and surface finish. The essential process variables are roll force, shape and thermal roll crown. The form...
We consider the problem of a tandem cold rolling mill to achieve correct output gauge, and satisfactory shape, and surface finish. The essential process variables are roll force, shape and thermal roll crown. The formulation of the equations for these key variables is described. The scheduling problem is formulated as a constrained two point boundary value problem. This is solved using conjugate gradient and projection techniques developed for optimal control problems. Results showing the improvements which can be made in strip shape and general mill operating conditions, by optimising the schedules, are included and discussed.
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