The temperature-heat content diagram ( T-Q diagram) is widely applied to the thermodynamic analysis and synthesis of processsystems. In this paper, a Heat Demand and Supply Diagram (HDS diagram) which is an extension...
详细信息
The temperature-heat content diagram ( T-Q diagram) is widely applied to the thermodynamic analysis and synthesis of processsystems. In this paper, a Heat Demand and Supply Diagram (HDS diagram) which is an extension of the T-Q diagram has been proposed. The HDS diagram enables a better understanding of heat utilization in processsystems by representing the T-Q relationships of net heat demand and supply. The examples have demonstrated that the HDS diagram can be successfully applied in the improvement of heat utilization, such as debottlenecking on heat recovery,heat integration and appropriate selection of utility heat sources and sinks.
The equations of motion for a robotic manipulator are a very lengthy and complicated set of nonlinear, highly coupled differential equations. A simplified model that reveals the dominant dynamics would be valuable for...
详细信息
The equations of motion for a robotic manipulator are a very lengthy and complicated set of nonlinear, highly coupled differential equations. A simplified model that reveals the dominant dynamics would be valuable for purposes of utilizing modern control theory. In this work, a method is presented for obtaining a reduced model for a nonlinear system. The structure of the simplified model is assembled from a library of the nonlinear basis terms that were present in the original model. This p-term structure is selected from the library in p-stages using a recently developed optimization scheme based on projection matrices and conjugate direction ideas. The algorithm is used to identify the dominant dynamics of several robot manipulator models and the results are verified on the GCA P300V robot in RPI's Robotics and Automation Laboratory.
作者：
DUNIETZ, ISHSU, JLCMCEACHERN, MTSTOCKING, JHSWARTZ, MATROMBLY, RMThe authors
Irwin S. Dunietz John L.C. Hsu Michael T. McEachern James H. Stocking Mark A. Swartz andRodney M. Tromblyare responsible for design and development of the Manufacturing Process Control System. Mr. Dunietz joined AT&T in 1980. He is a member of the technical staff in the Manufacturing Information Automation department at AT&T Engineering Research Center Princeton New Jersey. He received an A.B. in mathematics from Cornell University and an M.S.E. in computer science from Princeton University. Mr. Hsu who joined AT&T in 1970 is a department head in the Manufacturing Information Automation department at the Engineering Research Center. He received an M.S. in electrical engineering from the University of Missouri. Mr. McEachern joined AT&T in 1962 and is a supervisor in the 5ESS™ Line Unit Manufacturing department at AT&T Technologies in Oklahoma City Oklahoma. He is responsible for the manufacturing process control center in Oklahoma City which provides computerized support for all circuit pack manufacturing. Mr. Stocking who joined AT&T in 1975 is a supervisor in the Manufacturing Information Automation department at the Engineering Research Center. He received a B.S. in chemical engineering from Rensselaer Polytechnic Institute and a Ph.D. in chemical engineering from the University of California Berkeley. Mr. Swartz joined AT&T in 1980 and is a member of the technical staff in the Manufacturing Information Automation department at the Engineering Research Center. He received an A.B. in computer science from Cornell University and an M.S. in computer science from Rutgers—The State University. Mr. Trombly who joined AT&T in 19 78 is an assistant manager at the AT&T Merrimack Valley Works in Massachusetts. Previously he was a supervisor at the Engineering Research Center. He holds a B.S. in computers and systems engineering and an M.S.E.E. from Rensselaer Polytechnic Institute.
The central challenge of all manufacturing is making products to the right standards and delivering them at the right time. AT&T is upgrading its corporate and factory resource planning systems to improve control ...
详细信息
The central challenge of all manufacturing is making products to the right standards and delivering them at the right time. AT&T is upgrading its corporate and factory resource planning systems to improve control of day-to-day manufacturing. The Manufacturing processcontrol System (MPCS), developed at the AT&T engineering Research Center (ERC), provides this support. MPCS connects the shop floor with production scheduling, accounting, product data archive, and engineering support systems.
AbstractSan Juan Generating Station is a coal‐fired power plant utilizing the Wellman‐Lord SO2recovery process for meeting SO2compliance regulations. A sulfuric acid plant was designed and built for reliably produci...
详细信息
AbstractSan Juan Generating Station is a coal‐fired power plant utilizing the Wellman‐Lord SO2recovery process for meeting SO2compliance regulations. A sulfuric acid plant was designed and built for reliably producing a saleable product from the recovered SO2. Criteria are presented to describe some of the features incorporated into the plant design to meet this unique applicat
作者：
FLEGAL, WMHANEY, EAELLIOTT, RSKAMINO, JTERNST, DNWilliam M. Flegal
Eugene A. Haney Ray S. Elliott John T. Kamino: andDavid N. Ernstare engineers in AT&T Network Systems Media Division Atlanta Georgia. They are responsible for preform and single-mode fiber process development and fabrication. Mr. Flegal received a B.S. M.S. and Ph.D. in Mechanical Engineering from the Georgia Institute of Technology and joined AT&T in 1970.
Optical fibers for telecommunications consist of a core of high-purity doped silica and a silica cladding. The fiber, which has a diameter of 125 mu m, is drawn from a preform, and replicates its dimensional and refra...
详细信息
Optical fibers for telecommunications consist of a core of high-purity doped silica and a silica cladding. The fiber, which has a diameter of 125 mu m, is drawn from a preform, and replicates its dimensional and refractive-index characteristics. A process to produce preforms named the Modified Chemical Vapor Deposition (MCVD) process uses a fused quartz tube on whose inner surface layers of high-purity glasses are deposited. The tube subsequently becomes the fiber cladding. Although multimode systems were very successful, it soon became apparent that the future belonged to single-mode systems. A single-mode fiber does not have modal dispersion problem and, therefore, has a bandwidth many times higher. Continued growth in the demand for single-mode fiber cables has resulted in the conversion of over 90 percent of production capacity to single-mode products.
作者：
NETZER, DCombustion Engineering Inc
Randall Process Systems Houston TX USA Combustion Engineering Inc Randall Process Systems Houston TX USA
The Randall process for CO//2 separation uses very low CO//2 recompression energy and almost negligible heat energy for solvent regeneration. Overall light hydrocarbons recovery on heat content basis is more than 97% ...
详细信息
The Randall process for CO//2 separation uses very low CO//2 recompression energy and almost negligible heat energy for solvent regeneration. Overall light hydrocarbons recovery on heat content basis is more than 97% in this high-pressure process which uses a water-based physical solvent or pure water for separation. CO//2 regenerated at relatively high pressure and liquefied while used as a heat source for CO//2-hydrocarbons fractionation. Oxidation of residual H//2S in the CO//2 is incorporated into the CO//2 absorption system. This approach to CO//2-hydrocarbon-H//2S separation integrates CO//2 absorption fractionation and H//2S removal.
A mathematical model is developed for a fairly large class of so-called fed-batch fermentation processes. The model consists of a set of non-linear stochastic differential equations. Measurements of a linear combinati...
详细信息
A mathematical model is developed for a fairly large class of so-called fed-batch fermentation processes. The model consists of a set of non-linear stochastic differential equations. Measurements of a linear combination of states with additive noise are available at sampling instants. Our objective is to control the system such that it follows same prespecified trajectory. An integral criterion is formulated which should be minimized to achieve the desired system performance. The non-linear stochastic differential equations are linearized around the prespecified trajectory. The linearized continuous time system is transformed into an equivalent discrete time system (EDS) and the integral criterion is transformed into a sum criterion. Robustness of the control is achieved by applying adaptive control to the fermentation process. The EDS is rewritten as an ARMAX-representation and the sum criterion is formulated in terms of output and control rather than in terms of states and control. The relation between the parameters of the ARMAX-mode1 and the original microbiological parameters are established. Finally an adaptive control law is formulated, which, under certain restrictive conditions, will be close to optimal with respect to the averaged quadratic sum criterion.
作者：
EICHINGER, BJThe Author is head of the Water Technology and Process Materials Section
Naval Ship Systems Engineering Station (NAVSSES) in Philadelphia. She graduated from Marywood College in 1965 with a bachelor's degree in chemistry. Ms. Eichinger began her career with the Navy as an analytical chemist responsible for resolution of shipboard problems involving water water-formed deposits corrosion contamination and chemical cleaning. She with NAVSSES engineers corrected significant fleet problems arising from contaminants in submarine main hydraulic fluid systems and distillate fuel systems. Ms. Eichinger coordinated with the Naval Sea Systems Command to develop evaluate and implement the water treatment program now in use for all non-nuclear naval propulsion and auxiliary water and steam systems. She is a current member of the American Society of Mechanical Engineers and the author of the Naval Ships' Technical Manual chapter Boiler Water/Feedwater Test and Treatment.
The causes and effects of corrosion and contamination in conventional steam generator systems are described briefly. Treatment and control methodologies currently used by the Navy for feedwater, steam, condensate, and...
详细信息
The causes and effects of corrosion and contamination in conventional steam generator systems are described briefly. Treatment and control methodologies currently used by the Navy for feedwater, steam, condensate, and boiler water are detailed. Examples are cited of the manner in which Navy personnel are trained in interpretation of analytical data and in trend analysis in order that the ship can exercise preventive and corrective control of problems. Ancillary subjects discussed include chemical cleaning, mechanical cleaning, and out-of-service preservation. An overview of planned improvements is provided.
作者：
Groves, D.M.Exxon Chemical Co
Process Control Systems Baytown TX USA Exxon Chemical Co Process Control Systems Baytown TX USA
This paper examines the retrofit of a sophisticated control system into an existing petrochemical complex. Exxon has been pursuing modern processcontrolsystems development since the early 1960's. These systems g...
详细信息
ISBN:
(纸本)0876648014
This paper examines the retrofit of a sophisticated control system into an existing petrochemical complex. Exxon has been pursuing modern processcontrolsystems development since the early 1960's. These systems generally include improved instrumentation, control computers, and the expanded use of analyzers, all aimed at improved higher level control. In the 1963-1965 time frame, Exxon began to explore the use of electronic instrumentation coupled with computers.
作者：
Britton, RobertRosemount Inc
Process Control Systems Burnsville MN USA Rosemount Inc Process Control Systems Burnsville MN USA
Many economic, technical, and market forces will affect the future of the process industry, and the equipment used for control. This article looks at the forces, and predicts what changes are in store for users and ma...
详细信息
Many economic, technical, and market forces will affect the future of the process industry, and the equipment used for control. This article looks at the forces, and predicts what changes are in store for users and manufacturers alike. Subjects covered include production changes, buying patterns, market characteristics, and others.
暂无评论