Showing papers on "Modeling and simulation published in 1986"
Proceedings Article•
01 Jan 1986
51 citations
TL;DR: It is shown that the kinematic control rod on the INSAT has a synchronizing function very similar to that of the closed cable loop on the INTELSAT-V spacecraft.
Abstract: This paper presents the dynamic and digital simulation of the deployment of rigid solar panels on INTELSAT-V and INS AT spacecraft. Each spacecraft is characterized by very distinct mechanisms for its solar array deployment. The arrays on INTELSAT-V are in a topological tree configuration, while the INSAT arrays are in a closed-loop configuration because of the four-bar linkage deployment mechanism. It is shown that the kinematic control rod on the INSAT has a synchronizing function very similar to that of the closed cable loop on the INTELSAT-V spacecraft. Practical aspects of the modeling and simulation of complex deployment mechanisms are emphasized. The use and limitations of the DISCOS multibody code for deployment dynamics simulations are discussed, and the need for developing specialized simulation tools emphasized.
38 citations
01 Dec 1986
TL;DR: The System Iconic Modeling Facility is described, developed with the goal of minimizing the time required to model and simulate a system, either proposed or existing, and the properties of SIMF that enable it to achieve this goal.
Abstract: As government budgets tighten, contractors are increasingly concerned with improving the cost effectiveness of proposed system architectures. One method currently being used to convince customers of the feasibility of a design is the modeling and simulation of the design. The simulation of a proposed design can, however, substantially increase the cost of a proposal, both in dollars and hours.This paper describes the System Iconic Modeling Facility (SIMF), developed with the goal of minimizing the time required to model and simulate a system, either proposed or existing. The paper emphasizes the properties of SIMF that enable it to achieve this goal.
9 citations
01 Dec 1986
TL;DR: The INSIGHT simulation language describes systems in a quick, simple, and compact fashion using a network representation, and the process of simulation modeling and the results from the simulations combine to provide “insight” into problem solving.
Abstract: The INSIGHT simulation language describes systems in a quick, simple, and compact fashion using a network representation. This description can be entered and simulated using novel interactive facilities that relieve the user of needing to know specific syntax, while promoting a greater understanding of model behavior. Statistics summarizing the simulation are produced automatically, but can be greatly enhanced by various input models and output analysis mechanisms. Use of the language does not require programming and complex models use the descriptive features of simple ones, incorporating more elaborate specifications and more sophisticated concepts. INSIGHT is available for most computers and is portable across machines. The language has been extensively applied and its scope of applications has ranged from manufacturing to service environments. Using INSIGHT the process of simulation modeling and the results from the simulations combine to provide “insight” into problem solving.
6 citations
4 citations
01 Apr 1986
TL;DR: This paper describes a computer-aided-design package for PWM dc-dc converters that captures a converter circuit schematically and then provides steady-state solution, frequency responses, or time-domain waveforms of the converter.
Abstract: This paper describes a computer-aided-design package for PWM dc-dc converters. The package consists of input, modeling, simulation, and interface programs. It captures a converter circuit schematically and then provides steady-state solution, frequency responses, or time-domain waveforms of the converter.
4 citations
07 Jan 1986
4 citations
04 Jan 1986
TL;DR: A new high-accuracy optical linear algebra processor (OLAP) with many advantageous features is described, which achieves floating point accuracy, handles bipolar data by sign-magnitude representation, performs LU decomposition using only one channel, easily partitions and considers data flow.
Abstract: A new high-accuracy optical linear algebra processor (OLAP) with many advantageous features is described. It achieves floating point accuracy, handles bipolar data by sign-magnitude representation, performs LU decomposition using only one channel, easily partitions and considers data flow. A new application (finite element (FE) structural analysis) for OLAPs is introduced and the results of a case study presented. Error sources in encoded OLAPs are addressed for the first time. Their modeling and simulation are discussed and quantitative data are presented. Dominant error sources and the effects of composite error sources are analyzed.
4 citations
01 Jan 1986
TL;DR: The paper presents the translation of a computer communication model into a program, using a process oriented simulation language, ASPOL, and develops models developed using the modified predicate transition nelS that can be automatically translated into simulation programs.
Abstract: The use of modified predicate transition nets for the modeling of computer communication protocols is investigated in this paper. The lower three layers of the OS! architecture are of primary concern. On the Network Layer (Layer 3), fragmentation and reassembly, routing, store and forward buffering and congestion control mechanisms are treared. The Data-Link Layer (Layer 2) leads to window-flow control, time-out retransmission and transmission error recovery models. These mechanisms may repeatedly dealt with in the different layers of the computer communication architecture. Non-prime transitions can be embedded into the modified predicate transition ners hence a top-down modeling is possible. The present paper uses a hierarchical modeling approach to describe complex communication mechanisms in tenns of simpler constructs. Models developed using the modified predicate transition nelS can be automatically translated into simulation programs. The paper presents the translation of a computer communication model into a program, using a process oriented simulation language, ASPOL.
3 citations
30 Jun 1986
TL;DR: For neurophysiologists not normally engaged in modeling and simulation, the subjects are introduced and the virtues of general-purpose workstations for computer-aided-engineering are listed, and the application of such workst stations to neural modeling is pointed out.
Abstract: : For neurophysiologists not normally engaged in modeling and simulation, we introduce the subjects. The availability of low-cost, high performance digital computer systems allows the development of detailed models, and their simulations, which can greatly aid the progress of experimentation. We review the ready-to-use simulation routines on IMSL Ins. libraries. Problems of error analysis in numerical methods are discussed. The virtues of general-purpose workstations for computer-aided-engineering are listed, and the application of such workstations to neural modeling is pointed out. This paper is the first of two. Keywords: Digital simulation; Neural systems; Differential equation; Computer-aided engineeering; and Electrophysiology.
TL;DR: Pasmap is a compact, portable, event-oriented simulation language which allows discrete-event, continuous, and state-event modeling, as well as specialized statistical analysis, which has been developed to facilitate computer simulation on 16-bit microcomputer systems.
TL;DR: A relatively small and inexpensive peripheral array processor is described to be used to identify and characterize sources of water pollution on the basis of measure ments of pollution concentrations downstream from suspected sources and its performance is evaluated.
Abstract: In the modeling of distributed parameter systems, it is sometimes necessary to utilize system observations to identify or estimate the boundary conditions of the field. For example, in dealing with water resources systems, it may be desired to identify and characterize sources of water pollution on the basis of measurements of pollution concentrations downstream from suspected sources. A computational technique based on pattern recognition has been found to be relatively effective in this application. However, the algorithms involved are highly computation-intensive and therefore tend to place a considerable burden on most conventional digital computer facilities. Array processors, though primarily designed for signal processing are playing an increasingly important role in the modeling and simulation of physical systems. It is a purpose of this paper to describe the application of a relatively small and inexpensive peripheral array processor to this problem and to evaluate its performance.
27 Jun 1986
TL;DR: An overview of modeling and simulation of physical processes which produce topographical effects in fabrication of integrated circuits is given in this article, where applications of optical aerial image simulation to lithography and inspection, and linking of layout with process, device and circuit simulation are emphasized.
Abstract: An overview of modeling and simulation of physical processes which produce topographical effects in fabrication of integrated circuits is given. Resist characterization techniques, applications of optical aerial image simulation to lithography and inspection, and linking of layout with process, device, and circuit simulation are emphasized.
18 Aug 1986
TL;DR: In this paper, the authors present the dynamic and digital simulation of the deployment of rigid solar panels on both the Intelsat-V and INSAT-AT spacecraft, and show that the kinematic control rod on the INSAT has a synchronizing function very similar to that of the closed cable loop.
Abstract: This paper presents the dynamic and digital simulation of the deployment of rigid solar panels on INTELSAT-V and INS AT spacecraft. Each spacecraft is characterized by very distinct mechanisms for its solar array deployment. The arrays on INTELSAT-V are in a topological tree configuration, while the INSAT arrays are in a closed-loop configuration because of the four-bar linkage deployment mechanism. It is shown that the kinematic control rod on the INSAT has a synchronizing function very similar to that of the closed cable loop on the INTELSAT-V spacecraft. Practical aspects of the modeling and simulation of complex deployment mechanisms are emphasized. The use and limitations of the DISCOS multibody code for deployment dynamics simulations are discussed, and the need for developing specialized simulation tools emphasized.