检索结果-内蒙古大学图书馆

A Model Predictive control framework for robust management of multi-product, multi-echelon demand networks

Annual Reviews in control 2003年第2期27 II卷 229-245页

作者： Braun, M.W. Rivera, D.E. Flores, M.E. Carlyle, W.M. Kempf, K.G. Contr. Syst. Engineering Laboratory Department of Chemical Engineering Arizona State University Tempe AZ 85287-6006 United States Department of Industrial Engineering Arizona State University Tempe AZ 85287-5906 United States Decision Technologies Intel Corporation 5000 W. Chandler Blvd. Chandler AZ 85226-3699 United States Texas Instruments Inc. MS 3701 13570 N. Central Expressway Dallas TX 75265 United States Control and Dynamical Systems California Institute of Technology MS 107-81 1200 E. California Blvd. Pasadena CA 91125 United States Operations Research Department Naval Postgraduate School Monterey CA 93943 United States

Model Predictive control (MPC) is presented as a robust, flexible decision framework for dynamically managing inventories and meeting customer requirements in demand networks (a.k.a. supply chains). As a control-oriented framework, an MPC-based planning scheme has the advantage that it can be tuned to provide acceptable performance in the presence of significant uncertainty, forecast error, and constraints on inventory levels, production and shipping capacity. The translation of the supply chain problem into a formulation amenable to MPC implementation is initially developed for a single-product, two-node example. Insights gained from this problem are used to develop a partially decentralized MPC implementation for a six-node, two-product, three-echelon demand network problem developed by Intel Corporation that consists of interconnected assembly/test, warehouse, and retailer entities. Results demonstrating the effectiveness of this Model Predictive control solution under conditions of demand forecast error, constraints on capacity, shipping and release, and discrepancies between actual and reported production throughput times (i.e. plant-model mismatch) are presented. The Intel demand network problem is furthermore used to evaluate the relative merits of various information sharing strategies between controllers in the network. Both the two-node and Intel problems show the potential of Model Predictive control as an integral component of a hierarchical, enterprise-wide planning tool that functions on a real-time basis, supports varying levels of information sharing and centralization/decentralization, and relies on combined feedback-feedforward control action to enhance the performance and robustness of demand networks. These capabilities ultimately mitigate the "bullwhip effect" in the supply chain while reducing safety stocks to profitable levels and improving customer satisfaction. © 2003 Elsevier Ltd. All rights reserved.

关键词： Predictive control systems

来源：评论

学校读者我要写书评

暂无评论

Synchronization in Small-World systems

引用

Physical Review Letters 2002年第5期89卷 054101-054101页

作者： Mauricio Barahona Louis M. Pecora Control and Dynamical Systems California Institute of Technology Pasadena California 91125 Department of Bioengineering Imperial College London SW7 2BX United Kingdom Naval Research Laboratory Code 6340 Washington D.C. 20375

We quantify the dynamical implications of the small-world phenomenon by considering the generic synchronization of oscillator networks of arbitrary topology. The linear stability of the synchronous state is linked to an algebraic condition of the Laplacian matrix of the network. Through numerics and analysis, we show how the addition of random shortcuts translates into improved network synchronizability. Applied to networks of low redundancy, the small-world route produces synchronizability more efficiently than standard deterministic graphs, purely random graphs, and ideal constructive schemes. However, the small-world property does not guarantee synchronizability: the synchronization threshold lies within the boundaries, but linked to the end of the small-world region.

关键词： Quantum theory

来源：评论

学校读者我要写书评

暂无评论

Statistical Theory of Asteroid Escape Rates

引用

Physical Review Letters 2002年第1期89卷 011101-011101页

作者： Charles Jaffé Shane D. Ross Martin W. Lo Jerrold Marsden David Farrelly T. Uzer Control and Dynamical Systems Division 107-81 California Institute of Technology Pasadena California 91125 Navigation and Flight Mechanics Jet Propulsion Laboratory Pasadena California 91109-8099 Department of Chemistry West Virginia University Morgantown West Virginia 26506-6045 Department of Chemistry Utah State University Logan Utah 84322-0300 Center for Nonlinear Sciences and School of Physics Georgia Institute of Technology Atlanta Georgia 30332-0430

Transition states in phase space are identified and shown to regulate the rate of escape of asteroids temporarily captured in circumplanetary orbits. The transition states, similar to those occurring in chemical reaction dynamics, are then used to develop a statistical semianalytical theory for the rate of escape of asteroids temporarily captured by Mars. Theory and numerical simulations are found to agree to better than 1%. These calculations suggest that further development of transition state theory in celestial mechanics, as an alternative to large-scale numerical simulations, will be a fruitful approach to mass transport calculations.

关键词： .numerical simulations rates chemical reaction transition states mass transport orbits chaotic phase space escape celestial mechanics comets Farrelly Uzer circumplanetary Solar System

来源：评论

学校读者我要写书评

暂无评论

The lunar L1 gateway: Portal to the stars and beyond

The lunar L1 gateway: Portal to the stars and beyond

引用

AIAA Space 2001 Conference and Exposition

作者： Lo, Martin Ross, Shane Navigation and Mission Design Section Jet Propulsion Laboratory California Institute of Technology United States Control and Dynamical Systems California Institute of Technology United States

Our Solar System is interconnected by a vast system of tunnels winding around the Sun generated by the Lagrange Points of all the planets and their moons. These passageways are identified by portals around L1 and L2, the halo orbits. By passing through a halo orbit portal, one enters this ancient and colossal labyrinth of the Sun. This natural Interplanetary Superhighway System (IPS, see Figure 1) provides ultra-low energy transport throughout the Earth's Neighborhood, the region between Earth's L1 and L2 This is enabled by a coincidence: the current energy levels of the Earth L1 and L2 Lagrange points differ from that of the Earth-Moon by only about 50 m/s (as measured by AV). The significance of this happy coincidence to the development of space cannot be overstated. For example, this implies that lunar L1 halo orbits are connected to halo orbits around Earth's L1 or L2 via low energy pathways. Many of NASA's future space observatories located around the Earth's L1 or L2 may be built in a lunar L1 orbit and conveyed to the final destination via IPS with minimal propulsion requirements. Similarly, when the spacecraft or instruments require servicing, they may be returned from Earth libration orbits to the Lunar L1 orbit where human servicing may be performed. Since the lunar L1 orbit may be reached from Earth in less than a week, the infrastructure and complexity of long-term space travel is greatly mitigated. The same orbit could reach any point on the surface of the Moon within hours, thus this portal is also a perfect location for the return of human presence on the Moon. The lunar L1 orbit is also an excellent point of departure for interplanetary flight where several lunar and Earth encounters may be added to further reduce the launch cost and open up the launch period. The lunar L1 is a versatile hub for a space transportation system of the future.

关键词： Orbits

来源：评论

学校读者我要写书评

暂无评论

Elevators-autonomous transporters for deepsea benthic sample recovery

Elevators-autonomous transporters for deepsea benthic sample...

引用

OCEANS

作者： M.F. Bowen P.J. Bernard D.E. Gleason L.L. Whitcomb Deep Submergence Laboratory Applied Ocean Physics and Engineering Department Woods Hole Oceanographic Institution Woods Hole MA USA Dynamical Systems and Control Laboratory Department of Mechanical Engineering Johns Hopkins University Baltimore MD USA

Sample recovery devices have been fabricated for use with the Jason deep diving remotely operated vehicle (ROV). They are custom-built, autonomous vertical transporters (AVTs) that are capable of raising numerous benthic samples and other payloads to the ocean's surface independent of the sampling ROV. AVTs are more commonly referred to as sample "elevators". Elevators are inexpensive to construct and can be deployed and recovered many times during the course of a single ROV dive in order to reduce wear and tear on the more expensive ROV. This paper describes the design, fabrication, operation and navigational tracking of these 6,000 meter rated, nondestructive benthic sample transportation vehicles.

关键词： Oceanographic techniques Elevators Remotely operated vehicles Sea surface Sampling methods Navigation Oceans Automotive engineering Payloads Laboratories

来源：评论

学校读者我要写书评

暂无评论

Shoot the moon

Advances in the Astronautical Sciences

引用

Advances in the Astronautical Sciences 2000年 105 II卷 1017-1024页

作者： Koon, Wang Sang Lo, Martin W. Marsden, Jerrold E. Ross, Shane D. Control and Dynamical Systems California Institute of Technology Pasadena CA 91125 United States Navigation and Mission Design Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena CA 91109 United States

In 1991, the Japanese Hiten mission used a low energy transfer with a ballistic capture at the Moon which required less ΔV than a standard Hohmann transfer to the Moon. In this paper, we apply the same dynamical systems techniques used to produce the "Petit Grand Tour" of Jovian moons to reproduce a Hiten-like mission. We decouple the Sun-Earth-Moon-Spacecraft 4-body problem into two 3-body problems. Using the invariant manifold theory of the Lagrange points of the 3-body systems, we are able to construct low energy transfer trajectories from the Earth and ballistic capture trajectories at the Moon. The techniques used in the design and construction of this trajectory may be applied in many situations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The genesis trajectory and heteroclinic connections

Advances in the Astronautical Sciences

引用

Advances in the Astronautical Sciences 2000年第PART III期103卷 2327-2343页

作者： Koon, Wang Sang Lo, Martin W. Marsden, Jerrold E. Ross, Shane D. Control and Dynamical Systems California Institute of Technology Pasadena CA 91125 United States Navigation and Mission Design Jet Propulsion Laboratory MS 301-140L 4800 Oak Grove Drive Pasadena CA 91109-8099 United States

Genesis will be NASA's first robotic sample return mission. The purpose of this mission is to collect solar wind samples for two years in an L1 halo orbit and return them to the Utah Test and Training Range (UTTR) for mid-air retrieval by helicopters. To do this, the Genesis spacecraft makes an excursion into the region around L2. This transfer between L1 and L2 requires no deterministic maneuvers and is provided by the existence of heteroclinic cycles defined below. The Genesis trajectory was designed with the knowledge of the conjectured existence of these heteroclinic cycles. We now have provided the first systematic, semi-analytic construction of such cycles. The heteroclinic cycle provides several interesting applications for future missions. First, it provides a rapid low-energy dynamical channel between L1 and L2 such as used by the Genesis Discovery Mission. Second, it provides a dynamical mechanism for the temporary capture of objects around a planet without propulsion. Third, interactions with the Moon. Here we speak of the interactions of the Sun-Earth Lagrange point dynamics with the Earth-Moon Lagrange point dynamics. We motivate the discussion using Jupiter comet orbits as examples. By studying the natural dynamics of the Solar System, we enhance current and future space mission design.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An optimal control formulation for inviscid incompressible ideal fluid flow

An optimal control formulation for inviscid incompressible i...

引用

IEEE Conference on Decision and control

作者： A.M. Bloch D.D. Holm P.E. Crouch J.E. Marsden Department of Mathematics University of Michigan Ann Arbor MI USA Center for Systems Science and Engineering Arizona State University Tempe AZ USA Mathematical Modeling and Analysis Theoretical Division Los Alamos National Laboratory Los Alamos NM USA Control and Dynamical Systems California Institute of Technology Pasadena CA USA

ISBN: (纸本)0780366387

In this paper we consider the Hamiltonian formulation of the equations of incompressible ideal fluid flow from the point of view of optimal control theory. The equations are compared to the finite symmetric rigid body equations analyzed earlier by the authors. We discuss various aspects of the Hamiltonian structure of the Euler equations and show in particular that the optimal control approach leads to a standard formulation of the Euler equations-the so-called impulse equations in their Lagrangian form. We discuss various other aspects of the Euler equations from a pedagogical point of view. We show that the Hamiltonian in the maximum principle is given by the pairing of the Eulerian impulse density with the velocity. We provide a comparative discussion of the flow equations in their Eulerian and Lagrangian form and describe how these forms occur naturally in the context of optimal control. We demonstrate that the extremal equations corresponding to the optimal control problem for the flow have a natural canonical symplectic structure.

关键词： Optimal control Fluid flow Poisson equations Lagrangian functions Mathematics Mathematical model US Department of Energy systems engineering and theory control systems Angular velocity

来源：评论

学校读者我要写书评

暂无评论

Optimal control for Halo Orbit Missions

引用

IFAC Proceedings Volumes 2000年第2期33卷 1-6页

作者： Radu Serban Wang Sang Koon Martin Lo Jerrold E. Marsden Linda R. Petzold Shane D. Ross Roby S. Wilson Department of Mechanical and Environmental Engineering University of California Santa Barbara CA 93106. Navigation and Flight Mechanics Jet Propulsion Laboratory M/S: 301-140L 4800 Oak Grove Drive Pasadena CA 91109. Control and Dynamical Systems California Institute of Technology 107-81 Pasadena CA 91125

This paper addresses the computation of the required trajectory correction maneuvers (TCM) for a halo orbit space mission to compensate for the launch velocity errors introduced by inaccuracies of the launch vehicle. By combining dynamical systems theory with optimal control techniques, we produce a portrait of the complex landscape of the trajectory design space. This approach enables parametric studies not available to mission designers a few years ago, such as how the magnitude of the errors and the timing of the first TCM affect the correction Δ V . The impetus for combining dynamical systems theory and optimal control in this problem arises from design issues for the Genesis Discovery mission being developed for NASA by the Jet Propulsion laboratory.

关键词： Optimal control Mission design dynamical systems

来源：评论

学校读者我要写书评

暂无评论

The use of vibration data for liquid rocket health monitoring 34th

The use of vibration data for liquid rocket health monitorin...

引用

34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998

作者： Lozano, Paulo Ho, Nhut Martinez-Sanchez, Manuel Mangoubi, Rami Department of Aeronautics and Astronautics Massachusetts Institute of Technology CambridgeMA United States Department of Mechanical Engineering M.I.T. and Control and Dynamical Systems Division C.S. Draper Laboratory Cambridge United States Control and Dynamical Systems Division C.S. Draper Laboratory Cambridge United States

An approach is presented to the construction of a liquid rocket Health Monitoring (HM) system capable of using both, vibratory and thermodynamic data. Preliminary results are obtained in the area of vibration data tracking/identification, using as a test bed a low-order linear dynamic model of the Space Shuttle Main Engine (SSME) High Pressure Fuel Turbopump (HPFTP). Limitations and future extensions are discussed. © 1998 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Space shuttles

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：