Plastic injection mould cooling system design by the configuration space method

The cooling system of an injection mould is very important to the productivity of the injection moulding process and the quality of the moulded part. Despite the various research efforts that have been directed towards the analysis, optimization, and fabrication of cooling systems, support for the layout design of the cooling system has not been well developed. In the layout design phase, a major concern is the feasibility of building the cooling system inside the mould insert without interfering with the other mould components. This paper reports a configuration space (C-space) method to address this important issue. While a high-dimensional C-space is generally required to deal with a complex system such as a cooling system, the special characteristics of cooling system design are exploited in the present study, and special techniques that allow C-space computation and storage in three-dimensional or lower dimension are developed. This new method is an improvement on the heuristic method developed previously by the authors, because the C-space representation enables an automatic layout design system to conduct a more systematic search among all of the feasible designs. A simple genetic algorithm is implemented and integrated with the C-space representation to automatically generate candidate layout designs. Design examples generated by the genetic algorithm are given to demonstrate the feasibility of the method.     

The design of a new remote manipulator for space operation using a 4-cable-driven thrusters-embedded configuration

A new remote manipulator based on cable-driven parallel mechanism (CDPM) is designed for space long-distance operations (e.g. space capture/docking and other long-distance space activities) in this paper. By controlling the cables and thrusters which are equipped on the manipulator simultaneously, the new remote manipulator can achieve expected position, linear velocity, and angular velocity. The new manipulator has a larger controllable workspace compared with usual CDPMs. The structure and characteristics of this manipulator are discussed in this paper. The volume and characteristics of the workspace are also discussed. The influence of the distance on the static equilibrium is studied. The simulation results show that the workspace of this new manipulator is larger than usual CDPM’s. The results also indicate that the cable forces and thruster vectors can completely constrain the manipulator and meet the requirements of space activities. The results of the simulation also show that the controllable workspace of the manipulator is not continuous at some regions. Hence, trajectory planning is necessary.     

Design space optimization using design space adjustment and refinement

To deal with large-scale problems that often occur in industry, the authors propose design space optimization with design space adjustment and refinement. In topology optimization, a design space is specified by the number of design variables, and their layout or configuration. The proposed procedure has two efficient algorithms for adjusting and refining design space. First, the design space can be adjusted in terms of design space expansion and reduction. This capability is evolutionary because the design domain expands or reduces wherever necessary. Second, the design space can be refined uniformly or selectively wherever and whenever necessary, ensuring a target resolution with fewer elements, especially for selective refinement. Accordingly, the proposed procedure can handle large-scale problems by solving a sequence of smaller problems. Two examples show the efficiency of the proposed approach.     

Graph products for configuration processing of space structures

In this paper four undirected graph products and four directed graph products are presented for the formation of structural models. The undirected products are extensively used in graph theory and combinatorial optimization, however, the directed products defined in this paper are more suitable for the formation of practical structural models. Here, the directed and undirected products are employed for the configuration processing of space structures. This application can easily be extended to the formation of finite element models.     

Combinatorial optimization in system configuration design

The significance of systems configurations has been increased in many applied domains (e.g., software, hardware, manufacturing systems, communication systems, supply chain systems, solving strategies, modular planning, material engineering and combinatorial chemistry). Generally, the following kinds of systems under configuration (reconfiguration) can be examined: (a) initial data/infomation (or row materials); (b) processing systems (machines, computers, algorithms); (c) resultant decisions (e.g., products, plans); (d) applied support systems (e.g., network systems, services); (e) requirements; and (f) standards. In the paper several system configuration problems are investigated: (i) searching for (selection of) a set (structure) of system components, (ii) searching for a set of compatible system components, (iii) allocation of system components, (iv) reconfiguration of a system as redesign of the system structure, (v) multi-stage design and redesign of system configuration, (vi) design or redesign of the system configuration for multi-product systems, and (vii) design of system hierarchy. Combinatorial optimization models (including multicriteria statements) are under examination: multiple choice problem, allocation problem, graph coloring problems, morphological clique problem (with compatibility of system components), multipartite clique and their modifications, spanning trees problems.     

公共元数据配置管理平台设计

随着互联网快速发展,各平台利用元数据来组织和管理平台数据资源,平台内平台具有封闭性使得元数据资源分散、反复存储,增大元数据共享难度,降低元数据利用率。为解决这一问题,提出公共元数据配置管理平台,将公共元数据统一配置管理,利用Web Service技术提供配置与共享元数据服务,采用Redis内存数据库提高数据共享效率。目前,已在气象大数据平台中运用了基于气象公共元数据的配置管理平台,其不仅提高了平台公共元数据的利用率、节约存储,也提高了服务的响应速度。同时,将配置管理平台的主要功能抽象,使平台设计可适用于其他类似的基于元数据的数据共享平台。     

Real-Time Collision-Free Path Planning for Robots in Configuration Space

Collision-free path planning for an industrial robot in configuration space requires mapping obstacles from robot‘s workspace into its configuration space.In this paper,an approach to real-time collision-free path planning for robots in configuration space is presented.Obstacle mapping is carried out by fundamental obstacles defined in the workspace and their images in the configuration space.In order to avoid dealing with unimportant parts of the configuration space that do not affect searching a collision-free path between starting and goal configurations,we construct a free subspace by slice configuration obstacles.In this free subspace,the collision-free path is determined by the A^* algorithm.Finally,graphical simulations show the effectiveness of the proposed approach.     

Exascale design space exploration and co-design

The co-design of architectures and algorithms has been postulated as a strategy for achieving Exascale computing in this decade. Exascale design space exploration is prohibitively expensive, at least partially due to the size and complexity of scientific applications of interest. Application codes can contain millions of lines and involve many libraries. Mini-applications, which attempt to capture some key performance issues, can potentially reduce the order of the exploration by a factor of a thousand. However, we need to carefully understand how representative mini-applications are of the full application code. This paper describes a methodology for this comparison and applies it to a particularly challenging mini-application. A multi-faceted methodology for design space exploration is also described that includes measurements on advanced architecture testbeds, experiments that use supercomputers and system software to emulate future hardware, and hardware/software co-simulation tools to predict the behavior of applications on hardware that does not yet exist.     

Concurrent optimal design of modular robotic configuration

This paper presents a new optimization design methodology that is applicable to modular systems. This new methodology is called concurrent optimization design method (CODM). A modular robot is taken as a case study. The CODM is superior to the existing methods for modular robot configuration design in the sense that traditional type synthesis and dimensional synthesis now can be treated once. This mathematically implies that (i) variables are defined for both types and dimensions, and (ii) all the variables are defined in one optimization problem formulation. This paper illustrates that, in fact, optimization design for modular architectures necessitates a multiobjective optimization problem. A genetic algorithm is used to solve for this complex optimization model which contains both discrete and continuous variables. © 2001 John Wiley & Sons, Inc.     

FPGA芯片内部可重构配置系统设计

设计了可以配置单个逻辑阵列的FPGA芯片内部配置系统结构,提出了可重构配置的电路结构。在现有FPGA芯片结构的基础上,设计了可以根据实际需要有针对性地调整配置操作的系统以及相关的通信协议,使得调试开发过程中的操作时间尽可能缩短。     

Extended object model for product configuration design

This paper presents an extended object model for case-based reasoning (CBR) in product configuration design. In the extended object model, a few methods of knowledge expression are adopted, such as constraints, rules, objects, etc. On the basis of extended object model, case representation model for CBR is applied to product configuration design system. The product configuration knowledge can be represented by the extended object. The model can support all the processes of CBR in product configuration design, such as case representation, indexing, retrieving, and case revising. The presented model is an extension of the traditional object-oriented model by including the relationship class used to express the relation between the cases, constraints class used in the product configuration knowledge representation, index class used in case retrieving, and solution class used in case revising. Therefore, the product configuration knowledge used in the product configuration design can be represented by using this model. In the end, a metering pump product configuration design system is developed on the basis of the proposed product configuration model to support customized products.     

DIDS: rapidly prototyping configuration design systems

The domain independent design system (DIDS) provides a set of tools for rapidly constructing new configuration design systems from a library of reusable software elements called mechanisms. A DIDS user begins by creating a model of the problem domain and the task to be automated. This includes describing a library of parts from which new artifacts could be configured, optimization and preference criteria, and functionality constraints. DIDS analyzes this input and automatically builds an operational prototype system by selecting and combining mechanisms. DIDS' ability to automate this process is derived from its model of configuration design, which enables reusable mechanisms to be identified and automatically selected based on a problem's characteristics. The use of DIDS is illustrated by showing how DIDS solved an elevator-configuration problem.     

路由器配置诊断及优化系统研究与设计

路由器的配置错误在查找和定位上一直是诊断的难点,并且配置命令的无关联性也通常是造成配置出错的原因.路由器配置诊断系统能对配置命令分类找出其相关性,诊断并优化路由器配置.系统利用决策树算法生成配置命令的决策树,并从中提取有价值的配置命令的分类信息和规则,形成配置命令知识库.分析原有的配置文件,提取配置种类,利用知识库改进路由器的配置和诊断方法.系统简化了网络管理员的大部分的工作,将配置的错误率减到最低,并降低资源的消耗.     

工控组态软件对外集成方式的研究与设计

介绍了组态软件对外集成的几种方式，以及Windows提供的支持这几种方式的DDE、OPC、ActiveX自动化等几种标准，通过这几种方式，可以实现程序间数据交换，方便对外集成，并在实际工程中应用涉及到的主要技术，取得了良好的效果。     

Exploring the Processing-in-Memory design space

With the emergence of 3D-DRAM, Processing-in-Memory has once more become of great interest to the research community and industry. Here we present our observations on a subset of the PIM design space. We show how the architectural choices for PIM core frequency and cache sizes will affect the overall power consumption and energy efficiency. We include a detailed power consumption breakdown for an ARM-like core as a PIM core. We show the maximum possible number of PIM cores we can place in the logic layer with respect to a predefined power budget. Additionally, we catalog additional sources of power consumption in a system with PIM such as 3D-DRAM link power and discuss the possible power reduction techniques. We describe the shortcomings of using ARM-like cores for PIM and discuss other alternatives for the PIM cores. Finally, we explore the optimal design choices for the number of cores as a function of performance, utilization, and energy efficiency.