Design tool

About: Design tool is a research topic. Over the lifetime, 3864 publications have been published within this topic receiving 46401 citations.

A transformer-like model for the DC/AC converter

Abstract: The paper proposes a two-port model of the inverter leg as building block to simulate the various topologies of switched-mode DC/AC converters, overcoming the problems encountered with the usual switch-diode simulation approach while retaining the interaction between the AC and DC sides The model has a simple transformer-like formulation, easy to implement in any circuit simulation environment, and allows the lossless behavior, the conduction losses and the switching losses to be separately modeled Using the same set of few parameters, it can be implemented in three different versions, from the most general to the simplest one, to be selected according to the application and to the accuracy requirements A simplified expression for the load of the DC source is also derived allowing ready determination of DC operating point that is crucial to the efficiency of non-conventional power sources As design tool, the proposed model has proved to be accurate and effective in predicting the behavior of a system, as can be seen from the application example reported in the paper, and it is very useful to dimension the power devices heatsink In research and education areas, it also help to give physical insight into the converter operation and design criteria

Cooling load design tool for UFAD systems.

Abstract: This paper presents a new spreadsheet-based cooling load design tool for underfloor air distribution (UFAD) systems developed by the Center for the Built Environment at University of California, Berkeley. After briefly reviewing previous UFAD design tools, the main characteristics of the tool are described: transformation of the zone design cooling load calculated for a standard overhead (OH) mixing system into the design cooling load for a stratified UFAD system, splits of the total UFAD cooling load into three fractions, supply plenum (SPF), zone, or room, (ZF), and return plenum (RPF); prediction of the thermal comfort in a vertically stratified environment, air temperature profiles and setpoint temperature at the thermostat; modeling of air diffusers; prediction of the design airflow rate; and modelling of commonly used plenum configurations. A practical example is reported at the end of the paper. The design tool and detailed user notes are available at: .

Next Generation QFD: Decision-Based Product Attribute Function Deployment

Abstract: The critical product planning phase, early in the product development cycle, requires a design tool to set engineering priorities, capable of selecting the preferred design concept and setting target levels of engineering performance to guide the later product development stages, while considering the needs of both the consumer and producer. The Quality Function Deployment (QFD) method was developed to transfer customer needs into engineering characteristics; however, limitations have been identified in using QFD, which can result in irrational and unrealistic results when used to set engineering priorities and target levels of product performance. In this paper, based on the principles of Decision-Based Design (DBD), a new design tool called the Product Attribute Function Deployment (PAFD) is demonstrated as a decision-theoretic, enterprise-wide process tool to guide the conceptual design phase. The PAFD method extends the qualitative matrix principles of QFD while utilizing the quantitative decision making processes of DBD to create a new process specifically for translating qualitative customer needs into quantitative engineering attributes and making early product design decisions. It is built upon established methods in engineering, marketing, and decision analysis to eliminate the need for subjective user ratings. In addition, the technical attributes considered are expanded beyond those typically considered to include requirements from the producer and regulators. The differences between QFD and PAFD are compared and the conceptual design of an automotive Manifold Absolute Pressure sensor is used to demonstrate the benefits of the PAFD method.

Program Design With Abstract Data Types

Abstract: : This paper explores the use of abstract data types as a modularization and structuring technique in the design of programs, particularly larger programs including compilers and operating systems. The concepts of type and type definition are discussed. Some data structuring mechanisms are generalized and several simple examples are presented. The examples increase in complexity and conclude with the design of a directory system, illustrating the power of data types as a design tool.