© 2001 by CRC Press LLCBottom Heating Closed-Loop Control and Interfacing — The bottom heater unit is altered to control the heating process.. This is done by separating the main power s
Trang 1© 2001 by CRC Press LLC
Bottom Heating Closed-Loop Control and Interfacing — The bottom heater unit is altered to
control the heating process This is done by separating the main power supply from the air fan and heat resistant unit so the heat resistant unit can be switched on/off by the bottom controller’s relay depending
on the thermal demand while the air fan is operated constantly during the bottom heating (see Figure 6.30b )
FIGURE 6.29 Interfacing between SM and TH rework devices to the corresponding signal lines at the I/O module
FIGURE 6.30 (a) Interfacing and control diagram of closed loop control of IR heating and (b) The bottom heater
Trang 2© 2001 by CRC Press LLC
7
Model of Conceptual Design Phase and Its Applications in the Design of Mechanical
Drive Units 7.1 Introduction
Design as a Process of Conceptual Design of Products Leading
to Manufacturing Design — Duhovnik’s Perspective
• Iterativeness of the Design Process — Supplementing
of Information • Levels of Design
7.2 Model of Conceptual Design
Expressions Required to Understand the Model • Basic Function Structure • Attribute Vector • Rules for Binding Models of Shape • Flexible Function (Model) Structure
• Synthesis of a Design Model
7.3 Implementation of the Model
Formal Record of Certain Crucial Rules
7.4 Assessment of Appropriateness of Working Principles and Models of Shape
Analytic Hierarchy Process
7.5 Application
Inclusion and Exclusion of Criteria
7.6 Assessment of a CAD System for the Conceptual Design of Mechanical Drive Units
Assessment of the Conceptual Design Model • Assessment
of the AHP Method
7.7 How Should We Continue?
7.8 Conclusions
7.1 Introduction
Engineering design is a series of activities necessary for finding a satisfactory solution to a given task Solutions are embodied in the resulting technical systems A satisfactory solution is a solution that performs a given task within a certain time limit, with a certain reliability, for certain (production and operating) costs [1–3], and with a certain environmental impact.
Roman avbi
University of Ljubljana
Jo e Duhovnik
University of Ljubljana
ˇZ ˇz