Synopsis

SYNOPSIS Of Proposed thesis work entitled “Modeling and simulation of various products of Mahaveer Electromechanical Works Pvt. Ltd, M.I.D.C. Akola by using parametric modeling package ” Carried out by Mr. Dipak V. Shirbhate For submission of

M.E. (Production Technology and Management) Under the Guidance of Prof. D.S. Ingole

Department of Production Engineering College of Engineering, Badnera In the faculty of Engineering & Technology, Amravati University, Amravati 2003-2004 “Modeling and simulation of various products of Mahaveer Electrmechanical Works Pvt. Ltd, M.I.D.C. Akola by using parametric modeling package ”

SYNOPSIS Keywords: parametric modeling, simulation

PARAMETRIC MODELING CONCEPTS Parametric modeling is an approach to computer-aided design that gained prominence in the late 1980s. An assumption commonly held among CAD users is that similar modeling techniques exist for all CAD systems. To users that follow this assumption, the key to learning a different CAD system is to adapt to similar CAD commands. This is not entirely true when a two-dimensional CAD user tries to learn, for the first time, a parametric modeling application. Within parametric modeling systems, though, you can find a command that resemble 2D CAD commands. Often, these commands are used in a parametric modeling system just as they would be used in a 2D CAD package. Parametric modeling presents a different approach to CAD, especially when compared to 2D drafting and Boolean based 3D modeling. Oftentimes an experienced CAD user will have trouble learning a parametric modeling package. This is especially true when a user tries to approach 3D parametric modeling as he or she would approach Boolean solid modeling. They use similar concepts, but the approaches are different. FEATURE-BASED MODELING Parametric modeling systems are often referred to as feature-based modelers. In a parametric modeling environment, parts are composed of features (Fig. 1-4). Features may comprise either positive space or negative space. Positive space features are composed of actual mass. An example of a positive space feature is an extruded boss. A negative space feature is where a part has a segment cut away or subtracted. An example of a negative space feature is a hole. Parametric modeling systems such as Pro/ENGINEER incorporate an intuitive way of constructing features. Often, the feature is first sketched in two dimensions and then either extruded, revolved, or swept to form the three-dimensional object. When sketching the feature, design intent is developed in the model by adding dimensions and constraining the sketch. Features can be predefined or sketched. Examples of predefined features include holes, rounds, and chamfers. Many parametric modeling packages incorporate advanced

ways of modeling holes. Within a parametric modeling package, predefined holes can be simple, counter bored, countersunk, or drilled. Parametric modeling package hole command allows users the opportunity to sketch unique hole profiles, such as may be required for a counter bore. Sketched features are created by sketching a section that incorporates design intent. Sections may be extruded, revolved, or swept to add positive or negative space features.

Compared to Boolean modeling, feature-based modeling is a more intuitive approach. In Boolean modeling, a common way to construct a hole is to model a solid cylinder and then subtract it from the parent feature. In a parametric design environment, a user can simply place the hole by using a predefined hole command or by cutting a circle through the part. With most Boolean-based modelers, if the user has to change a parameter of the hole, such as location or size, he or she has to plug the original hole, then subtract a second solid cylinder. To adjust a feature-based hole, the user can change any parameter associated with the hole by modifying a dimension or parameter. Similarly, a feature's sketch can be redefined or modified.

CONCURRENT ENGINEERING AND PARAMETRIC MODELLING The engineering design process once was linear and decentralized. Modem engineering philosophies are integrating team approaches into the design of products. As shown in Figure

Team members can come from a variety of fields. Teaming stimulates a nonlinear approach to design, with the CAD model the central means of communicating design intent. Concurrent engineering has many advantages over the traditional design process. Individuals and groups invest significant resources and time into the development of products. Each individual and group has needs that must be met by the final design solution. As an example, a service technician wants a product that is easy to maintain while the marketing department wants a design that is easy to sell. Concurrent engineering allows, everyone with an interest in the design to provide their input. Modem engineering and communication technologies allow designs to be shared easily among team members. CAD three-dimensional models graphically display designs that can be interpreted by individuals who are not trained in blueprint-reading fundamentals. Because of this accessibility, the CAD system has become the heart of many product-data-management systems. Internet capabilities allow designs to be shared over long distances. Most CAD applications have Internet tools that facilitate the sharing of design data. Parametric Technology Corporation's Pro/Web-Publish, for one, allows for the publishing of CAD data over the Internet. Another example is PTC's Pro/Fly-

Through application, which displays Virtual-Reality-Modeling-Language (VRML) models and allows for the markup and animation of these models over an Internet or intranet. Following products will be selected for modeling and simulation MAHAVIR D-Series Destoner MAHAVIR G-Series Gravity Separator MAHAVIR A-Series Air Classifier MAHAVIR W - Series Weigher The project study gives an opportunity to enhance parametric modeling as well as simulation skills. CONTENTS INTRODUCTION LITERATURE SURVEY CASE STUDY RESULTS AND DISCUSSION BIBIOGRAPHY References: 1. Pro/Engineer instructor: By David S. Kelley 2. Teach Yourself VRML 2 in 21 days. By: Chris Marrin Bruce Campbell 3. www.ptc.com

Signature of Guide

Signature of Student