ea+口 LECTURE 1 Introduction to Design Covered: cha1 in Mechanical Engineering Design in Design of Machinery 1日gs OUTLINE The world of MACHINES MECHANISMS Basic concepts and definitions What is ENGINEERING DESIGN? Standards and Codes ©Units Some examples of ancient and modern machines ME357 Design Manufacturing ll 1
1 Introduction to Design LECTURE 1 Covered : cha1 in Mechanical Engineering Design in Design of Machinery ME357 Design & Manufacturing II OUTLINE The world of MACHINES & MECHANISMS Basic concepts and definitions What is ENGINEERING DESIGN? Standards and Codes Units Some examples of ancient and modern machines
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2 ME357 Design & Manufacturing II The world of MECHANISMS The world of MECHANISMS
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3 The world of MECHANISMS
五 Humanoid head ®r3E 有“机”者，事竟成！ Basic concepts and definitions ME357 Design Manufacturing ll 4
4 有“机”者，事竟成！ Humanoid head ME357 Design & Manufacturing II Basic concepts and definitions What is a MACHINE?? -from 3 idiots
Basic concepts and definitions ⑧Machine(机器)：a combination of resistant bodies arranged to compel the mechanical forces of nature to do work accompanied by determinate motion.(-Reuleaux) Machines are mechanical devices used to alter, transmit and direct forces to accomplish a specific objective,(to do work,to achieve some certain application functions. ME357 Design Manufacturing ll 登时代：人是机器的奴隶 5
5 ME357 Design & Manufacturing II Machine（机器）: a combination of resistant bodies arranged to compel the mechanical forces of nature to do work accompanied by determinate motion.(- Reuleaux) Machines are mechanical devices used to alter, transmit and direct forces to accomplish a specific objective, (to do work, to achieve some certain application functions. ) Basic concepts and definitions 摩登时代：人是机器的奴隶？
Basic concepts and definitions ⑧Mechanism(机构)：a kinematic chain in which at lease one link has been"grounded",or attached,to the frame of reference(which itself may be in motion);the links in the kinematic chain move upon each other with definite relative motion. ©Kinematic Chain(运动链)：an assembly of links and joints.(Interconnected in a way to provide a controlled output motion in response to a supplied input motion.)? ME357 Design Manufacturing ll Basic concepts and definitions he Transmission sys Control system ower system ←用习 Executive Augxiliary system 6
6 ME357 Design & Manufacturing II Mechanism（机构）: a kinematic chain in which at lease one link has been “grounded”, or attached, to the frame of reference(which itself may be in motion); the links in the kinematic chain move upon each other with definite relative motion. Kinematic Chain（运动链）: an assembly of links and joints. (Interconnected in a way to provide a controlled output motion in response to a supplied input motion.) ? Basic concepts and definitions Basic concepts and definitions Power system Transmission system Control system Executive system Augxiliary system
Basic concepts and definitions 1 what is the relationship 8见 between the piston and the crank? 2 What are the synchronizations and control requirements and how will they be met? 540 180 3 how much heat will be generated and how will the engine be cooled? 4 what materials and manufacturing methods will 360 be used? 5 what will be the cost,both for initial purchase and continued operation and maintenances? Basic concepts and definitions ·Intake stroke Compression stroke ·Combustion stroke ·Exhaust stroke ①Exha intake port K Spark Plug Echaust Por Engine Block G oll Pan Rod Bearing Oll Sump Crankshaft ①INTAKE ②C0 MPRESSION COMBUSTION G EXHAUST Spark ●Top Dead Conter 7
7 Basic concepts and definitions 1 what is the relationship between the piston and the crank? 2 What are the synchronizations and control requirements and how will they be met? 3 how much heat will be generated and how will the engine be cooled? 4 what materials and manufacturing methods will be used? 5 what will be the cost, both for initial purchase and continued operation and maintenances? Basic concepts and definitions
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8 Basic concepts and definitions 8 5 6 7 8 9 10 12 11 12 10 P 1 4 2 3 1 2 3 Basic concepts and definitions
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9 ME357 Design & Manufacturing II Kinematic pairs
What is Engineering Design? ©A generic view: (Uni-directional iterative among multiple points) Synthesis nalysis. Synthesis Analysis X3 X1 Y3 Y1 The Design Space The Performance Space (Sets of design parameters X (Sets of performance parameters Y and their specification ranges) and their requirement ranges) Successful solution of design problems will require engineer to develop a combination of skills in both synthesis and analysis. ME357 Design Manufacturing ll The Inner Environment- Engine Bodv Electronics The Goals/Purposes- Safety Costs Pleasure Performance Etc The Outer Environment- Road Conditions Traffic Situations Market Competitions Environmental Regulations I UO>P Etc. ME357 Design Manufacturing ll 10
10 ME357 Design & Manufacturing II What is Engineering Design? A generic view: Y3 X2 X1 X3 Y2 Y1 The Design Space (Sets of design parameters X and their specification ranges) The Performance Space (Sets of performance parameters Y and their requirement ranges) Synthesis Analysis Synthesis Analysis (Uni-directional iterative among multiple points) Successful solution of design problems will require engineer to develop a combination of skills in both synthesis and analysis. ME357 Design & Manufacturing II The Goals/Purposes – Safety Costs Pleasure Performance Etc. The Inner Environment – Engine Powertrain Chaise and Suspension Body Electronics The Outer Environment – Road Conditions Traffic Situations Market Competitions Environmental Regulations Etc. I U O > P