ea+口 LECTURE 2 Kinematic Fundamentals -Fun with MECHANISMS Covered Cha2-in Design of Machinery 漫 OUTLINE Basic concepts and definitions Configuration of MECHANISMS How does a MECHANISM work? The kinematic diagram DOF-Degree of Freedom A simple equation-Gruebler Criterion Exceptions to Gruebler's Equation Design Catalogue of MECHANISMS ME357 Design Manufacturing ll 1
1 Kinematic Fundamentals -Fun with MECHANISMS LECTURE 2 Covered Cha2- in Design of Machinery ME357 Design & Manufacturing II OUTLINE Basic concepts and definitions Configuration of MECHANISMS How does a MECHANISM work? The kinematic diagram DOF-Degree of Freedom A simple equation-Gruebler Criterion Exceptions to Gruebler’s Equation Design Catalogue of MECHANISMS
Basic concepts and definitions Needle mechanism 到布机构 10 8 8品o Basic concepts and definitions 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a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 2
2 8 5 6 7 8 9 10 12 11 12 10 P 1 4 2 3 1 2 3 Basic concepts and definitions Take-up mechanism 挑线机构 Needle mechanism 刺布机构 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
Configuration of MECHANISMS 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. ©Link,Joints Input Link,Output Link,Frame Input motion Configuration of MECHANISMS 10 3
3 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. Link, Joints Input Link,Output Link,Frame Input motion Configuration of MECHANISMS Configuration of MECHANISMS
How does A MECHANISM work Y移动 x移动“ Z旋转1 地皮中 X旋转 Y旋转 △02 DOF:The number of independent coordinates required to define the systems'position. How does A MECHANISM work Links:individual parts of mechanism.They are considered rigid bodies and are connected with other links to transmit motion and forces. Nodes 0 0 Binary link Ternary link Quatemary link 二副元连杆 三副元连杆 四副元连杆 FIGURE 2-2 Links of different order 4
4 How does A MECHANISM work DOF: The number of independent coordinates required to define the systems’ position. Links: individual parts of mechanism. They are considered rigid bodies and are connected with other links to transmit motion and forces. How does A MECHANISM work 二副元连杆 三副元连杆 四副元连杆
Filler Valve Handle Filler Float -Tank Is the string a LINK? Overflow Tube Flush Valve Bowl Siphon How a Toilet Works Some flexible members,such as a belt or chain,may possess one-way rigidity.Such a member would be considered as a link when in tension but not under compression 5
5 Is the string a LINK? Some flexible members, such as a belt or chain, may possess one-way rigidity. Such a member would be considered as a link when in tension but not under compression