Theory of Machines: Unit I: Kinematics of Mechanisms

mechanism

Mechanism Vs Machine

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A mechanism is defined as a closed kinematic chain in which any one link is fixed.

MECHANISM

• A mechanism is defined as a closed kinematic chain in which any one link is fixed.

• The mechanism should have a constrained motion. If all links of a kinematic chain are free, the motion will be unconstrained. When one link is fixed, it becomes mechanism.

• If different links of a kinematic chain are fixed, the result is a different mechanism.

• The primary function of a mechanism is transmit and modify motion.

1. Mechanism Vs Machine

• A machine is a mechanism or a collection of mechanisms which transmits both motion and forces.

• The mechanism is a device to transmit and modify motion. If the device also transmits forces, in addition to motion, then the mechanism is called as machine.

• It may be noted that all machines are mechanisms, but all mechanisms are not machines.

• The difference between mechanism and machine is presented in Table 1.3.

Table 1.3. Mechanism Vs Machine

Theory of Machines: Unit I: Kinematics of Mechanisms : Tag: : Mechanism Vs Machine - mechanism

Home | Department: Mech Department | Subject: Theory of Machines |

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Theory of Machines: Unit I: Kinematics of Mechanisms

Kinematics of Mechanisms - Introduction, about mechanics of machines

Branches of mechanics of machines - Illustration

fundamental concepts - Kinematics of Mechanisms - Theory of Machines

Mechanisms and Machines: Basic Concepts - Learning Objectives, Introduction

kinematic link (or element) - Kinematics of Mechanisms - Theory of Machines

Structure - Kinematics of Mechanisms - Theory of Machines

constrained motions - Kinematics of Mechanisms - Theory of Machines

kinematic pair - Kinematics of Mechanisms - Theory of Machines

kinematic chain - Kinematics of Mechanisms - Theory of Machines

Types of joints in a chain - Kinematics of Mechanisms - Theory of Machines

mechanism - Mechanism Vs Machine

Degrees of freedom (or mobility) of a mechanism - Kinematics of Mechanisms - Theory of Machines

Inversion of mechanisms - Types of Kinematic Chain

four-bar chain (or quadratic cycle chain)

Grashof's law - Kinematics of Mechanisms - Theory of Machines

inversions of four-bar chain - Kinematics of Mechanisms - Theory of Machines

single slider-crank chain - Kinematics of Mechanisms - Theory of Machines

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double slider-crank chain - Kinematics of Mechanisms - Theory of Machines

inversions of double slider-crank chain - Kinematics of Mechanisms - Theory of Machines

Review and summary - Kinematics of Mechanisms - Theory of Machines

Review Questions - Kinematics of Mechanisms - Theory of Machines

Velocity and Acceleration in Mechanisms - Learning Objectives, Introduction

methods of kinematic analysis - Kinematics of Mechanisms - Theory of Machines

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