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Questions and Answers
What is the main objective of Kinematics?
What is the main objective of Kinematics?
- To create mechanisms to transmit significant power
- To study the forces on systems in motion
- To transform motion to some desirable pattern
- To mathematically compute positions, velocities, and accelerations of the subject parts (correct)
What is the main function of a Mechanism?
What is the main function of a Mechanism?
- To study the forces on systems in motion
- To develop very low forces and transmit little power (correct)
- To contain mechanisms designed to provide significant forces and transmit significant power
- To create or design the desired motions of the subject parts
What is the primary characteristic of a Machine?
What is the primary characteristic of a Machine?
- To mathematically compute positions, velocities, and accelerations of the subject parts
- To contain mechanisms designed to provide significant forces and transmit significant power (correct)
- To study the forces on systems in motion
- To create mechanisms to transmit significant power
DOF is the number of dependent parameters
(measurements) which are needed to define its position
in space at any instant of time
DOF is the number of dependent parameters (measurements) which are needed to define its position in space at any instant of time
Maximum no . of DOF in 3D space
Maximum no . of DOF in 3D space
Name the 3 types of Motion
Name the 3 types of Motion
____ is the basic building block of mechanisms.
____ is the basic building block of mechanisms.
Joints with Surface Contact= Higher Pair
Joints with Surface Contact= Higher Pair
Joints with Point or Line Contact = Higher pair
Joints with Point or Line Contact = Higher pair
Match the six lower pairs with their number corresponding DOF.
Match the six lower pairs with their number corresponding DOF.
Coupler is a link that has
oscillatory (back and forth) rotation and is pivoted to ground
Coupler is a link that has oscillatory (back and forth) rotation and is pivoted to ground
Crank is a link that makes a complete
revolution and is pivoted to ground.
Crank is a link that makes a complete revolution and is pivoted to ground.
Rocker is a link that has oscillatory (back and forth) rotation and is pivoted to ground.
Rocker is a link that has oscillatory (back and forth) rotation and is pivoted to ground.
_____ is any link or link that are fixed (nonmoving) with respect to the reference frame.
_____ is any link or link that are fixed (nonmoving) with respect to the reference frame.
Intermittent motion is a sequence of motions and dwells.
Intermittent motion is a sequence of motions and dwells.
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Study Notes
Kinematics
- Main objective is to describe motion without considering forces.
- Focuses on the relationship between displacements, velocities, and accelerations of bodies.
Mechanisms
- The primary function is to transfer motion and force between components.
- Mechanisms convert input motion into desired output motion.
Machines
- Characterized by the ability to do work by using mechanisms to transform energy from one form to another.
- Generally include a series of interconnected parts to achieve specific tasks.
Degrees of Freedom (DOF)
- Defined as the number of independent parameters required to define an object's position in space at any time.
- In 3D space, the maximum number of DOF is six (three translational and three rotational).
Types of Motion
- The three types of motion include translation, rotation, and oscillation.
Mechanism Building Blocks
- The basic building block of mechanisms is the link.
Joints in Mechanisms
- Joints with Surface Contact are classified as Higher Pairs.
- Joints with Point or Line Contact are classified as Higher Pairs.
Lower Pairs and DOF
- Each of the six lower pairs is matched to its corresponding number of DOF, typically one for each simple joint.
Coupler
- A link that undergoes oscillatory rotation and is pivoted to a fixed base.
Crank
- A link that rotates completely (360 degrees) around a pivot point.
Rocker
- A link that exhibits oscillatory motion and is also pivoted to ground.
Fixed Links
- Any link that remains stationary with respect to the reference frame is identified as a fixed link.
Intermittent Motion
- Describes a motion characterized by a sequence of movements followed by pauses, creating a cyclical pattern.
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