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Kinematics > Definitions > Flashcards

Definitions Flashcards

1
Q

Mechanical system mobility

A

Degrees of freedom

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2
Q

3 translational motions

A

X, y, z

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3
Q

Only angular orientation changes

A

Pure rotation

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4
Q

All points on the body follow parallel paths

A

Pure translation

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5
Q

Combination of rotation and translation

A

Complex motion

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6
Q

Link with two nodes

A

Binary

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7
Q

Link with three nodes

A

Ternary

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8
Q

Link with four links

A

Quarternary

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9
Q

Connection between two or more links at their nodes (KINEMATIC PAIRS) that allows motion between connected links

A

Joints

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10
Q

Joint with surface contact

A

Lower pair

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11
Q

Joints with point or line contact

A

Higher pair

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12
Q

6 basic mechanical components

A

Link, wheel, cam, screw, ratchet, belt

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13
Q

5 types of relative motion

A

Rolling, sliding, linkages, wrapping, connectors, tackle

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14
Q

6 types of Lower Points

A

Revolute, Prismatic, Helical, Cylindric, Spehrical, Planar

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15
Q

Sliding motion along the axis

A

Prismatic or Slider Pairs

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16
Q

Purely rotational motion along joined axis

A

Revolute

17
Q

LP (lower pair) 1 DOF

A

Prismatic, Helical and Revolute

18
Q

LP 2 DOF

A

Cylindric

19
Q

LP 3 DOF

A

Spherical and Planar

20
Q

2 DOF HP (higher pair) joints have 2 motions happening at the same time

A

Half joint

21
Q

Joint require external force to keep together

A

Force closed joint

22
Q

Joint is kept together by its build (geometry)

A

Form closed joint

23
Q

Mechanism used to open and close valves

A

Cam follower

24
Q

How many links does it take to create 1 joint?

A

2

25
Q

Assemble of links and joints connected to produce output motion from input motion

A

Kinematic chain

26
Q

Kneimatic chain with one link grounded or attached to frame

A

Mechanism

27
Q

Machine

A

Collection of mechanisms arranged to do work and and transmit forces

28
Q

A link makes complete revolution and pivoted to the ground.

A

Crank

29
Q

A link that goes back and forth rotation and pivoted to the ground

A

Rocker

30
Q

A link that has complex motion (rotation and translational) and is NOT pivoted to the ground

A

Coupler

31
Q

Link between joints that allows relative motion between links

A

Kinematic links

32
Q

Open kinematic chain of 2 binary links and 1 joint

A

Dyad

33
Q

Any link in a plane 3 DOF

A

Gruebler condition

34
Q

Connecting 2 unconnected links reduces the DOF by how many? What will be the final DOF?

A

2, 6

35
Q

Connecting 2 unconnected links by a half joint, how much does it reduce the DOF? How much is the final DOF?

A

1,5

36
Q

M=3(L-1)-2J-J2

A

Kutzback’s equation

Kinematics (2 decks)

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