Kinematic & Dynamics Midterm I

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Stuff specifically from the review he mentioned might be on the exam.

78 Terms

1

Kinematics

The study of motion without considering forces

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2

Kinetics

The study of motion with forces and torques considered

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3

Synthesis

The process of designing mechanisms to achieve a desired motion

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4

Analysis

Examining a mechanism’s motion, forces, and performance

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5

Mechanism

A system of rigid bodies designed to produce motion

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6

Design

The process of creating mechanisms to meet functional requirements

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7

Iteration

Repeating the design process to improve a mechanism

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8

Research

Systematic investigation to develop new knowledge or designs

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9

Benchmarking

Comparing designs against standards or competitors

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10

Mobility

The ability of a mechanism to move, determined by degrees of freedom

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11

Degrees of Freedom

The number of independent movements a mechanism has

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12

Pure rotation

Motion where all points of a body move in circular paths around a fixed axis

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13

Pure translation

Motion where all points of a body move in parallel straight lines

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14

Complex motion

A combination of rotation and translation in a mechanismC

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15

Circuit

A set of positions a mechanism can reach without disassembly

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16

Branch

A range of motion within a circuit where the mechanism remains functional

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17

Circuit defect

When it needs to be disassembled to reach a position

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18

Branch defect

Needs a circuit change to reach a position

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19

Binary link

A link connected to two other links

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20

Ternary link

A link connected to three other links

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21

Quaternary link

A link connected to four other links

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22

Joint

A connection between two links that allows relative motion

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23

Kinematic pair

Two links connected by a joint that permits specific motion

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24

Half Joint

A joint that removes only half a degree of freedom, such as a rolling contact

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25

Form-closed joint

A joint held together by its shape, like a pin in a hole

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26

Force-closed joint

A joint held together by external forces, like a cam and follower

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27

Crank

A link that rotates continuously

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28

Rocker

A link that oscillates back and forth

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29

Coupler

A link connected the input and output links, transferring motion

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30

Dyad

A two-link group with joints used in mechanism synthesis

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31

Structure

A rigid assembly of links with no mobility (0 DOF)

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32

Preloaded structure

A structure with internal forces to eliminate play or backlash (-1 DOF)

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Paradox

A mechanism behavior that contradicts expected motion principles

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34

Isomer

Different mechanisms with the same linkage topology but different motion

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35

Cartesian

A coordinate system ysing (x,y,z) axes for positioning

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36

Polar

A coordinate system using radius and angle to define a position

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37

Displacement

The change in position of a point or body

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38

Inversion

A different configuration of a mechanism by fixing a different link

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39

Slider-crank

A four-bar linkage with rotating crank and sliding link

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40

Rotatability

The ability of a link to complete full rotation in a mechanism

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41

Spring (Flexible link)

A deformable link that stores and releases energy

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42

Compliant linkage

A mechanism that achieves motion through elastic deformation instead of rigid joints

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43

Function Generation

Designing a mechanism to control an output based on an input

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Path generation

Designing a mechanism to make a point follow a specific path

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45

Motion generation

Designing a mechanism to guide a body through specific positions

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46

Toggle positions (Extreme movements)

Positions where a linkage locks due to collinear links (TDC & BDC)

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Transmission angle

The angle between the output link and the force being transmitted, affecting efficiency

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48

Position synthesis

Determining link lengths to achieve specific positions

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49

Coupler curves

The path traces by a couple point in a four-bar mechanism

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50

Cusp

A sharp point on a coupler curve where velocity momentarily stops

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51

Crunode

A self-intersecting point on a coupler curve

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52

Cognate

A different four-bar linkage that produces the same coupler curve

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53

Intertial reference frame

A coordinate system where Newton’s laws hold without external acceleration

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54

CAD

Computer Aided Design

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55

FEM

Finite Element Method

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56

FEA

Finite element analysis

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57

SI

Systemes Internationale

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58

GFBM

Geared five bar mechanism

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59

MEMS

Micro-electromechanism systems

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60

BR

Bearing Ratio

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61

DC

Direct Current, used for small portable applications

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62

AC

Alternating current, Household applications

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63

TDC

Top dead center

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BDC

Bottom dead center

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PM

Permanent Magnet

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66

LNCS

Local nonrotating coordinate system

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67

LRCS

Local rotating coordinate system

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68

DOF

Degrees of freedom

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69

James Watt

Grandfather of kinematics

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70

Euler

( Equation / Theorem ) General displacement of a rigid body with one point fixed is a rotation about an axis

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71

Rober Willis

Mechanism synthesis

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72

Alexander Kennedy

Translated Franz Reuleaux’s famous kinematic text

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73

Archimedes

Eureka - Applied geometry to the study of the lever

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74

Gruebler

Equation of Mobility

M=3L-2J-3G

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75

Grashof

Condition equation for Rotatability

S+L<=P+Q

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76

Geneva

Mechanism - Intermittent motion

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77

Roberts

Straight line - Triple rocker

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78

Chasles’

Theorem - Displacement of a rigid body is equivalent to the sum of translation of any one point on that body and a rotation of the body about an axis through the point

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