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ME 470 Quiz 1
| Question | Answer |
|---|---|
| mechanical systems are classified by what? | their mobility (M) or degrees of freedom (DOF) |
| what are DOF's? | number of independent parameters needed to uniquely define their positions in space at any instant with respect to a selected frame of reference |
| a rigid body in a place has how many DOF's? | 3 DOF's: 2 lengths and 1 angle |
| a rigid boy in 3D space had how many DOF's? | 6 DOF's: 3 lengths and 3 angles |
| kinematic bodies are _______ & _________ | rigid & massless |
| a rigid body = a __________ ________ | kinematic link |
| what are the three types of motion? | translation, rotation, complex |
| for translation what remains unchanged? | its angular orientation |
| translation, rotation, or complex? linear position of a body changes with respect to a fixed frame | trasnlation |
| translation, rotation, or complex? angular orientation of a body changes about a fixed frame of refrence | rotation |
| for rotation which position remains fixed? | linear position |
| what is complex motion? | simultaneous combination of translation and rotation motions |
| what is this? assemblage of links & joints, interconnected in a way to provide controlled output motion in response to supplied motion | kinematic chain |
| what is this? kinematic chain where at least one link has been grounded or attached to a frame of refrence | mechanism |
| what is this? collection of mechanisms arranged to transmit forces and do work | machine |
| what are linkages? | basic building blocks for all mechanisms made up of links and joints |
| what is a link? | rigid body possessing at least 2 nodes |
| what are nodes? | points for attachment to other links |
| what are joints? | connection between 2 or more links |
| what are the three types of links? | binary, ternary, quaternary |
| what is a binary link? | a link with 2 nodes |
| what is a ternary link? | a link with 3 nodes |
| what is a quaternary link? | a link with 4 nodes |
| what are joints? | connections between 2 or more links at their nodes |
| joint allow for a __________ motion between the connected links | contained |
| joints are also known as what? | kinematic pairs |
| you can classify joints by the number of __________ allowed at the joint. | DOF's |
| you can classify joints by type of contact between _________ | elements (point, lines, surfaces) |
| you can classify joints by the type of physical _________ of joint | closure |
| you can classify joints by the number of ________ joined at the joint | links |
| how many degrees of freedom does a full joint have? | 1 DOF |
| what are examples of full joints? | rotating pin or translating slider |
| how many degrees of freedom does a half joint have? | 2 DOF's |
| what are examples of half joints? | roll-slide joint |
| the order a full joint is one _________ than the number of links joined | less than |
| if DOF is greater than or equal to one than it is a ___________ | mechanism |
| if DOF is equal to 0 then its a _________ | structure |
| if DOF is equal to -1 then its a ______________ | preloaded structure |
| what is the Grueber condition? | any link in a plane has 3 DOF's |
| for a full joint (lower pair) the contact happens where? | over the surface |
| full joints allow ________ DOF(s) and remove ________ DOF(s) | allows 1 DOF, removed 2 DOF's |
| for a full joint (lower pair) the contact happens where? | over a line or point |
| half joints allow ________ DOF(s) and remove ________ DOF(s) | allows 2 DOF's, removes 1 DOF |
| 3 links on one pin --> ________ revolute joints | two |
| what is this? any link(s) that are fixed (non-moving) with respect to reference frame | ground |
| what is this? link which makes complete revolution and is pivoted to ground? | crank |
| what is this? link which has oscillatory (back & forth) rotation and is pivoted to ground | rocker |
| what is this? connecting rod which has complex motion and is not pivoted to ground | coupler |
| any full joint can be replaced by a half joint but this will __________ DOF by one | increase |
| removal of a link will ___________ DOF by one | reduce |
| 4-bars have a __________ DOF mobility | single |
| the linkage is Grashof if: | at least one link will be capable of a complete revolution relative to any other link |
| type one Grashof examples are: | crank-rocker, double crank, Grashof double-rocker |
| type two Grashof examples are: | only double rockers |
| for position analysis what approach do we use? | Vector Loop |
Created by:
mccurdyo