290012_trn_2007_cg_cma

7/25/2019 290012_TRN_2007_CG_CMA

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Image courtesy of National Optical AstronomyObservatory, operated by the Association of Universitiesfor Research in Astronomy, under cooperative agreement with the National Science Foundation

!OS"OS"otion Advanced #raining

!OS"OS"otion $%%&

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2' $%%& Solid(or)s !orp !onfidential

About this course

*rere+uisites

!ourse esign *hilosophy

Using this boo)

A note about files

!onventions used in this boo)

!lass Introductions

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-esson .

!A" Synthesis

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-esson ./ #opics

Use spline function data to control the displacement of a

follower 0oint

!reate a trace path of a point to get the !A" profile

"odify the Solid(or)s part with this !A" *rofile

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-esson ./ Spline ata

Spline fitting functions 1 A)ima spline 2A3IS*-4

Fast

"ore data points for accuracy

1 !ubic spline 2!U5S*-4

ata points need not be evenly spaced

Spline data files

1 6 #7# or 6!S8 file format

1 "inimum of 9 data points

1 File should contain one data point per line

1 #he data point consists of two values, thetime and the value at that time

1 !ommas or spaces can be used asseparators between the values

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-esson ./ Results 1 #race *ath

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-esson $

Suspension Steering System

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-esson $/ #opics

-earn about Fle:ible connectors or 5ushings

!reate Advanced *lots

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-esson $/ "echanism Summary

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-esson $/ Results

Toe angle vs. Spindle_Height

Straight

Left Turn

ight Turn

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-esson $/ 5ushings

5ushings 1 efines a force acting in all three directions ;ou can also

define a torsional force for the bushing,

1 Allows constraints, such as rigid 0oints to be replaced by aforce<based ob0ect

1 !sotropi" #ushings Use this option if you have uniform translational or torsional

properties

1 $rthotropi" #ushings

Specify different properties in different directions For e:ample,

a bushing mount for a suspension arm will have differentproperties in the =<a:is, than in the :<a:is and y<a:is

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-esson $/ Results with 5ushings

Toe angle vs. Spindle_Height

Straight

Left Turn

ight Turn

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-esson >

!onveyor 5elt

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-esson > #opics

Automatically map advanced Solid(or)s !A"mates

!reate Action<Reaction forces

Understand the concept of mar)ers

!reate functions based on mar)ers

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-esson >/ "ar)ers 2-ocal !oordinate Systems4

(hat Are "ar)ers?

1 "ar)ers are coordinate frames to define the attachmentlocation and orientation for a motion entity on a part

Used in the definition of constraints and forces

Results are typically computed at mar)ers

!an be used to measure specific a result duringsolve for function e:pressions 2eg relative velocity,displacement, force4

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A @oint has a mar)er on each

part it connects #he mar)er onthe first part is considered the Imar)er, and the second is the @mar)er

#he 0oint defines the position of

the I mar)er relative to the @mar)er eg An a:is is aligned, the origins

for the $ mar)ers are coincident

In !OS"OS "otion, I and @"ar)ers are initially aligned andat the same location for 0oints 2iethe model starts assembled4

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"ar)ers are not typically

needed by the standard userOnly re+uired when/ 1 !reating advanced function

e:pressions where the userneeds to measure information

about the mechanism 2resultdependant functions4

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-esson >/ Results

&or"e '(pression) 10*+10,- +//%//8

Translational -elo"it of

3onveor elt

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-esson 9

Surgi"al Shear

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-esson 9 #opics

•Simulate and control the cutting force of the surgicalshear blade using e:pressions and mar)ers

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-esson 9/ Results

3utting &or"e '(pression

!&+-+899090)!&++899090)0.0.!&+0./9/,+899090)0.0.,1*++899090,0./9/0.0.

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-esson

edundan"ies

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-esson #opics

-earn about Redundancies and how they affect thesimulation results

Use Fle:ible 0oints to automatically remove redundancies in amechanism

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-esson / (hat are redundancies?

Redundancies are important as they effect the force

distribution in the mechanism Occur when there are more un)nowns than there are

e+uations to solveBg Simply Supported beam

B+uations/ Sum of Forces in y<direction

Sum of Forces in :<directionSum of "oments about =<direction

9 Un)nowns/

Fy A

F: A

Fy!

Fy5,

:

y A 5

A!

5

> Un)nowns/

Fy A

F: A

Fy5,

No Redundancies

. Redundancies:

y

> B+uations

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(hen you have a redundant constraint, you have two or

more 0oints effectively fighting to control a degree offreedom

In simple cases, the solver automatically removesconstraint e+uations to stop the redundancies

In comple: situations, the solver may not remove thecorrect redundancy Simulations still run, but may givedifferent motion or force distribution to that e:pected

-esson / Solver and Redundancies

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Solver chec)s the mechanism contains redundancies and

will try to remove them #here is a certain logic by which redundancies are

removed #he solver will remove redundancies based on

the following order/

Rotational !onstraint

#ranslational !onstraint

"otion Inputs


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(hat this means/ 1 Solver loo)s for rotational constraints it can remove to eliminate redundancies

1 If it cannot find any rotation constraints to remove, it will then try to removetranslational constraints

1 If it cannot removed any translational constraints, it will try to remove an inputmotion 2as a last resort4

If all these attempts fail, the solver will abort with amessage stating to chec) for redundant or inconsistentconstraints in the mechanism 2or to see if it is in a loc)edposition4


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Option to treat all 0oints as fle:ible

connectors One step process to eliminate

redundancies

-esson / Fle:ible @oints

#ypical oor hinged at more than

one location to share the weight of

the door

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Image courtesy of National Optical Astronomy

Observatory, operated by the Association of Universitiesfor Research in Astronomy, under cooperative agreement with the National Science Foundation

-esson C

rive Shaft

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-esson C #opics

!reate an Action Only "oment

B:port the forceDmoment loads on a part to !OS"OS(or)s

Run the structural analysis in !OS"OS(or)s and view results

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&'7 '(port

1 B:port force and moment results to!OS"OS(or)s to study the structuralresponse 2stresses and deflections4 of thatcomponent

1 A force at a general > location in space is

not supported -oads should be distributedover surfaces and not edges

1 efine the load bearing surface at the timeyou create a !OS"OS"otion entity

1 If not specified, loads are distributed on thegeometry used in the definition of theSolid(or)s mates #his is true only formapped 0oints from Solid(or)s mates

-esson C/ -oad 5earing Faces

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Image courtesy of National Optical Astronomy

Observatory, operated by the Association of Universitiesfor Research in Astronomy, under cooperative agreement with the National Science Foundation

-esson &

nai" alan"ing

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//' $%%& Solid(or)s !orp !onfidential

-esson & #opics

Understand force imbalances and dynamic balancing applications

Bvaluate the force imbalance in a piston cran)shaft mechanismand use !OS"OS"otion results to improve performance of thissystem

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-esson &/ B:ample 1 (ashing "achine

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-esson &/ *iston !ran)shaft "echanism

#o balance the mechanism as closely as possible, we need to have aforce that acts in an opposite direction to the inertiaDmomentum forcesbeing transmitted by the connecting rod to the cran)shaft

!an only minimi=e the imbalance but cannot eliminate the imbalance

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-esson &/ !ounterweight esigns

esign the counterweight to )eep the imbalance between the

forces a minimumIf the counterweight is too small, then there will be a high forcefrom the connecting rod

If the counterweight is too large, then there will be a high forcefrom the counterweight 2!ran)Earm4

#he two )ey methods are offset and thic)ness #he range of offsetis typically restricted by installation issues

Focus on thic)ness of counterweights

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-esson &/ Results

agnitude of the rea"tion for"e on

the earing_!nline oint.

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/8

-esson &/ Results

earing load as a fun"tion of the "ran:_ar ;idth

+"ounter;eight thi":ness

!f the "ran:_ar ;idth < 1/ then the oentu of the piston and

"onne"ting rod is larger than that of the "ran: ar.

!f the "ran:_ar ;idth = 1/ the oentu of the "ran: ar is

higher.

&or"e i#alan"e is inial for a "ran:_ar ;idth of 1/ .

290012_trn_2007_cg_cma

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