Counter-Rotating Planetary Gear - MapleSim Help

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Counter-Rotating Planetary Gear

Counter-Rotating Planetary Gear component

               

 

The Counter-Rotating Planetary Gear is based on the Planetary Gear component (see Planetary Gear). It has a set of two meshing planet gears on a single carrier where the first planet meshes with the sun gear and the second planet meshes with the ring gear. Three gear ratios must be provided: Ring/Planet(1), Planet(2)/Sun, and Planet(2)/Planet(1). This component is modeled using two Planet Planet Gears and one Planet Ring Gear as shown in the diagram below.

 

 

Internal Structure

 

 

 

 

Internal Settings

Component

PPG1

PPG2

PRG1

rP1/S , rR/P2, rP2/P1

rO/I  = rP1/S

rO/I  = rP2/P1

rR/P  = rR/P2

ideal=true

ideal=true

ideal=true

ideal=true

ideal=false

same loss data=true

 

ηω, d

ideal=false

ηωI/C = ηω

 

d = d

ideal=false

ηωI/C = ηω 

 

d = 0

ideal=false

ηωR/C = ηω

 

d = d

ideal=false

same loss data= false

ηP1/SωS/C, ηR/P2ωR/C, ηP2/P1ωP1/C, dP1/C, dP2/C

ideal=false

ηωI/C =  ηP1/SωS/C

 

d = dP1/C

ideal=false

ηωI/C =  ηP2/P1ωP1/C

 

d = 0

ideal=false

ηωR/C =  ηR/P2ωR/C

 

d = dP2/C

   

Connections 

Name

Condition

Description

ID

Carrier

Carrier flange

carrier

Planet1

planet port=true

Planet1 flange

planet1

Planet2

planet port=true

Planet2 flange

planet2

Ring

Ring flange

ring

Sun

Sun flange

sun

Loss Power

ideal=false

Conditional real output port for power loss

lossPower

 

Parameters

Symbol

Condition

Default

Units

Description

ID

ideal

-

true

-

Defines whether the component is:

true - ideal or

false - non-ideal

ideal

data source

ideal=false

GUI

-

Defines the source for the loss data:

• 

entered via GUI [GUI]

• 

by an attachment [attachment]

• 

by an external file [file]        

datasourcemode

same loss data

ideal=false

true

-

Defines whether one efficiency data table is used for all meshing loss calculations [same loss data=true] or the efficiency of each meshing gear pair is given by a separate data table [same loss data=false].

SameMeshingEfficiency

rP1/S

-

1

-

Planet 1/Sun Gear ratio

ratio1

rR/P2

4

Ring/Planet2 Gear ratio

ratio2

rP2/P1

1

Planet2/Planet1 Gear ratio

ratio3

npl

ideal=false

1

Number of planet pair gears

A planet pair consists of a set of Planet 1 and Planet 2 gears

numberofPlanets

ηω

ideal=false

 

same loss data = true 

 

data source = GUI

  0,1,1 

rads,,

Defines all velocity dependant meshing efficiencies.

The columns:

[ω     (η1 (ω )     η2 (ω )]

Five options are available:

• 

1 by 1 array:

Entered value is taken as the constant efficiency for forward and backward cases

η1 (ω ) = η2 (ω ) = η

• 

1 by 2 array:

First entered value is taken as the constant efficiency for forward case and the second for backward cases

η1 (ω) = η1 , η2 (ω ) = η2

• 

1 by 3 array:

First column is ignored and the second and third values are taken as constant efficiencies for forward and backward cases, respectively

• 

 n by 2 array:

2nd column is forward and backward efficiency

η (ω) = η1 (ω ) = η2(ω )

• 

n by 3 array:

2nd column is forward efficiency

η1 (ω)

3rd column is backward efficiency

η2 (ω )

meshinglossTable4

ideal=false

 

same loss data = true 

 

data source = attachment

- 

 

 

 

 

 

 

 

Defines velocity dependant meshing efficiency

First column is angular velocity (ω)

(See col η below)

data4

ideal=false

 

same loss data = true 

 

data source = file 

- 

fileName4

col η

ideal=false

 

same loss data = true

 

data source = attachment or file

 

  2,3

 

-

Defines the corresponding data columns used for forward efficiency (η1) and backward efficiency (η2 )

Two options are available:

• 

1 by 1 array:

Data column corresponding to the column number is used for both forward and backward efficiency η=η1 = η2 

• 

1 by 2 array:

Data column corresponding to the first column number is used for forward efficiency ( η1) 

and data column corresponding to the second column number is used for backward efficiency ( η2)

columns4

ηR/P2ωR/C

ideal=false

 

same loss data = false 

 

data source = GUI

  0,1,1 

rads,, 

Defines Ring/Planet2 velocity dependant meshing efficiency as a function of ωR/C .

The columns are:

[ωR/C     (η1(ωR/C )     η2(ωR/C )]

First column is angular velocity of the ring gear w.r.t. the carrier (ωR/C)

Five options are available:

• 

1 by 1 array:

Entered value is taken as the constant efficiency for forward and backward cases

η1(ωR/C ) = η2ωR/C = η

• 

1 by 2 array:

First entered value is taken as the constant efficiency for forward case and the second for backward cases

η1(ωR/C ) = η1 , η2(ωR/C ) = η2

• 

1 by 3 array:

First column is ignored and the second and third values are taken as constant efficiencies for forward and backward cases, respectively.

• 

 n by 2 array:

Second column is forward and backward efficiency

η (ωR/C ) = η1 (ωR/C ) = η2 (ωR/C )

• 

n by 3 array:

Second column is forward efficiency

η1 (ωR/C )

Third column is backward efficiency

η2 (ωR/C )

meshinglossTable2

ideal=false

 

same loss data = false 

 

data source = attachment

- 

 

 

 

 

 

 

 

Defines the velocity dependent meshing efficiency

First column is angular velocity (ωR/C )

(See col ηR/P2 below)

data2

ideal=false

 

same loss data = false 

 

data source = file

-

fileName2

col ηR/P2

ideal=false

 

same loss data = false 

 

data source = attachment or file

  2,3

-

Defines the corresponding data columns used for forward efficiency (η1) and backward efficiency (η2)

Two options are available:

• 

1 by 1 array:

Data column corresponding to the column number is used for both forward and backward efficiency η1=η2 = η 

• 

1 by 2 array:

Data column corresponding to the first column number is used for forward efficiency (η1) and

data column corresponding to the second column number is used for backward efficiency (η2)

columns2

ηP1/SωS/C

ideal=false

 

same loss data = false 

 

data source = GUI

  0,1,1 

rads,, 

Defines Planet1/Sun velocity dependant meshing efficiency as a function of ωS/C .

The columns are:

[ωS/C     (η1(ωS/C )     η2(ωS/C )]

First column is angular velocity of the sun gear w.r.t. carrier (ωS/C)

Five options are available:

• 

1 by 1 array:

Entered value is taken as the constant efficiency for forward and backward cases

η1(ωS/C ) = η2ωS/C = η

• 

1 by 2 array:

First entered value is taken as the constant efficiency for forward case and the second for backward cases

η1(ωS/C ) = η1 , η2(ωS/C ) = η2

• 

1 by 3 array:

First column is ignored and the second and third values are taken as constant efficiencies for forward and backward cases, respectively

• 

 n by 2 array:

Second column is forward and backward efficiency

η (ωS/C ) = η1 (ωS/C ) = η2 (ωS/C )

• 

n by 3 array:

Second column is forward efficiency

η1 (ωS/C )

Third column is backward efficiency

η2 (ωS/C )

meshinglossTable1

ideal=false

 

same loss data = false 

 

data source = attachment

-   

 

 

 

 

 

Defines the velocity dependent meshing efficiency

First column is angular velocity (ωS/C )

(See col ηP1/S below)

data1

ideal=false

 

same loss data = false 

 

data source = file

-

fileName1

col ηP1/S

ideal=false

 

same loss data = false 

 

data source = attachment or file

  2,3

-

Defines the corresponding data columns used for forward (η1) and backward (η2) efficiency

Two options are available:

• 

1 by 1 array:

Data column corresponding to the column number is used for both forward and backward efficiency (η1=η2 = η) 

• 

1 by 2 array:

Data column corresponding to the first column number is used for forward efficiency (η1) and

data column corresponding to the second column number is used for backward efficiency (η2)

columns1

ηP2/P1/ωP1/C

ideal=false

 

same loss data = false 

 

data source = GUI

  0,1,1 

rads,, 

Defines Planet2/Planet1 velocity dependant meshing efficiency as a function of ωP1/C .

The columns are:

[ωP1/C     (η1(ωP1/C )     η2(ωP1/C )]

First column is angular velocity of the sun gear w.r.t. carrier (ωP1/C)

Five options are available:

• 

1 by 1 array:

Entered value is taken as the constant efficiency for forward and backward cases

η1(ωP1/C ) = η2ωP1/C = η

• 

1 by 2 array:

First entered value is taken as the constant efficiency for forward case and the second for backward cases

η1(ωP1/C ) = η1 , η2(ωP1/C ) = η2

• 

1 by 3 array:

First column is ignored and the second and third values are taken as constant efficiencies for forward and backward cases, respectively

• 

 n by 2 array:

Second column is forward and backward efficiency

η (ωP1/C ) = η1 (ωP1/C ) = η2 (ωP1/C )

• 

n by 3 array:

Second column is forward efficiency

η1 (ωP1/C )

Third column is backward efficiency

η2 (ωP1/C )

meshinglossTable3

ideal=false

 

same loss data = false 

 

data source = attachment

- 

 

 

 

 

 

 

 

Defines the velocity dependent meshing efficiency

First column is angular velocity (ωP1/C )

(See col ηP2/P1 below)

data3

ideal=false

 

same loss data = false 

 

data source = file

-

fileName3

col ηP2/P1

ideal=false

 

same loss data = false 

 

data source = attachment or file

  2,3

-

Defines the corresponding data columns used for forward (η1) and backward (η2) efficiency

Two options are available:

• 

1 by 1 array:

Data column corresponding to the column number is used for both forward and backward efficiency (η1=η2 = η) 

• 

1 by 2 array:

Data column corresponding to the first column number is used for forward efficiency (η1) and

data column corresponding to the second column number is used for backward efficiency (η2)

columns3

dP1/C

ideal=false

same loss data = false 

0

Nmrads

Linear damping in planet1/carrier bearings

d1

dP2/C

ideal=false

same loss data = false

0

Nmrads

Linear damping in planet2/carrier bearings

d2

d

ideal=false

same loss data = true 

0

Nmrads

Linear damping in planet/carrier bearing

d4

smoothness

ideal=false

Table points are linearly interpolated

-

Defines the smoothness of table interpolation

There are two options:

• 

Table points are linearly interpolated

• 

Table points are interpolated such that the first derivative is continuous

smoothness

See Also

MapleSim Driveline Library Overview

MapleSim Library Overview

1-D Mechanical Overview

Planetary Gear Sets

Dual Ratio Planetary Gear

Planet Planet Gear

Planet Ring Gear

Planetary Gear

 

 

 


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