32.3.2. Piston Liner Connector

A piston liner connector is defined with two bodies. This entity is created between a cylinder (an engine block) and a piston.

Figure 32.142 Piston Liner Connector

32.3.2.1. Modeling Options

1. Click the Liner icon of the Crank Connector group in the Crank tab. The user can see the Crank Component Liner Connector - Line Connector dialog box.

2. The user can choose the following types in Component Type and select the position where the constraint bearing is created in Component Index.

   • Constraint

   • Cylinder Contact

   • Surface Contact

     

     Figure 32.143 Crank Component Liner Connector - Liner Connector dialog box

3. Click OK.

32.3.2.2. Properties

The user can create the two kinds of liner connectors.

• The first one is translational joint.

• The other is contact liner connector (Cylinder or Surface contact).

32.3.2.2.1. Constraint Type of Liner connector

Figure 32.144 Liner Connector property page [Translational Joint]

• Please refer to Type of Friction in below.

  • Standard Friction

  1. Select Friction Coefficient in the combo box.

  2. Click More and then values to define Coulomb friction. For more information, click here.

     

     Figure 32.145 Coulomb Friction dialog box

  • Empirical Formula

  1. Select Empirical Formula in the combo box.

  2. Click More and enter the values to define Empirical Formula Friction. For more information, click here.

     

     Figure 32.146 Empirical Formula Friction dialog box

32.3.2.2.2. Cylinder Contact Type of Liner Connector

Figure 32.147 Liner Connector property page [Cylinder In Cylinder Contact]

• Output Reference Frame: The user can choose another desired Reference Marker.

• Contact Output File: If it is checked, the user can get specific output information file such as:

  Table 32.2 Contact Output File Contents

  	Variables	Descriptions
  1	Time(sec)	Simulation Time
  2	amount of contact point	Total number of calculated contact points
  3	Pos_TX of Base Body CM	Position X of Center Marker for Base Body from Global
  4	Pos_TY of Base Body CM	Position Y of Center Marker for Base Body from Global
  5	Pos_TZ of Base Body CM	Position Z of Center Marker for Base Body from Global
  6	Pos_PSI of Base Body CM	Position of Center Marker for Base Body in 3-1-3 Euler angle from Global
  7	Pos_THETA of Base Body CM	Position of Center Marker for Base Body in 3-1-3 Euler angle from Global
  8	Pos_PHI of Base Body CM	Position of Center Marker for Base Body in 3-1-3 Euler angle from Global
  9	Pos_TX of Action Body CM	Position X of Center Marker for Action Body from Global
  10	Pos_TY of Action Body CM	Position Y of Center Marker for Action Body from Global
  11	Pos_TZ of Action Body CM	Position Z of Center Marker for Action Body from Global
  12	Pos_PSI of Action Body CM	Position z-axis of Center Marker for Action Body in 3-1-3 Euler angle from Global
  13	Pos_THETA of Action Body CM	Position x-axis angle of Center Marker for Action Body in 3-1-3 Euler angle from Global
  14	Pos_PHI of Action Body CM	Position z-axis of Center Marker for Action Body in 3-1-3 Euler angle from Global
  15	Global contact position	Position of Contact Points from Global
  16	Contact position based on Base Body	Position of Contact Points from Base Body
  17	Contact position based on Action Body	Position of Contact Points from Action Body
  18	Contact force based on Action Body	Contact Force from Action Body
  19	Friction force based on Action Body	Friction Force from Action Body

The user can see the output file in your working folder where your model is in. The output file name is Filename_ContactElementName.out.

• Radial Clearance: Defines as a gap between the cylinder and piston.

  

  Figure 32.148 Definition of Clearance

  

  Figure 32.149 Contact Characteristic dialog box [Cylinder In Cylinder Contact]

• Please refer to Type of Friction in below.

  • Standard Friction

  1. Select Friction Coefficient in the combo box.

  2. Click More and then values to define Coulomb Friction. For more information, click here.

     

     Figure 32.150 Friction Definition dialog box

  • Empirical Formula (Refer to Constraint Bearing)

  1. Select Empirical formula in the combo box.

  2. Click More and enter the values to define Empirical Formula Friction. For more information, click here.

     

     Figure 32.151 Empirical Formula Friction dialog box

32.3.2.2.3. Surface Contact Type of Liner Connector

Figure 32.152 Liner Connector property page [Surface To Surface Contact]

• Output Reference Frame: The user can choose another desired Reference Marker.

• Contact Output File: If it is checked, the user can get specific output information file. For more information, click here.

  

  Figure 32.153 Properties of Surface Contact liner connector

• Preview Contact Surface: The user can see the preview of defined contact surfaces. These surfaces are decided by Define Contact Profile on Piston and Define Cylinder Profile on Engine Block.

  

  Figure 32.154 Preview Contact Surface

  

  Figure 32.155 Liner Connector property page [Surface To Surface Contact]

• Please refer to Type of Friction in below.

  • Standard Friction (refer to Bushing Bearing)

  1. Select Friction Coefficient in combo box.

  2. Click More and then values to define Coulomb Friction. For more information, click here.

     

     Figure 32.156 Friction Definition dialog box

  • Empirical Formula (refer to Bushing Bearing)

  1. Select Empirical formula in combo box.

  2. Click More and enter the values to define Empirical Formula Friction. For more information, click here.

     

     Figure 32.157 Empirical Formula Friction dialog box