BodyCylinderRigid body with cylinder shape. Mass and animation properties are computed from cylinder data and density (12 potential states) 
This information is part of the Modelica Standard Library maintained by the Modelica Association.
Rigid body with cylinder shape. The mass properties of the body (mass, center of mass, inertia tensor) are computed from the cylinder data. Optionally, the cylinder may be hollow. The cylinder shape is by default used in the animation. The two connector frames frame_a and frame_b are always parallel to each other. Example of component animation (note, that the animation may be switched off via parameter animation = false):
A BodyCylinder component has potential states. For details of these states and of the "Advanced" menu parameters, see model MultiBody.Parts.Body.
animation 
Value: true Type: Boolean Description: = true, if animation shall be enabled (show cylinder between frame_a and frame_b) 

r 
Value: Type: Position[3] (m) Description: Vector from frame_a to frame_b, resolved in frame_a 
r_shape 
Value: {0, 0, 0} Type: Position[3] (m) Description: Vector from frame_a to cylinder origin, resolved in frame_a 
lengthDirection 
Value: to_unit1(r  r_shape) Type: Axis Description: Vector in length direction of cylinder, resolved in frame_a 
length 
Value: Modelica.Math.Vectors.length(r  r_shape) Type: Length (m) Description: Length of cylinder 
diameter 
Value: length / world.defaultWidthFraction Type: Distance (m) Description: Diameter of cylinder 
innerDiameter 
Value: 0 Type: Distance (m) Description: Inner diameter of cylinder (0 <= innerDiameter <= Diameter) 
density 
Value: 7700 Type: Density (kg/m³) Description: Density of cylinder (e.g., steel: 7700 .. 7900, wood : 400 .. 800) 
angles_fixed 
Value: false Type: Boolean Description: = true, if angles_start are used as initial values, else as guess values 
angles_start 
Value: {0, 0, 0} Type: Angle[3] (rad) Description: Initial values of angles to rotate frame_a around 'sequence_start' axes into frame_b 
sequence_start 
Value: {1, 2, 3} Type: RotationSequence Description: Sequence of rotations to rotate frame_a into frame_b at initial time 
w_0_fixed 
Value: false Type: Boolean Description: = true, if w_0_start are used as initial values, else as guess values 
w_0_start 
Value: {0, 0, 0} Type: AngularVelocity[3] (rad/s) Description: Initial or guess values of angular velocity of frame_a resolved in world frame 
z_0_fixed 
Value: false Type: Boolean Description: = true, if z_0_start are used as initial values, else as guess values 
z_0_start 
Value: {0, 0, 0} Type: AngularAcceleration[3] (rad/s²) Description: Initial values of angular acceleration z_0 = der(w_0) 
sequence_angleStates 
Value: {1, 2, 3} Type: RotationSequence Description: Sequence of rotations to rotate world frame into frame_a around the 3 angles used as potential states 
radius 
Value: diameter / 2 Type: Distance (m) Description: Radius of cylinder 
innerRadius 
Value: innerDiameter / 2 Type: Distance (m) Description: InnerRadius of cylinder 
mo 
Value: density * pi * length * radius * radius Type: Mass (kg) Description: Mass of cylinder without hole 
mi 
Value: density * pi * length * innerRadius * innerRadius Type: Mass (kg) Description: Mass of hole of cylinder 
I22 
Value: (mo * (length * length + 3 * radius * radius)  mi * (length * length + 3 * innerRadius * innerRadius)) / 12 Type: Inertia (kg·m²) Description: Inertia with respect to axis through center of mass, perpendicular to cylinder axis 
m 
Value: mo  mi Type: Mass (kg) Description: Mass of cylinder 
R 
Value: Frames.from_nxy(r, {0, 1, 0}) Type: Orientation Description: Orientation object from frame_a to frame spanned by cylinder axis and axis perpendicular to cylinder axis 
r_CM 
Value: r_shape + normalizeWithAssert(lengthDirection) * length / 2 Type: Position[3] (m) Description: Position vector from frame_a to center of mass, resolved in frame_a 
I 
Value: Frames.resolveDyade1(R, diagonal({(mo * radius * radius  mi * innerRadius * innerRadius) / 2, I22, I22})) Type: Inertia[3,3] (kg·m²) Description: Inertia tensor of cylinder with respect to center of mass, resolved in frame parallel to frame_a 
color 
Default Value: Modelica.Mechanics.MultiBody.Types.Defaults.BodyColor Type: Color Description: Color of cylinder 

specularCoefficient 
Default Value: world.defaultSpecularCoefficient Type: SpecularCoefficient Description: Reflection of ambient light (= 0: light is completely absorbed) 
R 
Type: Orientation Description: Orientation object from frame_a to frame spanned by cylinder axis and axis perpendicular to cylinder axis 


body 
Type: Body 

frameTranslation 
Type: FixedTranslation 

world 
Type: World 
Modelica.Mechanics.MultiBody.Examples.Elementary Demonstrate usage of ForceAndTorque element 

Modelica.Mechanics.MultiBody.Examples.Loops Model of one cylinder engine 

Modelica.Mechanics.MultiBody.Examples.Loops One kinematic loop with four bars (with only revolute joints; 5 nonlinear equations) 

Modelica.Mechanics.MultiBody.Examples.Loops One kinematic loop with four bars (with UniversalSpherical joint; 1 nonlinear equation) 

Modelica.Mechanics.MultiBody.Examples.Loops One kinematic loop with four bars (with JointSSP joint; analytic solution of nonlinear algebraic loop) 

Modelica.Mechanics.MultiBody.Examples.Rotational3DEffects Demonstrates that a cylindrical body can be replaced by Rotor1D model 

Modelica.Mechanics.MultiBody.Examples.Rotational3DEffects Demonstrate usage of GearConstraint model 
Modelica.Mechanics.MultiBody.Examples.Loops.Utilities Cylinder with rod and crank of a combustion engine 

Modelica.Mechanics.MultiBody.Examples.Loops.Utilities Model of one cylinder engine with gas force 