Internal Package with partial classes, static models, and other building blocks for library development
	BooleanConstantVariability Generate constant signal of type Boolean
	SpoolE An electrical spool with second-order characteristics
	SpoolE2Windings An electrical spool with second-order characteristics
	SpoolEInverted An electrical spool with second-order characteristics
	SpoolP An electrical spool with second-order characteristics
	SpoolP2Windings An electrical spool with second-order characteristics
	SpoolPInverted An electrical spool with second-order characteristics
	SpoolM Model of a mechanic spool
	SpoolH Model of a hydraulic spool
	SpoolHPilotOperated Model of a hydraulic spool
	SpoolHDoublePilotOperated Model of a hydraulic spool
	VelocityDependentFriction Model of velocity dependent friction
	PressureDependentFriction Model of pressure dependent friction, used in cylinder models
	thermoRoot Square root function with linear interpolation near 0
	thermoRoot_der Derivative of square root function with linear interpolation near 0

This package contains some friction models and spools. The spools can be divided into four main categories: conventional solenoid actuation, proportional solenoid actuation, hydraulic actuation, and mechanical actuation.

Conventional solenoid actuation

SpoolE, SpoolE2Windings, and SpoolEInverted have a real-valued input and a discrete output. These spools have second-order dynamics and are used in the conventional solenoid valves.

Proportional solenoid actuation

SpoolP, SpoolP2Windings, and SpoolPInverted have a real-valued input and a discrete output. These spools have second-order dynamics and are used in the proportional solenoid valves.

Hydraulic actuation

SpoolH, SpoolHPilotOperated, and SpoolHDoublePilotOperated have pressures at hydraulic ports as input and a real-valued output. These spools have first-order dynamics and are used in the hydraulically actuated valves.

Mechanical actuation

SpoolM has a mechanical flange as input and the spool itself behaves like a mass connected to a spring and a damper. The spool has second-order dynamics and is used in the mechanically actuated valves.