Project 1

Aim: Develop a double-acting actuator model using Simscape Multibody and Simscape components. The mechanical system of the cylinder needs to be built using Simscape Multibody library components / blocks, and the hydraulic system needs to be modelled using Simscape library physical components

Theory: Double-acting actuator model

You can model the mechanical part of the system in Simscape Multibody. For example, to model the cylinder and piston, you can use the Revolved Solid (Simscape Multibody) and Cylindrical Solid (Simscape Multibody) blocks. To provide the translational degree of freedom for the piston, use a Prismatic Joint (Simscape Multibody) block. To easily calculate the lengths of the chambers A and B, you can attach the base frame (B) and follower frame (F) of the joint to the centers of the left inner surface of the chamber A and the left surface of the piston, respectively. Make sure that the Z-axes of the B and F frames are aligned and both point toward chamber B.

Using this convention, the length of the chamber A, dA, is the position output of the joint block, and the length of the chamber B, dB, equals the difference of the stroke length and dA. To ensure that the piston does not travel beyond the ends of the cylinder, you can specify the upper and lower position limits of the Prismatic Joint block.

The schematics show the cylinder in three configurations: half-retracted, fully retracted, and fully extended.

Double Acting Hydraulic Actuator System:

Double-acting hydraulic cylinder Double-acting hydraulic cylinders are linear hydraulic actuators that perform the movement in both directions using hydraulic pressure. The piston stroke in double-acting cylinders is much longer than in a single-acting cylinder.

This figure shows the block diagram of the double-acting cylinder model described above. The example uses two Translational Mechanical Converter (IL) blocks to model the chambers A and B of the cylinder. A Translational Multibody Interface block connects the Translational Mechanical Converter (IL) blocks to the Prismatic Joint block. See Connecting Simscape Networks to Simscape Multibody Joints for details of how to use the Translational

Simscape Model :

Hydraulic system :(Physical model)

Translation Hydro mechanical Converter

4 -Way Direction Valve

Hydraulic Fluid:

PS- constant:

Pressure Relief Valve:

Mechanical Model :

Cylinder Assembly:

Piston Assembly:

Result:

Input values

Conslusion:

We conclused that as question we design and developed the Double-acting actuator model using Simscape Multibody and Simscape components. The mechanical system of the cylinder needs to be built using Simscape Multibody library components / blocks, and the hydraulic system needs to be modelled using Simscape library physical components.