![]() Because Simscape and Simscape Fluids use Solver technology above and beyond what is available in base Simulink, we will need access to additional settings. We will specify the speed of our pump using a constant block.Īnd we will specify it to speed at its rated speed of 188 radians per second. The other side of this source we will attach to a point fixed in space. ![]() We will insert an ideal angular velocity source in order to spin our pump at a fixed speed. We will click and drag to create a mechanical connection. Our physical system is complete, but we still need to specify the inputs to our system. To specify the inertia of our load, we will click and drag, and add a mass block, and set the mass to be 100 kilograms. And we'll attach this side to a point fixed in space. We want the cylinder to act against the spring damper, so we will click and drag, and also add a translational damper. We will click and drag to create a mechanical connection, and then add a translational spring. We wish to have this act against a mechanical load. The other side is the rod, which is connected to the piston in the cylinder. We will connect this point to a point fixed in space. These two mechanical connections represent the mechanical connections from our cylinder. And we will change the hard stop parameters. We'll change the piston stroke to match our design for our system. We'll need to make this to actuator a bit bigger to handle our backhoe arm. I'll place this component in our network, create the additional hydraulic connection, and then double click on the block to set the parameters. Here we can see the different cylinder components that we can use. I will click and drag to create a hydraulic connection, and type in cylinder. I'll also connect the low side of our hydraulic directional valve to our tank as well. I'll connect the low side of the relief valve back to our tank. And I will adjust them to make them commensurate with the size of the pump and valve that we are working with. Double clicking on this block, I can also change these parameters. I will right click and drag to create a hydraulic branch, and then type in relief valve to get the component. We will use a pressure relief valve to do that. We need to limit the pressure coming from the pump. I will connect the P port of our valve to the high side of the pump. I will increase the size of this valve to make it commensurate with the pump, and leave the rest of the settings as they are. ![]() There are multiple parameterization options, so I can select the one appropriate for the datasheet that I have, or I can use one that's appropriate for measured data. I'll type in 4, and select from one of the directional valves that are available.ĭouble clicking on the block, I can go in and specify the different parameters. To control the flow of fluid from the pump to the hydraulic actuator, we need a directional valve. I click and drag to create an ideal hydraulic connection, type in reference, and here I have an ideal hydraulic reference, which will represent our tank. We will use a hydraulic reference to represent that. Our pump needs to draw fluid from a tank. I can specify the pump displacement here. Here I can see a list of the pumps I can choose from, and I will select a fixed displacement pump. I will click on the diagram, and type in the word pump. The first thing that we'll need to add into our system is a pump. This will open up a Simulink model with the settings recommended for Simscape models. ![]() To start, we will enter the command ssc_new into the MATLAB ® command window. I'll now switch over to the model so you can see how this is done. We will then connect this to a realistic model of a three-dimensional mechanical system to see how it behaves. The model we build will look like this, and we'll see when we run our simulation that the piston goes over its entire range of travel. We will model this system within the Simulink ® environment using Simscape Fluids. A motor will drive the shaft of the pump controlling the speed, and a control system will adjust the position of the valve. In our model of the hydraulic actuation system, the spool inside this valve controls the flow of pressure from a pump to either side of a hydraulic cylinder, which can extend and contract. In this demonstration, we're going to see how to model a hydraulic actuation system using Simscape Fluids.
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