Ansys EMC Plus: MHARNESS Crosstalk Demo

Hello everyone, this is Adel from OZENgineering and in this video I'll show you the basics of setting up an M-Harness simulation. Here we will see how to build a simple cable harness, how to create M-Harness sources and probes. This demo is available in the software example.

So let's consider this geometry which you can draw from scratch or you can just load the given example file into Discovery. The first step in preparing the simulation is to define the computational domain. And to do that let's start by selecting the EMA3D tab and click on Domain.

Here we can expand Time, Lattice, Minimum, Maximum, Step Size. We'll set the Lowest Frequency to 1 MHz and the Highest Frequency to 500 MHz which gives a Step Size of 60 mm. And we will change the Lattice as follows. Later we'll add a probe in this area. Once this is done, let's click Complete.

Now we can construct the harness cross sections by defining the routes that will inhabit each segment. So first let me hide all components except for Curves and also hide the Domain. Now let's select the M-Harness tab. Click on Cabling and select Shield. Select all five line segments.

Then we need to add terminations. So this could be horizontal or vertical termination. Click on Var. Ksi. And you'll notice that we have two wires in the same section and it is personally just hanging in the same position and on div its two halves on the right.

And you can see that each of them are therefore and with our size and size Stanfelixd Prime type and with our DSTL elevators let's come to the next step.

Let's go ahead and create for each segment now let's go ahead and create the selection of the following features plans as before and this will show how to build this simulation. So first let me select and define the route. We'll use the select point tool then we add termination points.

Now let's click here. Select the Library tab. Under General let's go to TSP and select the 26 gauge TSP. And then we click OK. In the next step we will nest a 24 gauge TSP within the shield we just created. Let's go here in simulation tree under harness right click shield one. Add cable.

Select these segments. I click here. Library. Under General. Select TSP. And double click 24 gauge TSP. Now use the select point tool. And add termination. Once this is done click Complete. Now we will nest three additional conductors inside of shield one. So let's go to the simulation tree.

Right click shield one. Click add. And select Conductor. Now we will select these segments. And add terminations. Now let's click here. Select the Library tab. Under General. Let's expand the Wire. And double click the 26 gauge wire. And click OK. Now we can simply copy Conductor one twice.

And we can see that the cable is connected to the shield. So let's copy Conductor one twice in the simulation tree. Then let's right click Conductor three. And click edit. Here we will give the termination located here a 50 ohm resistance. So let's click on terminations. And let's click here.

I'll select the termination. And I'll change the termination. And I'll change the resistance to 50 ohms. Once this is done. Let's just click the X here. And click OK. Now if I click here on Inspect Cross Section. We can visualize the cross sections of three segments within the harness.

Now we need to add a send and receive voltage signal. On the conductors. And the Let's select this wire. And click on its termination point. Here we select Layer three.

I'll select Cable one C 0. And then we'll select the cable one C 0. And then we'll select the cable one C 0. Or if we click click on Boundary. Click OK. We'll repeat the same step for Cable one C 1. We'll add Cable one C 1. Now if we go under Sources. You can see that we have Coil Voltage one.

And Plin Voltage two. So that's the end of that test. Now we need to create and add voltage signals to these pin voltage sources. So let's click on Rectangular in the Signals tab. Let's change the Duty Cycle to 0.25 and rename the signal Send. Now let's repeat the same step.

This time we'll change the Amplitude to minus 1 and we'll rename the signal Receive. Now as you can see both Send and Receive are nested below Signals.

And now we need to click and drag the Send signal to Pin Voltage 1 and the Receive signal to Pin Voltage 2. Now we want to examine the crosstalk between the conductors in the TSP and Conductor 3. We need to create a voltage probe on Conductor 3. And to do that let's click on Cable Voltage.

Let's select the wire and place the probe on the termination point. Here let's select Layer 2 and check the Show Labels box. Select Conductor 3 and click OK. Here the voltage probe is in red and the sources are the green points.

Now in order to simulate the problem we need to assign material properties to our geometry. And to do that let's select the EMA3D tab in the ribbon. Click Materials. Let's select PEC. And click OK. Now we need to create a new material property. Let's select PEC.

And in order to do that, we need to assign the appropriate material to our geometry. Remember to select the Zeigt Surface Tool to assign the material properties to the geometry. OK. And to create the surface object we need to assign the material properties to the Looked Surface Object.

Select the material object in the maple and select your node to assign it to the big object. Ok. Remind us again about the selection didn't start as early as the». So select Speech Size mobile. We want to check that kabya is now selected and supported. Press OK.

Region let's expand Bounds Minimum and Maximum let's set the minimum and the maximum as follow and then click Complete here in the simulation tree under probes we have our voltage probe and feed probe and now the next step is to match the geometry so let's click here and now to start the simulation we can click here and click run here under results let's try to click on Feed for one and click on Compute Field Averages Analysis Directions X Y and Z click OK now if I go under Visualization alright click on Feed Probe One Feed Statistics One and select Show we can see the results now to view the results of the cable voltage probe let's try to click on Voltage Probe One Plot and here as you can see not a lot of crosstalk occurred between the the STP and the unshielded conductors.

This concludes this M-Harness Crosstalk Demo. Thanks for watching and see you in the next video. Thank you for watching. See you in the next video. Bye. Hope you enjoyed this video.