EMC Plus: HIRF Coupling to an Aircraft Demo (Part 1)
Hello everyone, this is Adel from Ozen Engineering, Inc. In this video, we will explore the EMC Plus HIRF coupling to NERDcraft demo available in the software examples. We will walk through the entire process from defining the simulation domain to assigning properties, setting up probes, and performing some post-processing. We will work with a pre-simplified F16 model exposed to a plane wave of Gaussian poles to simulate multiple frequencies at once. This enables the measurement of canopy sheeting effectiveness and the assessment of coupling onto avionics cables.
Defining the Simulation Domain
- Click on the EMA3D tab and then click on Domain.
- Expand Time to set the following parameters:
- Lowest frequency: 1 megahertz
- Highest frequency: 1 gigahertz
- Set the domain dimensions:
- Minimum X: -1020 millimeters
- Minimum Y: -6000 millimeters
- Minimum Z: 0 millimeters
- Maximum X: 15000 millimeters
- Maximum Y: 6000 millimeters
- Maximum Z: 7020 millimeters
- Change the divisions to use a total of 8 cores.
- Click on the Complete button to encapsulate the aircraft model within the lattice.
Defining the HIRF Plane Wave Source
- Click on Plane Wave.
- Expand General and Orientation.
- Click on Show Names to see the vector labels.
- Orient the plane wave with the electric field polarization vector in the plus X direction by setting:
- Propagation Theta: 90 degrees
- Propagation Phi: 270 degrees
- Polarization Theta: 90 degrees
- Polarization Phi: 0 degrees
- Click Complete to confirm the orientation.
Assigning Material Properties
Next, we need to define and assign material properties to our model:
- Click on Materials and select Isotropic.
- Click New and double-click on Isotropic One to rename it to Boxes.
- Choose a color and set the conductivity to 4.65 E6 S/m. Assign this to the Boxes material.
- Repeat the process for the following materials:
- Skin: Conductivity of 1.12 E7 S/m
- Cabin and Seat: Conductivity of 7.44 E6 S/m
- Engine: Conductivity of 1.12 E7 S/m
- Canopy: Conductivity of 1.01 E7 S/m
- Ribs: Conductivity of 1.12 E7 S/m
Conclusion
In this video, we covered how to define the simulation domain, define the plane wave source, and assign material properties. In the next video, we will see how to create OSham harness cables, create the current, voltage, and field probes, mesh, and run the simulation. Thanks for watching and see you in the next video!
Hello everyone, this is Adel from OSA Engineering and in this video we will explore the EMC Plus HIRF coupling to an Aircraft Demo (Part 1). We will walk through the entire process from defining the simulation domain to assigning properties, setting up probes, and doing some post-processing.
We will work with this pre-simplified F16 model which will be exposed to a plane wave of Gaussian pulses to simulate multiple frequencies at once. This will enable the measurement of canopy sheeting effectiveness and the assessment of coupling onto avionics cables.
Let's start by defining our simulation domain. To do so, let's click on the EMA3D tab and then click on "domain". Let's expand "time", setting minimum to 1 megahertz, maximum to 1 gigahertz, and step size.
For minimum X, set to -1020 millimeters, for minimum Y to -6000 millimeters, for minimum Z to 0 millimeters, for maximum X to 15,000 millimeters, for maximum Y to 6000 millimeters, and for maximum Z to 7020 millimeters. Here, let's change the divisions to use a total of 8 cores.
Once this is done, let's click on the EMA3D tab again. Now, let's define our HIRF plane wave source. To do that, let's click on "plane wave". Expand "general" and "orientation". Let's click on "show names" to see the vector labels.
Here, we want to orient the plane wave with electric field polarization vector in the plus X direction. So, let's set propagation theta to 90 degrees, propagation phi to 270 degrees, polarization theta to 90 degrees, and polarization phi to 0 degrees. Click "complete".
Here, as you can see, our E field is oriented in the plus X direction. And in the simulation tree, we can see our plane wave defined. Next, let's define and assign material properties to our model. Let's click on "materials", then "isotropic". Click "new" and double click on "isotropic one".
Rename it "boxes". Here, we can choose color and set conductivity to 4.65 E6 cm per meter. In the structure tree, let's select "boxes" and click "complete". Here, we can see our E field. Following the same steps, let's assign the next material. This time, we'll assign the "skin".
Let's click on "general", change the color, and set the conductivity to 1.12 E7 cm per meter. Assign that to "scan" and click "complete". The next material is "cabin and seat". Let's change the color and assign conductivity of 7.44 e6 cm 2. Assign that to "cabin and seat" and click "complete".
The next material is the "engine". Let's change the color and set the conductivity to 1.12 e7 cm 2. Select the engine and click "complete". Next, we have the "canopy". Change the color and set the conductivity to 1.01 e7 cm 2. And the last material is the "ribs".
Change the color, assign that to "sound", and set the conductivity to 1.12 e7 cm 2. Select it and click "complete". In this video, we saw how to define the simulation domain, define the plane wave source, and how to define and assign material properties.
In the next video, we will see how to create OSham harness cables, create current, voltage, and field probes, mesh, and run the simulation. Thanks for watching and see you in the next video.
