Grounded joints can be used as a boundary condition in random vibration analysis in Ansys Mechanical. Grounding a joint means that it is fixed in place and cannot move in any direction. This can be useful in situations where you want to model a structure that is connected to a rigid foundation or where you want to simulate the effect of a fixed support.
To apply grounded joints as a boundary condition, you first need to create the joint in your model. This can be done by using the "Joint" tool in Ansys Mechanical. Once you have created the joint, you can select it and set its boundary condition to "Fixed Support" or "Fixed Geometry". This will effectively ground the joint and prevent it from moving during the analysis.
When performing a random vibration analysis, you will need to specify the input loads and the frequency range of the analysis. Ansys Mechanical has several tools for generating random input loads, such as random vibration profiles and power spectral density functions. You can also specify the frequency range of the analysis using the "Frequency Response" tool in Ansys Mechanical.
After setting up the input loads and frequency range, you can run the analysis and view the results. The results will show the response of the structure to the random input loads over the specified frequency range.