The Prestressed Analysis, Eigenfrequency () and Prestressed Analysis, Frequency Domain () study types perform a stationary analysis of the problem to compute the prestressed state and then perform the appropriate prestressed analysis. In both cases the prestressed state can be computed using any stationary problem.

For exclusive boundary conditions (that is to say, loads which overwrite previously added loads of the same type, such as the potential load in electrostatics), Harmonic Perturbation is added as a subnode to the boundary condition node. Its magnitude is added in the subnode itself.

The Prestressed Analysis, Eigenfrequency () study is used to compute eigenfrequencies and eigenmodes that are influenced by a prior static load.

The study consists of two study steps: a Stationary study step followed by an Eigenfrequency study step. The study computes the eigenfrequencies and the shapes of the eigenmodes when influenced by a prior static load on the structure.

The Prestressed Analysis, Frequency Domain () study is used to compute the response to harmonic loads fluctuating around a prior static load.

The study consists of two study steps: a Stationary study step followed by a Frequency-Domain Perturbation study step.

The effects of the preload can be computed with or without taking geometric nonlinearity into account. For this study type it is necessary to specify the magnitude of the harmonic load, as this determines the magnitude of the system response. In order to do this, a Harmonic Perturbation force must be added to the model. For contributing loads (that is, loads that can be added without overwriting the same type of node, such as a boundary load in solid mechanics), right-click the node and select Harmonic Perturbation. In this case, a load to generate the prestress must be added separately to the model.