Frequency Analysis Options

The Frequency dialog box lets you select the required options for a frequency study.

Loads affect the modal characteristics of a body. For example, compressive loads decrease resonant frequencies and tensile loads increase them. This fact is easily demonstrated by changing the tension on a violin string. The higher the tension, the higher the frequency (tone). You do not need to define any loads for a frequency study but if you do their effect will be considered in the calculation of the resonant frequencies.


Number of Frequencies Lets you set the required number of natural (resonant) frequencies to be calculated. The default is to calculate the lowest five frequencies. Rigid body modes are calculated by the FFEPlus solver. A body without any restraints has six rigid body modes. Rigid body modes have zero frequencies (infinite period).

If the working scenarios of the model include dynamic loads, it is important to calculate at least one frequency that is higher than the frequency of the load. In most situations, resonance is not desirable because it causes failure. However, some devices exploit resonance to trigger an event while providing measures to control the excessive associated deformation.

Upper Bound Frequency Lets you set the upper bound frequency of the required frequency range. Use the default value of zero unless you are not interested in natural frequencies higher than a certain value. Entering zero results in calculating the specified number of frequencies.
For the FFEPlus solver, you can specify the Number of Frequencies or the Upper Bound Frequency. For the Direct Sparse and Intel Direct sparse solvers, you can only specify the Number of Frequencies and specify a frequency shift.
Calculate frequencies closest to (frequency shift) Available for the Direct Sparse and Intel Direct Sparse solvers. Select this option to specify a frequency value of interest. The software calculates the frequencies closest to the specified value. This option is referred to as frequency shift in the literature. You can use this option to avoid calculating rigid body modes.
In cases where the frequency analysis cannot run because of singularity of the stiffness matrix, use the frequency shift option to overcome the singularity issue. Increase the shift value gradually from zero until the Direct Sparse solvers successfully calculates the requested frequencies.

If you set a higher value for the frequency shift, the Direct Sparse solver selectively calculates the requested number of frequencies, which are clustered around the shift value. Thus, you can avoid the computation of lower range frequencies (including the rigid body modes), which may be of no interest to your analysis, and save computational time.

Use inplane effect This option is internally activated to account for the effects of any applied loads on the model's stiffness. See also SOLIDWORKS Simulation Help: Use Inplane Effect.
Use soft spring to stabilize model Select this option to add soft springs to stabilize inadequately supported models.


Lets you specify the solver to be used in calculating resonant frequencies and the associated mode shapes. To include the effect of loading on the resonant frequencies, select Automatic or Direct sparse.

Automatic The software selects the best equation solver (Intel Direct Sparse or FFEPlus Iterative) based on the number of frequencies, mesh type, geometric features, contact and connector features, and available system memory.
Direct sparse Check this option to use the Mode Extraction Routine powered by the Direct Solver when running the study.
FFEPlus Check this option to use the FFEPlus solver when running the study.

Save Results

Save results to 3DEXPERIENCE

Saves the simulation results with the associated SOLIDWORKS model on the 3DEXPERIENCE platform in a storage area known as a collaborative space.

After saving SOLIDWORKS Simulation results along with the associated SOLIDWORKS model on the 3DEXPERIENCE platform, you can search for these database objects in the collaborative space in which they are saved, and download them directly in SOLIDWORKS.

See also Saving SOLIDWORKS Simulation Results on the 3DEXPERIENCE Platform.

The option to save simulation results (.cwr) files on the 3DEXPERIENCE platform is available only when you activate the appropriate 3DEXPERIENCE SOLIDWORKS role.

Save results to disk drive Saves the simulation results (*cwr) file to your local disk drive.
Save results to SOLIDWORKS document folder Saves the simulation results (*cwr) file to the same local folder where the associated SOLIDWORKS model is stored.
Select a folder to store the results file Selects a folder path to save the simulation results (*cwr) file. The selected folder path is shown in Results folder.
Average stresses at mid-nodes (high-quality solid mesh only) Calculates the stresses at the mid-side nodes by averaging the stress values of the nearest corner nodes. This option gives better stress results when irregular high stresses occur at mid-side nodes of high-quality solid elements that are located at areas with steep curvature.

Available for a high-quality solid mesh.

  • Stresses at corner nodes (1, 2, 3, and 4) globally averaged over the shared elements.
  • Stresses at mid-side nodes (5, 6, 7, 8, 9, and 10) averaged over the nearest corner nodes. For example, stress (node 5) = (stress (node 1) + stress (node 2)) / 2