ansys static structural analysis examples

Inertia Relief during analysis of such a structure requires that mass be properly represented, just enough constraint be applied to prevent free body translation and rotation, loads be applied, and Inertia Relief be requested. Depending on the position and direction of the applied force versus center of gravity, accelerations may exist in X, Y and Z, as well as rotational accelerations about X, Y and Z. Inertia Relief gets the FEA model to exactly balance the force difference (applied force minus weight) in a static analysis with acceleration body forces over the whole structure, so that the reaction on the vertical constraint is zero. In a transient analysis, in the absence of vertical constraint, the structure would be accelerated by the force difference between weight and applied vertical force, and the structure would both move and vibrate during the transient analysis. If there is enough constraint to prevent vertical motion, but the vertical load does not exactly match the weight, there will be strong reaction forces where the vertical constraint is applied. Without constraint in the vertical direction, the global stiffness matrix is singular, and no solution exists. Consider a structure that has mass, and a vertical load that exceeds its weight. Industrial Equipment and Rotating MachineryĬreating a Detailed Static Analysis with Intertia Relief in Ansys Mechanical Practical Example | Inertia ReliefĪn example helps explain Static Analysis with Inertia Relief.Torsional Vibration Measurements Testing.Fluid Flow & Thermal Applications (CFD).Electronic and Electrical Applications (EM).

The dynamic amplification factor and phase lead are shown in Figure 1-5 and are plotted as functions of forcing frequency. In this case, the magnification factor is 1/(2ζ), and the phase angle is 270 degrees. In addition, any measurable displacement response will be 180 degrees out of phase with the loading (i.e., the displacement response will have the opposite sign from the force). In this case, the structure does not respond to the loading because the loading is changing too fast for the structure to respond. If ω/ω n is much greater than 1, the dynamic amplification factor approaches zero, yielding very little displacement response. If ω/ω n is much less than 1, the dynamic amplification factor approaches 1 and a static solution is represented with the displacement response in phase with the loading. The interrelationship among the natural frequency, the applied load frequency, and the phase angle can be used to identify important dynamic characteristics.

Ansys static structural analysis examples