Dynamic Response Analysis

This section gives you formulas to calculate excitation in a harmonic dynamic response case or in a transient dynamic response case.

To know more about the load excitation and the restraint excitation, refer to Defining a Load Excitation Set and Defining a Restraint Excitation Set.

Note that: Excitation is only available with the Generative Dynamic Response Analysis (GDY) product .

Load excitation in frequency domain

The formula corresponding to the Load Excitation Set dialog box in a harmonic dynamic response case is:

where:

The user interface looks like:

In this particular example:

k = 1 ; F₁ = Loads.1 ; M₁(f) = White Noise.1 = 1 f; C₁ = 1 ; = 0 deg = 0 rad

The formula corresponding to the Load Excitation Set dialog box in a transient dynamic response case is:

where:

The user interface looks like:

In this particular example:

k = 1 ; F₁ = Loads.1 ; M₁(t) = Time Modulation.1 ; C₁ = 1

The formula corresponding to the Restraint Excitation Set dialog box in a harmonic dynamic response case is:

where:

f is the frequency
is the value of acceleration corresponding to the degree i of the vector
M_i(f) is the frequency modulation corresponding to the degree i of the vector
is the phase corresponding to the degree i of the vector

The user interface looks like:

In this particular example:

; M₁(f) = White Noise.1 = 1 f ; M₂(f) = ... = M₆(f) = 0 ; = 180 deg =rad

The formula corresponding to the Restraint Excitation Set dialog box in a transient dynamic response case is:

where:

The user interface looks like:

In this particular example:

; M₁(t) = Time Modulation.1 ; M₂(t) = M₃(t) = 0