In HyperLife v2026, for frequency-domain sine sweep fatigue using FRF results (Vibration → Frequency Domain, Sine), how is “Number of Sweeps” defined internally? Specifically: * Does 1 sweep correspond to a single-direction sweep (Start → End frequency), or * Does 1 sweep correspond to a full cycle (Start → End → Start)? In FRF Analysis I have entered frequency load from 7Hz to 200Hz, with a frequency increment of 1 Hz. This clarification is required to correctly model test standards (e.g., AIS-156 vibration: 7–200–7 Hz, 15 min per cycle, 12 cycles) without over- or under-counting fatigue damage.

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Definition of “Number of Sweeps” in HyperLife Frequency-Domain Sine Sweep Fatigue (v2026)

Anuj Nandal_21993

In HyperLife v2026, for frequency-domain sine sweep fatigue using FRF results (Vibration → Frequency Domain, Sine), how is “Number of Sweeps” defined internally?

Specifically:

Does 1 sweep correspond to a single-direction sweep (Start → End frequency), or
Does 1 sweep correspond to a full cycle (Start → End → Start)?

In FRF Analysis I have entered frequency load from 7Hz to 200Hz, with a frequency increment of 1 Hz.

This clarification is required to correctly model test standards (e.g., AIS-156 vibration: 7–200–7 Hz, 15 min per cycle, 12 cycles) without over- or under-counting fatigue damage.

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HyperLife

OptiStruct

v2026.0

Accepted answers

solon

yes correct

All comments

solon

Hello,

1 sweep correspond to a single-direction sweep (Start → End frequency),

Anuj Nandal_21993

So to map Start → End → Start I will have to consider it as 2 cycles of Start → End frequency?

solon

yes correct