Introduction

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This is a powerful feature that allows the analyst to access damage from multiple sequences and events, through an intuitive interface that allows the analyst to set up realistic usage sequences. A typical usage sequence may be a car running at a certain gross weight and subjected to various events such as turning, braking, and traveling over potholes. It is very useful for the analyst to identify which events contribute significant damage in a usage sequence or which usage sequence (e.g., different weight configurations) cause significant damage. In either case, the Duty Cycle capability in MSC Fatigue allows the user to simulate usage profiles (sequences) consisting of multiple events, as illustrated in the following example.

Table 17‑1
Term	Description
Sequence	One or more events that make up a given usage scenario; e.g., the events driving over a rough surface and then a smooth surface at a particular weight configuration may be one sequence.
Event	An event consists of loading conditions used to define the event. It may take any number of conditions to completely define an event. For example, a taxi event for an aircraft may require 1 loading condition at the nose gear and 2 load conditions at the main landing gears. In this particular case, the event will be defined with 3 loading conditions.
Condition	A particular combination of a unit FEM results case and an associated time history file; this may also be referred to as a loading condition.
Channel	Point on the structure where a load or acceleration data is measured; a channel is normally associated with only one coordinate direction. This is also the location where FEM loads are applied for an FE analysis.
CFG	A configuration file for specifying which conditions and events are to be used in constructing the Usage profile.

Table 17‑1

Term

Description

Sequence

One or more events that make up a given usage scenario; e.g., the events driving over a rough surface and then a smooth surface at a particular weight configuration may be one sequence.

Event

An event consists of loading conditions used to define the event. It may take any number of conditions to completely define an event. For example, a taxi event for an aircraft may require 1 loading condition at the nose gear and 2 load conditions at the main landing gears. In this particular case, the event will be defined with 3 loading conditions.

Condition

A particular combination of a unit FEM results case and an associated time history file; this may also be referred to as a loading condition.

Channel

Point on the structure where a load or acceleration data is measured; a channel is normally associated with only one coordinate direction. This is also the location where FEM loads are applied for an FE analysis.

CFG

A configuration file for specifying which conditions and events are to be used in constructing the Usage profile.