Stability Criterion

The stability criterion is a set of rules used to determine if a system, like an aircraft or a structure, will maintain its position or return to equilibrium after a disturbance. If the system's design satisfies the stability criterion, it will resist deviations and remain steady over time. Conversely, if it doesn't meet these criteria, small shifts can grow larger, causing instability or failure. Essentially, it helps engineers ensure that systems will behave predictably and reliably when subjected to external forces or changes.