Time-Domain Analysis of Contact Passive Intermodulation With Vibration

This article makes a time-domain analysis of contact passive intermodulation (PIM) with vibration. A time-domain model is presented to quantify the relationship between uneven contact force and the electrical contact state by observing the test results of PIM with vibration and analyzing related research. The time-domain varying of three-order PIM (PIM3) power is calculated whose periodicity and change tendency agree with the measurement results. Meanwhile, the numerical results explain the vibration modulation phenomenon on contact PIM and the effects of vibration on contact PIM. The frequency doubling of vibration modulation and the increase of contact PIM power are observed from the results under bending vibration. It shows that the mechanical connection in sensitive regions needs to avoid bending vibration.