How to securely solder a wire to a vibrating SMD PCB?
A SMD pad is not a good way to attach a wire.  That should be done with a thru-hole pad.  You might even want two thru-hole pads to loop the wire thru for better strength.

If the wire is vibrating a lot, then maybe a few zig-zags in the wire near the PCB will cushion or decouple the wire motion from the PCB a bit.