Particle swarm boundary bouncing

Dear MATLAB community

I am using the particle swarm algorithm to find the optimal parameters for a script.

The script take 8 parameters and I set boundery conditions between 1 and 15000.

I am currently testing the optimization procedure on a problem where i know the best parameters.

The problem I am facing is that the global best for parameter nr. 8 is 10, but all particles seems to fix at a value of 1 for parameter 8 after a few iterations.

As I understand the particle swarm algoritm the particles hit the boundery conditions with a certain velocity, and then stays fixed at the boundery.

Is there a way to make a particle bounce on the boundery instead of 'truncating' it at the boundery?

I hope my question makes some sence, I am very new to optimization.

Thanks and best regards,

Michael