Pan makes knocking noises
I've had this issue also with new pans.  I've purchased pans before that need to be seasons and tempered by heating in the oven.  As any metal heats it expands, during expansion you will hear little knocks and creaks.  I've had pans with rolled edges that trapped water from washing, has caused the water to escape as steam and whistle on its way out, very disconcerting sound. 

You may try checking the manufactures website (check bottom of pan for name) to see if you may need to temper your new pan in the oven prior to using. My daughter and I are a stickler for reading directions on every new item we get, which is how I learned to temper my pans. I wouldn't worry too much about the sounds it makes, over time it will stop. 

If the pan is a frying pan the easiest way to temper it is to put some oil in the pan and heat it till the oil comes to a smoking point (remember different oils have different flash points, cheap vegetable oil being one of the lowest).  Remove pan from the heat and allow to cool, pour or wipe out any excess oil. For long lasting non-stick surface on your stainless steel pan don't allow it to come in contact with water.  The stainless steel is very porous and the water will wash the oil away.  Also, never put a hot pan in water, it will warp it. Watch the video I linked below to learn how to season your new pan. 

https://www.youtube.com/watch?v=1376ITxF1Oc