How we change what others think, feel, believe and do
Get the Maitre d' or another person to introduce you.
Hello, this is your waiter Simon who will be looking after you today.
As you are being introduced, stand smartly and relaxedly (not to attention but also not slouching), smiling at each of the people there.
When someone introduces you, there are several psychological effects going on.
First, they appear as senior and you as junior. As a junior person you will be assumed to earn less money and so be more deserving of a tip.
Being introduced also adds a certain formality to proceedings, reminding people of the rules and, by implication, the rules for tipping.
Last but not least, it gets your name into their heads and so gives benefits of being made a 'real person' in the eyes of your customers.
You can also have the person come back later and ask 'How's Simon getting on', although be careful with this as it can appear as if you are a trainee and therefore not qualified enough to be tipped.
Garrity, K. and Degelman, D. (1990). Effect of server introduction on restaurant tipping. Journal of Applied Social Psychology, 20, 168-172.