What are the features of natural frequency vibro-conveyor?

[Butters]

I'm considering two types of vibrating feeders, brute force and natural frequency. Can you tell me how natural frequency conveyor works?
What kind of design should I choose to transfer light materials? What If I want to use an upwards angle, how do I determine that upward going path of materials? Any thoughts on transfer rate calculation?

 

[Butters]

I've managed to get some data therefore there're some new things to consider:
Knowing conveyor's frequency, displacement and acceleration how do I find material transfer parameters?