・粉流れに異常があったことを想定して、振動を多くさせるなどしてブリッジを起こさせる。

03:38 Mar 24, 2015 

In a text that refers to grain/powder flow (rheology in other words), mention of 'vibration' tuning would denote the adjustment of the force and frequency by which that flow is impelled, i.e. by means of vibration tables with an appropriate oscillation pattern, perhaps combined with a slight slope, and/or a particular patterned surface for an even lateral/frontal grain distribution.
If so, could the fault assumed in the text imply an insufficient momentum of the flow resulting in a bank-up of powder at some point of the production line? one which the operators try to overcome by increasing the volume and impact of the powder flow onto that bank-up, to the point where the added volume of flowing powder becomes large enough and fast enough to flow over it (a 'bridge' of sort?) without bonding with that bank-up? That is my tentative speculation. How does that fit with what you have?

06:18 Mar 22, 2015 

Thank you for your help. If you're wondering why they are using vibrations and creating bridges, it is because they are trying to recreate a certain type of abnormality and so they are trying many different things.

Thanks for your help again.

Sam

11:31 Mar 21, 2015 

It could be as you say, especially if as the OP says the document concerns work on trial and test environment. I think we'd need to see quite a bit more of the text to be able to say for sure.

11:15 Mar 21, 2015 

I also found it very strange that they apply vibration, which is usually used to break bridges, to form bridges. I just assumed that they deliberately form bridges to stop the abnormality affecting the downstream, but that's not a convincing assumption.