Yes, all that makes sense. One last question before I start cutting metal. Should I measure the required quarter wavelength of tube from the centerline of the main intake tube, the outside edge, or somewhere between the two? On such a large diameter duct this difference becomes significant...
Ok, aluminium it is. I'll make it a double flanged tee with the resonator branching from the centre. That way it can just bolt in between the inlet duct and the shutdown valve so if it needs mods later it can be easily removed. The tuning piston can be a PVC plug with a couple of O-rings for...
Thanks guys, here's a closeup of the intake system. The blower is fitted with a flap valve for shutdown which has to stay so the closest I can get will be next to the round flange after the bend. Space is not an issue and I can go straight up with a 22 inch long 8 inch resonator.
Any ideas...
Thanks Greg ... can I infer that to get the best attenuation effect I should ideally be using the same diameter tube for the side branch resonator?
Ian
I am trying to design a quarter wave side branch resonator for a two stroke V8 GM detroit diesel genset intake. It has a 3 lobe roots blower rotating at twice the crankshaft speed of 1500rpm. I am thinking the dominant pressure wave in the intake will be at at 1500 x 2 x 3 / 60 or 150Hz. I...
Thanks Cory, I agree that it is not economic to persist with the old controls and have several options for an upgrade. I was hoping to get it working simply as a demonstration machine and to help preserve a working example of the technology of the day. These were the last of the Instrons...
I have an Instron TT-D in the lab fitted with an XY chart drive amplifier. Does anyone still have access to such a machine? They were quite popular in the seventies but are no longer supported by the factory. I am setting up an extensometer for training demonstrations and would like to get...
