I'm analyzing a flag pole for wind loads and wanted to see what the critical wind speed was for vortex shedding. I'm using Vc = fd/s where f=natural freq, d=diameter of pole, and s=Strouhal number. I'm assuming the pole could be modeled as a cantilevered beam with fixed end? Also, I've found...
I'm a little out of my area here, but, I'm the "hey you engineer" guy so I've been tasked to analyze the loads on a vertical flag pole. What I've done is taken the power from a stream of air ( P = .5 x rho x A x V^3) and then used the average wind speed x 10 to get the force. I'm assuming this...
I've been tasked to design an oscillator for a fan unit and I must confess this is really not my forte. I have the bar linkage worked out but I need help selecting a linear actuator. Basic requirements are to rotate a head that weights approximately 200lbs. I'm guessing the speed of the...
I was wondering if anyone had a link to some studies or data showing how effective Zinc plating is for fasteners relative to other platings or say stainless steel? In my experience I've found that Zn doesn't hold up particularly well when exposed year round to the elements but I'd like some...
I was wondering if anyone could recommend a spray coating I could use to protect Grade 8 carbon steel fasteners that will be installed in an indoor swimming pool? I'm aware of the issues surrounding chloramines and their effects on typical stainless steels, but the Duplex and 6%Mo alloys are...
This may be a trivial question to those in the industry, but, can anyone help me understand the concept of static pressure in terms of fan design and operation. From some works I've read they make it seem like something present in the environment (ie atmospheric press), and some describe it...
We use a safety cable and shackle system as a redundant backup for things we attach to ceilings/roof structures. For the applications going into indoor swimming pools we have specified mostly 6%Mo fastener material to guard against SCC. I'm having trouble finding a shackle made of this...
I'm wanting to use a piece of bent round tubing to support a TV. The tubing would be anchored to an I beam with 2 "U" bolts and the bend would be 90 degrees. Does anyone know how to analyze this system to make sure the tube I spec is sufficient? This is probably an elementary question but all...
I need to hang an overhead fixture that weighs approxiamtely 500lbs. My company currently uses 4 Ø1/2-13 UNC grade 8 bolts for this purpose. I came up with a torque spec from the Machinery's handbook of 128ft-lbs to torque the bolts down. I am wondering how much capacity is left for the bolt...
I'm looking at installing a fixture overhead in an indoor swimming pool facility. I am aware of stress corrossion cracking and found some articles from various sources stating 254 SMO is the best material for this specific application. Does anyone know how 254 SMO would compare to say, AL6XN...
My company is looking to use a Ø3/4" pipe nipple to hang a load of less than 100lbs in a particular assembly. Some concern exists over the strength of the pipe threads being loaded in tension. I looked for a way to analyze this problem but cannot really come up with anything. Most of the...
I know what the "Venturi Effect" is, but what is the defining charachterisitc that makes a fan a "venturi style"?....How can you tell this is a venturi style as opposed to some other style?
Thanks
I'm trying to analyze a safety cable problem and need some help. Basically we have a 1/4" Ø galvanized steel cable that is wrapped around angle iron (of structure) and through an extension tube (of our propduct). If the object falls the cable will engage after a fall of 3.5ft. I calculated...
