Application is on a personal race car. It will need to be reliable. Valve will mounted on or near the cylinder, operated by a push pull cable so no hot oil near the driver.
I posted this in the mechanical fluid power section, but figured I would cross reference the post here as it is an automotive application.
http://www.eng-tips.com/viewthread.cfm?qid=363958
I have an idea that I'm trying to see if it is practical to implement cheaply with off the shelf components or semi-custom components (i.e. custom cylinder stroke). Don't want to get into too much detail on the application, but the fluid power will come from engine oil with a minimum operating...
I have been designing lifting appliances for ROV's for over 10 years now and I am currently a consultant. I have gone through the certification process numerous systems with ABS and with DNV. I would get your hands on the following three specifications as I have found that all three have some...
That is a better way to put it. My biggest issue is most of my experience is in offshore oilfield from when I lived in Houston. I currently live up on the east coast and many of the companies I have cold called have said they don't mind using hired guns, but they need to be local.
The double hatch is often used with hazardous area classification. One method a client of mine uses in a hazardous area is to pressurize the inside of their manned container with air from a clean intake vent mounted outside the hazardous area. This pressurization acts to keep any explosive or...
Yes, aluminum is more reactive than steel and in theory would rot away first, BUT aluminum oxide is LESS reactive than steel. Therefore, when the aluminum forms its protective aluminum oxide coating, the steel turns into the anode and rusts away.
If you do decide to use aluminum on a steel...
I have 11 years of experience and have been working contract for the past 3 years as a mechanical/ocean engineer. I spend about 1/3 of the year traveling, mostly oversees typically a month at a time and the rest of the time working from my home office. About 95% of my work has come from one...
Good news! I found a typo in my Mathcad sheet and now the Secant method and the beam method agree within 20 psi! That gives me a fair bit of confidence that I've got the right answer now. Thanks for the help!
I was crunching the numbers using the cantilevered beam based on Roark's Table 8.8-1a as well as the Secant method and came up with the following:
Load Case 1
Axial Load = 111 kips
Transverse Load = 108 kips
Secant Method = 20.6 ksi
Beam Method = 12.4 ksi
Load Case 2
Axial Load = 615 kips...
I am only using the critical slenderness ratio to determine that I am in the short column range not intermediate or long column where Euler would apply. I was 99.9% sure it was a short column, but it never hurts to document it.
Yes, the Secant formula is for a column with an eccentric axial...
This is a short cylinder shaft approx. 3' long and 14" dia. It is being used to lift a heavy load up. At the end of the shaft is a footing with a roller and a small cylinder is pushing sideways on the foot. Subtracting the roller friction from the sideways cylinder force gives the resultant...
I'm working on a problem dealing with buckling on a short shaft with combined compression and side loading. The slenderness ratio is only 10. The side loading can be significant (as much as 1:1), but as the compressive load goes up the side load decreases. I haven't been able to find a...
I am trying to find some guidelines on designing a "hard" gate for an a-frame so I can verify a new design. Many of our clients have started to refuse equipment with chain or wire for handrails and gates. Because of this, I came up with a very simple 4-bar linkage that folds up vertical on one...
Granted it has been 11 years since I graduated from Texas A&M - College Station with a BS-OE, but when I was looking at schools I found that even though many schools have an OE program, they often concentrate on different areas. Besides researching the quality of the degree program, try to find...
A really good place to start would be to contact American Bureau of Shipping (ABS) and/or Det Norske Veritas (DNV). These are two of the big firms for standards regarding vessels. Often times when starting a new major project we will meet with whichever firm is going to be the certifying...
We only use -20C because our equipment is used offshore and it just doesn't get as cold offshore as it does onshore. Majority of the systems are in the Gulf of Mexico, offshore West Africa, Indian Ocean/Southeast Asia so they will never see cold weather. However, my client does operate some...
Unfortunately, I'm on a boat in St. Johns, Newfoundland on a different job and don't have access to any of my reference books or any of my calculations regarding the loading on the beam in question. I have to tell the supplier they can either keep trying to source the original W16x67 or wait...
I have a supplier in Singapore that is having a hard time finding various size wide flange beams in low temp rated material. He has come back asking to fabricate the beams instead out of ABS EH36 material. This plate material is already approved by us and is used for many of the plate...
There are two things we need from the predicted failure load.
1. How much load are we going to need to fail the a-frame so we can size the water bags or hydraulic cylinder.
2. Try and correlate how much factor of safety on failure do we actually have with our SWL using our current design...
