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  • Users: butelja
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  1. butelja

    Hose Modeling

    Any tips on how to do the following? Given: Hose endpoints X,Y,Z coordinates, endpoint tangent vectors, and hose length. How to construct spline that has minimum strain energy for the constraints given above.
  2. butelja

    UG is awesome!

    I recently changed jobs from being a design engineer in a floundering mom-&-pop chemical manufacturing firm to a design engineer in a major civil/military aerospace firm. I had extensive 2D/3D Autocad experience, some experience in solid modeling with SW, and had also "played" with...
  3. butelja

    400 Hz Power

    Does anyone know of a good reference which gives the history behind aircraft standardizing on 400 Hz AC? I've heard of many of the advantages related to weight savings, etc., but not the origin of the decision. Why not 200 or 500 Hz?
  4. butelja

    Reference Books

    I am looking for suggestions on good reference books that cover hydraulic, pnematic, fuel, and secondary power systems design. Specifically as it relates to tactical fighter jet aircraft. Any suggestions? Thanks.
  5. butelja

    Reference Book(s)

    I am looking for suggestions on good reference books that cover hydraulic, pnematic, fuel, and secondary power systems design. Specifically as it relates to tactical fighter jet aircraft. Any suggestions? Thanks.
  6. butelja

    Tank Internal Supports

    I am designing internal supports for a large bayonet heater that will be installed in an API 650 oil storage tank. Due to thermal expansion, the heater will have to slide over the supports. It is desired to NOT have cross bracing between the internal supports to resist the lateral loading...
  7. butelja

    Solidworks 2003

    I've seen the press releases about the increased functionality. Does anyone know (or have a good guess) when it will be released?
  8. butelja

    Transient Fanno Flow

    I'm attempting to model the fluid dynamics of a 2 stage gas gun, which is essentially an oversized BB gun. When examining the internal ballistics of any gun, the projectile can never go faster than the speed of sound of the propelling medium. By causing air (or another inert gas) to undergo...
  9. butelja

    Chilled water - Air handler

    What are the relative plusses and minuses of these 2 control methods within an air hanlder, considering both temperature and humidity control? a.) Constant airflow through chilled water coil and varying chilled water flow. or b.) Coil bypass dampers and constant chilled water flow.
  10. butelja

    Coriolis Mass Flow Meters

    Does anyone have information on the range of frequencies that the tubes in a coriolis mass flow meter vibrate? I know from (bad) experience that external vibration can negatively affect the meters. I'm trying to design an isolation system for a meter installation in an area that has high...
  11. butelja

    Erosion Resistance

    I know that hardness plays a large part in erosion resistance of metals. My question is, what other properties (yield strength, ult. strength, etc.) must be considered to qualitatively compare different metals and their relative erosion resistance. Assume a noncorrosive service (diatomaceous...
  12. butelja

    ANSI Dimensioning Symbols

    I am running Autocad 2000. Unless I'm missing something, the ANSI dimensioning symbols (counterbore, countersink, depth, etc.) do not appear to be available out of the box. Does anyone know where I can get a font file that includes the ANSI dimensioning symbols? Thanks.
  13. butelja

    Packing for 1300 ¦F Valve

    I have a valve application where a 10" class 150 butterfly valve is in a service that operates at 1300 °F, has 14% oxygen, 7% SO2, and balance N2 in the process stream. Valve steam leaks are a real problem. Conventional graphite packing oxidizes and disappears above 900 °F, which we have...
  14. butelja

    Frontal Area

    When drag coefficients (Cd's) for a road vehicle are quoted, how is the frontal area calculated? Is it: a.) The "true" frontal area where the area below the air dam is not counted. This frontal area would not be affected by raising or lowering the ride height. or b.) The...
  15. butelja

    Fluid Power Reference

    I'm looking for recommendations on good reference books that cover fluid power (both hydraulic and pneumatic) system design and analysis. Are there any de facto industry standard "bible" type all-in-one reference books out there? Thanks in advance.
  16. butelja

    Gyroscope Application

    Surely someone in the past has had this idea before. If anyone knows of any published reports or patents dealing with this or a similar idea, I'm curious for more details. Here it is: A relatively large gyroscope is rigidly mounted in a vehicle at the vehicle's center of gravity with its spin...
  17. butelja

    Crazy Gyroscopic Idea

    Surely someone in the past has had this idea before. If anyone knows of any published reports or patents dealing with this or a similar idea, I'm curious for more details. Here it is: A relatively large gyroscope is rigidly mounted in a vehicle at the vehicle's center of gravity with its spin...
  18. butelja

    Crazy Gyroscopic Idea

    Surely someone in the past has had this idea before. If anyone knows of any published reports or patents dealing with this or a similar idea, I'm curious for more details. Here it is: A relatively large gyroscope is rigidly mounted in a vehicle at the vehicle's center of gravity with its spin...
  19. butelja

    Mechanical Analog Computers

    I recently watched a documentary on battleships built during the 1930's-1940's. I was fascinated to learn that the fire control computers were 100% mechanical analog devices that considered 10 or more input variables to compute in real time the gun aiming. Does anyone know of any books that...
  20. butelja

    Local VAR Out of Line?

    Here's the deal. I've made a proposal to my boss (and his boss) regarding upgrade from Autocad to SW2001+ for mechanical design. I design custom equipment for in-plant use in a chemical processing environment. Since my bosses are not ME's (CHe and MBA Co--sucker), they have a combination of...

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