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  1. smjmitchell

    Alodining of Assemblies

    Hello, I wonder if someone with knowledge of the alodining process could comment on the advisability of alodining assemblies (as opposed to separate parts that are later assembled which is normal practise). What problems and issues are likely to be encountered ? I have two scenarios in mind...
  2. smjmitchell

    Castable Polyurethane

    Hello, I have a requirement to design a polyurethane wheel for an industrial application - imagine something similar to a skateboard wheel. The wheel is to be cast in a steel mould. Can anyone tell me what materials are most commonly used for wheels of this type. I repeatedly find...
  3. smjmitchell

    NASTRAN Flutter / Aeroelasticity

    Hi All, Does anyone one here have experience in performing fluter and/or aeroelastic analysis with NASTRAN ? If so I have a question regarding the spline elements that connect the aerodynamic and structural meshes. The NASTRAN documentation leaves many unanswered questions about how these are...
  4. smjmitchell

    Turbofan Inlet Diffuser

    Hi, Can anyone tell me what are the typical design conditions for the inlet diffuser on a turbofan engine for an airliner, for example a JT9D as used on the 747-200. By design condition I mean what flight condition (i.e. static, takeoff, climb, cruise etc) is the main design point used to...
  5. smjmitchell

    Coil Spring Design Basics

    Hi All, I need to do some work designing steel coil springs (approx 2" dia x 12" long - loads approx 1500-2000 lb). I am familar with the basic theory of coil springs for calculating stresses etc however I have a couple of questions of a more practical nature: 1. What are the most common steel...
  6. smjmitchell

    Bronze Bearing Allowables

    Hi All, I have a bronze bearing through which a chrome plated steel tube slides (actually the lower bearing in a telescopic landing gear leg for a light aircraft). The bearing is a hollow cylinder approx 1.25" high with a bore of approx 2" and is pressed into the outer tube of the leg and...
  7. smjmitchell

    Deflection of Rubber Cylinder

    Hi All, I have a rubber cylinder 40mm dia (1.57") and 331mm (13.03") long. It is made from natural rubber of duro 50. The rubber is supported from buckling under compressive load by a number of diagaphrams that slide over the rubber and are evenly spaced along the length. I need to predict the...

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