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  1. EsoEng

    Suspension for trailer with wide loading range

    @BrianPetersen, I'm considering this air-shock: https://www.amazon.co.uk/Monroe-MA785-Max-Air-Adjust-Absorber/dp/B000C55SVE/ It is currently used in Bushtec motorcycle trailers, and I believe in some motorcycles replacing original coil-overs. I've heard of no issues concering damping being too...
  2. EsoEng

    Suspension for trailer with wide loading range

    Thanks for your reply. I'm aware of the torsional suspension units you described, and even own a pair. Yes, they are very stiff, so I changed my mind in favour of independent trailing/swing arm suspension with standard shock absorber units. The trailer is small because it will be pulled by a...
  3. EsoEng

    Suspension for trailer with wide loading range

    I'm designing a small trailer. Its unladen weight will be 50 kg, and fully laden weight will be 250 kg. I need a shock absorber solution to adequately suit both extreme loading scenarios. I have had difficulty identify one. How would a designer within industry solve this problem, please? I have...
  4. EsoEng

    Very basic beam problem

    Thanks again, both. @stilkikin, I've tried SolidWorks, FreeCAD, TurboCAD, Creo, Solid Edge, and Inventor over the past couple of days. They are all horrible. So horrible, in fact, that I came very close to doing away with the computer for engineering tasks altogether, and resorting to the ways...
  5. EsoEng

    Very basic beam problem

    @rb1957, weight is important, yes, as it's for a motorcycle, and weight jutting out at the rear could adversely affect handling stability. And yes, the bulk of the design is aluminium. I have analysed it, and it all looks strong enough other than where the lower arms mate with the vertical...
  6. EsoEng

    Very basic beam problem

    Thanks. The same to you! No, Ti bolts are not stronger than the stronger steel bolts, but they are lighter, and they are sufficiently strong for my hitch application, and they are stronger than 7075 aluminium, of course, and not excessively expensive. I was trained using base SI units, and...
  7. EsoEng

    Very basic beam problem

    @rb1957, I stepped back from the keyboard... I'm not really presenting myself very well here. However, I am starting to overcome my rustiness, which is the purpose of this embarrassing thread. It just takes me a little time to re-focus, and I am grateful for your help with this. I've been...
  8. EsoEng

    Very basic beam problem

    @rb1957, thanks again. I appreciate you taking the time. The lower arm design is inspired by a similar motorcycle tow bar design I found during background research. It is welded to the vertical plates. The upper arms are flat bars because they need to fit in-between the motorcycle twin mufflers...
  9. EsoEng

    Very basic beam problem

    @SWComposites, thanks. I have drawn FE diagrams, but have a confidence issue concerning how to define loads and constraints, as described in the OP. It is the interaction of the other bolts, and components the bolts pass through, that confuses me. @MintJulep, I am open to criticism, and even...
  10. EsoEng

    Very basic beam problem

    I am embarrassed to be posting this and asking for your help. I should know the answer. However, my knowledge is rusty, and my confidence shot. The problem: what is the maximum stress acting on each of the two bolts, as labelled in the diagram? (A third, lower, bolt connects the upper arm to...
  11. EsoEng

    Aluminium chassis design problem

    @rb1957, the Kevlar floor idea is interesting, but steel seems too heavy. As there are so many cross members, I feel an aluminium floor would be well supported, and well suited for filling-in the gaps between structural members. Heavy objects will not be small, so the floor (sheet) will not be...
  12. EsoEng

    Aluminium chassis design problem

    @rb1957, the riveting idea is now top of my list. It opens-up the project to a far wider selection of materials, and I won't have to rely on a welder (I can do the work myself). If, by facing, you mean a floor, then yes. Just sheet aluminium. The trailer will also have removeable sides, and a...
  13. EsoEng

    Aluminium chassis design problem

    @dvd, it's one metre wide, and less than two metres in length. It will have a maximum laden mass of 200 kg, and I'm allowing a maximum dynamic load of 5-times the mass. I am very conscious of fatigue issues with aluminium, which, of course, is a big concern. Thanks for the graph. Riveting is...
  14. EsoEng

    Aluminium chassis design problem

    To my knowledge, 7005 isn't available in extrusions. In fact, not many grades are. Is it standard that fabricators make most things from plate?
  15. EsoEng

    Aluminium chassis design problem

    I'm designing a chassis for a cargo trailer to be pulled by a motorcycle. It needs to be as compact as possible; there are severe limits on the thickness of the chassis, and the overall height, length, and width, and also weight, of the final trailer. With the above in mind, the image, below...
  16. EsoEng

    Material purchase calculator needed

    Many thanks. I'll give it a try. It looks like the just the thing I had in mind!
  17. EsoEng

    Material purchase calculator needed

    Is there a simple program that can automatically determine in the most efficient way how many x-metre lengths of square section extrusion are needed for a given design comprising multiple different lengths of the same square section? A program that can also take many different sheet steel sizes...
  18. EsoEng

    Error allocating requested memory

    I am running the 64-bit version, and am unable to complete ALGOR analyses within it. However, one way around this was to install VirtualBox, which allowed me to install the 32-bit version of XP within the 32-bit (an OS within an OS running as any other application). Within this 'virtual' 32-bit...
  19. EsoEng

    Error allocating requested memory

    I just installed VirtualBox, which enabled me to install XP-32 within XP-64. Once XP-32 was installed, I loaded ALGOR within it. I then ran the simulation and it works perfectly. I would still like to be able to run ALGOR within XP-64, of course.
  20. EsoEng

    Error allocating requested memory

    I also have the 'Error allocating requested memory'. I am using XP64 with 4-GB of RAM. Please could someone explain to me how I can solve this problem? I do not know how to access the 'Environment Variables' concerning Algor; neither do I know how to alter anything to do with ALGMEM.

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