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  1. DerGeraet

    Rotorcraft Limit manoeuvring load factor

    Tnx for the input WKTaylor! Do you know where to find this document? I couldn't find it via google :/ Well you are right, flight data also shows that the value of -0.5g is never exceeded but since the flight vehicle has a composite-primary structure, I am doing the analysis more conservative, I...
  2. DerGeraet

    Rotorcraft Limit manoeuvring load factor

    Hi community, currently I am doing some structural analysis with loads resulting from required Limit manoeuvring load factor. In CS VLR.337 following requirement is listed: The rotorcraft must be designed for- (a) A limit manoeuvring load factor ranging from a positive limit of 3.5 to a...
  3. DerGeraet

    Strength calculation of rotorcraft structures

    Hi @ all, I'm a stress eng. with approx. 1 year experience but only on fixed wing AC. Since I have a new job, where we produce some rotorcraft UAV's, I have to do stress calculations of each part of the rotorcraft. Unfortunately I couldn't find any literature dealing with the topics of stress...
  4. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    unfortunately not :D just the results of the equations.. I'm trying to get the book and go trough the derivation of such examples, so I'm goint to order it soon. it's a german book FYI...
  5. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    hi guys, sorry for my late reply, just came home... I could talk to the guy who has calculatet this part with the strange results et voila, he used a table for that... unfortunately I've left the table at the company but I promise that I will post it tomorrow. and thank you for the answers...
  6. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    my bad, sorry .. i will call it "fixing points" in the future :) i can't figure out what you mean with "doubly reduntant"...
  7. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    The supports at 1 and 7 prevent translation in horizontal and vertical direction. Normaly, the momentum at these supports has to be 0 but as you can see in the "torque path", it isn't. Also in the FEM-analysis the momentums were not 0 at the supports. The disabled DOF's in the FEM where...
  8. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    I hope my question and the problem is clear in the new attachement. I found this file for the displacement method http://www.sut.ac.th/engineering/Civil/CourseOnline/430332/pdf/03_SlopeDeflection.pdf The example is almost the same. But what I don't understand is the way of analyzing this part...
  9. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    Hi guys, I just came home. I will give you an answer as soon as possible, so within the next hour(s). thank you for the answers! @BAretired they are both "solid bearings" (so 2 DOF, one in horizontal and one in vertical direction). this is why the system is indeterminate to the first degree.
  10. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    so, I've tried it with the symm. axis. there is still the problem, that there are no horizontal forces. in the first attachment from my first post, you can see that the horizontal forces H1 and H7 do exist... in this attachment are the "solution" with the symm. axis. I've compared the results...
  11. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    oops sorry, wrong quotes at the post above.. No it isn't. I have calculated this part in an FEM program and wanted to check the results by calculating it analytically. This is what I've found at the company for this kind of systems. It provides the same analysis as I need but I don't understand...
  12. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    @rb1957 i think my answer was to quick :) No it isn't. I have calculated this part in an FEM program and wanted to check the results by calculating it analytically. This is what I've found at the company for this kind of systems. It provides the same analysis as I need but I don't understand...
  13. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    thank you all for your quick replies. @rb1957 as BAretired mentioned, it is called "indeterminate to the first degree". I didn't know the exact term of it, sorry. @BAretired F2 is acting directly in the middle of the system, the symmetrical axis. of course i do know that the vertical forces...
  14. DerGeraet

    Analysis of a hyperstatic system by hand calculation

    Hi, I'm currently trying to solve the problem, attached to the pdf-file. It's a hyperstatic system due to the fact that it's connected by two solid bearings (2 DOF*2). The forces in the horizontal direction, H1 and H7, are calculated but the vertical forces are kind of replaced? by K. Force F2...

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