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  • Users: heitor
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  1. heitor

    Landing gear load factor versus aircraft size

    Based on my memory, there is a bibliographic reference containing a list of the landing gear load factors for several aircraft, ranging from small ones like the Piper Comanche to the big transport planes like the DC-10. Could you please help me to find out which book/article/report I can find...
  2. heitor

    Sizing the landing gear of a small airplane

    I have a question about sizing a spring landing gear of a small airplane. If I am reading the regulations correctly, FAR 23.723 requires drop tests for both takeoff and landing weights. However, I can’t imagine why I should design the landing gear to withstand a MTOW landing. After reading the...
  3. heitor

    Den Hartog - Mechanical Vibrations

    The book is available online: http://www.archive.org/details/mechanicalvibrat031556mbp
  4. heitor

    Wanted: a book with a chapter on moment of inertia measurement

    Hello!!! Once I had a book with a chapter dealing with experiments to measure moments of inertia. But I can't remember the name of the book nor its author. Any ideas? Thank you.
  5. heitor

    Elastic curve of a spring supported beam

    Hello. I'd like to validate a finite element code using a spring supported beam. It's a beam with a spring at each side. I'd like to find the elastic curve of this beam, but my memory betrayed me. I forgot how to get this equation. Maybe by superposition? At first I would find the elastic...
  6. heitor

    VIBLAB from Dimarogonas Vibration for Engineers

    Hello. I've just bought an used copy of Vibration for Engineers written by Andrew Dimarogonas. But the VIBLAB software was not with the book and the ftp address given in the book is not good today. Please, could someone share one copy with me? If it is piracy, please forget my stupid question...
  7. heitor

    Needed: 6014 and 1014 data

    Hello. I am looking for the following data: - Number of balls, inner groove radius and outer groove radius for the 6014 ball bearing - Number of rollers and roller length of the 1014 roller bearing Please, could you help me? Thak you!
  8. heitor

    antiresonances at the critical speed

    Hello. I'm working with an horizontal rotor that has three planes of measure, one at one bearing and the other two at the shaft. Each plan has two transducers, one at the horizontal direction and the other at the vertical direction. When the rotor is driven beyond the first forward critical...
  9. heitor

    Differences between the run up and run down in a rotor

    Hello. I'm working with a rotor and after balancing I am able to go beyond the first critical speed. I noted that the recorded response (order tracking) of the displacement probes are different for the run up and the run down tests. The run down response gives me lower levels of vibration than...
  10. heitor

    Stiffness matrix for bearings

    Hello. I'm looking for the stifness matrix (5x5) of the 6014 and the 1014 bearings. Even the load deflection curve for these bearings would be useful. Please, could you help me? Thank you!
  11. heitor

    Displacement from accelerometer signal

    Hello. I'd like to have your advice about the integration of the acceleration signal to obtain the displacement. I tried to integrate in the frequency domain by taking the fft of the acceleration signal, dividing it by -omega^2 and the displacement should be the inverse fft of the result...
  12. heitor

    New to orbit analysis

    Hello. I'm looking for some info/texts/books on orbit analysis and rotating machine diagnostics. Could you give me some sugestions? Merry Christmas! :)
  13. heitor

    Free software to do rotor balancing

    Hello. I'm looking for a free software able to do 1 plane and 2 planes balancing. Do you know if it exists? Thank you!
  14. heitor

    Sinus measures in IDEAS 9.1

    Hello. I am using Ideas Test to study the dynamical behavior of a rotating machine. I want to take the measures at several spin speeds. I can do it by using the "Standard Measurements", but for each spin speed I have to store the measurements in a data file. That is, I put the machine...
  15. heitor

    Modal balancing of flexible rotors

    Hello. I'm studying the modal balancing of flexible rotors and I found a small problem with this technique. I found strange modelling the rotor as a non-rotating structure, i.e., neglecting the gyroscopic matrix, to find the modal shapes. So my question is: the mode shape of the rotor at the...
  16. heitor

    Eigendata problem

    Hello. In a model have a fixed-free beam that supports a reservatory at the free side. If I could evaluate the first frequency of the system (beam+reservatory) by using only the eigenvalues and eigenvectors of the beam, it would save me a lot of time since the reservatory can work with several...
  17. heitor

    Data for two plane balancing software

    Hello. I developed a software to calculate the correction mass and its position for balancing a rotor. It uses the two plane method with influence coefficients. I need to validate it, could you help me with some experimental data? Thank you!
  18. heitor

    Trial mass for balancing rotors

    Hello! Do you know any "rule of the tumb" to choose the trial mass for balancing rotors? Thank you!
  19. heitor

    Geting a graphic to use it on a report

    Hello! I have a plot that cames from I-DEAS Test and I would like to use it on a report. Doing a screen capture gives an ugly picture and exporting to a CGM file doesn't give a good picture at all. So what do you do when you need to use the pictures in another software? Thanks!
  20. heitor

    Bearing drawings

    Hello! I'm looking for a exploded view drawing of a ball bearing and a roller bearing. Do you know where to find it? Thank you!

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