Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: franck
  • Content: Threads
  • Order by date
  1. franck

    Allen variance (oscillator stability) measurement/estimation errors

    Dear all, Once again I would need some of your lights on the following problem. Really, I have to assess the stability of an oscillator. To do this, I have used a very stable oscillator (MASER) and I have compared its frequency to my oscillator through a frequency counter (sampling performed...
  2. franck

    Aluminium Peel Shim

    Hi guys, I am wondering if some of you have the approximate value of the compression modulus of an aluminium peel shim. Really, I am going to fill in some gaps with these shims and I am going to take into account their deformation under preload since they seem quite flexible. Best regards, Franck
  3. franck

    Book dealing with polarization mismatch loss

    Hi all, I am wondering if someone could point me to a book or an article, which demonstrates the general equation dealing with the polarization mismatch loss between two ellipses. I have the equation but I would like to understand how it is derived. Best regards, Franck
  4. franck

    Question on Hard Brass

    Hi all, Once again I would need your light. Really, I received an antenna drawing (which will go to space) made of Hard Brass. I have to perform some mechanical and thermal analysis and I had a look in my book to get the mechanical properties but I have data for the following: Red Brass (85%...
  5. franck

    Basic radiation problem

    Hi all, I am wondering if someone has the analytical solution (or point me to a reference book) of the following thermal problem: I have a beam of cross section (Ac), conductivity (lambda), length (L), exposed area to space (As) and finally with an emissivity of 0.8. One end of the beam is...
  6. franck

    High Strength Alloy steel used for a low temperature application

    Hi guys, Once again I would need your point of view. Really, I have an application for which I need to use high strength screws to connect some 6061-T6 aluminum plates. I selected the following ones: Holo-Krome 1960 series (high grade alloy steel hardened and tempered). My problem is that...
  7. franck

    Coffin-Manson Equation for an adhesive

    Hi all, I would like to qualify our bonding process for the heaters that are going to remain permanently attached on a Spacecraft. I am trying to calculate an Acceleration Factor for the adhesive (Scotchweld 3M). Currently I am guessing a Coffin-Manson exponent of 6 but I am not convinced if...
  8. franck

    control of over pressure in a waveguide assembly

    Hi all, To avoid condensation within my waveguide (kind of pipe) assembly, I have to inject N2 gas. However, I have some very sensitive hardware attached to my waveguide (pressure window) which can hold a big pressure. Thus, I have a tight requirement to inject that GN2 in the pipe not to...
  9. franck

    Seismic Loading

    Hi guys, I am a spacecraft designer and I need to take into account a seismic loading to size a structure that is holding my spacecraft. Basically I have an article "Proposed Canadian Code Provisions for seismic design of elements of structures, non-structural components, and equipment". In...
  10. franck

    Outgassing data for Iridite 7p

    Hi all, I am planning to use Iridite 7p per MIL-C-5541 to coat my copper waveguide. The issue is that those waveguides have to go in a thermal vacuum chamber so the outgassing of the coating must be low. Does anyone know if that coating has already been used for a space application and where I...
  11. franck

    Venting Analysis

    Hi all, I have to perform a venting analysis to determine how many holes I have to introduce in my waveguide assembly so that there is not a big pressure differential when the assembly is going through vacuum (it is space application). I have one article dealing with Venting Analysis, 'Venting...
  12. franck

    Belleville washers to keep preload under thermal variation

    Hi all, I have an application for which I have to keep my preload over a wide range of temperature. Basically, I am preloading a glass-reinforced shim with some Ti6Al4V titanium fasteners. This assembly is going to experience a temperature variation of 160C (from ambient to –140C). The...

Part and Inventory Search

Back
Top