Standards for Using Airplane Coordinate Systems
Standards for Using Airplane Coordinate Systems
(OP)
I'm looking for standards, industry or corporate, that define the use of Airplane Coordinate Systems inside of CAD, CAM, and FEA programs.
It has been a long while since I used ACS and I'm now in the position where they would benefit a significant number of product designs I'm working on. Rather than re-invent the wheel from my fading memory, I'm looking for leads to standards I can review to create my own company standard on the technique and use of airplane coordinate systems.
Does anyone have a link, lead, or document they can share?
It has been a long while since I used ACS and I'm now in the position where they would benefit a significant number of product designs I'm working on. Rather than re-invent the wheel from my fading memory, I'm looking for leads to standards I can review to create my own company standard on the technique and use of airplane coordinate systems.
Does anyone have a link, lead, or document they can share?
--Scott
www.wertel.pro





RE: Standards for Using Airplane Coordinate Systems
x aft, y stbd, z up
or
x aft, y port, z down
Quando Omni Flunkus Moritati
RE: Standards for Using Airplane Coordinate Systems
Steve R.
RE: Standards for Using Airplane Coordinate Systems
Vehicle-carried orbit-defined axis system
A system with the origin fixed in the vehicle, usually the center of mass, in which the zo-axis is directed from the spacecraft toward the nadir, the yo-axis is normal to the orbit plane (positive to the right when looking in the direction of the spacecraft velocity), and the xo-axis completes the right-hand system. (See Figure 1A.)
n.b. xo is in the direction of the velocity vector from Figure 1A
Note that this is one of 11 coordinate systems listed in the document.
TTFN

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RE: Standards for Using Airplane Coordinate Systems
Quando Omni Flunkus Moritati
RE: Standards for Using Airplane Coordinate Systems
The standard axes for surface ships are shown in Figure 1. The roll axis for surface ships is the x-axis. It is oriented along the centerline of the ship, running forward and aft. Longitudinal dimensions are measured along or parallel to this axis. The pitch axis is the yaxis. It runs transversely port and starboard. Besides being the axis for pitch, transverse dimensions are measured along or parallel to this axis. The yaw axis is the z-axis. It runs vertically and dimensions are measured along or parallel to this axis.
Figure 1 shows positive x pointing aft, and positive y pointing port. Since ships have a similar "station" terminology as airplanes, this might be more appropriate. The above is from INTERNATIONAL SOCIETY OF ALLIED WEIGHT ENGINEERS, INC, RECOMMENDED PRACTICE NUMBER 13 Standard Coordinate System for Reporting Mass Properties of Surface Ships and Submarines
TTFN

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RE: Standards for Using Airplane Coordinate Systems
The first part is more or less answered. I remember reading a specification a long time ago that missiles point right, cars point left, etc. etc. And I know that zenith/nadir is waterline, port/starboard is butt line, and forward/aft is station line. But I was interested in knowing if modeling in the Z-axis is always zenith/nadir or if the Y-axis is.
That leads to the second part of the question. What CAD standards are followed to actually implement successful use of airplane coordinate systems?
For example, one ASME drafting standard says that the "front" view should show the most detail of the part. But that orientation may not be pointing FWD on an aircraft. I want to model the component part symmetric about the local coordinate system (default CS/orthographic planes in a solid CAD model), but I need to be able to relate it to the part's position in airplane coordinate system (ACS).
Do I have to manually perform the CS transform and create a coordinate system in each part file? I can't imagine that being sustainable. For example, if I lengthen a mating part by an 1/8 inch. Every single consecutive part would require a new ACS transform.
Is there even much benefit in a modern solids modeling (master model concept) system to use ACS?
--Scott
www.wertel.pro
RE: Standards for Using Airplane Coordinate Systems
Back in my drafting board days, I marked station numbers all over some complex optical systems I was working on. I need a precise definition of the position of everything, and the station numbers provided it. I have not done this on CAD.
What problem is it you are trying to solve?
--
JHG
RE: Standards for Using Airplane Coordinate Systems
Trying to do this on CAD.
--Scott
www.wertel.pro
RE: Standards for Using Airplane Coordinate Systems