3815. Defending Mass Properties
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Paper
Abstract
The mass properties profession as viewed by outsiders is a simple job, even not seen as true engineering, a glorified accounting job. As seen from the inside, we who endeavor to perform mass properties as a career know that mass properties is simple is not the case. This dichotomy of views hinders our ability to perform our function, lowers our perceived value, and even threatens our very existence on programs. This problem stems from bias and ignorance from those who aren’t intimately familiar with our capabilities and the perception that two equations are the foundation of mass properties.
The first equation is
This equation has two consequences, first it equates mass and weight, and secondly the equation
cements the mindset that the role of the mass properties practitioner is that of a weight accountant.
The second equation is:
W=ρV
or simply put weight equals density times volume. Although true, this is only applicable in limited
situations that a mass properties engineer encounters, yet this limited aspect is not thought about
by most people, even in engineering. The equation applies to most structural elements, such as a
strut or a beam, but is inapplicable when an item is made of multiple components such as an
electronic box. Moreover, these equations completely ignore other aspects of mass properties
engineering such as determination of Centers of Gravity and Inertia, as well as reporting,
controlling mass properties, and verification activities.
This paper will use the author’s own experience with interactions with personnel he has
encountered in his career and present ways to counter the “Mass Properties is Simple” mindset
to make believers out of mass properties skeptics.
