Re: MADEFAST Design, Trdeoffs, and Affordability Ruzena Bajcsy <firstname.lastname@example.org>
To: dwhitney@MIT.EDU (Dan Whitney)
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Subject: Re: MADEFAST Design, Trdeoffs, and Affordability
In-reply-to: Your message of "Mon, 07 Mar 1994 08:23:15."
Date: Mon, 07 Mar 1994 08:47:31 EST
From: Ruzena Bajcsy <email@example.com>
>>I'm glad to see the "design" part of the program starting to take some
>>shape. I'd like to add some other considerations that may stretch the
>>group a little but are a basic part of realistic design and may get
>>The specifications for a seeker include pointing accuracy and bandwidth.
>>These together mean that it should be able to find and lock onto a
>>target and keep hold of it even if it moves rapidly. It should also be
>>able to report the target's heading in two angle dimensions accurately,
>>both when the target is apparently stationary and when it is moving. It
>>should also be able to do this when the target is dim and hard to
I could not agree with you more!!!
>>These requirements "flow down" to particular design parameters like
>>gimbal motor torque, servo gain and damping, gimbal stiffness and mass,
>>rate gyro sensitivity, bearing runout, sensor sensitivity (hence size
>>and weight), and assembled tolerances (do the two gimbal axes intersect?
>>do they intersect at the center of the sensor, etc.)
>>There is an overall diameter and weight limit as well. These limits
>>make it hard to meet the requirements above. A cost limit will be even
>>harder to meet.
>>Altogether this mixed set of requirements will require tradeoffs to be
>>made between cost and performance. This is a basic trade which is
>>little practiced in DoD work, though it is the main driver in commercial
>>work. Developing collaborative tools to do tradeoffs would be a big
>>contribution as DoD strives to define what "affordability" means.
All above what you said is so much true and offers beatifull design research