COMMERCE BUSINESS DAILY ISSUE OF JULY 19,2000 PSA#2645 Aviation Applied Technology Directorate, U.S. Army Aviation and Missile
Command, Attn: AMSAM-RD-AA-C, Building 401, Lee Blvd, Room 117, Fort
Eustis, VA 23604-5577 A -- RSEARCH AND DEVELOPMENT, BROAD AGENCY ANNOUNCEMENT SOL
DAAH10-00-R-0005 DUE 080300 POC Ms. Beth Jackson, Contract Specialist,
Phone Number (757) 878-0086 E-MAIL: Aviation Applied Technology
Directorate, Ft. Eustis,, ejackson@aatd.eustis.army.mil. This is an
Amendment to the Broad Agency Announcement DAAH10-00-R-0005 posted on
the CBDnet June 13, 2000 and printed in the Commerce Business Daily
issue dated June 16, 2000. The following are questions received on
TOPIC 02-00 ROTATING/NONROTATING INTERFACE FOR DATA AND POWER, and the
responses. QUESTION 1. Conventional sliprings are historically
unreliable and would need short-term replacement. Technology solutions
must address non-contacting mechanisms that provide bi-directional
data and power transmission. Should this be interpreted to mean that
all contacting mechanisms are viewed as "unreliable and in need of
short-term replacement"? Are innovative contacting mechanisms of
interest to the Army? RESPONSE: The statement that "conventional
sliprings are historically unreliable and would need short-term
replacement" is based on experience with conventional sliprings. The
statement that "Technology solutions must address non-contacting
mechanisms" is intended to show a preference to technology solutions to
overcome the shortfalls of conventional sliprings, and is not to be
interpreted that successful technology solutions must ONLY address
non-contacting mechanisms. If an offeror has "innovative contacting
mechanisms" to propose, the Army will consider them if they provide a
technology solution that convincingly overcomes the reliability and
maintainability limitations of conventional sliprings QUESTION 2. The
solicitation states that " power across the fixed/rotating interface is
also required (28v DC and 115v, 400hz AC) ." Some current fielded
systems require 3-phase power. Is this anticipated for future Army
requirements? RESPONSE: Since some current fielded systems require
3-phase power, it is anticipated that some future fielded systems will
also require 3-phase power capabilities and that the desired
fixed/rotating power interface must be accordingly designed. QUESTION
3. What is the Government's estimate of the level of power consumption
to be addressed? RESPONSE: There is no set design specification for
the power requirements of future active rotor systems, since there are
a number of varied concepts. However, several current design
activities estimate levels of power consumption may be up to 1000V,
1500W for active rotor actuation, assuming rotating system voltage
amplification and high-efficiency drive system that can deliver AC
commanded signals to the individual blades. QUESTION 4. The
requirements for a 32 bit throughput for data is very high. What is
driving this requirement? Is a throughput of 12-16 bit acceptable if it
meets data requirements? RESPONSE: The requirement for a 32 bit
throughput for data may be considered high; however, data with 32 bit
resolution is not uncommon and has been a requirement in some cases
(for example, ARINC 429 WORD and the 1553 Bus) since the 1970's. The
driving factor for this requirement is the ability to sample data and
encode the resulting information at a sufficient resolution to enable
high performance in the design of future systems. Throughput of 12-16
bit is not acceptable as it does not meet the potential requirements of
future systems. ALL OTHER TERMS AND CONDITIONS REMAIN UNCHANGED. Posted
07/17/00 (W-SN475506). (0199) Loren Data Corp. http://www.ld.com (SYN# 0002 20000719\A-0002.SOL)
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