KARI PROPRIETARY
Request for Proposal
for
Amplifier System for
Vibro-acoustic modulator
(
2010 년 11 월
한국항공우주연구원
우주환경시험팀
305-333 대전광역시 유성구 어은동 45번지
전화 : (042)860-2562 / 팩스 : (042)860-2234
KARI PROPRIETARY
FRP.SITC.KARI.KOREA 2010. 11. 24
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1. Overview of the project
1.1
Korea Aerospace Research Institute (hereinafter referred to as “KARI”)
is located at Daeduk Research Complex, 140 km south of Seoul.
1.2
KARI has a satellite assembly, integration and test center (hereinafter
referred to as “AITC”) as a research institutes for the purpose of the
effective development of domestic & scientific satellites.
1.3
In the AITC, for the acoustic test, the high intensity acoustic chamber
is operated and can generate the noise of 150dB OVSAL.
1.4
This acoustic chamber uses the low frequency source(WAS-3000) and
high frequency source (WAS-5000) to generate the acoustic noise.
1.5
The purpose of this project is to change the amplifier system for high
frequency source (WAS-5000).
1.6
The supplier should show that the amplifier & cooling system are well
operated with WAS-5000 modulator.
1.7
Acosutic performance data with WAS-5000 modulator should be
equivalent or better than that of WAS-5000.
1.8
The supplier should submit the bisiness showing of sales and
installation records for high frequency acoustic source and acoustic
chamber facilities.
1.9
The main undertakings of the project are to perform guarantee quality
and training, installation and site acceptance test etc.
1.10 All the descriptions in this RFP are minimum requirements and the
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supplier can suggest the better one to improve the overall
performance and cost. But in this case, the proposal should clearly
indicate the improvements from KARI’s requirements.
2. Procedure of the project
The project shall be proceeded with four parts as follows:
1) Supply for Amplifier & Cooling system
2) Transportation
3) Installation at KARI
4) KARI site acceptance test with acoustic modulator(WAS-5000)
3. Requisites of participants
3.1
The supply should submit the bisiness showing of sales and
installation records for high frequency acoustic source and acoustic chamber
facilities.
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4. Technical Requirements
For the acoustic facility, main components are :
- Reverberant chamber,
- GN2 supply & control system
- Acoustic horns & modulators
- Acoustic control system
- Monitoring & Safety system
Figure 1 shows a block diagram of a acoustic facility
Figure 1 Block diagram of a acoustic facility
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KARI acoustic chamber employ the two horns which have cutoff frequencies
of 25Hz and 125Hz are employed for acoustic impedance matching. Two
type of modulators are used to generate the sound. One is the WAS-3000
which is used at 25Hz horns. The other is WAS-5000 which is used at 125 Hz.
Figure 2 shows the acoustic noise sources of KARI.
Figure 2 Acoustic noise source in KARI acoustic chamber
Figure 3 shows the vibro-acoustic source of high frequency band(WAS-5000)
which is installed at KARI.
Figure 3 WAS-5000(High frequency vibro-acoustic modulator)
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The purpose of this project is to change change the amplifier system for
high frequency source (WAS-5000).
Figure 4 Amplifier system for WAS-5000
4.1 Amplifier specification
Drive output for one or two WAS-5000 modulator.
Volt amps : 12 kVA
Current max : 100 Amps rms
100% air-cooled, 480V/240, 3Ø Input
Remote control system
4.2 Cooling Unit specification
Cooling and Field Supply for one or two WAS-5000 transducers
Digital Indication of Field, Voltage and Current
Current max : 100 Amps rms
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Digital indication of Flow and Pressure
4.3 Amplifier & cooling unit system should be operated with vibrao-acoustic
modulator specified below[WAS-5000].
4.4 Specification of Modulator[WAS-5000]
Acoustic power output : 10 kW
Air flow rate for 10kW : 1,500 scfm
Air pressure required at exhaust plenum housing : 30 psi
Frequency response : 20 to 5000Hz (Maximum modulation up to
1250Hz)
Drive circuit maximum current : 60 amp rms(sine), 40 amps rms
(random)
Generate spectrum defined as an overall-SPL from 113dB to over
160dB at KARI acoustic chamber(Frequency range : 315Hz ~ 10kHz)
Table 1. acoustic noise capability of WAS-5000
4.5 Acosutic performance data with WAS-5000 modulator should be
equivalent or better than that of WAS-5000.
