Air Data Computer System 大气数据计算机系统

航空

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gongweixiang

                           

diguo

嗯好东西。好好学习一下哈

erics8482

顶一个！！！

wwwronin

非常感谢，很需要呢

航空

1
NBAA 2003
Civil Aviation Flight University of China
Air Data Computer System
大气数据计算机系统
Aiirr Daattaa Coomppuutteerr SSyysstteem((ACDSS))
2
NBAA 2003
Civil Aviation Flight University of China
The ADC takes inputs from the pitot and static pressure sources, converts them
to electrical signals, and then transmits them via a data bus to the various flight
instruments.
In addition, input from the outside air temperature probe is used to calculate
the true airspeed. In some later models of ADC, angle of attack (alpha) sensor
inputs are also provided.
Normally there will be two ADCs to provide redundancy, each pilot being
able to switch to the output of the other ADC. Outputs from the ADC go to the
altimeters, VSI, and ASI/ Mach meter.
In addition, outputs are fed to such systems as the flight director (FD), automatic
flight control system (AFCS), flight management computer (FMC), ground
proximity warning system (GPWS), the flight data recorder (FDR) and others.
Aiirr Daattaa Coomppuutteerr SSyysstteem((ACDSS))
3
NBAA 2003
Civil Aviation Flight University of China
Pitot
Static
Temp
LADC R ADC
Pitot
Static
Temp
Capt
ADC
alternate
F/O
ADC
alternate
Capt
ALT
VSI
ASI
F/O
ALT
VSI
ASI
FD AFCS FMC GPWS FDR
and
others
Aiirr Daattaa Coomppuutteerr SSyysstteem((ACDSS))
4
NBAA 2003
ADC
Pitot Pressures
Static Pressures
Total Air Temperature
Angle of Attack
Instruments
Systems
5
NBAA 2003
Civil Aviation Flight University of China
Figure 1.2
Inputs
Static Pressure
Computer Outputs
Altitude
Hold
Altitude
Indicated
Airspeed
Mach
Number
True
Airspeed
Static
Air
Temperature
Air
Density
Density
Static
Air
Temperature
True
Airspeed
Mach
Number
Dynamic
Pressure
Pitot
Pressure
Pitot Pressure
Transducer
TotalAir Temperature
Systems Using ADC Outputs
Automatic Thrust Control
Cabin Pressurisation
Flight Management
Flight Recorder
Flight Director
Automatic Flight Control
Altitude Reporting
GPWS
Stall Warning
Transducer
Altitude
Memory
Static
Pressure
Annaalloogguuee aannddDiiggiittaallADCss
Loss of air data input activates a
warning logic circuit within the
ADC, which causes warning flags to
appear on the associated indicators
and annunciators to illuminate on the
computer control panel.
Air data computers are usually of
the digital type; that is, they transmit
data in digital format which is
compatible with other computerbased
systems. Analogue air data
computers, which transmit their
output data to servo-operated
devices, are less common, although a
few are still in existence.
6
NBAA 2003
Civil Aviation Flight University of China
Mach/airspeed Indicator
The instrument receives its information from its associated air data computer,
and presents airspeed against a single needle, and both Mach and airspeed in
digital displays.
AiirrDaattaa IInnssttrruumeennttss
7 8
7
285
60
80
100
120
140
160
200 180
250
300
350
400 MACH
KNOTS
PULL TO SET
IN
VMO OP
M
Man ua l Mo de Fl ag
Max Ai r sp e ed Poi nt e r
VMO Fl ag
Comman d
Ai r s pe ed Bu g
Ai r sp e ed Po i nt e r
Comman d Ai r s pe ed Kno b
Manu a l Se t (Pu l l Out )
Pe r f .Da t a Compu t e r
(Pu sh In )
Ai r sp e ed
Command
Ai r s pe ed
Ino p Fl ag
Ex t e rn a l
Ma rk e r
Ma ch
Figure 1.4
7
NBAA 2003
Mach/airspeed Indicator
8
NBAA 2003
Civil Aviation Flight University of China
The striped needle (barbers pole) shows the maximum permitted airspeed
(VMO). The Mach display is normally blanked out at low Mach numbers, typically
below M 0.4. The five little bugs mounted on the external face of the instrument
are manually positioned, and are used to remind the pilot of various significant
speeds, such as V1, V2, flap retract speeds and so on.
AiirrDaattaa IInnssttrruumeennttss
7 8
7
285
60
80
100
120
140
160
200 180
250
300
350
400 MACH
KNOTS
PULL TO SET
IN
VMO OP
M
Man ua l Mo de Fl ag
Max Ai r sp e ed Poi nt e r
VMO Fl ag
Comman d
Ai r s pe ed Bu g
Ai r sp e ed Po i nt e r
Comman d Ai r s pe ed Kno b
Manu a l Se t (Pu l l Out )
Pe r f .Da t a Compu t e r
(Pu sh In )
Ai r sp e ed
Command
Ai r s pe ed
Ino p Fl ag
Ex t e rn a l
Ma rk e r
Ma ch
Figure 1.4
9
NBAA 2003
Civil Aviation Flight University of China
The command airspeed knob sets the commanded airspeed bug, to which the
autothrottle will respond when engaged; this command airspeed is also fed to the
air data computer, to govern the FAST/SLOW display on the attitude indicator. If
the ADC fails, the digital readouts of Mach number and airspeed will be covered
by a flag, and the airspeed pointer will read zero.
AiirrDaattaa IInnssttrruumeennttss
7 8
7
285
60
80
100
120
140
160
200 180
250
300
350
400 MACH
KNOTS
PULL TO SET
IN
VMO OP
M
Man ua l Mo de Fl ag
Max Ai r sp e ed Poi nt e r
VMO Fl ag
Comman d
Ai r s pe ed Bu g
Ai r sp e ed Po i nt e r
Comman d Ai r s pe ed Kno b
Manu a l Se t (Pu l l Out )
Pe r f .Da t a Compu t e r
(Pu sh In )
Ai r sp e ed
Command
Ai r s pe ed
Ino p Fl ag
Ex t e rn a l
Ma rk e r
Ma ch
Figure 1.4
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NBAA 2003
Mach/airspeed Indicator
11
NBAA 2003
Civil Aviation Flight University of China
Altimeter
The electric servo altimeter is driven by its associated air data computer. The
display has both a needle and a digital readout, the needle turning once per
thousand feet. The digital display is blanked if ADC information is unreliable, or if
power is lost.
Figure 1.5
AiirrDaattaa IInnssttrruumeennttss
M B I N . H G
AL T
1
2
3
6 5 4
7
8
9
0
BARO
1 0 1 3 2 9 9 2
31 7 0 0
100 Feet Pointer
Baro Knob
Altimeter Settings
ALT Indicator
12
NBAA 2003
Altimeter
13
NBAA 2003
Altimeter
14
NBAA 2003
Altimeter
15
NBAA 2003
Altimeter
16
NBAA 2003
Civil Aviation Flight University of China
Vertical Speed Indicator
The vertical speed indicator (VSI) receives its information from its associated
air data computer, and may show an OFF flag if the data is unreliable or if power
is lost. Modern VSIs, called IVSIs, are fitted with an inertial mechanism to
improve response times.
Figure 1.6
AiirrDaattaa IInnssttrruumeennttss
VERTICAL
SPEED
1000 FPM
1 2
4
6
1 2
4
0
.5
.5
OFF
17
NBAA 2003
Vertical Speed Indicator
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NBAA 2003
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NBAA 2003
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