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ASE 167M - Lectures Compiled

ASE 167M - Lectures Compiled - ASE 167M Lecture One...

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ASE 167M Lecture One Aircraft Systems I Flight 1 Briefing
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Lecture #1 09/18/11 ASE167M – Apurva Chunodkar 2 Lab Administration Labs Temporary schedule posted online Attendance will be taken during your lab Reports Individual work on all lab reports Due two weeks after assigned Use data collected during your lab Submit flight cards with TA’s signature Sample lab report is available on BlackBoard Lab report due on Wednesday 4 pm in class
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Lecture #1 09/18/11 ASE167M – Apurva Chunodkar 3 Today’s Lecture Aircraft Instruments Pitot-static Systems Bernoulli’s Equation Airspeed Definitions Basic Aircraft Systems Flight 1 Briefing
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Lecture #1 09/18/11 ASE167M – Apurva Chunodkar 4 Aircraft Instruments Pitot-type Airspeed Indicator Altimeter VVI Gyroscopic Attitude Indicator Turn Coordinator Heading Indicator
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Lecture #1 09/18/11 ASE167M – Apurva Chunodkar 5 Pitot-Static Systems Essential requirements in the measurement of a/c performance are The state of the atmosphere The relative motion between the aircraft and the air mass Of the primary flight instruments (altimeter, airspeed, VVI, HSI, compass, turn coordinator), the first three use the Pitot-static system The Pitot-static systems drive instruments (mechanical movement of a pointer) that use the difference between the static and total pressure, or just static pressure (independent of electrical power supply) System includes a Pitot tube for measuring impact (ram) pressure, and static ports for measuring barometric static pressure.
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Lecture #1 09/18/11 ASE167M – Apurva Chunodkar 6 Pitot-Static Systems Feb. 6 th , 1996 – Birgenair Flight 301 crashes shortly after takeoff due to the Pitot tube being blocked and thus causing the system to provide incorrect airspeed data. October 2 nd , 1996 – AeroPeru Flight 603 crashes because of blockage of the static ports. The static ports on the left side of the aircraft had been taped over while the aircraft was being waxed and cleaned. After the job was done, the tape was not removed.
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Lecture #1 09/18/11 ASE167M – Apurva Chunodkar 7 Bernoulli’s Equation Total pressure at a given point is that which would exist if the flow were slowed down isentropically to zero velocity. Assumptions? Isentropic Incompressible Derived from Newton’s 2nd Law (F = ma) ( 29 2 1 2 1 2 1 2 1 . 1 2 T P P V P V P const along streamline ρ ρ - = + = = Static Pressure Dynamic Pressure Total Pressure V1,P1 V2=0 P2
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Lecture #1 09/18/11 ASE167M – Apurva Chunodkar 8 Airspeed Indicator Airspeed Indicator Displays difference between Pitot (impact) pressure and static pressure Pressures are equal when airplane is parked on ground in calm air Indicated Airspeed Uncorrected reading from the airspeed indicator Include factors as: position errors, instrument errors, compressibility effects, density changes, etc…
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Lecture #1 09/18/11 ASE167M – Apurva Chunodkar 9 Airspeed Definitions Indicated Airspeed As measured by airspeed indicator
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