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4015A Model 0858 Multi-Function Probes

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Goodrich Multi Function Probes now is widely use since offer less cost, less space and simplify the design stage.
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  Model 0858Multi-Function ProbesSENSOR SYSTEMS PRECISE PNEUMATIC MEASUREMENTS  > Pneumatic Measurements of Local Flow Angles up to ±45 Degrees> 0.2° Probe Measurement Accuracy DESCRIPTION The Model 0858 is a fuselage or boom-mounted all-weather Angle of Attack ( a)  and Angle of Sideslip ( b ) probe allowing precise pneumatic measurement of local flow angle. SPECIFICATIONS Electrical Heater Voltage: 115 VAC, 400 Hz or 28 VDCHeater Power: 370 Watts maximum Environmental Vibration: MIL-STD-810C, Method 514.2, Curve J, Equipment Category b.1 NORMALIZING (METHOD 1) Of the two normalizing methods, the recommended and most widely used (Method 1) is to use the ports on the sensing head to generate normalizing pressure signals. This method offers the definite advantage of eliminating special calibrations (as in Method 2) to account for differences in local conditions between the sensor and a remote point for q CN  and pitot pressure measurements.The differential pressure (P a 1  – P a 2 ) is proportional to the product of q CN  times a 1 ; where q CN  equals local pitot pressure minus local static pressure, and a 1  equals local angle of attack. Depending upon the parameters desired, the sensing ports may be configured as follows: Angle of Attack Configuration Figure 1 shows two ports, P a 1 and P a 2, located in the angle of attack plane. A third port, P 3 , is located in the center of the sensor head to provide a local pitot pressure source. The two ports, P 4 , are manifold together to provide an approximate local static pressure. Angle of attack ( a 1 ) can be determined using two differential transducers (or other instruments) which measure the outputs P a 1  – P a 2  and P 3  – P 4 , according to the relationship: P a 1  – P a 2   a 1  = ___________ (K 1  is a sensitivity coefficient) K 1  (P 3  – P 4 ) Angle of Sideslip Configuration As shown in Figure 2, this same configuration can be used to measure angle of sideslip ( b 1 ). By rotating the sensor head 90° about the axis of symmetry, the differential ports, P a 1  and P a 2 , now become located in the horizontal plane and are labeled P b 1  and P b 2 . The equation then becomes: P b 1  – P b 2   b 1  = __________ K 1  (P 3  – P 4 ) Angle of Attack and Sideslip Configuration Both angle of attack and angle of sideslip can be measured with a single probe configured as shown in Figure 3. In this case, the ports, P 4 , are replaced by P b 1  and P b 2 , (not manifolded together) with a correction term which averages the sideslip pressure P b 1  and P b 2 , instead of P 4 . Output signals (P a 1  – P a 2 ), (P 3  – P b 1 ), and (P b 1  – P b 2 ), are used in the following equations: P a 1  – P a 2   a 1  = ________________________________ K 1   [( P 3  – P b 1 ) + ( P b 1  – P b 2 )]  2 P b 1  – P b 2   b 1  = ________________________________ K 1   [( P 3  – P b 1 ) + ( P b 1  – P b 2 )]  2 NORMALIZING (METHOD 2) It is possible to use another source such as a pitot-static tube to measure q c1  for normalizing. The equations for MULTI-FUNCTION PROBES Figure 1:Angle of Attack ConfigurationFigure 2:Angle of Sideslip ConfigurationFigure 3:Angle of Attack & Sideslip Configuration  Weight per unit is 1.5 pounds maximumWeight per unit is 1.5 pounds maximum  All dimensions in inches angle of attack and/or sideslip are: P a 1  – P a 2  P b 1  – P b 2   a 1  = _________ b 1  = _________ K 2  (q c1 ) K 2  (q c1 ) SENSITIVITY COEFFICIENTS A further advantage of Method 1 is shown in comparing the two sensitivity coefficients (K 1  and K 2 ). The coefficient is a function of Mach number and remains constant for subsonic and supersonic speeds. Figure 4 shows that K 1  is greater than K 2  and is constant over a broader Mach range; changing substantially less than K 2  through M = 1.0. Also, K 1  is essentially constant for angles of up to ±45° compared to a range of about ±12° for K 2 . FOR ADDITIONAL INFORMATION To learn more about the Model 0858 Multi-Function Probes, call Goodrich at 952 892 4000. CONFIGURATION DRAWINGS Figure 4: Comparison of Sensitivity Coefficients K 1 (METHOD 1)K 2 (METHOD 2)  Goodrich Sensors and Integrated Systems 14300 Judicial RoadBurnsville, MN  55306-4898 USATele: +1 952 892 4000 Fax: +1 952 892 4800 www.goodrich.com/sis4015A LIT 1/10 The Goodrich name, logotype and symbol are trademarks of Goodrich Corporation.
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