pressure error

pressure error

An error in pressure instruments such as an ASI (air-speed indicator) or an altimeter caused by false static pressure at the static port of an aircraft in flight. Also known as installation error or position error
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We compare the absolute value of the pressure error field ([P.sub.abs] = [absolute value of [P.sub.analysis] - [P.sub.fnl]]) of the two experiments and give the difference field of the pressure error [DELTA]P ([DELTA]P = [P.sup.feature.sub.abs] - [P.sup.regular.sub.abs]).
Figure 20 shows the control surface for implementing MFs for static air pressure error values as well as fuzzy rule-implemented change of error values.
* original maps used for calculating the FF contribution are affected by uncertainties that cannot be managed without feedbacking the pressure error between desired and actual pressures.
Summary of Pressure and CA Error Effects Summary of Error Type Pressure Error CA = Crank Angle) and CA Error Effects CA Offset 1[degrees] Pressure 1% Pressure Offset 1% Scalar MEP IMEP 3-6% none 1% PMEP 3-6% none 1% MFB CA50 ~1[degrees] none none BD1090 ~0.5[degrees] none none
w.c.) pressure error threshold [[DELTA]OS.sub.max] Maximum number of 7 changes in OS during the previous 60 minutes (moving window) ModeDelay Time in minutes 90 to suspend fault condition evaluation after a change in mode AlarmDelay Time in minutes 60 that a fault condition must persist before triggering an alarm Table 4.
Figure 2 shows the -0.3% to +1.1% possible static pressure error that can occur if the tap holes are beveled or rounded.
GPS elevations are available, but can have modest errors (typically [+ or -] 10 m, roughly equivalent to a 1-hPa pressure error, the typical error variance used in most operational data assimilation systems; see http://gpsinformation.net/main/altitude.htm for a discussion on the vertical errors in GPS-based elevation).
The pressure error will also contribute to the error although to a lesser extent since the part of the calculation that uses pressure is linear, while the part that uses temperature is for the most part exponential.
Firstly, we look for more promising norms to measure the pressure error with improved LBB dependency.
The incorrect Swiss reference was simply a deadline pressure error which we are happy to correct.
The pressure error was discovered by the analysis contractor, and Calspan agreed to run another sample at 125 psig (862 kPa), the correct inflation pressure.