Dynamic low tire pressure detection system for aircraft
First Claim
1. A dynamic low tire pressure detection system for detecting the presence of a low tire supporting a structural member of an aircraft and rolling on a surface comprising:
- first and second transducers mounted on the structural member for developing first and second signals having frequencies dependent upon the frequency of vibration of the structural member;
means for summing the first and second signals to develop a weight signal which is independent of the tilt of the structural member relative to a reference plane; and
means for deriving a tire pressure signal from at least one frequency component of the weight signal to obtain an indication of tire pressurization.
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Accused Products
Abstract
A dynamic low tire pressure detection system for detecting the presence of a low tire mounted on a structural member of an aircraft, such as a bogie beam or nose axle, includes a pair of inclinometers mounted on the structural member and adapted to sense the bend therein. The signals from the inclinometers are combined to generate signals representing the weight carried by the structural member. When the aircraft is moving, the weight signal is analyzed to determine whether particular frequency components are present therein. The amplitude of these frequency components are modified by a gain factor dependent upon a reference amplitude and are added to develop a tire pressure signal. The tire pressure signal is compared against a trip setting to determine whether the tire pressure is within acceptable limits. If the tire pressure is outside of the range of acceptable tire pressures, a signal is generated to warn of a potentially dangerous condition to the aircraft operating personnel.
31 Citations
14 Claims
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1. A dynamic low tire pressure detection system for detecting the presence of a low tire supporting a structural member of an aircraft and rolling on a surface comprising:
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first and second transducers mounted on the structural member for developing first and second signals having frequencies dependent upon the frequency of vibration of the structural member; means for summing the first and second signals to develop a weight signal which is independent of the tilt of the structural member relative to a reference plane; and means for deriving a tire pressure signal from at least one frequency component of the weight signal to obtain an indication of tire pressurization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A low tire pressure detection system for detecting the presence of a low tire which supports a structural member of a moving aircraft, the aircraft movement causing the structural member to vibrate, comprising:
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first and second accelerometers mounted on the structural member at opposite ends thereof for developing first and second signals; means coupled to the accelerometers for deriving a weight signal representing the weight carried by the structural member; first, second and third band pass filters, each coupled to the weight signal for developing first, second and third filtered signals containing low, middle and high frequency components, respectively, a variable gain amplifier coupled to the band pass filters for multiplying the amplitudes of the first and second filtered signals by a gain factor dependent upon the amplitude of the third frequency component to obtain first and second output signals; and means for summing the first and second output signals to obtain a tire pressure signal representing tire pressure. - View Dependent Claims (12, 13)
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14. A low tire pressure detection system for detecting the presence of a low tire which supports a structural member of an aircraft moving on a surface comprising:
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means, operatively connected to the structural member, for generating a frequency signal having a frequency component functionally related to the weight of the aircraft as the aircraft moves on the surface; means for deriving a tire pressure signal from said frequency component.
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Specification