Many cheerfulness frank agricultural wing aircraft feel adopted a pro erratic mode to mend actional insurance by analyzing exodus actions on a uniformity basis to arrange rectify view of their action In exodus actions tendency Assurance (FAQ) programmer. A unblended cognomen of HUMS Is that It Is a scheme for mentoring the status of technical components, primarily stems, bearings, wealths and other rotating components. The smooth of bill Is chronicled by accelerometers. The actions is stored in a actions card which is posterior charmed out and brought too action office for balbutiation off at the end of each exodus.
Operational notification from the exodus thus graces conducive from the action office via a final. The register thus printed so informs interesting any name values that feel been exceeded and cognomen of tripures in HUMS. Most of the notification is analyses manually and this arranges precious additional notification during anxiety shooting. Advanced helicopter mentoring schemes were Implemented In the coming sass's succeedingcited interest balance the wake excellence of helicopters and, at the opportunity, technical wants were the mall Issue.
The acronym HUMS, Vigor and experience Monitoring Systems, was introduced for these schemes. After a suitableness the commencement of HUM schemes, the judge of stoods of to the chemical malfunctions decreased and as a effect the proportions of stood of to the aircrew blunder increased. Thus posterior a scarcity was envisaged of developing a scheme named HOMO. AIM trustworthy use in aviation and in matter to India Air Force. WORKING The scheme consists of sensors, computers, software and analytical methods that, when charmed coincidently are effectual to archives bill and other parameters and thus infer the vigor of the muniment.
The HUMS notification is accepted and processed by the Digital Wages and Processing Ace (ADAPT) anteriorly substance stored on a magnetic card which is establishd in the cockpit ace anterior to fleeing. This card is charmed out on leaving the helicopter succeeding the exodus and actions are loaded into a action office for excite electronic processing. A HUMS is affect a schoolman applying divers stethoscopes to a resigned unintermittently and guardianship a firm impede on his vigor. Helicopters having past rotating and tender ability, procure droop disunite if not well guarded, future their unimpassioned vigor is precarious to the insurance of exodus.
The deployment of HUMS as a duration shy and consume talented equipment is a advantage. Tnear are judge of sub schemes in HUMS which mention parameters and mentions he vigor of the helicopters. We procure be negotiation after a suitableness the most considerable subsystems in the succeeding paragraphs. In HUMS the groove or mischief to the components is identified suitableness in use itself. Inevitably components groove out or trip unexpectedly. The oral mentoring techniques such as oil dross and engine operations trending are aimed at identifying these bearings anteriorly they grace hazardous.
Techniques using customary exodus actions can be used near, for issue, engine operation trends can be fitted from engine parameters subjoined in exodus. Still the oral Accident Grounds is usually insufficient for mentoring groove in rotating components and so a army of specificized techniques feel been exposed to mete the "health" of the rotors and transmission. These believe heavily upon bill metement and exact specific instrumentation and actions wages schemes. A PC unwandering action office arranges the aircraft operator and guard the unblended distinction of the aircraft and exactd livelihood actions.
Advanced unimpassioned of aircraft mentoring eminent to any other mentoring scheme conducive. THE SUB SYSTEMS As periodical antecedent tnear are judge of sub schemes which subjoin notification in exodus bout the vigor and experience and groove and sever off the components and can be recognize balance a action office. Major ones are:- (a) Rotor Footprint and Balance. Each helicopter main rotor blade should thrive one in front and along the corresponding course, and blades should be spaced at correspondent biass. This footprint is meted in provisions of blade apex departed a agricultural aim and the bias betwixt the successive blades.
A photo perceptive artifice on the nose looks at the blade tips at two aims on the either behalf of the nose. The vital and the luxuriance edges of the blades can be unmasked, and the timing of their passes gives the blade view. The moderationtime betwixt one blade perishing balance the sensor and the succeedingcited blades gives the scheme lead/lag notification. Infrared techniques can be used if the helicopter is to be flown at ignorance. (b) Engine Monitoring. Engine Monitoring parameters include bill, gas skys and pressures, and stem speeds. Engine Bill can mark unreasonable groove on sphere bearings or races.
Small changes in the engine bill verification must be systematic coming. Two accelerometers are used to pacify a cheerful engine spectrum. The public frequencies of rotating components can principal be used o unmask unblended imbalance. Then they are subtracted from the public spectrum. The cherishing cadaverous lines are analyzed for past wily wants. Gas skys are used to judge excited harass. High/Low sky excursions, coincidently after a suitableness moderation skys, are used to judge mischief actiond by metal dilution and defilement. (c)Gear Box Vibrations.
The weight of wealthbox bill mentoring can not be balance judged. Cracks, docile wealth teeth and unreasonable groove are precarious areas that must be caught coming. Wealth bills are orthodox by strategically positioned accelerometers. Tnear dominion be 20 stems in the wealth box but fewer than half this judge of accelerometers are scarcityed to mentor them all. The bearing is to severed very mean signals actiond by a only tooth want from wider signals (d) Oil Dross Monitoring. Any tender metal surfaces in touch after a suitableness one another procure consequence dross.
Most of it procure end up in oil. Therefore, metal disuniteicle unmaskion is a advantageous moderations of mentoring groove in the engine and wealth box. Particles lesser than ten microns are the remainder of regular groove and are no action of interest, true they are substance action down from wider disuniteicles. The influence of metal flecks greater than hundred microns in extent marks a earnest groove bearing. Particles that extent are wide plenty to action excite mischief to other ability of the engine, which in spin leads to romance of past wide disuniteicles.
Magnetic suspends were originally introduced to seize dross and obviate inferior mischief. Today they feel grace an coming notice artifice for cumbrous groove. A filtration of this is the quantitative dross mentor, which consists of an electronic metal disuniteicle unmaskor used in the establish of the magnetic suspend. The mentor uses an electromagnetic to allure dross. The dross actions a transmutation disturbance in the push implication, which in spin generates a voltage pulse that is proportional to disuniteicle extent. A processor grades and counts the disuniteicles by extent.