Auteur Luis San Andrés
Documents disponibles écrits par cet auteur (20)
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Luis San Andrés, Auteur |Aircraft engine rotors are particularly sensitive to rotor imbalance and sudden maneuver loads, since they are always supported on rolling element bearings with little damping. Most engines incorporate squeeze film dampers (SFDs) as means to dis[...]
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Ryu, Keun, Auteur ; Luis San Andrés, Auteur |Gas foil bearings (GFBs) operating at high temperature rely on thermal management procedures that supply needed cooling flow streams to keep the bearing and rotor from overheating. Poor thermal management not only makes systems inefficient and c[...]
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Adolfo Delgado, Auteur ; Luis San Andrés, Auteur |Squeeze film dampers (SFDs) aid to reduce excessive vibration levels due to rotor imbalance and to raise stability thresholds in rotor-bearing systems. SFDs commonly include end seals to increase their damping capability with a lesser lubricant [...]
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Luis San Andrés, Auteur ; Thomas Abraham Chirathadam, Auteur |Metal mesh foil bearings (MMFBs) are inexpensive compliant gas bearing type that aim to enable high speed, high temperature operation of small turbomachinery. A MMFB with an inner diameter of 28.00 mm and length of 28.05 mm is constructed with l[...]
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Adolfo Delgado, Auteur ; Luis San Andrés, Auteur |In rotor-bearing systems, squeeze film dampers (SFDs) provide structural isolation, reduce amplitudes of rotor response to imbalance, and in some instances, increase the system threshold speed of instability. SFDs are typically installed at the [...]
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Luis San Andrés, Auteur ; Ryu, Keun, Auteur ; Tae Ho Kim, Auteur |Established high temperature operation of gas foil bearings (GFB) is of great interest for gas turbine applications. The effects of (high) shaft temperature on the structural stiffness and mechanical energy dissipation parameters of a foil beari[...]
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Luis San Andrés, Auteur ; Thomas Abraham Chirathadam, Auteur ; Tae Ho Kim, Auteur |Engineered metal mesh foil bearings (MMFBs) are a promising low cost bearing technology for oil-free microturbomachinery. In a MMFB, a ring shaped metal mesh provides a soft elastic support to a smooth arcuate foil wrapped around a rotating shaf[...]
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Luis San Andrés, Auteur ; Thomas Abraham Chirathadam, Auteur ; Ryu, Keun, Auteur |Metal mesh foil bearings (MMFBs) are a promising low cost gas bearing technology for high performance oil-free microturbomachinery. Elimination of complex oil lubrication and sealing system by deploying MMFBs in rotorcraft gas turbine engines of[...]
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Luis San Andrés, Auteur ; Thomas Abraham Chirathadam, Auteur |Gas bearings in oil-free microturbomachinery for gas process applications and power generation (
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Adolfo Delgado, Auteur ; Luis San Andrés, Auteur |Squeeze film damper (SFD) designs typically implement supply grooves to ensure adequate lubricant flow into the film lands. Oil seal rings, of land film clearance c, also incorporate short and shallow grooves (length
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Samuel A. Howard, Auteur ; Luis San Andrés, Auteur |Gas foil bearings offer several advantages over traditional bearing types that make them attractive for use in high-speed turbomachinery. They can operate at very high temperatures, require no lubrication supply (oil pumps, seals, etc.), exhibit[...]
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Luis San Andrés, Auteur ; Adolfo Delgado, Auteur |Oil seals in centrifugal compressors reduce leakage of the process gas into the support bearings and ambient. Under certain operating conditions of speed and pressure, oil seals lock, becoming a source of hydrodynamic instability due to excessiv[...]
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Luis San Andrés, Auteur ; Vince Barbarie, Auteur ; Avijit Bhattacharya, Auteur |Bearing systems in engine-oil lubricated turbochargers (TCs) must operate reliably over a wide range of shaft speeds and withstand severe axial and radial thermal gradients. An engineered thermal management of the energy flows into and out of th[...]
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Luis San Andrés, Auteur |As oil fields deplete, in particular in deep sea reservoirs, pump and compression systems work under more strenuous conditions with gas in liquid and liquid in gas mixtures, mostly inhomogeneous. Off-design operation affects system overall effic[...]
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Luis San Andrés, Auteur ; José Baker, Auteur ; Adolfo Delgado, Auteur |Brush seals effectively control leakage in air breathing engines, albeit only applied for relatively low-pressure differentials. Hybrid brush seals (HBS) are an alternative to resolve poor reliability resulting from bristle tip wear while also a[...]
