摘要:
Long thermal paths and the resulting slow response times in sealed and electrically insulated thermal sensors may be substantially reduced by insulating and sealing the sensor (26) by a method which includes the steps of providing (30) an electrostatic fluidized bed of electrically insulating resin; locating (34) the sensor (26) at the bed; coating (36) the sensor (26); removing (38) the sensor from proximity to the bed; and curing (40) to the resin to form a uniform, thin coating encapsulating the sensor (26).
摘要:
Dispositif constitué par des onduleurs, de façon à convertir un courant continu en courant alternatif et comportant un premier onduleur (11) pourvu d'une entrée servant à recevoir du courant continu et d'une sortie constituant la sortie du premier onduleur, un deuxième onduleur (13) pourvu d'une entrée servant à recevoir du courant continu et d'une sortie constituant la sortie du deuxième onduleur, un circuit de sortie de courant alternatif (51) pourvu d'une première entrée servant à recevoir la sortie du premier onduleur, d'une deuxième entrée servant à recevoir la sortie du deuxième onduleur, ainsi que d'une sortie de courant alternatif servant à fournir du courant alternatif à partir de la sortie du premier onduleur et de la sortie du deuxième onduleur et, enfin, une unité de contrôle (49) servant à commander le premier onduleur, afin de minimiser la quantité de courant continu de la sortie du premier onduleur, ainsi qu'à commander la sortie du deuxième onduleur en se basant sur la quantité de courant continu entre la sortie du premier onduleur et la sortie du deuxième onduleur, de façon à minimiser la quantité de courant continu de la sortie du deuxième onduleur.
摘要:
A method is provided for maintaining components subject to fatigue failure during in service use. The method uses statistical distributions (10) in a simulation of in service use (16) of a fleet of components to predict the failure rate (12) of the fleet over a fixed time increment (14, 26) for an assumed inspection program. These predictions are used to determine an operating plan (20), including an inspection program, that will maintain an acceptable failure rate by detecting components with fatigue indications and removing the components prior to failure (22). The inspection program provides actual fatigue data resulting from in service use (18). As the inspection data base grows, the simulation is revised (24, 48) to incorporate the data. The predicted failure rates and the operating plan (20) are then updated based on the revised simulation.
摘要:
Nicking of the conductors (30) of the end turns (20) in the stator (10, 12, 14) of a dynamoelectric machine during the installation of a temperature sensor (26) is avoided by locating the temperature sensor (26) in a gap (22) between the coils defining adjacent end turns (20), thereby providing a machine capable of rapidly responding to excess heat even in a locked rotor situation before detectable levels of smoke, gas, and odors are generated.
摘要:
A method of increasing service life of an oil and a filter in a transmission which converts a variable speed input into a constant speed output for driving a generator producing constant frequency power in an airframe in accordance with the invention utilizes a filter having interstices wetted prior to placement in an oil circuit with a quantity of a liquid additive that is washed from the interstices of the filter into solution with the oil during filling and/or operation of the transmission to form a mixture of the oil and additive which reduces the formation of metallo-organic soaps and solids, that are retained in the interstices of the filter. The filter may have pleats (63) having a plurality of layers including the filter media (46). One of the layers of the filtering media may be coated with an additional layer or surface coating (80) disposed on the pleats which is wettable by the additive.
摘要:
A motor driven fan (10) capable of operating continuously in a dead-headed mode resulting from complete blockage of airflow from an outlet of the fan is provided in a fan including a housing (12) defining both a primary passage (52) for directing a flow of air from an inlet (36) to an outlet (28) of the fan, and a secondary passage for directing a flow of air between the inlet of the fan and ambient air surrounding the housing opposite the primary passage. The secondary passage includes a motor compartment (48) having an inlet passage (90) in fluid communication with the primary passage and an outlet passage (92) in fluid communication with the ambient air surrounding the housing. Impeller means (14), mounted within the housing, providing the flow of air in the primary and the secondary passages. A motor (20), mounted within the motor compartment and operatively connected to drive the impeller means is continuously cooled by the flow of air through the secondary passage even when the flow of air through the primary passage is reduced to zero by a complete blockage of the outlet (28) of the fan.
摘要:
Les systèmes antérieurs de production de courant produisaient des tensions de sortie présentant des surtensions transitoires indésirables et relativement importantes en raison de réductions soudaines de charge. Afin de surmonter ce désavantage, un système de production de courant servant à produire une tension omnibus continue sur une barre omnibus cc (14) est équipé d'un commutateur (80) couplé à travers la barre omnibus cc (14) afin de supprimer les phénomènes transitoires de surtension. Le système de production de courant comprend un générateur synchrone (24) qui produit un courant alternatif et un redresseur (54) qui redresse le courant alternatif pour produire du courant continu et alimenter la barre omnibus cc (14) en courant continu. Un régulateur de tension (62) commande l'intensité de la tension de la barre omnibus cc en variant la quantité de courant fournie à une bobine inductrice (46) associée au générateur synchrone (24). Un commutateur (80) est couplé à travers la barre omnibus cc (14) et est commuté de manière répétitive lorsque la tension de l'omnibus cc atteint une intensité prédéterminée.
摘要:
In a power transmission or generation apparatus having a source of heated pressurized air, the problem of achieving rapid controlled engagement of a hydraulically actuated clutch at low ambient temperatures is solved by utilizing a portion of that heated pressurized air for heating only that small control volume of hydraulic fluid within a clutch control circuit needed to achieve rapid actuation and stable control of the hydraulic clutch. Our invention is thus particularly applicable in a power transmission or generation apparatus having a gas turbine engine, or a turbocharged piston engine as the prime mover. With gas turbine engine powered units, our invention contemplates the use of compressor discharge air, rather than exhaust products for heating the hydraulic fluid. Similarly, for piston engines our invention contemplates the use of turbocharger discharge air rather than exhaust products. In one embodiment a clutch and a control circuit are provided in which the fluid volume of the control circuit is minimized, and fluid removal features are provided to effectively drain all residual fluid from a portion of the control circuit following disengagement of the clutch. On subsequent start-up from cold ambient temperatures, the drained portion of the control circuit is filled with preheated fluid prior to engagement of the clutch thus eliminating problems of slow response and controllability encountered due to cold viscous fluid in prior clutch control circuits.
摘要:
Cavitation in axial piston motors (20) caused to act as a pump by an aiding load (28), and the related difficulty of loss of hydrostatic film (52), and tipping or hammering of motor slippers (64), can be reduced by a method which includes the step of recirculating hydraulic fluid from the supply port (18) of the motor (20) to the return port (30) of the motor (20) upon the occurrence of an aiding load (28).