초록 ▼

A surge detection system for detecting a surge occurred at a compressor of a gas turbine aeroengine having a turbine connected to the compressor. In the system, the ratio between the compressor outlet pressure and its differential and the differential of the turbine inlet temperature (or the ratio b

A surge detection system for detecting a surge occurred at a compressor of a gas turbine aeroengine having a turbine connected to the compressor. In the system, the ratio between the compressor outlet pressure and its differential and the differential of the turbine inlet temperature (or the ratio between the turbine inlet temperature and its differential) are calculated. Then, the calculated value are multiplied together and the product is compared with a threshold value. When the product is less than the threshold value, it is determined that a surge occurred at the compressor. With this, a surge occurred at the compressor and a magnitude or degree of the surge occurred may be accurately detected.

대표청구항 ▼

A surge detection system for detecting a surge occurred at a compressor of a gas turbine aeroengine having a turbine connected to the compressor. In the system, the ratio between the compressor outlet pressure and its differential and the differential of the turbine inlet temperature (or the ratio b

A surge detection system for detecting a surge occurred at a compressor of a gas turbine aeroengine having a turbine connected to the compressor. In the system, the ratio between the compressor outlet pressure and its differential and the differential of the turbine inlet temperature (or the ratio between the turbine inlet temperature and its differential) are calculated. Then, the calculated value are multiplied together and the product is compared with a threshold value. When the product is less than the threshold value, it is determined that a surge occurred at the compressor. With this, a surge occurred at the compressor and a magnitude or degree of the surge occurred may be accurately detected. piston in response to operation of a brake operating member; an auxiliary hydraulic pressure source for increasing hydraulic pressure of brake fluid in a reservoir to a predetermined pressure level and for outputting power hydraulic pressure; a pressure modulating device connected to the auxiliary hydraulic pressure source and the reservoir for modulating the power hydraulic pressure outputted from the auxiliary hydraulic pressure source to a predetermined pressure level corresponding to movement of the input member relative to the power piston and for supplying the modulated power hydraulic pressure to the power chamber; and a cylindrical elastic member having two opening end portions, one opening end portion of being connected to the power piston and the other opening end portion being connected to the housing, with a space defined in the cylindrical elastic member communicating with the pressure modulating device and the reservoir. 11. The hydraulic pressure assisting device according to claim 10, further comprising a solid covering member covering the cylindrical elastic member, an inner surface of the solid covering member being approximately in contact with an outer surface of the cylindrical elastic member when the brake operating member is in a non-operated condition. 12. The hydraulic pressure assisting device according to claim 10, wherein the pressure modulating device is connected to the reservoir via the space in the cylindrical elastic member and a hydraulic communicating passage defined in the housing. 13. The hydraulic pressure assisting device according to claim 10, wherein the housing includes a first cylinder, a second cylinder and a third cylinder. 14. The hydraulic pressure assisting device according to claim 13, wherein the first cylinder includes a stepped cylinder bore, the second and third cylinders being disposed in the stepped cylinder bore. 15. The hydraulic pressure assisting device according to claim 14, wherein the other opening end portion of the cylindrical elastic member is connected to the third cylinder. 16. The hydraulic pressure assisting device according to claim 10, wherein the input member is provided with a communicating hole and the power piston is provided with a communicating hole that communicates the communicating hole in the input member with the space defined in the cylindrical elastic member. 17. The hydraulic pressure assisting device according to claim 16, wherein the communicating hole in the input member is a radially extending communication hole, the radially extending communication hole in the input member being communicated with an axially extending communicating hole in the input member. 18. The hydraulic pressure assisting device according to claim 10, wherein the pressure modulating device is a spool.