摘要:
A pressure tight large-scaled membrane structure comprising a bag body(2) having a plurality of gores(3) attached to each other along an attachment line, and a plurality of first ropes(7) attached over a predetermined range of the bag body(2) in such a manner as to be orthogonal to the attachment line of the gores(3), whereby a cylindrical shaped portion(6) is formed. The cylindrical shaped portion(6) has a substantially circular cross-sectional area that is a maximum substantially circular cross-section of the bag body(2) and the plurality of first ropes(7) each having approximately the same length as a circumference of the substantially circular-cross section having a maximum area with respect to the bag body(2).
摘要:
An ultrasonic test method for detecting a defective portion more precisely in a noncontact reflection way, and ultra-sonic test instrument used for the method. An ultrasonic wave is transmitted from a transmitter (20 (21)) provided on one side of an object under test, and the reflected wave is received by a receiver (30 (31)) provided on the same side. The ultrasonic wave is transmitted/received through an air layer between the transmitter and the object (100) under test and between the receiver and the object (100). The relative positions of the transmitter (20), the receiver (30), and the object (100) are so determined that the air propagation time ta of the air path (RA) between the transmitter and the receiver is longer than the propagation time tb of the reflected wave in the reflection path (RB). The propagation of the ultrasonic wave through the solid body between the transmitter and the receiver is blocked. This invention is suitable to test laminated material (100) such as a laminate of CFRP (101) and insulation (102) in a noncontact way.
摘要:
Provided is an antenna capable of establishing electrical conductivity between a flange-like short-circuit section, of a power supply section and a thin metal plate (for example, copper foil) even in a harsh temperature environment in a space environment. Under a state in which an apical portion (31) of a power supply section (30) is inserted from an outer side of a face plate (20) into a hole (50) for the power supply section of a thin metal plate (copper foil) (21), a dielectric plate (22), and a metal plate (ring-like metal plate) (40), a plurality of screws (60) are inserted from the outer side of a flange-like short-circuit section (32) through a plurality of insertion holes (65) of the flange-like short-circuit section, (32), the thin metal plate (copper foil) (21), and the dielectric plate (22), and the plurality of screws (60) are threadingly inserted into a plurality of tapped holes (70) of the metal plate (ring-like metal plate) (40) so that electrical conductivity between the flange-like short-circuit section (32) and the thin metal plate (copper foil) (21) is established through direct contact.
摘要:
A turbofan jet engine (100) is provided which is capable of increasing the bypass ratio without increasing the fan diameter, and of reducing air resistance acting on the engine, a front fan duct (20) that discharges air compressed by a front fan (10) to the atmosphere and an aft fan duct (50) that introduces air into an aft fan (40) are disposed such as to change cross-sectional shapes thereof by rotating around a core engine (30) in a counterclockwise direction, so that the cross-sectional geometric relationship between the front fan duct and the aft fan duct at a position immediately posterior to the front fan and a cross-sectional geometric relationship between the front fan duct and the aft fan duct at a position immediately anterior to the aft fan are inverted.
摘要:
In this cooling structure, a cooling flow path, which is meandering around a flow direction of a high temperature combustion gas, is provided in a structural body. The cooling flow path has an inflow path for a cooling air formed inside of the structural body; at least one straight flow path provided with intervals with respect to an axial line; and a turning flow path for communicating the end portions of the inflow path with the straight flow path or communicating with the end portions of the straight flow paths one after another.
摘要:
A pressure tight large-scaled membrane structure comprising a bag body(2) having a plurality of gores(3) attached to each other along an attachment line, and a plurality of first ropes(7) attached over a predetermined range of the bag body(2) in such a manner as to be orthogonal to the attachment line of the gores(3), whereby a cylindrical shaped portion(6) is formed. The cylindrical shaped portion(6) has a substantially circular cross-sectional area that is a maximum substantially circular cross-section of the bag body(2) and the plurality of first ropes(7) each having approximately the same length as a circumference of the substantially circular-cross section having a maximum area with respect to the bag body(2).
摘要:
An ultrasonic test method for detecting a defective portion more precisely in a noncontact reflection way, and ultra-sonic test instrument used for the method. An ultrasonic wave is transmitted from a transmitter (20 (21)) provided on one side of an object under test, and the reflected wave is received by a receiver (30 (31)) provided on the same side. The ultrasonic wave is transmitted/received through an air layer between the transmitter and the object (100) under test and between the receiver and the object (100). The relative positions of the transmitter (20), the receiver (30), and the object (100) are so determined that the air propagation time ta of the air path (RA) between the transmitter and the receiver is longer than the propagation time tb of the reflected wave in the reflection path (RB). The propagation of the ultrasonic wave through the solid body between the transmitter and the receiver is blocked. This invention is suitable to test laminated material (100) such as a laminate of CFRP (101) and insulation (102) in a noncontact way.
摘要:
A turbofan jet engine (100) is provided which is capable of increasing the bypass ratio without increasing the fan diameter, and of reducing air resistance acting on the engine, a front fan duct (20) that discharges air compressed by a front fan (10) to the atmosphere and an aft fan duct (50) that introduces air into an aft fan (40) are disposed such as to change cross-sectional shapes thereof by rotating around a core engine (30) in a counterclockwise direction, so that the cross-sectional geometric relationship between the front fan duct and the aft fan duct at a position immediately posterior to the front fan and a cross-sectional geometric relationship between the front fan duct and the aft fan duct at a position immediately anterior to the aft fan are inverted.