摘要:
A method for producing a continuous, three-dimensional, closed semi-finished product made of fiber composite from at least one planar, flat fibrous preform. The method is characterized in that the flat fibrous preform is initially placed flat and aligned to produce a load-bearing fiber orientation and subsequently formed into a three-dimensional structure. In a final step, the three-dimensional structure is then closed to form a closed semi-finished product.
摘要:
The present invention relates to a rotorcraft blade (1) provided with at least one spar (3) and an outer covering (4), said blade (1) including a hollow sleeve (10) with a wall (11) that is provided at least with said outer covering (4) secured to said spar (3). The blade includes a rotary damper (20) provided with an inner tubular strength member (21) and an outer tubular strength member (22) that are coaxial and connected together by a ring (23) of viscoelastic material, said inner tubular strength member (21) being secured to said covering (4), and said outer tubular strength member (22) being provided with a fork (25) possessing first and second tines (26, 27) facing each other so as to be suitable for receiving a first ball joint (41) close to the pitch-variation axis (AX1) of said blade (1).
摘要:
A fuselage structure, particularly an aircraft door (1) of composite material comprising at least one panel (2) and at least one beam (3) mounted to each other and the panel (2) with the panel (2) being formed of at least one group of composite layers (5, 6, 20). The at least one beam (3) is provided at least at one of its respective ends (10, 11) with a flange (13) suitable for adhesive engagement with the at least one panel (2). The at least one group of composite layers (5, 6, 20) of the panel (2) is in form locking engagement with this flange (13) of the beam (3).
摘要:
The invention relates to a skid-type landing gear (1) for a helicopter (2) comprising bow shaped crosstubes (10-13) directed symmetrically towards a left- and a right-hand side of a longitudinal mid axis (9) of the helicopter (2) with respective skids (14, 15) at outboard ends thereof and main beams (5-8) in a fuselage (4), the crosstubes (10-13) being connected to the main beams (5-8) via supports (16-23) fixed to the main beams (5-8). The skid-type landing gear (1) is retractable. A method for operating such a skid-type landing gear (1) for a helicopter (2) is provided.
摘要:
An air vehicle with a slip protecting and gas sealing composite floor (1, 10) inside a fuselage, particularly a helicopter with a slip protecting and gas sealing composite floor (1, 10) inside a fuselage. Said slip protecting and gas sealing composite floor (1, 10) is built up of a profiled elastomer layer (2) provided at its bottom side with a cross-linking agent, n-layers (3) of a further component or a variety of different components and partially thermosetting resin covered by a profiled elastomer layer (2), a honey comb layer (4) and lower n-layers (5) of said further component or variety of different components and partially thermosetting resin, said honey comb layer (4) being sandwiched between said n-layers (3) and said lower n-layers (5).
摘要:
A rotary wing aircraft (1) provided with a main lift rotor (2), a tail rotor (5), and a power plant (4) driving a main gearbox (3) that co-operates with said main rotor (2), said tail rotor (5) being provided with a plurality of blades (10) of variable pitch (I) and with a pitch modification device (20), and said aircraft (1) having control means (30) for controlling said pitch modification device (20). The aircraft (1) includes an electric motor (9) for rotating said tail rotor (5) and regulator means (TRCU) connected to the control means (30) and also to the electric motor (9) and to the pitch modification device (20). The regulator means (TRCU) generate a first setpoint concerning pitch that is transmitted to the pitch modification device (20), and a second setpoint for controlling a motor parameter that is transmitted to the electric motor (9).
摘要:
A coupling means (10) extending along a longitudinal axis of symmetry (100) from a first plate (11) towards a second plate (12), which plates are connected together by a link member (20). Said link member (20) is provided with a first hub (21) secured to said first plate (11) and with a second hub (22) secured to said second plate (12), a first end section (21′) of the first hub (21) being connected to a second end section (22′) of the second hub (22) by link means (30), said link means (30) comprising a first web (31) connecting said first end section (21′) to a maximum section (33) of said link means (30), said link means (30) having a second web (32) connecting a second end section (22′) of said second hub (22) to said maximum section (33).
摘要:
A device (10) for reducing vibration of a main rotor (1) having a support (20) and a plurality of heavy elements (30) and of rollers (50). Each heavy element (30) includes two first openings (31) respectively at least partially in registration with two second openings (22) of the support (20. Each roller (50) passes through a first opening (31) and a second opening (22). The device (10) has link means (60) for connecting the support (20) to the hub (2). A drive shaft (70) and a drive means (80) rotate at a first speed of rotation (V1) greater than a second speed of rotation (V2) of the hub (2). The drive shaft (70) rotates about an axis of rotation (AX1) of the support (20). The link means (60) is connected to the support (20) by a link member (90) enabling the support (20) to rotate about the axis of rotation (AX1) relative to the link means (60).
摘要:
A method of providing a volume-mass law for determination of a fuel flow rate of an engine, particularly providing a fuel flow rate to a helicopter turbine, comprising the steps of: determining a sample type of fuel and a start density ρ0 of said sample type of fuel in said fuel tank using an equation ρ0=aT+b0, with a and b0 being known for said sample type of fuel and calculating real time offset parameters bn from an algorithm to determine real time densities ρ of the fuel.
摘要翻译:一种提供用于确定发动机的燃料流量的体积质量定律的方法,特别是向直升机涡轮机提供燃料流率,包括以下步骤:确定燃料的样品类型和所述样品的起始密度rho0 使用方程式rho0 = aT + b0,其中a和b0对于所述样品类型的燃料是已知的,并且从算法计算实时偏移参数bn以确定燃料的实时密度rho,所述燃料箱中的燃料类型。
摘要:
A method of performing a health check of at least one turbine engine (3). During a development step (STP0), the installation losses (1) are quantified for a plurality of test values for a reduced speed of rotation (Ng′) of a gas generator (4) of the engine. During an acquisition step (STP1), the speed of rotation of said gas generator (4) is increased until said engine develops a maximum power, and then the speed of rotation of the gas generator (4) is decreased until the reduced speed of rotation (Ng′) reaches a test value. The aircraft is stabilized and at least one monitoring value is acquired. During an evaluation step (STP2) of evaluating the health check, at least one operating margin is determined by using a monitoring value and the effects of mounting the engine in an airplane.