摘要:
A drive apparatus (10) for propelling a vehicle across a body of water is described. The apparatus (10) comprises a prime mover, for example a gas turbine engine (12), and a propelling arrangement (26) driven by the prime mover for propelling the vehicle across the body of water and thereby provide a reaction force on the prime mover. The apparatus (10) also includes a braking arrangement (42) to apply a braking force to the propelling arrangement (26).
摘要:
With an active magnetic bearing 1 there is a limit to the available rapidity of response to transient loadings upon a target or rotor 4. Thus, in accordance with the present invention, storage devices 25, 125, 225, 35 hold an electrical voltage VS significantly greater than the normal supply voltage V provided by a normal electrical source 22, 32. In such circumstances when a very large transient loading is detected on the bearing 1 a switch 26, 37 discharges the supply voltage VS across the coil 23, 33 in order that a more rapid increase and higher value inductance current IT is presented to the coil 22, 32 in response to that variable loading upon the target/rotor 24, 34. The electrical discharge from the storage device 25, 125, 225, 35 can be adjusted using the switch 26, 37 or mixing the storage devices 25, 125, 225, 35 as required for an appropriate discharge signal shape. Generally, the active magnetic bearing 21, 31 is controlled by a controller device which monitors target/rotor 24, 34 position in order to determine transient loading and therefore switching of the storage device 25, 125, 225, 35.
摘要:
A composite article and its method of manufacture are disclosed. The composite article includes a matrix formed of a mixture of glass particles and a cured polymer, and a layer of cured polymer material that is substantially free of the glass particles, said layer being formed on at least one surface of the cast article whereby the glass particles are not surface exposed on the at least one surface.
摘要:
A method for joining components comprises locating a region, such as an end region 24, of a shape memory alloy (SMA) material component 10 adjacent to a further component 12, and generating localised plastic deformation of the aforesaid region to create a joint between the components 10, 12. The localised plastic deformation of the shape memory alloy material component 10 is preferably generated by applying a shock load to the shape memory alloy material component 10.
摘要:
A method and a system (10) for exhausting gas via a nozzle (19, 21) of a gas turbine engine, for example. The system (10) comprises a nozzle (19, 21) comprising a nozzle body portion (32, 33, 74) defining a nozzle exit (42, 43), characterised in that the nozzle body portion (32, 33, 74) comprises fluid injection means (60), positioned upstream of the exit (42, 43) relative to a fluid flow (F1, F2) created by the operation of the system, for injecting fluid (68) upstream of the exit (42, 43).
摘要:
A seal (40) provides sealing between two pressure zones (60, 62) and a rotating and non-rotating member (42, 52) by providing a first sealing member (46) between two seal lands (48, 50). A second seal (64) is mounted between the non-rotating member (52, 58) and one of the seal lands (50, 66) so as to control pressure around the seal lands (48, 50).
摘要:
An anchorless boat positioning system for establishing and maintaining a boat at a selected geographic location without the use of a conventional anchor. In one embodiment, a steerable thruster is used whose thrust and steering direction are determined and controlled on the basis of position information signals received from global positioning system (GPS) satellites, relative steering angle between the boat and the thruster and boat heading indication signals from a magnetic compass. The system continuously monitors the position and heading of the boat and compares it with the stored coordinates of the selected anchoring location(s) to generate control signals for the steerable motor. Several modes of operation are disclosed and Euler transformations for offset antenna placement for error reduction are taught. Proportional, integral, and derivative control (PID) of four constants of vessel control is also provided. Multiple thrusters in various arrangements are also provided to control either the orientation of the boat or a second point of interest on the boat at a second geographic location.
摘要:
An apparatus and system are disclosed for indicating relative positions of elements in a surgical apparatus. The indicating elements can include electrical circuitry for activating visual, audible or tactile indicators, thereby alerting the user that an event has occured with respect to the instrument.
摘要:
The invention provides novel 1,2-diphenylethene derivatives and pharmaceutically acceptable salts thereof, the process for production of these compounds and their pharmaceutical composition and the use of these compounds as modulators of T-cells, neutrophils, macrophages and their associated cytokines as agents for treating immune, inflammatory and auto-immune diseases.
摘要:
A radar controlled automatic target illumination system for marine and other moving vessels. A radar system operably connected to the vessel produces an electronic signal corresponding to an azimuth of a target relative to, and in proximity to the vessel. An array of lights are connected to the vessel, each light being aimed outwardly in a different lighting sector, the sectors being adjacent one to another around the vessel, each of said lights, when automatically activated, illuminating one lighting sector. An electronic processor is operably connected between the radar system and the array of lights for the automatic selective activation of one or more of the lights to illuminate the target within a corresponding lighting sector which the radar system has identified.