184results about How to "Increase limit speed" patented technology

A control strategy for a gas turbine engine which exchanges future lifetime of the engine for present thrust. Gas turbine engines, such as those used in aircraft, sometimes incur damage, as when they ingest birds, or are struck with ballistic objects fired by an enemy. The invention detects the damage, and invokes a control strategy wherein the engine is operated in a more harsh manner, thereby sacrificing a significant part of the remaining lifetime of the engine, in order to obtain thrust currently.

The invention discloses a magneto-rheological damper. The magneto-rheological damper comprises a damping cylinder and a compensating cylinder which are connected vertically. The damping cylinder comprises an outer cylinder, wherein an inner cylinder is arranged in the outer cylinder, the outer wall of the inner cylinder is alternatively sleeved with magnet yoke rings and a permanent magnet ring; a magnet exciting coil winds in an annular groove formed by adjacent magnet yoke rings and the permanent magnet ring between them; the magnet yoke rings and the magnet exciting coil are externally and alternatively sleeved with flux sleeve rings and magnet isolating sleeve rings; an annular damping channel is formed among the flux sleeve rings, the magnet isolating sleeve rings, and the inner wall of the outer cylinder; the upper and lower end openings of the outer cylinder are equipped with upper and lower end covers, and the inner cylinder is provided with a damping piston for dividing a damping cavity inside into upper and lower cavities; the upper and lower cavities are interconnected with the damping channel. The compensating cylinder comprises a cylinder body, wherein the upper end opening of the cylinder body is connected with the lower end cover, and the lower end opening of the cylinder body is equipped with the end cover; a compensating cavity forms in the cylinder body, and the cylinder body is provided with a floating piston for dividing the compensating cavity into fluid and gas cavities; the fluid cavity is interconnected with the lower cavity. The magneto-rheological damper solves the contradiction of adjustable damping force and adjustable multiple of the existing magneto-rheological damper, and is especially applicable to half-active control of an impact vibrating system.

A two-stage bearing using electromagnetically driven speed regulation between two stages is composed of an electromagnetically driven speed regulating mechanism and a two-stage bearing mechanism. It can increase the extreme rotation speed of whole bearing to maximum and decrease the relative rotation speed between two stages to minimum if it is used as a single-stage bearing for longer service life.

The invention provides a high-speed spindle with tapered hole capable of being automatically locked. The high-speed spindle comprises a spindle, an expansion wall, hydraulic cylinders and an oil path and is characterized in that: an inner hole at the shaft end of the spindle is fixedly linked with the expansion wall with the tapered hole through interference fit; two oil cavities are disposed on the outer surface of the expansion wall; a liquid medium is filled in the oil cavities; two sets of the hydraulic cylinders consisting of a cylinder body component and a piston are symmetrically arranged on the spindle with respect to the axis of the spindle; the cylinder body components are communicated with the oil cavities through the oil path; and a spring is arranged at the bottom of each piston. The high-speed spindle disclosed by the invention has the advantages that: the magnitude of the interference fit between the tapered surface of the knife handle and the tapered hole of the spindle is subjected to automatic compensation. Furthermore, the compensation amount is increased when a rotation speed is increased. The linkage rigidness and the positioning precision of the knife handle and the spindle are ensured at any rotation speed, and the limit rotation speed is improved. The deformation coaxiality generated by the expansion wall is very high, so that the good radial position precision can be ensured. The liquid medium can supply great damping, the power absorbers consist of the piston and the spring, so that the two have vibration absorption effects on the spindle.

The invention discloses a trolley limiting buffer device of a bridge crane. The trolley limiting buffer device comprises a trolley rail, and end beams are fixedly mounted at the two ends of the trolley rail; a trolley frame is arranged on the trolley rail; the top surfaces of the end beams are connected with car stops through shock absorbers; magnets are mounted at the centers of the side surfacesof the car stops through mounting holes; the car stops are hinged to the top surface of the trolley rail; wheel chocks are further mounted in the positions, between the two car stops, on the trolleyrail; hydraulic rods are fixedly mounted on the left and right sides of the trolley frame; wheels are mounted on the trolley frame through wheel shafts; and cylindrical magnets are mounted at one endsof the hydraulic rods through mounting sleeves. According to the trolley limiting buffer device, the hydraulic rods are in contact with the car stops hinged to the trolley rail, buffer and limiting are achieved, during collision, the wheels are buffered and decelerated through rotation of the car stops and deceleration strips in the wheel chocks, collision force is smaller, the car stops and thehydraulic rods are protected, rebound force of a trolley is smaller, double buffer and limiting for the trolley are achieved, the structure is simple, cost is low, and loading and unloading efficiencyof the crane is high.

The invention relates to a combined direct current chopper adjuster for pushing fish torpedo, which comprises a dual-quadrant direct current copper (3), a direct current motor for pushing fish torpedo; a super capacity group (4) for supplying the electric energy of limited navigation speed of fish torpedo and filtering the wave of bus voltage; a ascending direct current copper (27) for lifting the supplying voltage of said dual-quadrant direct copper and the direct current motor; and a pre-charging device (28) for limiting discharge current of accumulator group, the ascending copper circuit can improve the output voltage of said fish torpedo direct current pushing system, increase the instant output powder of motor, and lift the instant limited speed of fish torpedo, while in limited speed, the copper can control the accumulator group in constant-current discharge mode to effectively confirm the discharge ability of accumulator group. The invention can adjust the speed of fish torpedo in large range with improved shot range.

This invention discloses a film lubrication method for thrust bearing roller cone races and ribs, which forms a wedge clearance between the large end surface of a roller and inside wall of a ring rib and fills it with lubrication oil, when the shape, size of the clearance and axial load, glide speed and viscosity of the oil are matched to each other, a dynamic pressure film is formed between the two surfaces, in which the wedge clearance is formed by cone roller spherical large end surface and the ring rib spherical ring, so it's easy to form a dynamic pressure film by selecting race SRQ of the inner surface of the race and axis ring and srq of the cone large end surface reasonably.