98results about How to "Increase impact speed" patented technology

A turbocharger turbine housing with at least two volutes utilizing multiple nozzle rings to optimize the turbocharger's proficiency per application, and a valve to control the exhaust flow to selected volutes in the turbine housing.

The invention discloses a STATCOM unbalance compensation control method based on a modular multilevel converter (MMC). The method comprises a converter compensation current dead-beat control method and a converter interphase circular current active damping control method. A comprehensive compensation current dead-beat control part is used for compensating active loss in the MMC by controlling active current, reactive current and negative-sequence current which are output by the MMC so as to eliminate unbalance of the current of a power grid and compensate reactive power; the interphase circular current active damping control method is used for summing by detecting the bridge arm current of upper and lower bridge arms of each phase and multiplying by 0.5 to obtain the circular current of each phase, and superposing the output of three-phase current passing through an active damping controller to dead-beat control output so as to inhibit the alternating current component of the circular current, reduce the current stress of converter devices and reduce the loss of the converter. Through the adoption of the method provided by the invention, compensation of the negative-sequence current and reactive current of unbalanced load of the power grid is realized, inhibition of the interphase double frequency circular current of the MMC is simple, the response speed is high and the stability is high.

A Mars exploration landing buffer device comprises three or four sets of landing legs symmetrically distributed on the periphery of a Mars exploration lander body mechanism. Each set of landing legs is composed of a foot pad (1), a main leg (2), an auxiliary leg (3) and an unfolding locking mechanism (4), wherein the foot pad (1), the main leg (2), the auxiliary leg (3) and the unfolding locking mechanism (4) of the same set of landing legs are connected with one another through universal joints or rotating shafts, and the main leg (2), the auxiliary leg (3), the unfolding locking mechanism (4) of each set of landing legs and the lander body mechanism form a four-bar mechanism so that the landing buffer device can be overturned outwards up and down. The upturning folding structure enables the mass center of the lander to move forwards, the movement stability of the lander in an entering stage is improved, in addition, energy is absorbed through own movement deformation of buffer cellular structures in the main legs (2) and the auxiliary legs (3), soft landing of the lander is achieved, and the device can be applied to design of soft landing buffer mechanisms for landing detection on a planet or a satellite with atmosphere.

A shock-resistant protective shell for a portable electric appliance includes a protective shell additionally arranged on a surface of a portable electric appliance and matching the shape of the portable electric appliance, with a buffer body protruding towards an exterior of the protective shell arranged at the corner of the protective shell. A primary buffer axis of the buffer body points to the centroid of the portable electric appliance, or the projection of the primary buffer axis in the principal plane of the electric appliance extends along the angular bisector between two adjacent sides. The buffer body is arranged with a secondary buffer axis arranged perpendicular to the primary buffer axis or perpendicular to the principal plane of the portable electric appliance. The thickness of the buffer body is at least 3 times of the average thickness of the rest parts in the protective shell except for the buffer body.

The invention relates to a water erosion experimental facility with the rotary impact of high-pressure water jet. The facility simulates the blade erosion caused by drops in a steam turbine through the collision between high-speed jet and a rotating test piece. The facility mainly comprises a motor and a motor control cabinet, a gear case, a rotor and a test piece, a high-pressure water pump and nozzle pipelines, etc. While the rotor and the test piece rotate at a high speed, the high-pressure water supplied by the high-pressure water pump can generate high-speed jet through the nozzle. And the jet hits the test piece at a speed of the vector difference between the jet and the test piece, so that hitting speed is greatly improved. Thus, the evaluation of the water erosion resistance of the steam turbine blade material within a short period on an experiment table becomes possible.

A railway vehicle real vehicle bump test system for coupling passenger behavior detection comprises a central control table, an emitter, a real vehicle and a bump wall. The real vehicle is arranged on a steel rail between the emitter and the bump wall. A bump speed measuring device and a high speed photography device are installed on the side of the bump wall. Experiment dummies are arranged at two ends and in the middle of a passenger area in a carriage of the real vehicle, the experiment dummies are arranged on seats in a non-restricting sitting posture, and a pressure sensor, a displacement sensor and an acceleration sensor are arranged on a body of each experiment dummy. A brake device, a speed adjusting brake device connector and a debugging speed measuring device are used under the debugging condition. In the bump test process, the brake device deviates from the speed adjusting brake device, and a central control table program controls a relevant device to receive and store data. The power-free free sliding distance of the real vehicle is at least 1.1 times as long as the effective journey of the emitter, and the test bump speed of the real vehicle and the bump wall is not lower than 25kilos per hour. Meanwhile, the coupling passenger behavior detection is conducted.

The invention relates to a real vehicle impact test system for a pneumatic emission type railway vehicle. The test system comprises a central control desk, an emitter, a real vehicle and an impact wall, wherein the real vehicle is put on a railway between the emitter and the impact wall; the emitter is a pneumatic emitting device and comprises a walking trolley, a support, an air storage tank, an air compressor, a hollow piston, a triggering mechanism and a cylinder sleeve, the hollow piston is installed on the support, the cylinder sleeve is installed on the walking trolley, and the triggering mechanism is arranged between the hollow piston and the cylinder sleeve; an impact speed measuring device and a high-speed photography device are installed on the side face of the impact wall. In the impact test process, the central control desk controls the emitter, the impact speed measuring device, the high-speed photography device and a force measurement and collection device of the impact wall to work through programs, and receives and stores related data; the unpowered free sliding distance of the real vehicle is at least 1.1 times the effective travel of the emitter, the test impact speed of the real vehicle and the impact wall is not smaller than 25 km/h, and after the experiment, analytical calculation is performed to output an experiment result.

The invention relates to components of high-toughness ultrahigh-strength steel and a preparation process of the high-toughness ultrahigh-strength steel, and belongs to the technical field of alloy steel. The high-toughness ultrahigh-strength steel comprises the components in percentage by mass: 0.25-0.45 percent of C, 0.4-1.2 percent of Si, 0.3-1.5 percent of Mn, 2.0-3.5 percent of Cr, 2.5-4.0 percent of Ni, 2.0-4.5 percent of W, 0.4-0.8 percent of Mo, 0.1-0.4 percent of V, less than or equal to 0.005 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.0015 percent of N, less than or equal to 0.05 percent of Cu, and the balance of Fe. A preparation process of the high-toughness ultrahigh-strength steel comprises a smelting process, a forging process and a heat treatment process. According to the high-toughness ultrahigh-strength steel, the use cost is greatly reduced, the mechanical property meets the national standard requirement and the steel has an important popularization and application value.

A new system for underwater waste disposal is disclosed, consisting of a high-speed, hardened penetrator, optional rocket motor (or other compact propulsion device) and alternative mechanisms for eliminating water drag by surrounding the projectile with a gas layer.

The invention relates to a crusher, in particular to a vertical impact crusher which comprises a crushing cavity shell, a rotor arranged in the crushing cavity shell and a feeding device used for feeding for the rotor. A crushing cavity is formed by the space between the rotor and the crushing cavity shell. Materials entering the rotor are thrown out from multiple distributing openings formed in the circumferential side wall of the rotor and fly to the crushing cavity shell to be subjected to impact crushing. The crushing cavity shell is rotary, and the rotating direction of the crushing cavity shell is opposite to the rotating direction of the rotor. A plurality of impact plates are arranged in the crushing cavity, rotate along with the crushing cavity shell and impact with the materials thrown out from the rotor. Plate hammers are arranged on the faces, impacting with the materials, of the impact plates, each plate hammer is composed of a wear-resisting plate and a hammer edge arranged at the end, close to the rotor, of the wear-resisting plate, and parts of the hammer edges protrude relative to the faces, impacting with the materials, of the wear-resisting plates. By means of the vertical impact crusher, the impact force and the impact speed of the materials are increased, and the material crushing effect is further improved.

A device for determining the instant a vehicle makes contact with an impact object. The device determines the instant of contact by approximating a signal derived from an acceleration signal using a function.

The invention discloses a cyclonic jet mill. The jet mill mainly comprises a grader installed on a crushing box; the crushing box is provided with a crushing cavity which is driven by a power unit and is rotatably installed in the crushing box; the crushing cavity comprises an inner column which has a crushing space, an outer column is hermetically installed at the periphery of the inner column, an air flow channel which communicates with a compressed air source is arranged between the inner column and the outer column, an air flow nozzle is provided on the sidewall of the inner column and communicates with the air flow channel and the crushing space. The cyclonic jet mill provided in the invention overcomes the technical problems of formation of a dead space where air flow cannot reach in the crushing space and insufficient crushing of materials, has a reasonable design and is widely applied in ultrafine crushing of raw mineral materials, chemical raw material, heat sensitive substances and the like.

The invention discloses an ultrasonic-vibration-assisted fiber array end face polishing device. The device comprises a rotatable polishing cushion and a polishing clamp arranged on the polishing cushion, wherein a workpiece (a fiber array assembly) is clamped on the polishing clamp, a to-be-polished end face of the workpiece is contacted with the polishing cushion under the action of gravity, and a polishing solution is introduced to the polishing cushion; the polishing clamp is arranged on the polishing cushion through a support platform elastically arranged in the vertical direction, the vertical end of the polishing clamp is connected with an ultrasonic transducer through an amplitude-change pole, and the ultrasonic transducer is connected with an ultrasonic generator through a wire. The polishing grinding efficiency of the polishing solution can be improved through chemico-mechanical polishing of an ultrasonic-vibration-assisted fiber array end face, the consumption of the polishing solution is reduced, the production cost is saved, and influences of the polishing solution on the environment are reduced; meanwhile, the polishing effect can be effectively improved, and the device can be widely used in actual production.

A method and a device are provided for the thermomechanical treatment of seamless steel rings produced on radial-axial ring rolling machines, particularly rings of fine grain steel, heat-treatable steel, case hardened steel, or austenitic steel, preferably of steel tower flanges for wind turbine generators. The ring blank is inserted into the ring rolling machine at a temperature in the range of 900° C. to 1150° C. and is rolled to an outer diameter preferably in the range of 0.2 m to 10 m by a hot forming process. The hot ring (1) is quickly cooled down by a controlled process directly following the rolling, without secondary heating, from a temperature over the conversion temperature in the austenite range to a temperature below 400° C. The device includes a dipping basin filled with cooling liquid (8) or an unfilled cooling container, and a carrier (5) that can be lowered with a hoisting device (4), the rolled ring (1) lying on the carrier. Pressure nozzles (13) are arranged in the dipping basin or the cooling container (2) on one or several ring lines (11), in an equal distribution, for the targeted application of the cooling liquid (8) onto at least one of the ring-shaped surfaces of the ring (1). Measurement of the ring temperature before and/or after the cooldown is carried out, preferably, with a radiation pyrometer.

The invention relates to a servo-driven three-cutter mechanical shock high-speed grinder which comprises a frame; a smashing device is fixedly arranged at the center of the frame; a grading device isfixedly arranged on the top of the smashing device; the smashing device is composed of an outer rotor servo motor and three rotary cutters; the outer rotor servo motor is used for directly driving a second cutter and utilizes two planetary gear trains to drive a first cutter and a third cutter, so that the first cutter and the second cutter are rotated along the opposite directions and the secondcutter and the third cutter are rotated along the opposite directions. The servo-driven three-cutter mechanical shock high-speed grinder is capable of effectively increasing the relative impact velocity of grains and cutters, forming an anti-abrading material layer on the third cutter surface, delaying the abrasion of the cutters and prolonging the service life of equipment, and has the advantagesof compact structure, high smashing efficiency and convenience in operation.

Disclosed is a pressure friction plate braking type real rail vehicle bump testing system. The pressure friction plate braking type real rail vehicle bump testing system comprises a central control panel, a launcher, a real vehicle and a bump wall. The real vehicle is arranged on the steel rails between the launcher and the bump wall; the side surface of the bump wall is provided with a bump speed measuring device and a high-speed photographing device. A braking device, a speed regulation braking device joint and a testing speed measuring device are configured and used during working condition testing; the braking device is of a pressure friction plate type structure and comprises wedge friction plates, a friction bottom plate, a friction cavity, a pressure unit and steel cables, wherein the pressure unit is a hydraulic, pneumatic, electromagnetic or mechanical adjustable pressure unit. During bump testing, the central control panel controls the working of the launcher, the bump speed measuring device, the high-speed photographing device, and a force measurement collecting device of the bump wall through programs, and receives and stores associated data; the powerless free sliding distance of the real vehicle is at least 0.1 time larger than the effective travel of the launcher; the testing bump speed between the real vehicle and the bump wall is not smaller than 25 kilometers per hour.

The invention discloses a renovated iron drum production process. Cleaning solvent adopted in high-pressure cleaning comprises 40-60 weight parts of propanediol butyl ether, 16-20 weight parts of xylene, 10-30 weight parts of surface active agent, 6-8 weight parts of polyethylene glycol, 0.5-3 weight parts of coconut oil fatty acid diethanolamide, 3-5 weight parts of corrosion inhibitor, 0.5-1 weight part of modified polyether defoaming agent and 2-4 weight parts of stabilizing agent; then, water is used for washing the internals and the externals of drums; during cleaning, the cleaning solvent is removed by adopting a pressure difference; the shot blasting treatment is performed on the internal and the externals of the iron drums; shots of a shot blasting machine are stainless steel shotsor iron shots with diameters of 1.5-3 mm; a dust removing system is arranged on the shot blasting machine; and the powder spraying, the paint spraying and the drying are performed at 170-180 DEG C. The renovated iron drum production process controls each process link in a refined mode, is not easy to generate leakage at the bottoms of the renovated drums and uniform and beautiful in powder spraying to the surfaces, and only reaches the defective rate of about 2%.

Impact energy absorbing devices, in some embodiments, may be configured as a helmet having suspension elements employing “rate activated tethers” (RATs), a speed-sensitive flexible strapping material. The RATs are configured to suspend a helmet shell on the head of a wearer, so that impact to the helmet causes extension of the RATs. The RATs provide for: (1) steady force over long strokes, and (2) a stroke force that increases with increasing impact velocity. Standard impact testing of a helmeted headform shows that the RAT suspension decreases head accelerations by 50% relative to a standard suspension system. This decrease in head acceleration is expected to lead to a reduced likelihood of brain and head injury. Because the RATs absorb energy during tensile extension, they offer increases in energy absorption efficiency. These RAT suspensions can potentially replace or complement existing helmet pad and suspension systems in military, sports, and industrial safety-wear.

The invention provides a voltage detection-type active filter for improving electric energy quality of a PCC position. The voltage detection-type active filter comprises a power electronic converter,an LCL filtering circuit, a DC-side capacitor, a network-side current detection interface circuit, a DC-side voltage detection interface circuit, a PPC voltage and zero-crossing detection circuit anda processor, wherein the processor is connected with the power electronic converter, the network-side current detection interface circuit, the DC-side voltage detection interface circuit and the PPC voltage and zero-crossing detection circuit, the power electronic converter is connected with the LCL filtering circuit and the DC-side capacitor, the LCL filtering circuit is connected with the network-side current detection interface circuit, and the DC-side capacitor is connected with the DC-side voltage detection interface circuit. By the voltage detection-type active filter, a PCC harmonic voltage is only extracted, a current is not extracted, the hardware structure is simplified, the influence speed is increased, the designated subharmonic voltage can be eliminated, the voltage detection-type active filter is simple to control and simple and convenient to operate, the method is reasonable, and power grid compensation can be performed in real time.

A device and a method for forming by stamping a curved metal sheet. The device includes a punch made of deformable and substantially non-compressible material, a hammer configured to strike the punch along the longitudinal axis Z. A generator to generate a magnetic field configured to impart on the hammer a speed greater than a predetermined speed in the Z direction. The device further includes a matrix of predetermined shape, approximately rotationally symmetrical about the longitudinal axis Z. The punch is rotationally symmetrical about the longitudinal axis and configured to be disposed in front of the matrix. The punch has a longitudinal dimension in the same order of magnitude as its dimension perpendicular to the longitudinal axis Z.

The invention relates to a real vehicle impact test system for a double-roller braking railway vehicle. The test system comprises a central control desk, an emitter, a real vehicle and an impact wall, wherein the real vehicle is put on a railway between the emitter and the impact wall; an impact speed measuring device and a high-speed photography device are installed on the side face of the impact wall; a brake device, a speed adjusting brake device connector and an adjustment speed measuring device are arranged and used in the working condition adjusting process; the brake device is a brake mechanism with double rollers and comprises a fixed pulley, a steel wire rope, a rack, a brake wheel, a brake mechanism body, the big roller and the small roller, the brake wheel, the big roller and the small roller are of an integrated structure, and the directions of the steel wire rope winding around the big roller and the small roller are opposite. In the impact test process, the brake device breaks away from the speed adjusting brake device connector, and the central control desk controls the relates devices to receive and store data; the unpowered free sliding distance of the real vehicle is at least 1.1 times the effective travel of the emitter, and the test impact speed of the real vehicle and the impact wall is not smaller than 25 km/h.