33results about How to "Reduce fatigue loss" patented technology

A microwave antenna wide-band flexible radome, its surroundings are fixed on the enclosure around the antenna, and is opposite to the reflection surface of the antenna. The fiber textile structure layer is composed of multiple layers, and the side of the radome facing the antenna reflection surface is provided with a tensioning element for connecting the traction mechanism. The traction mechanism is connected to the inner wall of the enclosure, and the radome can be turned into a The tractive force that forms the concave surface acts on the radome. The radome with this structure has good wave permeability, and it is not necessary to select the thickness of the radome according to the working wavelength of the antenna. Using a radome with a uniform thickness can obtain lower antenna insertion loss in multiple frequency bands, which can meet the use of multi-band microwave antennas. In a relatively wide frequency range, the versatility of the radome is realized, overcoming the traditional Radomes made of ABS and other materials have the disadvantage of differences due to different frequency bands.

The invention discloses a control method for triggering a variable pitch action instruction of a wind driven generator according to a mean value. According to a variable pitch control policy for the case that the wind speed fluctuates up and down around the rated wind speed of the wind driven generator, when a variable pitch system detects that the rotating speed, the output power or the wind speed of the generator is higher than the rated value, the variable pitch system starts acting to adjust the pitch angle of a fan paddle and reduce the fan capture power so as to keep the output power of the wind driven generator stable. The past control methods only concentrate on stable control on the output power; however, due to the randomness and instability of wind, the wind speed is possible to fluctuate up and down around the rated wind speed of the wind driven generator and the rotating speed and the power of the wind driven generator also fluctuate up and down around the rated values, and consequently, the variable pitch system is leaded to frequent actions to result in fatigue loss of the variable pitch system. The invention provides a wind driven generator variable pitch control method base on a mean value algorithm, and the control method is capable of greatly improving the action smoothness of the variable pitch system, reducing the fatigue loss and improving the reliability of the system.

The invention discloses an axle box built-in side beam based on a novel primary spring seat, and belongs to the field of railway vehicle bogie side beam devices. The axle box built-in side beam comprises two primary steel springs, two primary vertical shock absorbers, a forged piece side beam device and two wheel set built-in primary suspension axle box devices, and the forged piece side beam device comprises a forged piece side beam lower cover plate, a forged piece side beam upper cover plate, a central single vertical plate, two forged piece cap cylinders, two forged piece vertical shock absorber hanging seats, two forged piece brake hanging seats, two oblique transition connecting seats, two forged piece cross beam pipe connecting seats and a plurality of forged piece milling residualrib plates, which are integrally formed. One corresponding forged piece cross beam pipe connecting seat on each of two forged piece side beam devices is connected with corresponding shell side beam connecting columns at the two sides of a conventional cross beam pipe or a longitudinal motor shell through bolts, so the mounting efficiency is improved, the influence of welding deformation on the framework structure is avoided, the outline size and the turning radius of the framework are remarkably reduced, and the curve passing capacity of the framework is improved.

The invention discloses a power variable stay cable permanent magnet eddy current retarder and belongs to the field of bridge structural vibration control. The power variable stay cable permanent magnet eddy current retarder comprises a rigid shaft, a second linear movement mechanism, a fixed disc, a conductor disc, a driving gear, at least three driven gears of different radiuses, and at least one pair of permanent magnets opposite in magnetic poles; one end of the rigid shaft is connected with the second linear movement mechanism, and the other end of the rigid shaft sequentially penetratesthrough the fixed disc, the conductor disc and the driven gears; the fixed disc is fixed relative to the rigid shaft, the conductor disc is fixed relative to the driven gears, and the driven gears areconnected with the rigid shaft through bearings; the permanent magnets are arranged on the surfaces of the fixed disc. According to the power variable stay cable permanent magnet eddy current retarder, the conductor disc moves inside the magnetic field of the permanent magnets to cut magnetic lines to produce eddy current damping and accordingly to dissipate vibrating energy of a stay cable and inhibit vibration of the stay cable; through engagement between the driven gears different in radius and the driving gear, the energy consumption power can be adjust, high adaptability to external loadcan be achieved, and the power variable stay cable permanent magnet eddy current retarder can be in an optimum load operating sate for a long time.

The present disclosure relates to a fatigue-resistant rivet. The fatigue-resistant rivet contains a vibration-damping alloy, and the vibration-damping alloy contains iron, aluminum, manganese, copper, and graphene; relative to 100 parts by weight of the vibration-damping alloy, iron The content is 35-65 parts by weight, the content of aluminum is 15-35 parts by weight, the content of manganese is 10-25 parts by weight, the content of copper is 4-12 parts by weight, and the content of graphene is 0.005-0.5 parts by weight. The fatigue-resistant rivet of the present disclosure can convert vibration energy into heat energy, reduce fatigue loss, thereby improving the fatigue resistance strength of components, reduce vibration noise, improve hearing comfort, and improve the safety factor of the rivet connection method.

The invention relates to a micro-driver in the technical field of MEMS, and belongs to a segmented-type double-layer membrane electric heating drive MEMS switch with a compliant mechanism. The switchcomprises a substrate, a segmented-type double-layer membrane electric heating drive unit, a base, and an electric contact unit. The double-layer membrane electric heating drive unit, the base and theelectric contact unit are located on a substrate, and the double-layer membrane electric heating drive unit is fixed on the base. The base is fixedly connected with the substrate, and the electric contact unit is disposed above the segmented-type double-layer membrane electric heating drive unit. The electric contact unit comprises a static contact point, a V-shaped support beam, a flexible spring, and an arc-shaped electric contact mass block. The V-shaped support beam is fixed above the segmented-type double-layer membrane electric heating drive unit, and the arc-shaped electric contact mass block is connected to the V-shaped support beam through the flexible spring. The static contact point is disposed above the arc-shaped electric contact mass block, and the static contact point cooperates with the arc-shaped electric contact mass block, and is connected with a peripheral circuit.

The invention relates to an oil-well pump capable of direct flushing. The oil-well pump is underground equipment which has the effects of sand prevention, gas prevention, wax prevention and high pump efficiency and is applied to oil exploration industry. In the oil-well pump, an upper plunger piston and a lower plunger piston are equipped with sand prevention slots, can send the sands deposited in the sand prevention slots to the underside of the pump to realize sand prevention. When the plunger pistons fall to a pump-bumping position, oil pipes above and below the pump are in communicated state by a pump cavity, thereby realizing the function of direct flushing. In the oil-well pump, an oil inlet valve can be opened easily under the hydraulic feedback action, thereby increasing the fullness coefficient, reducing the bend of a sucker rod, increasing the effective stroke of the pump, preventing air lock, reducing the fatigue loss of the sucker rod, and the oil-well pump has the functions and the characteristics of gas prevention and high pump efficiency.

The invention discloses a detachable electric lifting module and belongs to the field of lifters. The detachable electric lifting module comprises a carrying module used for providing the weight of anobject and having the overweight warning function, a lifting module used for driving the carrying module to rise and drop, a fixed module used for being fixed to a mobile device and an energy storagemodule used for storing hydraulic energy generated by the object during dropping and reducing the bearing capacity of the lifting module. The detachable electric lifting module is provided with a double-lifting mechanism, is quick and accurate in rising and dropping and free of vibration. The wear rate of a driving component is low. Moreover, the detachable electric lifting module can improve themechanical efficiency or the energy utilization rate and has the weighing and overweight warning functions.

The invention provides a shock absorbing shaft seat device for motor suspension and belongs to the field of a suspending device for a motor of a rail vehicle. The shock absorbing shaft seat device comprises a rubber node, an eccentric wheel axle sleeve seat, a vertical bearing lifting seat and a vertical shock absorbing pin mechanism, wherein the rubber node acts as a horizontal elastic shaft component; and the eccentric wheel axle sleeve seat comprises an axle sleeve, a bearing lifting seat connecting plate and a rubber node shaft sleeve which are formed integrally. The shock absorbing shaftseat device provided by the invention makes a motor housing base plate obtain symmetric stability mechanically structurally, makes the stress distribution between an axle and the motor housing base plate be more reasonable, also achieves the effects of optimizing the structural balance performance, reducing fatigue losses of materials and prolonging the service life of equipment, and makes the parameter range of the value of an air gap from a linear motor suspended at a special linear motor lifting seat to a sensing plate on a special rail for the linear motor completely meet the optimal design requirements of the linear motor.