227results about How to "Reduce stress levels" patented technology

The invention belongs to the field of wind power generation, in particular to a damping composite type variable rigidity vibration attenuating support for a gearbox of a wind powered generator. The support mainly comprises an upper yoke (1), a lower yoke (3), four hollow vertical columns (2), an upper elastic body (4), a lower elastic body (4), an upper base (5) and a lower base (5), wherein the upper yoke (1), the lower yoke (3) and the four hollow vertical columns (2) form a combined type main frame of the vibration attenuating support; a viscoelastic damping vibration attenuating layer (11) is compounded on the main frame; after being respectively combined with the upper base (5) and the lower base (5), the upper elastic body (4) and the lower elastic body (4) are respectively fixed on the upper yoke (1) and the lower yoke (3); the vibration attenuating support is connected to the main machine frame (6), and a gearbox torque arm (9) is arranged between the upper elastic body and the lower elastic body. The invention has the characteristics of light dead weight and low cost, the rigidity of the vibration attenuating support can form a non-linear change along with the increase of loads, and the vibration attenuating support has damping attenuation capability and further reduces the transfer of the vibration and the noise of a system to a lower foundation.

The invention discloses a semiconductor packaging method of wafer level silicon-based through hole, belonging to the field of semiconductor packaging. The packaging method substantially comprises the following steps: 1, making a cavity structure on a cover plate; 2, bonding the front surface of the cover plate with the front surface of a wafer through a bonding machine; 3, grinding the rear surface of the wafer by a grinder, and implementing a stress plasma etching on the rear surface of the wafer; 4, removing all silicon belonging to a scribe line region starting from the rear surface of the wafer; 5, etching the rear surface of the wafer in order to form silicon through holes, and exposing a bonding pad; 6, making passivation layers, metal layers and solder mask layers sequentially in the rear surface of the wafer and the silicon through holes, so as to compose a redistributed circuit layer, thereby conducting the solder pad to a designated solder ball position on the rear surface of the wafer; 7, making solder balls and cutting along the scribe line. By the implementation of the semiconductor packaging method of wafer level silicon-based through hole, the yield rate of wafer cutting technique is increased, the stress level in package structure is reduced, and the boundary dimension of the package structure is decreased.

A method for forming shallow groove isolation in semi-conductor device comprises that: a mask film layer is formed on the underlayer of the semi-conductor; the mask film layer is made into a design to expose the underlayer of semi-conductor opposite to the position of the groove; the underlayer is corroded to form a groove and a padding oxidizing layer in the groove; a first insulating medium and a second insulating medium are deposited in turn until the groove is filled fully; a quick flash annealing process is carried out onto the underlayer of the semi-conductor; the insulating mediums are made flat to form a shallow groove isolation structure. The shallow groove isolation structure of the invention comprises the underlayer of the semi-conductor and the grooved formed in the underlayer. The groove is filled with insulating mediums, comprising the first insulating medium and the second insulating medium. The first insulating medium and the second insulating medium are piled against each other, forming a stack structure. The invention effectively controls the stress of the shallow groove isolation structure, thus improving the properties of semi-conductor devices.

The invention discloses a fibrous-composite-wound pressure container with a thin-walled metal lining and a manufacturing process thereof. The pressure container is characterized in that a lining barrel body section is of a thin-walled metal tube structure, and the wall face of the lining barrel body section is corrugated; the pressure container further comprises an elastic material filling layer wrapped outside the lining barrel body section; a fibrous composite winding layer is wrapped outside the elastic material filling layer and a lining end closure section. The manufacturing process of the pressure container includes the steps of S1, manufacturing the lining through a thin-walled metal material, S2, wrapping elastic materials outside the lining barrel body section and S3, winding fibrous composites varnished in resin on the outer surface of the elastic material filling layer in a layered mode and carrying out curing molding. According to the pressure container and the manufacturing process thereof, the lining, the fibrous composite winding layer and the adjacent layers are not prone to debonding or failures.

The invention discloses a bed-parallel drilling slot pressure relief permeability increase method which includes the steps: (1) performing construction on bed-parallel gas extraction drilling by the aid of a high-pressure hydraulic slotting device to form a drilled hole according to bed-parallel gas extraction drilling design requirements; (2) leading high-pressure water into the high-pressure hydraulic slotting device without withdrawing a drill to rotatably and circumferentially cut coal to form a disc-shaped slot; (3) withdrawing the drill after the disc-shaped slot is formed, and radiallycutting the coal without rotating a drill bit and a drill rod to form a radial slot; (4) repeating the step (2) and the step (3), and forming a plurality of disc-shaped slots and a plurality of radialslots in the same drilled hole; (5) repeating the step (1) to the step (4), and performing drilling and slotting on the other bed-parallel drilled holes. According to the method, horizontal and vertical stress of a coal layer is reduced, drilling gas extraction concentration and flow is improved, the bed-parallel drilling number of a working surface is decreased, and the method is simple and convenient to operate.

The invention discloses a preparation method of a wide-forbidden-band semiconductor flexible substrate, in particular to a preparation method of a GaN, AlN and SiC monocrystal flexible substrate, belonging to the technical field of microelectronics. The theory of the flexible substrate is introduced into the preparation process of a wide-forbidden-band semiconductor homoepitaxial substrate, the flexible substrate consists of a wide-forbidden-band semiconductor flexible function layer and a supporting substrate, and the thickness of the flexible function layer is 20-50nm. By using the flexible substrate, the defect density and the stress level of epitaxial materials are reduced and the crystal quality of the epitaxial materials is greatly improved; and the wide-forbidden-band semiconductor flexible substrate prepared by adopting the method has the advantages of large size and easiness in industrialization.

The invention discloses a fabricated combined bridge deck structure provided with a grid type connector and a construction method thereof. The combined bridge deck structure is formed by assembling at least two steel plate-fiber concrete combined type components. Each steel plate-fiber concrete combined type component comprises a steel bridge deck slab located on the lower portion and prefabricated fiber concrete pieces poured on the steel bridge deck slab. One grid type connector is arranged in the butt joint area of every two adjacent steel plate-fiber concrete combined type components. The grid type connector comprises cast-in-place fiber concrete pieces and grid reinforcement components fixedly connected to the corresponding steel bridge deck. The grid reinforcement components is completely covered with the prefabricated fiber concrete pieces located on the two sides of the butt joint area and the cast-in-place fiber concrete pieces located in the butt joint area. The prefabricated fiber concrete pieces and the cast-in-place fiber concrete pieces are connected through the grid reinforcement components, so that an integrated fiber concrete layer is formed. The two adjacent steel bridge deck slabs are fixedly connected to form an integrated steel bridge deck slab layer.

The invention relates to a tire having a radial casing reinforcement, consisting of at least one layer of metal reinforcement elements, said tire including a top reinforcement (5), itself radially covered with a tread (6), said tread being joined to two beads (3) via two sidewalls. According to the invention, the metal reinforcement elements of at least one layer of the casing reinforcement (2) are non-reinforced cables having, in the so-called perviousness test, a displacement of less than 20 cm3/mn, and in a radial plane, at least on a portion of the meridional profile of the tire, the rubber mixture thickness (E) between the inner surface of the tire cavity and the point of a metal reinforcement element of the casing reinforcement nearest to said inner surface of the cavity is less than or equal to 3.5 mm, and the rubber mixture thickness ratio between the inner surface of the tire cavity and the point of a metal reinforcement element of the casing reinforcement nearest said inner surface of the cavity of two separate portions of the tire is greater than 1.15.

The invention discloses a flexible connector arranged between ultra-large offshore floating platform modules and a butt joint method. The flexible connector comprises a slide column, a supporting seat, spring steel plates, slide blocks and a fixing seat; the front end of the slide column is provided with a hinge head, the supporting seat is connected to the rear end of the slide column, the springsteel plates are vertically connected to the supporting seat in pairs, and the slide blocks are connected to the two ends of the spring steel plates; the outer wall of the slide column is sleeved with a slide sleeve, the slide sleeve is closely sleeved with a rubber sleeve, and the rubber sleeve is embedded in a through hole formed in the fixing seat; the flexible connector is installed in an inner cavity of the platform module through the fixing seat, and the slide blocks make contact with the top surface and the bottom surface of the inner cavity of the platform module; the adjacent platform modules are connected through a hinge joint and a pin shaft of the flexible connector, and the slide column drives the slide blocks to move when moves along the slide sleeve. When transverse or vertical shearing force is applied to the hinge joint, the rubber sleeve is extruded to be deformed, and the transverse rigidity and the vertical rigidity of the connector are ensured. When the hinge joint is stretched or compressed, small rigidity in the longitudinal direction is achieved through the spring steel plates, and the stability of a floating body is ensured while the load of the connectoris decreased.

Provided is an bainite austempering process of GCr15 steel bearing rings, which firstly heats GCr15 steel bearing rings to the temperature of 870 DEG C, then the GCr15 steel bearing rings are placed in the 50% KNO3+50%NaNo2 nitrate solution to be isothermal and is taken out after four hours of isothermal time. The bearing rings treated by the technology have high tenacity and long fatigue life. In particular, the service life of the working bearings under heavy load and impulse can be prolonged and the operation reliability of the bearings can be increased.

The invention provides a storage box with a large-concentrated-force integrated diffusion structure. The storage box comprises a wave distribution radial short shell, a reinforced bending-resistant Y-shaped ring and a triangular grid radial barrel segment. The middle of a wave-shaped base of the wave distribution radial short shell is a wave-shaped structure with the middle being sunken and the two sides being protruded, and the two sides of the wave-shaped base are conventional arc bases. Component force of all radial diagonal ribs in the action direction of the concentrated force is the same. Trapezoid transition ring ribs are located on transition regions of the radial diagonal ribs and uniform grids, and the uniform grids are located on the two sides of a radial rib region. The outer surface of the reinforced bending-resistant Y-shaped ring is provided with a plurality of reinforced grids, and the inner surface of the Y-shaped ring is additionally provided with an arc bending-resistant groove. The triangular grid radial barrel segment is formed by welding four identical radial triangular grid wall plates. By means of the storage box, pressure stress on a concentrated load action line can be effectively lowered, and influences of the concentrated load on an internal pressure thin wall oxygen tank are weakened through matching and coordination of all structures and step-by-step diffusion.

The invention discloses a design method of shape optimization of a tee, which is carried out according to the following steps: first, a finite element analysis model and a corresponding mathematical expression of static structural analysis are built, then the displacement vector, strain vector and stress vector of a node are calculated; the total correction value and the component at the normal direction at the node are calculated; according to the determined total correction value and the component at the normal direction at the node, the node coordinate is corrected; the structure after correction is carried out stress calculation and test. The design method of shape optimization corrects the existing tee structure design, bases on finite element model, moves a high stress node along the direction of the outer normal on the structure surface by proportion, moves a low stress node along the opposite direction of the outer normal on the structure surface by proportion, and finally obtains a tee structure with a more suitable geometric shape and effective reduction of structure stress concentration.

The invention provides a strength theory based welding design method, and belongs to the technical field of welding. The welding design method comprises steps as follows: (1), actual measurement; (2), CAE (computer-aided engineering) analysis on a welding simulation part; (3) CAE analysis on a whole welding workpiece; and (4), improvement of an established welding method for a corresponding welding seam to reduce the maximum stress sigma max till the minimum safety factor N of the welding seam falls into the corresponding safety factor range of the welding seam. The welding design method can pointedly reduce stress levels of some welding seams and improve the safety factor, so that the welding debugging process is simple, and load-carrying property of the welding seams are effectively and integrally improved.

The invention discloses a thickness optimization design method for thermal barrier coatings (TBCs) of a turbine blade, and belongs to the technical field of surface coating protection. Representative nodes uniformly distributed on the turbine blade are selected, the states of local regions are reflected by temperatures and stress results of representative node positions, and TBCs thickness analysis of a complex blade is equivalent to thickness optimization design of a finite number of representative node positions, so that the analysis calculation amount is reduced; a mathematic formula is established for reflecting design objectives of high heat insulation performance, low stress level and low preparation cost, calculation is performed by introducing a multi-objective optimization algorithm to obtain optimal ceramic layer thickness of each representative node position, and a total objective function value is taken as a TBCs thickness optimization design and evaluation parameter of the blade, so that the advantages and disadvantages of a TBCs thickness distribution scheme can be quantitatively evaluated and the shortcoming that an existing method only can perform qualitative evaluation is overcome; and the method can ensure the service safety of the coatings and improve the usage efficiency of the coatings.

The invention provides a shaft-type part multi-arc chamfer designing method. The method comprises the steps that (1) a shaft-type part is provided, and three-dimensional drawing software is used for conducting three-dimensional CAD modeling on the shaft-type part; (2) multi-arc parametric modeling is conducted at the positions of two perpendicular edges at the shaft step position of a small-diameter section and the shaft step position of a large-diameter section. When the multi-arc chamfer designing method is applied to step chamfer structural design of a general industrial shaft-type part, the stress level at the position of a step chamfer of the shaft-type part is lowered; the service life of the shaft-type part is prolonged; the service efficiency of materials of the shaft-type part is improved.

The invention relates to a 66kV burst short circuit transformer. A three-phase three-limb iron core is arranged in a lower fuel-saving box of the transformer. The iron core is sleeved with a low-voltage coil and a high-voltage coil. Wires are led out from the head end of the high-voltage coil and the head end and tail end of the low-voltage coil in the axial direction, and are led into a sleeve through cables. The high-voltage coil is of a fully continuous structure, wherein every two of three composite conductors are wound in parallel in the radial direction. A subsidiary pressing plate on the high voltage side and a subsidiary pressing plate on the low voltage side are respectively of a fan shape as a whole, and the fan-shaped subsidiary pressing plate on the high voltage side and the fan-shaped subsidiary pressing plate on the low voltage side share the same center of a circle and are placed in a symmetric mode. The subsidiary pressing plates and a pressing plate are provided with positioning holes and are connected through an insulating screw rod. According to the 66kV burst short circuit transformer, the insulation structures of the coils are optimized, ampere-turn balance of the coils is improved, horizontal eddy current loss of the coils is lowered on the premise that insulation reliability is guaranteed, the stress level of the coils is lowered substantially at the time of a short circuit, the capability in resistance to the short circuit of a product is enhanced, and a basis is provided for further optimization of a product design.

A system for generating and matching profiles of people for ride sharing comprises a processor to process physiological data of users collected by sensors in the vehicles, driving data collected by sensors in the vehicles, and lifestyle data of the users. The processor generates user profiles based on the physiological, driving, and lifestyle data. The user profiles include correlations between the data and stress levels of the users during the use of the vehicles. A network interface receives the physiological, driving, and lifestyle data from the vehicles; receives a request from a first user to share a ride in a vehicle; receives information from the processor about a second user having a user profile compatible to the first user; and sends a response to the first user including the information about the second user to allow the first user to share the ride in the vehicle with the second user.

The invention provides a gradient elastic non-pneumatic tire. The gradient elastic non-pneumatic tire comprises a supporting structure and an annular belt; a tire tread is fixed to the surface of the annular belt; the annular belt is formed by a square net in a surrounding mode; the supporting structure comprises an inner fixing ring, a gradient elastic spoke and an outer fixing ring; the inner fixing ring is installed on the outer side of a wheel rim; the outer fixing ring is installed on the inner side of the annular belt; the gradient elastic spoke is located between the inner fixing ring and the outer fixing ring; the gradient elastic spoke comprises rigid layers and flexible layers; the rigidity of the radial structure of the rigid layers is higher than that of the radial structure of the flexible layers; the rigid layers and the flexible layers are distributed alternately in the radial direction of the tire; the number of the rigid layers is larger than that of the flexible layers; and the rigidity of the radial structure of the flexible layers is increased as the radial diameter of the tire is decreased gradually. Through arrangement of the flexible layers and the rigid layers, the whole non-pneumatic tire has the lower stress level when deforming, the service life of the non-pneumatic tire is prolonged advantageously, and the excellent ground gripping capacity is obtained.