39 results about "Stress equilibrium" patented technology

A method for designing a drill bit including selecting a characteristic associated with a failure mode. A first value of the characteristic of a first cutting element and a second value for the characteristic of a second cutting element are determined. The method also includes determining whether a difference between the first value and the second value is within a predetermined range. A cutting element design parameter for the first cutting element is adjusted if the difference is outside the predetermined range. The determining first and second values, determining the difference, and adjusting a cutting element design parameter are repeated until the difference is within the predetermined range.

The invention relates to a high-temperature pressure sensor and a manufacturing method thereof, and belongs to the field of micro-mechanical manufacturing. The high-temperature pressure sensor comprises a silicon substrate, sensitive elements arranged on the substrate, middle substrates, and upper layer silicon sheets. The middle substrates are arranged on the silicon substrate and made of high temperature resisting non-conductive materials. The upper layer silicon sheets are arranged on the middle substrates. The silicon substrate, the middle substrates and the upper silicon sheets are successively bonded. Cavity bodies for collecting the sensitive elements are arranged between the silicon substrate and the middle substrates. According to the invention, the silicon substrate, the middle substrates and the upper silicon sheets are successively superposed to form a silicon substrate-middle substrates-silicon sheets sandwich structure, so stress mismatch is mutually counteracted and stress balancing is achieved; and by adopting the manufacturing method of the high-temperature pressure sensor, the above mentioned effects can be achieved.

The invention discloses a two-way stretch tester and a testing method for an internal pressure thin-wall cylinder test sample of a geomembrane. Due to the adoption of the tester and the testing method, provided by the invention, the problem in stress equilibrium of a cross-shaped test sample on the plane of the geomembrane in a two-way stretch test can be solved, meanwhile, the problem that the traditional internal pressure thin-wall cylinder test is not suitable for flexible materials such as the geomembrane is solved, and finally the two dimensional stress strain curve of the geomembrane under the condition of two dimensional stress can be obtained accurately.

The invention discloses a complex heterogeneous soil internal tubular pile longitudinal vibration analysis method based on a viscous damping model, and belongs to the field of civil engineering theoretical analysis. The method comprises the steps that a tubular pile-soil coupling vibration system is divided into multiple layer sections in the longitudinal direction at first, pile periphery soil ineach layer section pile in the longitudinal direction is divided into an internal disturbance area and an external area in the radial direction, the internal disturbance areas are divided into multiple circle layers in the radial direction, soil in each circle layer is the homogeneity isotropy linear viscoelastic body, soil in the external areas is infinitely extended in the radial direction, andviscous damping is adopted for soil material damping; pile soil interfaces and circle layer soil interfaces are continuous in two-side displacement and balanced in stress, and pile soil system vibration is small deformation; pile body concrete is the liner linear elastic body, and transmission of stress waves in pile bodies meets plane cross-section assumption; and pile periphery, pile core soiland pile body longitudinal vibration equations are built, the three vibration equations are solved, and a time domain speed response function of any excitation force acting on pile tops is obtained through transfer performance of a pile body damping function among the longitudinal layer sections.

The invention belongs to the technical field of unconventional oil and gas output increasing transformation, and particularly relates to a re-fracturing process design method for improving the shale seamed web complexity. The method includes the steps that re-fracturing well sections are selected according to basic data of all the well sections as well as gas-bearing data and primary fracturing output increasing transformation volume ratio data; as for the candidate well sections, a stress balancing equation of discrete fractures is established, normal stresses of a fracture unit are calculated, and steering pressure of new fractured shale stratum fractures is obtained; the strength and dosage of a temporary plugging agent are determined according to the fracture height, particle sedimentation rate, fracture width and temporary plugging agent particle density as well as the number of primary fracturing seamed webs; and steering extension construction displacement of the re-fractured seams is calculated and designed. The re-fracturing process design method provided by the invention covers the basic procedures of shale re-fracturing design, the shale re-fracturing process design canbe achieved conveniently, rapidly and effectively, and a technical design method is provided for re-fracturing process mine field implementation.

The invention discloses a method of optimizing stress equilibrium in a switching power supply, which comprises steps: a first diode is used for building an energy matching relationship among a first capacitor, an inductor and a transformer, that is, when a switching tube is conducted, an exciting circuit of the inductor and an exciting circuit of the transformer are separated via the first diode, when the switching tube is cutoff, the inductor and the transformer are connected via the first diode, within a half power frequency cycle, the first capacitor is divided into a charging period and a non-charging period, and when the first capacitor is in the non-charging period, the first diode is in a non-conduction period; the average power when the first capacitor is in the charging period and the average power when the first capacitor is in the discharging period are regarded as the same; and according to the energy matching relationship among the inductor, the first capacitor and the transformer, the principle of conservation of energy is used, and the inductor parameter selection range is calculated by the capacitance value of the first capacitor, the transformer turn ratio and the source-side winding inductance. Compared with the prior art, voltage stress of each element can be balanced, and electromagnetic interference caused by a large voltage change rate can be reduced.

The invention discloses a bearing detachment device. The bearing detachment device comprises a base used for abutting and clamping bearings and driving the bearings to move, and a traction mechanism connected with the base, wherein the base comprises alignment mandrels used for abutting and clamping the bearings and uniformly distributed in the circumferential direction, the alignment mandrels are connected with a first screw rod used for pushing the alignment mandrels to move to adapt to clamp the bearings with different dimensions, and the first screw rod is screwed onto the base; and the traction mechanism is connected with a rotation mechanism through a thread, and the rotation mechanism drives the traction mechanism to move through the reaction of the thread. The bearing detachment device is applicable to detachment for the separable angular contact bearings, and capable of meeting the detachment need of the bearings with different types and dimensions through adjusting the dimensions of the base; the stress equilibrium of the bearings is guaranteed, detachment traces left due to partial overload are avoided, and a main shaft is prevented from scratches; and the bearing detachment device can be used for the bearings next to mating parts and is capable of avoiding detachment traces left on the adjacent mating parts.

A method for analyzing fatigue crack propagation of particle composite material is provided. First, according to the initial geometric conditions, The equivalent inclusion method is used to obtain thestress field distribution of the structure without cracks and only with particles, and then the continuous dislocation is used to simulate any number of broken line cracks in the matrix. The singularintegral equations are established according to the stress equilibrium conditions on the line of the cracks. The stress intensity factors of each crack can be obtained by solving these singular integral equations. After one step of crack propagation, a new fracture line crack can be obtained by adding a crack branch to the original fracture line crack. The new crack tip position can be recorded,and then a new singular integral equation can be established to solve the problem, so that the stress intensity factor of the new crack can be obtained. In this way, the automatic crack propagation analysis of particulate composites can be realized after many cracks are manipulated. When the invention carries out the crack propagation analysis of the multi-particle and the multi-crack, the modeling is very fast, and the calculation speed is also fast.

The invention provides a large centrifugal blower which comprises a shell. An impeller shaft penetrates through the center of the shell and is embedded into an impeller. A connecting plate is fixedly arranged on the side, close to the impeller, of the inner side wall of the shell. A spraying and blowing mechanism is fixedly arranged on the connecting plate and communicates with a stable-pressure gas storage tank. The spraying and blowing mechanism comprises an annular airflow distributor and a plurality of nozzles uniformly arranged on the circular surface of the annular airflow distributor. Compared with the prior art, the large centrifugal blower has the following beneficial effects that compressed air is sprayed and blown onto blades of the blower, so that the whole impeller of the blower is driven to rotate, then the blower is started after the speed is uniform, and accordingly, a starting load of the blower is reduced; and the annular distributor sprays and blows the impeller of the blower to generate couple, so that stress equilibrium of the impeller of the blower during starting is guaranteed.

The invention discloses a rubber strip winding machine. The rubber strip winding machine comprises a rack, bottom studs, a winding shaft, a winding motor, a guiding wheel, a pulling wire sensor, sliding sleeves, guiding rods, guiding rollers, a supporting rod, a sliding block, two guide rails, a reset sensor, a supporting base, a base, a lead screw and a stepping motor; the guiding rods which arevertically arranged are located on the feeding side of the winding shaft and installed on the lower portion of the side wall of the rack through U-shaped channel steel; the sliding sleeves are vertically and slidably connected with the guiding rods; a pulling rope of the pulling wire sensor is connected with the sliding sleeve; the guiding rollers are located between the winding shaft and the guiding wheel, arranged on the upper portion of the rack and installed on the front portion of the supporting rod; the back portion of the supporting rod penetrates through the rack and is connected withthe sliding block; the sliding block is arranged on the two guide rails in a sleeving mode; the ends of the guide rails are installed on the supporting base; the supporting base is installed on the rack through the base; and the stepping motor is installed at the tail of the supporting base, a rotation shaft of the stepping motor is connected with the lead screw, and the lead screw is in threadedconnection with the sliding block. According to the rubber strip winding machine, in the whole winding process of rubber strips, stress equilibrium of the conveyed rubber strips can be always kept, and the fracture phenomenon can not be generated.

The invention relates to a wire feeding / drawing device and a method thereof, which are used for feeding gold wires to a wire-welding machine. The wire feeding / drawing device comprises an electric motor component, a coil rack component and a conducting wire component, wherein a gold wire coil is assembled on the coil rack component; and a gold wire can pass through the conducting wire component. The conducting wire component comprises at least one air nozzle component, an upper wire-passing plate and a lower wire-passing plate matched with the upper wire-passing plate, wherein a gap is reserved between the upper wire-passing plate and the lower wire-passing plate; and an air nozzle faces the gap. The electric motor component drives the coil rack component to release the gold wire, and the gold wire passes through the gap and reaches the wire-welding machine. As the gold wire is light, the releasing stress equilibrium of the gold wire is disturbed, and the blowing of the air nozzle component of the conducting wire component can ensure that the gold wire in the gap can quickly and automatically achieve stress equilibrium so as to maintain the feeding track of the gold wire. Meanwhile, by adjusting the air flow of the air nozzle component, the tension of the gold wire can be controlled, thereby solving the problems of the scratch, deformation and even breakage of the gold wire and improving the smoothness of wire feeding and the efficiency of welding.

A rotating blade row is provided for the final stage of a steam turbine has blades with an integrated shroud. The shroud of each blade has a projection in the axial direction, in each case on its pressure side, which prevents droplets in the working fluid of the steam turbine from reaching the shroud fillet of the respective subsequent blade in the flow direction. The shroud fillet is therefore protected against erosion damage caused by droplets impact erosion. The projection is positioned and of such a size that mass equilibrium is ensured between the suction side and the pressure side of the shroud, and stress equilibrium is ensured between the projection on the pressure side and the suction-side shroud. The projection furthermore has a recess between its greatest axial extent and the leading edge.

Disclosed are a self-equalization multi-bundle pre-stressed anchor cable connection structure and a construction method thereof. Pre-stressed anchor cables are symmetrically anchored on the left sideand the right side of a fender pile body, and free segments of the pre-stressed anchor cable encircle the fender pile body on the front side of the fender pile body and are crosswise fixed through anchor cable connectors. Each anchor cable connector comprises two steel cushion blocks which are symmetrically arranged on the left and the right, and a spring is arranged between the two steel cushionblocks. A threading hole in the rear portion of a drive anchoring block and an anchoring hole in the front portion of a driven anchoring block form a first hole channel for driven anchoring pre-stressed anchor cables to run through, and a threading hole in the rear portion of the driven anchoring block and an inner side hole of an anchoring hole in the front portion of the drive anchoring block form a second hole channel for drive anchoring pre-stressed anchor cables to run through. The self-equalization multi-bundle pre-stressed anchor cable connection structure and the construction method thereof avoid using a profile steel enclosing purlin, effectively save steel materials, reserve sufficient construction space for a foundation trench, and meanwhile can guarantee that each fender pile bears simple and clear stress and keeps balance, greatly improve foundation pit supporting safety, and improve stress equilibrium of multiple bundles of the pre-stressed anchor cables and the foundation pit supporting safety.

The invention provides a photoresist stripping liquid composite, wherein the photoresist stripping liquid composite is composed of an organic silicon compound, an acrylate copolymer and an organic solvent. When acting as a surface active agent, the photoresist stripping liquid composite provided by the invention is added with the organic silicon compound; and when acting as a stress equilibrium agent, the photoresist stripping liquid composite is added with the acrylate copolymer, therefore the dissolubility and the stripping property of the photoresist are improved; and the residual or penetration pollution problem of the photoresist is solved.

A dynamic uniaxial bidirectional compression experiment method for brittle materials adopts an electromagnetic separation type Hopkinson pressure bar bidirectional loading device, and a sample to be tested is clamped between the end faces of two incident bars. When the device is used for carrying out dynamic synchronous bidirectional loading on a test sample, two electromagnetic stress wave generators with identical parameters need to be connected in parallel into a charging and discharging circuit composed of a capacitor, a crystal diode and other components and be attached to the two incident bar end faces which are equal in length and made of the same material. When the capacitor discharges to the stress wave generators, current can equally enter the two stress wave generators, and twoidentical stress waves are generated in the two incident rods, so that the internal stress balance state of the brittle test sample can be realized in a shorter time, and more accurate and effective dynamic mechanical property data can be obtained.

The invention discloses a plane multi-crack fatigue propagation analysis method based on distributed dislocation method, firstly, according to the initial geometry and crack conditions, the continuousdislocations are used to simulate the number of broken line cracks in the plane, and the singular integral equations are established according to the stress equilibrium conditions on the line of thecracks, and the stress intensity factors of each crack can be obtained by solving these singular integral equations. After one step of crack propagation, a new fracture line crack can be obtained by adding a crack branch to the original fracture line crack. The new crack tip position can be recorded, and then a new singular integral equation can be established to solve the problem, so that the stress intensity factor of the new crack can be obtained. In this way, the automatic propagation analysis of plane multi-cracks can be realized after many operations.

The invention belongs to the technical field of unconventional oil and gas output increasing transformation, and particularly relates to a re-fracturing process design method for improving the shale seamed web complexity. The method includes the steps that re-fracturing well sections are selected according to basic data of all the well sections as well as gas-bearing data and primary fracturing output increasing transformation volume ratio data; as for the candidate well sections, a stress balancing equation of discrete fractures is established, normal stresses of a fracture unit are calculated, and steering pressure of new fractured shale stratum fractures is obtained; the strength and dosage of a temporary plugging agent are determined according to the fracture height, particle sedimentation rate, fracture width and temporary plugging agent particle density as well as the number of primary fracturing seamed webs; and steering extension construction displacement of the re-fractured seams is calculated and designed. The re-fracturing process design method provided by the invention covers the basic procedures of shale re-fracturing design, the shale re-fracturing process design canbe achieved conveniently, rapidly and effectively, and a technical design method is provided for re-fracturing process mine field implementation.

The invention discloses an electrophoresis buffer for cell in situ electrophoresis, the pH is 8.3, the solvent is water, and the solute is composed of Tris, Glycine and Glucose, wherein the concentration of Tris: 25mM; Glycine: 192mM; Glucose: 43.2mM. Mix the corresponding weight of Tris, Glycine, Glucose with water. The electrophoresis buffer of the present invention can maintain the stress balance of the cells under the condition of maintaining the isotonicity of the cells, select non-polar glucose, and be easy to separate in subsequent centrifugation, cell recovery and the like.

The invention relates to the field of MEMS manufacturing, in particular to a high-temperature pressure sensor and a preparation method thereof. Based on a silicon-on-insulator substrate, a Whist bridge structure is formed on its front side, and a pressure-sensitive film is formed on its back side. Anodic bonding of silicon-glass forms a vacuum cavity, and silicon-glass bonding is used on the back to achieve stress balance, or a single-chip anodic bonding process is used, and finally a pressure sensor with high reliability is prepared by single-chip packaging.

The invention relates to a welding process for a tower door frame. The welding process comprises the following specific steps of S1, coiling a tower drum; S2, forming a hole in the tower drum; S3, beveling a door frame hole; S4, positioning a door frame; S5, performing spot welding positioning; S6, preheating a joint; S7, selecting a welding wire; and S8, welding an inner bevel and an outer bevel.The welding process has the advantages that a second cone part is arranged on the outer edge of the door frame, so that the horizontal accuracy and positioning-embedding size of the door frame embedded in the tower drum are ensured; transverse concentration of the welding stress is avoided; and the reduction of the stress level and stress balance are ensured.

The invention discloses a two-way stretch tester and a testing method for an internal pressure thin-wall cylinder test sample of a geomembrane. Due to the adoption of the tester and the testing method, provided by the invention, the problem in stress equilibrium of a cross-shaped test sample on the plane of the geomembrane in a two-way stretch test can be solved, meanwhile, the problem that the traditional internal pressure thin-wall cylinder test is not suitable for flexible materials such as the geomembrane is solved, and finally the two dimensional stress strain curve of the geomembrane under the condition of two dimensional stress can be obtained accurately.

A fastening structure for a space suit visor, comprising a space suit helmet (1) and a visor (2) mounted on said helmet. The periphery of the visor (2) is provided with a frame (3), and a mounting structure fitted to the helmet (1) is formed on said frame (3). The frame (3) comprises a compression component (31) and a fastening component (32). As the compression component (31) is fitted to the visor (2), pressure is applied to the fastening component (32), thereby producing a prestressing force and fastening the visor (2) in place. In the fastening structure, visor bolt holes are unnecessary, thus the stress equilibrium of the visor (2) itself is not affected, the original strength of said visor (2) is maintained, and no weak spots are introduced therein. A prestressed frame (3) is created about the periphery of the visor (2), forming a structure capable of bearing the stress of the whole of the visor (2) and the space suit helmet (1) such that forces such as pressure differentials borne by the visor (2) can be transferred to the space suit helmet (1) via said prestressed frame (3), thereby ensuring the structural integrity and the stability of the visor (2).

The invention relates to a wire feeding / drawing device and a method thereof, which are used for feeding gold wires to a wire-welding machine. The wire feeding / drawing device comprises an electric motor component, a coil rack component and a conducting wire component, wherein a gold wire coil is assembled on the coil rack component; and a gold wire can pass through the conducting wire component. The conducting wire component comprises at least one air nozzle component, an upper wire-passing plate and a lower wire-passing plate matched with the upper wire-passing plate, wherein a gap is reserved between the upper wire-passing plate and the lower wire-passing plate; and an air nozzle faces the gap. The electric motor component drives the coil rack component to release the gold wire, and the gold wire passes through the gap and reaches the wire-welding machine. As the gold wire is light, the releasing stress equilibrium of the gold wire is disturbed, and the blowing of the air nozzle component of the conducting wire component can ensure that the gold wire in the gap can quickly and automatically achieve stress equilibrium so as to maintain the feeding track of the gold wire. Meanwhile, by adjusting the air flow of the air nozzle component, the tension of the gold wire can be controlled, thereby solving the problems of the scratch, deformation and even breakage of the gold wire andimproving the smoothness of wire feeding and the efficiency of welding.

The invention discloses a bowstring-truss-type plane gate. The bowstring-truss-type plane gate comprises a panel, a plurality of bowstring-truss-type main beams, panel region grid rib beams, main beamstrengthening mechanisms and bearing stiffening ribs; the panel region grid rib beams are used for strengthening the bottoms of the multiple bowstring-truss-type main beams; the main beam strengthening mechanisms are used for strengthening the tops of the multiple bowstring-truss-type main beams; the bearing stiffening ribs are used for strengthening the two ends of the multiple bowstring-truss-type main beams; the upper ends of the multiple bowstring-truss-type main beams are fixedly connected with the panel in a manner of being arranged at equal intervals or being arranged densely at the lower parts and sparsely at the upper parts; the panel region grid rib beams are fixedly arranged among the bottoms of the multiple bowstring-truss-type main beams; the main beam strengthening mechanisms are fixedly arranged at the tops of the multiple bowstring-truss-type main beams; and the bearing stiffening ribs are fixedly arranged at the two ends of the multiple bowstring-truss-type main beams. Bowstring trusses are used as the main beams of the gate, so that the gate has the advantages of large span, small end thickness, handiness, material saving, attractive appearance, stress equilibrium of different components and the like, and the reliability of force transfer between boundary beams and supports is ensured.

The invention relates to the technical field of semiconductor material processing, in particular to a composite substrate structure and a morphology improvement method thereof. The structure comprises a first stress balance layer, a substrate layer, a second stress balance layer, a dielectric layer and a functional film layer which are arranged in sequence, the first stress balance layer and the second stress balance layer are made of the same material and are made of the same process; the first stress balance layer is used for adjusting the thickness of the first stress balance layer according to stress distribution in the composite substrate structure, so that the morphology of the composite substrate structure is improved; the second stress balance layer is used for balancing stress generated when the first stress balance layer is manufactured. In the composite substrate structure, the first stress balance layer is arranged on the back surface of the substrate layer and serves as the stress compensation layer, and when the heterogeneous integrated substrate is prepared, the wafer morphology is optimized by adjusting the thickness of the first stress balance layer, so that the overall morphology of the heterogeneous wafer can be more beneficial to subsequent tape-out processing.

The invention belongs to the technical field of underground engineering design, and particularly relates to an underground engineering surrounding rock-stress double-target mutual feedback combined regulation and control method. According to the underground engineering surrounding rock-stress double-target mutual feedback joint regulation and control method provided by the invention, the cracking coefficient CDI of a local cracking instability area, the pressure equalizing coefficient PEI of a stress concentration disturbance area and the bearing coefficient BCI of a stress balance protolith area of surrounding rock are calculated and obtained through in-situ drilling television camera, a rock stress meter and an acoustic wave testing technology on the section of the underground engineering; and the excavation layering height of the underground engineering and the supporting types, supporting opportunities and supporting lengths of three key links of shallow supporting and surface fixing, ring expanding and cost strengthening and combined bearing are determined, the completeness degree of shallow surrounding rock and the deviation stress increasing degree of deep surrounding rock are actively controlled, and the overall bearing capacity of the shallow surrounding rock and the overall bearing capacity of the deep surrounding rock are fully exerted.

A fastening structure for a space suit visor, comprising a space suit helmet (1) and a visor (2) mounted on said helmet. The periphery of the visor (2) is provided with a frame (3), and a mounting structure fitted to the helmet (1) is formed on said frame (3). The frame (3) comprises a compression component (31) and a fastening component (32). As the compression component (31) is fitted to the visor (2), pressure is applied to the fastening component (32), thereby producing a prestressing force and fastening the visor (2) in place. In the fastening structure, visor bolt holes are unnecessary, thus the stress equilibrium of the visor (2) itself is not affected, the original strength of said visor (2) is maintained, and no weak spots are introduced therein. A prestressed frame (3) is created about the periphery of the visor (2), forming a structure capable of bearing the stress of the whole of the visor (2) and the space suit helmet (1) such that forces such as pressure differentials borne by the visor (2) can be transferred to the space suit helmet (1) via said prestressed frame (3), thereby ensuring the structural integrity and the stability of the visor (2).

The invention discloses a bimetallic interface adaptive loading simulation method based on a selected area stress criterion, which belongs to the field of molecular statics simulation. Firstly, the bimetallic interface model is simulated and the region is divided. The extended box is obtained through the periodic boundary conditions, the neighbor set of each atom in the extended box is established, the volume of each atom is calculated, and the stress in the characteristic region is calculated. If the stress of the upper and lower layers in the characteristic area does not reach the stress equilibrium, for different loading modes, local strain is applied to the variable area of ​​the bimetallic interface model until the stress in the characteristic area reaches equilibrium. Then count the number of failed iterations of applying local strain until the total number of failed iterations is greater than the number of iterations preset by the user, output the current stress in the characteristic region, calculate the bimetallic interface model minimization energy by CG and FIRE methods, and update the atomic coordinates. The invention realizes the internal stress balance of various system states, and obtains the accurate results of the bimetal interface loading simulation.

The invention discloses an internal threaded connection brake valve comprising a three-way valve body and a wedge-shaped flashboard. The three-way valve body comprises a water inlet, a water outlet and a valve neck. The water inlet and the water outlet are formed at two ends of the three-way valve body; and a flashboard operation opening is formed on the valve neck. Internal threads are formed at the water inlet and the water outlet of the three-way valve body respectively. A valve base with a V-shaped cross section is formed in a valve cavity of the three-way valve body. A cavity is formed inside the internal threads of the water inlet and the water outlet of the three-way valve body. The cavity is of a tubular structure with an inner end face which is a slope. The internal threads are connected with the brake valve; the cavity is formed inside the internal threads of the three-way valve body; the inner end face of the cavity 11 is parallel to the slope of the valve base; stress equilibrium of various points and overall performance are guaranteed; material consumption is reduced; and weight of the valve body is controlled.