9 results about "Stress working" patented technology

The invention belongs to the technical field of structure optimization design, and particularly relates to a fiber composite failure safety topological optimization design method and system under a dynamic load, and the method comprises the steps: defining a design domain and related design parameters based on the stress working condition and geometric characteristics of a to-be-optimized structure; carrying out transient dynamic analysis and constructing an equivalent static load for topological optimization, constructing a multi-local failure working condition by taking material density, angle subinterval selection and a fiber angle as design variables, introducing an equivalent directional stiffness matrix continuously related to the fiber angle, and aggregating a multi-working-condition flexibility target by adopting a normalized KS function; failure safety topological optimization iteration and internal and external circulation convergence judgment are carried out in combination with a moving asymptote method, and collaborative optimization of structural topology and fiber orientation is achieved under the dynamic load condition. The problem that it is difficult to consider structural redundancy, failure safety and fiber orientation collaborative design in fiber reinforced composite topological optimization under the dynamic load is solved, and structural safety redundancy and local damage resistance are improved.

The invention discloses a working condition self-adaption-based guide vane connecting rod stress trend diagnosis method, and relates to the technical field of intelligent diagnosis of hydroelectric generating sets, and the method comprises the steps: constructing an optical fiber stress monitoring system, setting an optical fiber grating sensor for a guide vane connecting rod, collecting a stress signal in real time, and collecting operation parameters; the method comprises the following steps: collecting multi-working-condition data within one month of normal operation after overhaul of a unit, calculating a correlation matrix between guide vane connecting rod stress and operation parameters, and establishing a stress working condition self-adaptive analysis model; and calculating a maximum value, a minimum value, an average value and a standard deviation of stress based on rolling statistics, determining a normal range of stress fluctuation, inputting real-time acquired data into a diagnosis algorithm, judging a stress deviation trend according to the reference model, outputting an alarm level, and updating the reference model. According to the method, the accuracy and timeliness of anomaly recognition are improved, the pertinence and the performability of maintenance decision making are enhanced, and the operation safety and the service life management effect of the guide vane connecting rod of the hydraulic unit are improved.

The utility model belongs to bridge construction technical field, concretely relates to a bridge expansion joint auxiliary installation device, including stress working beam, adjusting screw subassembly, support plate subassembly and level gauge, stress working beam is set in the above of bridge expansion joint reserved slot transversely, stress working beam both ends are set on the bridge surface pavement layer of bridge reserved slot both sides, adjusting screw subassembly is connected with stress working beam, support plate subassembly is connected with adjusting screw subassembly, and level gauge is set on the surface of stress working beam, the auxiliary installation device passes through the synergies of stress working beam, adjusting screw subassembly, support plate subassembly and level gauge, has improved installation quality and efficiency significantly, has reduced labour intensity and safety risk, has brought the reduction of comprehensive cost and the promotion of bridge pavement long -term service performance more, has better economic benefit and practicality.

The invention belongs to the field of aerospace equipment, and particularly relates to an actuator cylinder. Comprising a shell, a joint bearing is arranged in the middle of the shell, a roller lead screw is installed in an angular contact bearing, one end of the roller lead screw is connected with a motor through a coupler, the other end of the roller lead screw is connected with a push rod, and a linear position sensor used for detecting the stroke position of the push rod is installed at the upper end of the angular contact bearing. The front end of the push rod is connected into the shell through a bearing, and the shell is in threaded connection with a shell end cover. According to the structural design, various stress working conditions are comprehensively considered, calculation is carried out, it is guaranteed that all part structures have enough rigidity and strength, and a certain safety coefficient and structural reliability are guaranteed; and natural and mechanical environment requirements under normal working conditions can be met, and certain economic benefits can be brought to enterprises.

The invention discloses a magnetic suspension high-speed internal lift pump for deep well mining, and relates to the technical field of fluid machinery, the magnetic suspension high-speed internal lift pump comprises a pump body, the pump body is composed of an upper end cover, a middle shell and a lower end cover which are detachably connected from top to bottom in the axial direction, and a through fluid channel is arranged in the pump body; the integrated overflowing structure is arranged in the fluid channel and comprises a vertical center shaft, spiral blades spirally distributed on the center shaft and an annular shell arranged outside the spiral blades; the motor assembly is contained in the middle section shell and used for driving the integrated overflowing structure to rotate so as to increase the fluid pressure. The main axial load borne by the center bearing is actively shared through the magnetic suspension assembly, the stress working condition of the bottom auxiliary mechanical bearing is effectively improved, and therefore the service life of the bearing and the whole pump body in the deep well high-pressure and high-impurity environment can be prolonged, and the operation reliability is improved.

The application discloses a bidirectional vibration triaxial apparatus capable of keeping absolute phase difference of load and a use method thereof, and belongs to the technical field of geotechnical engineering test. The application can control and keep the absolute phase difference of the axial and radial dynamic load amplitude, and can simulate various stress working conditions including the action of the seismic load. The apparatus has simple structure and simple control system, and can realize stress type control of the axial stress and the radial stress. Under the condition that the sectional area of the loading rod is same as that of the sample, triaxial test of the bidirectional cyclic load of the principal stress rotation and triaxial elongation can be carried out, and the triaxial test has significance for studying the deformation characteristics of the loose granular body (soil body) material under the complex stress working conditions.

The present application belongs to the technical field of bridge structure test loading device, and discloses a composite loading device and loading method capable of correcting the attitude of I-beam, which comprises a plurality of out-of-plane loading devices arranged uniformly along the axial direction of the I-beam test piece and a longitudinal loading device at the center of the top surface of the I-beam test piece; the out-of-plane loading device comprises bidirectional jacks on both sides of the web of the I-beam test piece, which are respectively inner pulling jacks and outer pushing jacks, and the end of the jack is connected with the upper flange plate or the lower flange plate of the I-beam test piece; the force applied by the inner pulling jacks and the outer pushing jacks is equal in size but opposite in direction; the axial spacing L of the jack is consistent with the transverse spacing T; one end of the I-beam test piece is erected on a fixed hinge support, and the other end is erected on a sliding hinge support; a regulating platform is arranged between the hinge support and the I-beam test piece; and the axis of the regulating platform is parallel to the axis of the I-beam test piece. The present application can realize composite loading in the transverse and longitudinal directions, correct the transverse attitude of the beam body, and truly simulate the stress working condition of the beam body.

The application discloses a kind of laser measuring equipment and detection method based on processing of flame-retardant plate, it is related to laser measuring technical field, including support frame, acoustic detection device, flame-retardant plate lifting mechanism, laser detection mechanism.The application realizes the initiative stress excitation detection of the structural strength of flame-retardant plate by the two different working modes of flame-retardant plate lifting mechanism, mode one makes flame-retardant plate present the form of " two ends are raised, middle part is depressed " by double-side synchronous lifting, simulates the stress working condition when plate is subjected to uniform load or large-span support in actual application, to accurately evaluate its overall bending stiffness and elastic modulus;Mode two makes plate produce asymmetric distortion by the way of one-side lifting, the other side static resistance, two modes amplify hidden internal structure hidden danger through macroscopic physical deformation, so that strength detection is more comprehensive and has pertinence.

The invention discloses a conical concrete pole with a prestressed steel bar anchoring head, and belongs to the technical field of concrete poles. Comprising a rod body, a prestressed steel bar is arranged in the rod body, the top end of the prestressed steel bar extends to the position above the rod body, an anchoring head body is integrally formed, a cover plate is arranged on the portion, located on the outer side of the anchoring head body, of the upper surface of the rod body, and a protection mechanism is arranged on the upper surface of the cover plate; the prestressed steel bar and the anchoring head body are integrally formed, so that the connection strength of the prestressed steel bar and the anchoring head is effectively enhanced, the problem of slippage easily occurring in traditional split connection is solved, stable transmission of prestress in a rod body is guaranteed, prestress loss is reduced fundamentally, and the service life of the rod body is prolonged. The pre-pressing effect of the prestressed steel bars on the pole body is fully exerted, the crack resistance and bending resistance of the conical cement pole are remarkably improved, and the pole body is made to adapt to the complex stress working condition of an outdoor overhead line.