10 results about "Reference stress" patented technology

The invention provides an intelligent detection method and system for absolute stress of a steering axle of a port machine, and relates to the technical field of stress measurement and detection. Carrying out synchronous correction and feature modeling on the collected data, and constructing an absolute stress calculation and intelligent analysis model; screening a structure benchmark operation interval based on the operation data, constructing a benchmark stress reference state, and evaluating the stability of the structure benchmark; on the basis, multi-axis decomposition is carried out on the absolute stress, a multi-axis stress decoupling coefficient is calculated, and multi-axis stress safety judgment and coordinated regulation are achieved; and further combining the stress time sequence evolution characteristics and the fatigue accumulation effect, evaluating the long-term stress evolution risk of the structure, and implementing steering, loading and maintenance strategies when the risk exceeds the limit. According to the method, online sensing, risk early warning and closed-loop optimization of the absolute stress of the steering axle are realized, and the operation safety and the structural reliability of the port machinery are improved.

The application relates to the technical field of building information model construction, in particular to a parameterized modeling method of a fabricated shear wall BIM structure. The method obtains actual spatial positions, actual stresses, bottom areas, reference spatial positions and reference stresses of the fabricated shear wall; according to the included angle between each fabricated shear wall and its adjacent fabricated shear wall in each construction layer, the difference between the actual stresses and the reference stresses of the adjacent fabricated shear wall, the difference between the actual spatial positions and the reference spatial positions of the adjacent fabricated shear wall and the bottom area of the fabricated shear wall, the layer internal error degree of the construction layer is obtained; according to the layer internal error degree of each construction layer and the difference between the layer internal error degree of the lower construction layer and the layer internal error degree of the lowest construction layer, the comprehensive error degree of the construction layer is obtained to mark the high-risk construction layer. The application accurately marks the high-risk construction layer, realizes accurate identification and visualization of construction errors, and is beneficial to timely management and control of the construction errors.

The invention relates to the technical field of building information model construction, in particular to a parametric modeling method for a fabricated shear wall BIM structure. The method comprises the steps that the actual space position, the actual stress, the bottom area, the reference space position and the reference stress of the fabricated shear wall are obtained; according to the included angle between each assembly type shear wall and the adjacent assembly type shear wall in each construction layer, the difference between the actual stress and the reference stress of the adjacent assembly type shear wall, the difference between the actual spatial position and the reference spatial position of the adjacent assembly type shear wall and the bottom area of the adjacent assembly type shear wall, the intra-layer error degree of the construction layer is obtained; according to the in-layer error degree of each construction layer, the in-layer error degree difference between the construction layer and the lower construction layer and the in-layer error degree difference between the construction layer and the lowest construction layer, the comprehensive error degree of the construction layers is obtained to mark the high-risk construction layer. By accurately marking the high-risk construction layer, accurate recognition and visualization of the construction error are realized, and timely management and control of the construction error are facilitated.

The invention provides an amphibious aircraft airborne equipment vibration test profile construction method. The method comprises the following steps: S1, dividing flight stages and regions of the amphibious aircraft; s2, collecting actually measured vibration data of the airplane; s3, actually measured vibration data are analyzed, processed and concluded; and S4, constructing a reliability vibration test profile based on actually measured vibration data. The problem that the reliability vibration test profile constructed based on the reference stress is not reasonable and effective enough is solved.

The invention relates to the technical field of motor tools, in particular to a motor controller copper bar welding assembly clearance adjusting method and device, a vehicle and a storage medium, and the method comprises the steps that a motor controller part finite element simulation model is established, the relative position of the model is adjusted according to the copper bar position tolerance, and the limit working condition in a tolerance zone is simulated; under the working condition, applying a displacement load to a tool pressure head, simulating pressing of a part, and obtaining copper bar welding area gap and part stress data; determining a tool pressure head displacement range meeting a preset welding process requirement according to the welding area gap, determining reference stress data according to the tool pressure head displacement range, and adjusting the welding area gap according to the reference stress data and the part stress data so as to adjust the copper bar assembly gap. Therefore, the problems of long copper bar welding period, insufficient theoretical and actual connection, incapability of effectively identifying the failure mode of the plastic structure and the like are solved.

The application provides a kind of port machinery steering bridge absolute stress intelligent detection method and system, it is related to stress measurement and detection technical field, the application is by collecting strain, temperature, steering behavior and load and other multi-source data;The collected data are corrected and characteristic modeling simultaneously, construct absolute stress calculation and intelligent analysis model;Based on operation data screening structure reference operation interval and construct reference stress state, evaluate structure reference stability;On this basis, the absolute stress is decomposed into multiple axes, calculate multi-axis stress decoupling coefficient, realize multi-axis stress safety determination and collaborative control;Further combine stress time evolution characteristics and fatigue accumulation effect, evaluate structure long-term stress evolution risk, and implement steering, load and maintenance strategy when risk is over limit.The application realizes the online perception of steering bridge absolute stress, risk early warning and closed-loop optimization, improves the operation safety and structure reliability of port machinery.

The present application provides a kind of petrochemical equipment creep service safety evaluation method and system, it is related to the creep service safety evaluation technical field of petrochemical equipment, first according to the load fluctuation amplitude of component, material performance index and service defect type, set the limit condition of each level evaluation, by judging whether component meets corresponding condition, into corresponding evaluation process, define evaluation calculation pressure, service time and evaluation temperature in the evaluation process, and calculate three-way principal stress based on evaluation calculation pressure, and screen the screening curve and damage curve of corresponding material, calculate total creep damage, 1st level evaluation is determined by comparing total creep damage with threshold value, 2nd level and 3rd level evaluation need to be judged whether there is plastic collapse risk by primary reference stress and plastic collapse determination criterion first, then determine the result by combining total creep damage with allowable value comparison, 3rd level evaluation uses finite element calculation and directly determines that crack type defect does not pass.

The invention relates to the technical field of bearing design and mechanical transmission, in particular to a hub bearing system bearing optimization design method and system. The method comprises the steps of parameter acquisition, model construction, distortion correction, residual error comparison and iterative optimization. The system constructs a Hertz contact reference model to determine a reference stress field by acquiring geometric and multi-working-condition load parameters; the core of the method is that a ferrule structure flexibility matrix and a contact offset angle model are introduced to correct distortion so as to extract theoretical residual error distribution, and the theoretical residual error distribution is compared with actual residual error distribution to determine a shape correction compensation evaluation index; when the indexes do not meet the threshold value, the system iteratively adjusts the microscopic modification parameters; according to the method, macrostructure interference is effectively stripped, the problem that the influence of multiple factors on contact stress distribution is difficult to distinguish is solved, and a clear physical reference is provided for shape modification.

The invention discloses a hydraulic engineering seepage failure risk identification method based on mechanical sensor measurement, and relates to the technical field of hydraulic engineering. Obtaining a second pressure of water borne by the sampling block, and calculating to obtain a reference stress in the sampling block; establishing a stress prediction function of the sampling block; the actual water pressure of water borne by the sampling block is obtained, and the real-time stress in the sampling block is obtained through calculation; estimating reference stress in the sampling blocks, and taking the sampling blocks of which the difference between the real-time stress and the reference stress exceeds a floating error as characteristic sampling blocks; and identifying to obtain an abnormal sampling block with a seepage failure risk. The three-dimensional structure is divided into at least one sampling block, the stress prediction function of the sampling block is established, the reference stress in the sampling block is obtained, and the abnormal sampling block with the seepage failure risk is identified, so that the position with seepage can be timely and accurately found without submerging underwater, and the identification efficiency is greatly improved.

The present application belongs to the technical field of concrete structure stress monitoring, and discloses a steel pipe concrete structure lateral pressure device and a lateral loading instability judgment method. The cloud data control center uses the ICP algorithm to register the real-time point cloud with the pre-stored initial three-dimensional model to realize deformation quantitative analysis and surface defect evaluation, and outputs a strain anomaly index; a real-time demodulation light signal generates a stress distribution matrix, which is uploaded to the cloud data control center, and a difference operation is performed between the stress distribution matrix and a preset reference stress field matrix to generate a stress offset matrix, and an abnormality judgment threshold is dynamically corrected; the strain anomaly index and the stress offset matrix are coupled to construct an abnormality probability model, and the three-dimensional coordinates of the abnormal area are output to complete the abnormal positioning of the local buckling instability of the structure. The present application can effectively prevent the local instability damage of the steel pipe concrete structure.