9 results about "Temperature stress" patented technology

The invention discloses the technical field of constructional engineering and intelligent control, and relates to a concrete hydration heat self-adaptive control method and system based on digital twinning. The method comprises the following steps: S1, constructing a concrete finite element model, simulating a hydration heat process, and outputting simulation data of temperature and temperature stress; s2, based on the analog data, optimizing the arrangement scheme of the cooling water pipe and the sensor through a composite convolutional neural network; s3, arranging and collecting real-time temperature and temperature stress data according to the scheme; s4, in combination with simulation and real-time data, predicting temperature change by adopting a BP neural network and a long-short term memory network, and constructing a dynamic prediction model; s5, based on the prediction result and the real-time data, constructing a WebGL digital twinborn platform, visualizing the data and correcting a prediction model; and S6, dynamically adjusting parameters of the cooling water pipe according to a correction result to realize hydration heat self-adaptive control. The invention further provides a system for realizing the method, the concrete temperature and the temperature stress can be accurately controlled, and the engineering structure safety and the quality control efficiency are improved.

The invention relates to the technical field of computer-aided engineering modeling, in particular to a prediction method and system for floor external corner cracks, and the method comprises the steps: collecting real-time temperature change data, concrete shrinkage deformation data, humidity information and sunlight intensity information of a floor external corner area; according to the method, a dynamic coupling model of temperature stress and concrete shrinkage is constructed, the influence coefficient of the temperature on the shrinkage rate and stress redistribution are calculated in real time in combination with a mechanical association algorithm, and the problem that dynamic interaction is not reflected due to independent calculation of the temperature stress and the concrete shrinkage in an existing method is solved; and then environment self-adaptive correction is performed on the model according to the humidity and the sunlight intensity, the sensitivity parameter and the temperature stress transmission attenuation coefficient are adjusted, and the defect that the real-time influence of environment factors is not included in an existing method is overcome.

The invention discloses an aerospace power control electronic device accelerated life test method based on failure physics. The method comprises the following steps: firstly, determining a temperature stress level and a thermal correlation failure mechanism acceleration factor of an accelerated life test; determining initial acceleration test time according to the thermal correlation failure mechanism acceleration factor; in combination with the temperature stress level, sequentially cooperating with other failure mechanisms including an electrical correlation failure mechanism, a vibration correlation failure mechanism and a space radiation correlation failure mechanism to obtain stress levels and acceleration factors under the corresponding failure mechanisms, and on the basis of the initial acceleration test time, performing acceleration test time optimization; and finally, based on the determined acceleration factors and corresponding stress levels under each failure mechanism and the finally optimized acceleration test time, carrying out an acceleration life test. The method provided by the invention can provide a scientific basis for reliability evaluation of the electronic product in an on-orbit environment, and can accurately predict the life index of the product under a multi-stress comprehensive condition.

The present invention discloses a method and system for monitoring and dynamically controlling the hydration heat during large-volume concrete pouring, relating to the field of concrete pouring technology. The method comprises pre-embedding a plurality of dual-mode temperature measuring probes within the concrete to collect real-time dual-mode temperature field data within the concrete and simultaneously collect environmental parameters; pre-processing the acquired dual-mode temperature field data, dynamically assigning weights, and fusing the data; constructing a finite element heat conduction model based on a non-steady-state heat transfer equation and a hydration heat model, and inverting the total hydration heat and temperature difference trends from the measured temperature field data; combining an LSTM neural network model to predict the temperature difference between the concrete core and surface, and the temperature difference between the surface and the environment, within a set period of time in the future; and closed-loop controlling the cooling water flow rate and cooling water temperature based on the predicted temperature difference results. By combining dual-mode sensor temperature measurement with heat inversion, the hydration heat temperature difference within the concrete can be predicted in advance, and the cooling scheme can be controlled in real time to avoid the occurrence of temperature stress cracks.

The present invention provides a method for calculating the temperature stress and deformation of the initial support structure of a vertical shaft in cold regions, comprising the following steps: establishing a calculation model, dividing the surrounding rock into two stable temperature fields, a constant temperature zone and a variable temperature zone, and establishing a three-layer thick-walled cylinder finite ring elastic contact calculation model; solving an analytical solution for the temperature distribution, constructing a differential equation for the heat conduction of the shaft under temperature field conditions, and solving an analytical solution for the temperature distribution of the initial support structure; determining the temperature stress and deformation, based on the obtained analytical solution for the temperature distribution of the initial support structure and the theory of autogenous temperature stress of thick-walled cylinders. Compared with traditional methods, this method can provide a basic theory for cold-proof and thermal insulation design of vertical shafts in cold regions. The resulting "zoning-contact solution" concept solves the problem of determining the temperature value of the initial support structure. Not only is the calculation method consistent with structural reality and simple, but the calculation results are also scientific and reasonable, and have the value of further promotion and application.

The invention discloses a vehicle steering wheel heating method and device, a storage medium and a vehicle, and belongs to the technical field of automobiles. Acquiring physiological parameters of the user measured by a sensor on the steering wheel, wherein the physiological parameters comprise skin conductivity, hand skin temperature, pressure stability and heart rate variability; calculating a hand perspiration tendency grade of the user according to the physiological parameters; determining a heating control strategy corresponding to the hand perspiration tendency level, wherein the level of the hand perspiration tendency level is in negative correlation with the level of a heating rate interval in the heating control strategy; calculating a target heating rate of the steering wheel according to a heating rate interval and the hand skin temperature in the heating control strategy; and heating the steering wheel at the target heating rate. According to the invention, a warm but not hot heating mode can be provided, too fast generation of hand sweat is inhibited, and hysteresis and potential safety hazards caused by first sweating and then intervention are avoided; a heating mode for rapidly warming hands can be provided, and the comfort degree is improved; the energy utilization can be optimized, and the endurance mileage of the vehicle is prolonged.

The invention discloses a large-temperature-difference wide-temperature-range generator operation stability guarantee system, and belongs to the technical field of steam power generation. The environment and state sensing module is electrically connected with the central control unit and used for collecting temperature, pressure, vibration, rotating speed and environment parameters of key parts of the steam turbine generator in real time and predicting the future short-time environment temperature change trend; the intelligent control center module is connected with the environment and state sensing module, and a digital twinborn model and a thermal stress prediction algorithm are built in the intelligent control center module; the system can realize real-time high-precision sensing and prediction of the global thermal state of the generator, actively stabilizes harmful temperature gradient through intelligent cooperation of multiple execution mechanisms, controls thermal stress within a safe range by using a hydrogen inner cooling mode, and improves the safety of the generator. Therefore, the starting speed, the load response capability, the operation stability and the service life of the generator in a severe temperature environment are obviously improved.

The invention relates to the technical field of data processing, in particular to a joint injury early warning system and device based on temperature-pressure sensing, and the system comprises the steps: collecting the temperature and pressure of a joint; calculating a joint injury coefficient based on the temperature and the pressure at the same moment; calculating a temperature base value and a fluctuation value for the temperature values at different moments, and calculating a standardized value according to the temperature base value and the fluctuation value; the damage type is judged according to the correlation between the temperature and the pressure at the same moment; early warning is carried out based on the joint injury coefficient and the standardized value, and suggestions are given based on the injury type. The specific injury identification success rate is higher.

The present application relates to material storage technology field, specifically to a kind of storage bin and its installation method, the storage bin includes bin wall and stress release seat, bin wall is equipped with multiple and multiple bin wall annular arrangement, to enclose storage cavity, stress release seat is arranged between two adjacent bin walls, and stress release seat is equipped with stress release groove on one of bin wall, and the other is equipped with sliding connection part, sliding connection part can be relatively slidably arranged in stress release groove.The present application can enclose storage cavity of storage material by multiple bin wall annular arrangement, when storage bin is subjected to temperature change and generates temperature stress (i.e. thermal expansion and contraction effect), the relative sliding of sliding connection part in stress release groove can release the temperature stress of bin wall, avoid the deformation damage or structural strength weakening of entire storage bin due to excessive temperature stress, improve the anti-deformation capacity and structural strength of storage bin.