5 results about "Temperature stress" patented technology

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 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 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.