15 results about "Temperature spectrum" patented technology

The present application belongs to the technical field of metal materials, and particularly relates to a method for in-situ measuring MC carbide solid solution and precipitation temperature by internal friction. The present application uses pure iron and pure chromium to prepare Fe-Cr based alloy samples, processes the samples into internal friction samples after solid solution and rolling; in a vacuum environment, the samples are heated to a preset target temperature covering the expected solid solution characteristic temperature range of MC carbide at a constant rate and are kept at the temperature, then are cooled at the same rate, the internal friction value and modulus are continuously measured, and a first and second in-situ internal friction temperature spectrum is drawn; the frequency dispersion characteristics of grain boundary relaxation peak, the internal friction value mutation and the modulus change in the two temperature spectra are compared to determine the solid solution temperature and precipitation temperature of MC carbide. The method has high sensitivity and simple operation, and is suitable for in-situ characterization of grain boundary precipitates in low carbon content Fe-Cr based alloys.

The present disclosure provides a novel thermophysical property value measurement device and a thermophysical property value measurement method which can improve the measurement accuracy of a thermophysical property value by increasing the S / N ratio of a measurement signal when measuring the thermophysical property value by a flash method, while preventing damage to a measurement target member and a change in the thermophysical property due to an unintentional temperature rise. A thermophysical property value measurement device 100 according to the present disclosure comprises: a light emitting unit 20 that irradiates a measurement target member S with pulsed light that periodically flickers; and a calculation unit 62 that calculates the periodic temperature data from the temperature measurement unit 30. A calculation unit 62 generates a periodic temperature spectrum from the periodic temperature data; retrieving a periodic pulse temperature spectrum analytic solution obtained according to a theoretical formula of the temperature change caused by the monopulse light; assuming that the periodic pulse temperature spectrum analytical solution is matched with the periodic temperature spectrum, and calculating each parameter of the periodic pulse temperature spectrum analytical solution; and calculating a thermophysical property value of the measurement target member S on the basis of each calculated parameter.

This invention discloses a method for determining the shortest hold-up time after speed reduction in an aero-engine acceleration mission test spectrum, relating to the field of aero-engine load spectrum technology. The method includes: acquiring and normalizing the measured temperature and speed spectra; using a rainflow filtering threshold based on the maximum and minimum amplitude differences to remove small cycles and disturbance signals, and completing spectral segment completion and interpolation; loading the normalized spectrum into a high-pressure turbine disk finite element thermal simulation model, constructing a transient thermal simulation system including convective heat transfer boundary conditions to obtain the turbine disk temperature field response curve; identifying the shortest hold-up time required under the condition of simultaneous decrease in speed and turbine inlet temperature based on the criterion of continuous convergence of the temperature change rate to a threshold; and compressing spectral segments that do not meet the conditions using a temperature-stress coupled equivalent life conversion method to generate an acceleration mission test spectrum with the shortest hold-up time. This invention improves the damage equivalence and physical accuracy of spectral segment compression and is applicable to the optimization and reconstruction of aero-engine life test spectra.

The application provides an LNG ship pipe fatigue life modeling optimization method and system, and establishes a fatigue life simulation model of low-temperature pipes; fatigue state constraints are applied to fatigue damage structures in the fatigue life simulation model based on load spectrum and temperature spectrum at monitoring nodes, damage constraint conditions of target low-temperature pipes under vibration states are obtained; thermal fatigue losses of fatigue life simulation under different low-temperature thermal cycle loads are determined according to thermal fatigue damage and load spectrum characteristics of each connection position under different low-temperature thermal cycle loads; fatigue life control parameters of the fatigue life simulation model are cost optimized according to the damage constraint conditions and all thermal fatigue losses, optimal cost parameters of fatigue life simulation under thermal-vibration load conditions are obtained, and local grid density of the fatigue life simulation model is adjusted based on the optimal cost parameters. By adopting the scheme of the application, parameter cost optimization of the fatigue life simulation model of the LNG ship pipe under thermal-vibration load conditions can be realized.

The invention provides a light source temperature compensation method and device, an endoscope system and a storage medium, and relates to the technical field of computers. According to the method, the luminous efficiency of each light source at the current junction temperature can be accurately obtained by pre-establishing the temperature spectrum model corresponding to each light source; the sensitivity degrees of human eyes to light source output changes in different light-emitting modes are different, so that actual control signals corresponding to the light sources are determined by combining the light-emitting efficiency of the light sources at the current junction temperature and the light-emitting mode of the cold light source device, the light-emitting brightness of the light sources is further controlled, the light source temperature compensation accuracy can be improved, and the light source temperature compensation effect is improved. And the condition that the hue and the brightness of the image are instantaneously changed in the compensation process can be improved.

A thermophysical property value measurement device and thermophysical property value measurement method, which can enhance measurement accuracy of a thermophysical property value by increasing the S / N ratio of a measurement signal, while preventing a measurement target member from being damaged and a thermophysical property from varying due to unintended temperature rise, in measurement of the thermophysical property value by a flash method. A thermophysical property value measurement device according to the present disclosure includes: a light emitting unit that irradiates a measurement target member S with a pulsed light that periodically flashes; and a computation unit that computes periodic temperature data from a temperature measuring unit. The computation unit generates a periodic temperature spectrum from the periodic temperature data, retrieves a periodic pulse temperature spectrum analytical solution acquired from a theoretical formula of temperature change by a single pulsed light, calculates respective parameters of the periodic pulse temperature spectrum analytical solution, supposing that the periodic pulse temperature spectrum analytical solution matches the periodic temperature spectrum, and calculates a thermophysical property value of the measurement target member S, based on the calculated respective parameters.

This invention belongs to the field of metallic materials technology, specifically a method for in-situ measurement of the solution and precipitation temperatures of MC-type carbides using internal friction. The invention uses pure iron and pure chromium to prepare Fe-Cr based alloy samples, which are then processed into internal friction samples after solution treatment and rolling. Under vacuum, the samples are heated at a constant rate to a preset target temperature covering the expected solid solution characteristic temperature range of MC-type carbides and held at that temperature. Then, they are cooled at the same rate, and the internal friction value and modulus are continuously measured. First and second in-situ internal friction temperature spectra are plotted. By comparing the grain boundary relaxation peak frequency dispersion characteristics, abrupt changes in internal friction value, and modulus changes in the two temperature spectra, the solution and precipitation temperatures of MC-type carbides are determined. This method is highly sensitive, simple to operate, and suitable for in-situ characterization of grain boundary precipitates in low-carbon Fe-Cr based alloys.

The invention provides a method for analyzing thermal stress of a thin-wall reinforced cylindrical structure under a temperature spectrum, and belongs to the technical field of structural thermal stress analys.The method comprises the steps that thermal stress distribution of the thin-wall reinforced cylindrical structure under any temperature load working condition is obtained, recording the inner wall loading temperature, the temperature of the key part and the thermal stress of the key part of the thin-wall reinforced cylindrical structure under the temperature load working condition; a thermal stress expression is constructed according to the linear relation between the thermal stress and the difference between the inner wall loading temperature and the temperature of the key part, and correlation coefficients are obtained through calculation of the thermal stress expression; and obtaining any temperature load spectrum, and estimating the thermal stress of the corresponding key part under any temperature load based on the temperature load spectrum, the thermal stress expression and the correlation coefficient, thereby obtaining the thermal stress spectrum of the key part of the thin-wall reinforced cylindrical structure.

The invention relates to the technical field of load spectrum filtering, and provides a turbine blade film hole thermal stress damage threshold-based aero-engine temperature spectrum filtering method, which comprises the following steps of: extracting temperature amplitude, temperature mean and slope information of an aero-engine temperature spectrum middle section; establishing a thermal damage parameter proxy model of the turbine blade with the air film hole based on the actually measured temperature spectrum; utilizing the life prediction model, introducing a temperature function parameter to represent the influence of the temperature on the material performance, and correcting the stress mean value influence by adopting an average stress method to obtain a thermal damage calculation model for any temperature amplitude and temperature mean value under the load spectrum; determining a temperature and slope combination deletion threshold based on damage calculation; and filtering the temperature spectrum of the aero-engine according to the combination deletion threshold. According to the method, the temperature spectrum of the turbine blade of the aero-engine can be accurately filtered based on the thermal damage, and the small temperature load which contributes little to the damage and occupies experimental resources is filtered out.

This invention provides a new thermophysical property measuring device and method that can improve the accuracy of thermophysical property measurement by increasing the signal-to-noise ratio of the measurement signal, while suppressing damage to the measured material or changes in thermophysical properties due to unintended temperature increases during the measurement of thermophysical properties using the flash method. [Solution] The thermophysical property measuring device 100 according to the present disclosure comprises a light-emitting unit 20 that irradiates a member S to be measured with periodically emitted pulsed light, and a calculation unit 62 that calculates periodic temperature data from a temperature measurement unit 30. The calculation unit 62 generates a periodic temperature spectrum from the periodic temperature data, reads out a periodic pulsed temperature spectrum analysis solution obtained from a theoretical formula for temperature change due to a single pulse of light, calculates each parameter of the periodic pulsed temperature spectrum analysis solution assuming that the periodic pulsed temperature spectrum analysis solution matches the periodic temperature spectrum, and calculates the thermophysical property values ​​of the member S to be measured based on the calculated parameters.

Disclosed is an abnormal temperature detection system in which the amount of temperature information processing for an entire battery cell can be reduced and stability can be improved, the system comprising: a plurality of light guide plates which overlap at least a partial area of one side of a battery cell in one direction, are struck by electromagnetic waves radiated from the battery cell, and change the path of the electromagnetic waves; an image sensor which overlaps at least a partial area of each of the plurality of light guide plates in the one direction, detects the electromagnetic waves reflected from the light guide plates, and outputs temperature spectrum information for the one side of the battery cell on the basis of the detected electromagnetic waves; and a calculation unit which determines that an abnormal temperature has been detected in the battery cell if the temperature of the one side of the battery cell is outside a preset temperature range.

This application provides a water dispenser temperature control method and system based on spectrum feedback, relating to the field of temperature control technology. This application utilizes near-infrared spectral detection to acquire near-infrared spectral data of drinking water within the water dispenser, and uses temperature spectrum detection to acquire water temperature spectrum data of the drinking water within the water dispenser. Spectral feedback analysis is performed on the near-infrared spectral data to determine the heat absorption coefficient of the drinking water corresponding to its water quality type. Based on the drinking water quality type and water temperature spectrum data, drinking water with a pre-uniform temperature is generated after processing with a specific frequency sound wave. The temperature deviation between the actual temperature of the pre-uniform drinking water and the preset target temperature is calculated to generate heating control parameters. Based on the heating control parameters, temperature control of the water dispenser is achieved under different water qualities, realizing the reduction of local temperature differences during the heating process under different water qualities and dynamic optimization of heating parameters, thus improving the accuracy and adaptability of the water dispenser's temperature control.

The invention relates to a method and device for measuring the surface type deviation of a main reflecting surface of a radio astronomical telescope, and the method comprises the steps: obtaining the observation data of the radio telescope after the observation of a target SiO spectral line source in an ON-OFF mode in different focal position states, the observation data comprises signal values at different sampling time points in the ON stage, an azimuth angle, a pitch angle and signal values at different sampling time points in the OFF stage; determining a local temperature spectrum of each signal value fragment of each SiO spectral line in the ON stage in each focal position state based on the observation data in each focal position state, and determining equivalent spectral line intensity of each signal value fragment of the ON stage in each focal position state, so as to determine actually measured far field power distribution in each focal position state; and finally, determining the surface type deviation of the main reflecting surface of the radio telescope based on the actually measured far-field power distribution in each focal position state.

The present application relates to a kind of face shape deviation measurement method and device of main reflecting surface of radio astronomy telescope, method includes: obtaining the observation data of radio telescope in different focal position state after being observed to target SiO spectral line source in ON-Off mode, and observation data includes the signal value of different sampling time points in ON stage, azimuth and elevation and the signal value of different sampling time points in OFF stage;Determine the local temperature spectrum of each signal value segment in ON stage of each SiO spectrum in each focal position state based on the observation data in each focal position state, and determine the equivalent spectral line intensity of each signal value segment in ON stage of each focal position state, to determine the measured far field power distribution in each focal position state, finally determine the face shape deviation of main reflecting surface of radio telescope based on the measured far field power distribution in each focal position state.

This invention discloses a method for compiling a life test spectrum for turbine guide vanes based on measured temperature spectra, relating to the field of load spectrum compilation technology for aero-engine components. The method includes preprocessing and small load removal to process the temperature spectrum of a typical flight profile and extract all temperature cycles, including temperature mean, temperature amplitude, and slope. The temperature amplitude, temperature mean, and slope are clustered to divide the temperature cycles into multiple levels of equivalent loads. The frequency of each level of equivalent load is determined based on the single damage of the equivalent load and the total damage of all points within the corresponding cluster. The loading order of the equivalent loads is determined by the temporal location distribution of all points within the cluster within the temperature spectrum, and the influence of the order between interactive loads is resolved through back-interpolation rules. This invention simultaneously considers the temporal location distribution of loads and the influence of interactive loads, reflecting the actual load magnitude, true sequence effect, and load distribution characteristics.