22 results about "Temperature spectrum" patented technology

The invention provides an LNG ship pipe fitting fatigue life modeling optimization method and system. The method comprises the steps that a fatigue life simulation model of a low-temperature pipe fitting is established; fatigue state constraint is applied to a fatigue damage structure in the fatigue life simulation model based on the load spectrum and the temperature spectrum at the monitoring node, and a damage constraint condition of the target low-temperature pipe fitting in a vibration state is obtained; determining the thermal fatigue loss of fatigue life simulation under different low-temperature thermal cycle loads according to the thermal fatigue damage and load spectrum characteristics of each connection part under different low-temperature thermal cycle loads; cost optimization is carried out on fatigue life control parameters of the fatigue life simulation model according to the damage constraint conditions and all the thermal fatigue losses, optimal cost parameters for fatigue life simulation under the thermal-vibration load working condition are obtained, and the local grid density of the fatigue life simulation model is adjusted based on the optimal cost parameters. By the adoption of the scheme, parameter cost optimization of the fatigue life simulation model of the LNG ship pipe fitting under the thermal-vibration load working condition can be achieved.

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 invention discloses a method for compiling an acceleration task test load spectrum taking heating and pressurization into consideration, taking a long-term life test spectrum without considering heating and pressurization as basic compilation data, and calculating and analyzing the corresponding turbine front inlet temperature when the engine speed reaches the maximum speed under the conditions of increasing the inlet total temperature and total pressure according to the engine performance model; according to the engine temperature limit condition, the corresponding inlet total temperature and total pressure when the turbine front inlet temperature reaches the temperature limit value are used as the final determined single-stage total temperature spectrum and single-stage total pressure spectrum; then, according to the engine performance model, the speed of the long-term life test spectrum with heating and pressurization is corrected, so that the damage of the long-term life test spectrum taking heating and pressurization into consideration is equivalent to that of the long-term life test spectrum without considering heating and pressurization; then, based on the characteristic load damage acceleration method such as low-cycle fatigue, creep, thermal fatigue, etc., the acceleration task test spectrum is compiled under the premise of damage equivalence, and finally the whole machine test is carried out.

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.

The utility model discloses a dielectric temperature spectrum double-station synchronous measurement control system. Comprising a cabinet, an electric control box arranged at the bottom of the cabinet, a first high-temperature furnace and a second high-temperature furnace which are arranged in the cabinet and oppositely located on the electric control box left and right, and a first clamping jig and a second clamping jig which are arranged in the cabinet and located on the first high-temperature furnace and the second high-temperature furnace respectively. The first high-temperature furnace and the second high-temperature furnace are both provided with a plurality of sample placing stations, a double-station multi-channel control panel is arranged in the electric cabinet, and the double-station multi-channel control panel is provided with a first measuring station interface and a second measuring station interface corresponding to the left and right sides of the first high-temperature furnace and the second high-temperature furnace; the first measuring station interface and the second measuring station interface are respectively provided with a plurality of measuring channel interfaces to correspond to a plurality of sample placing stations of the first high temperature furnace and the second high temperature furnace. The device has the characteristics of high test efficiency, strong anti-electromagnetic interference capability, stable frequency signal test and the like, and is convenient and fast to operate.

The invention discloses a hot end disc life test spectrum compilation method based on an actual measurement spectrum. The method comprises the following specific steps: firstly, carrying out peak valley value identification and small load removal on all rotating speed and temperature spectrums of an engine; secondly, the rotating speed peak value and temperature peak value data and the rotating speed valley value and temperature valley value data are matched, and the correlation between the temperature and the rotating speed in the engine actual measurement spectrum is fitted through a least square method and a one-dimensional linear function; the peak value and the valley value of the rotating speed spectrum and the load holding time of the peak value and the valley value are extracted and counted, and the counted rotating speed extreme value is clustered so as to compile an eight-level life test spectrum. And finally, based on the counted rotating speed spectrum grade, comprehensively considering the correlation between the temperature and the rotating speed in the operation process of the hot end disc, and fully considering the fatigue and creep damage of the hot end disc and the material attribute change caused by the temperature. And a hot end disc multi-parameter life test spectrum containing temperature and rotating speed is compiled.

The invention relates to the technical field of aero-engine load spectrums, and particularly discloses a method for determining an intermediate state holding load rotating speed in an aero-engine acceleration task test run spectrum. The method comprises the following steps: performing filtering processing on an actually measured temperature spectrum and a rotating speed spectrum of an aero-engine comprehensive mission spectrum test, applying the processed temperature spectrum and rotating speed spectrum to a high-pressure turbine disc of an aero-engine key part to compile a stress spectrum and a temperature spectrum of a dangerous point, performing a material high-temperature creep test, and calculating a material failure mode; and dividing the failure mode consistency interval of the variable-temperature variable-load creep load, and finally determining the maximum state holding load rotating speed in the test run spectrum of the acceleration task of the aero-engine. According to the method, the test run spectrum holding load section with the same failure mode can be converted into the holding load section in the large state, the holding load rotating speed in the intermediate state in the aero-engine acceleration task test run spectrum is determined on the premise of guaranteeing the consistency of the failure modes, and the acceleration task test run spectrum can be compiled conveniently.

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.

Disclosed is a method for calculating the temperature of a power semiconductor in a power electronics unit, which is used in particular for controlling an electric machine. The method calculates a power dissipation time history of the power semiconductor, converts this dissipation time history into a power dissipation spectrum in the frequency domain (1), calculates a temperature spectrum based on the power dissipation spectrum and a thermal power semiconductor model that depends on the power semiconductor (2), and converts the temperature spectrum into a temperature time history in the time domain and provides the temperature time history (3). Disclosed is also a computing unit configured and programmed to execute the method, and a system comprising the power electronics unit and the computing unit.

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.

The invention discloses a method for determining the shortest load holding time after rotating speed reduction in an aero-engine acceleration task test run spectrum, and relates to the technical field of aero-engine load spectrums. Comprising the following steps: acquiring an actually measured temperature spectrum and a rotating speed spectrum, performing regularization processing, deleting small circulation and disturbance signals by adopting a rain flow filtering threshold value with a maximum and minimum amplitude difference, and completing spectral band head and tail point supplementation and interpolation; loading the regular spectrum into a finite element thermal simulation model of the high-pressure turbine disc, and constructing a transient thermal simulation system containing convective heat transfer boundary conditions to obtain a turbine disc temperature field response curve; according to the criterion that the temperature change rate is continuously converged to a threshold value, the shortest load holding time needed under the working condition that the rotating speed and the turbine front temperature are synchronously reduced is recognized; and a temperature-stress coupling equivalent life conversion method is adopted to compress spectrum segments which do not meet conditions, and an acceleration task test run spectrum with the shortest load holding time is generated. The method improves the damage equivalence and physical accuracy of spectrum compression, and is suitable for optimization and reconstruction of the aero-engine life test spectrum.