Abstract: A method for detecting abnormal vibration of a rolling mill including a collecting step of collecting vibration data of the rolling mill, a frequency analysis step of generating first analysis data by performing frequency analysis of the vibration data, a principal component analysis step of performing principal component analysis on the first analysis data by using reference data specified in advance on the basis of a normal state as a principal component and thereby generating evaluation data, which is a projection of the first analysis data onto the reference data, and an abnormal vibration detection step of extracting an outlier component from the evaluation data and the first analysis data and detecting an abnormality of the rolling mill from the extracted outlier component.

Abstract: A method for detecting abnormal vibration of a rolling mill including a collecting step of collecting vibration data of the rolling mill, a frequency analysis step of generating first analysis data indicative of vibration intensities at respective frequencies by performing frequency analysis of the vibration data, a data conversion step of converting the first analysis data into second analysis data indicative of vibration intensities at respective intervals on the basis of a rolling speed, and a map generation step of generating a vibration map in which a plurality of the second analysis data are arranged in time series.

Abstract: A method for determining the conformity of a rolling roll and the like is disclosed. The method includes: a rolling load data acquisition step of acquiring rolling load operation data of a stand having a roll to be evaluated; a circumferential speed data acquisition step of acquiring circumferential speed operation data of the roll to be evaluated; a vibration analysis step of analyzing the vibration behavior of the stand using the rolling load operation data of the stand; a surface shape estimation step of estimating the surface shape of the roll to be evaluated from the analysis result of the vibration behavior of the stand and the circumferential speed operation data of the roll to be evaluated during the rolling of a metal strip; and a conformity determination step of determining the conformity of the roll to be evaluated based on the surface shape of the roll to be evaluated.

Abstract: A galvanized steel sheet is disclosed. The galvanized steel sheet has an arithmetic average roughness Ra of a surface of the steel sheet of 0.5 ?m to 2.5 ?m, and has concave and convex portions on the surface thereof, in which there are flattened portions in the convex portions, in which the number of valleys between the convex portions having a valley width of 0.1 mm or more and a maximum depth of 2.0 ?m or more is 50 or more and less than 100 per 25 mm on a straight line, and in which, in the flattened portions in the convex portions, the number of concave and convex portions having a height difference of 0.3 ?m or more is less than 20 per 2.5 mm on a straight line.

Abstract: A metal-strip warped-shape prediction method for predicting an exit-side warped shape, which is a warped shape of a metal strip downstream of a temper rolling mill in a metal-strip continuous annealing facility, the metal-strip continuous annealing facility including: heating equipment that heats the metal strip, cooling equipment that cools the metal strip heated by the heating equipment, the temper rolling mill that corrects a shape of the metal strip cooled by the cooling equipment, and an entry-side warped-shape measurement device that measures an entry-side warped shape, which is a warped shape of the metal strip upstream of the temper rolling mill between the cooling equipment and the temper rolling mill, the metal-strip warped-shape prediction method including: predicting the exit-side warped shape based on the entry-side warped shape and at least one of operating parameters of the temper rolling mill.

Abstract: A metal-strip warped-shape control method for controlling an exit-side warped shape, which is a warped shape of a metal strip downstream of a temper rolling mill in a metal-strip manufacturing facility, the metal-strip manufacturing facility including the temper rolling mill that corrects a shape of the metal strip continuously conveyed, and a warped-shape measurement device that measures a warped shape of the metal strip, the metal-strip warped-shape control method including: calculating an approximation curve for the warped shape of the metal strip using an approximation method selected from parabolic approximation, circular arc approximation, and envelope approximation; and setting operating parameters of the temper rolling mill that can reduce a warp height of the exit-side warped shape based on the approximation curve that is calculated.

Abstract: An abnormal-vibration-predicting method for a roll grinder that grinds an outer peripheral surface of a rolling roll with a grinding wheel while the rolling roll rotates includes an acquisition step and a prediction step. The acquisition step acquires a rigidity parameter related to a rigidity of the roll grinder and a wheel rotation parameter related to a rotational speed of the grinding wheel. The prediction step predicts an occurrence of an abnormal vibration in a process of grinding the rolling roll by using the rigidity parameter and the wheel rotation parameter.

Abstract: A galvanized steel sheet is disclosed. The galvanized steel sheet has an arithmetic average roughness Ra of a surface of the steel sheet of 0.5 ?m to 2.5 ?m, and has concave and convex portions on the surface thereof, in which there are flattened portions in the convex portions, in which the number of valleys between the convex portions having a valley width of 0.1 mm or more and a maximum depth of 2.0 ?m or more is 50 or more and less than 100 per 25 mm on a straight line, and in which, in the flattened portions in the convex portions, the number of concave and convex portions having a height difference of 0.3 ?m or more is less than 20 per 2.5 mm on a straight line.

Abstract: A method for detecting abnormal vibration of a rolling mill including a collecting step of collecting vibration data of the rolling mill, a frequency analysis step of generating first analysis data by performing frequency analysis of the vibration data, a principal component analysis step of performing principal component analysis on the first analysis data by using reference data specified in advance on the basis of a normal state as a principal component and thereby generating evaluation data, which is a projection of the first analysis data onto the reference data, and an abnormal vibration detection step of extracting an outlier component from the evaluation data and the first analysis data and detecting an abnormality of the rolling mill from the extracted outlier component.

Abstract: An air conditioning control device includes: an operation pattern acquiring unit to acquire operation patterns indicating an operation target air conditioner in a room; a temperature data acquiring unit to acquire temperature data indicating a temperature measured by a temperature sensor when the air conditioner is in operation: a prediction model generating unit to generate, using a control amount of the air conditioner and temperature data acquired when the air conditioner is in operation as training data, a room-temperature prediction model for predicting the temperature measured by the temperature sensor when the air conditioner are in operation; and an operation pattern selecting unit to provide the control amount of the air conditioner to the room-temperature prediction model to acquire a prediction temperature from each of the room-temperature prediction models, and selects one operation pattern from the operation patterns on the basis of the prediction temperature.

Abstract: A method for detecting abnormal vibration of a rolling mill including a collecting step of collecting vibration data of the rolling mill, a frequency analysis step of generating first analysis data indicative of vibration intensities at respective frequencies by performing frequency analysis of the vibration data, a data conversion step of converting the first analysis data into second analysis data indicative of vibration intensities at respective intervals on the basis of a rolling speed, and a map generation step of generating a vibration map in which a plurality of the second analysis data are arranged in time series.