METHOD FOR DETERMINING RADIATION MEASURES FOR HEAT RADIATION, ELECTRIC ARC FURNACE, DEVICE FOR PROCESSING SIGNALS, AND ALSO SOFTWARE CODE AND INFORMATION CARRIER FOR PERFORMING THE METHOD

摘要

1. A method of determining the measure (SM) radiation for the outgoing from the burning between the electrode (3a, 3b, 3c) and the melted material of the electric arc, falling on the limitation (2) of the electric arc furnace (1) thermal radiation, while measuring (step 30) supplied to the electrode (3a, 3b, 3c), the electrode current is measured (step 30) fluctuations in the structure-borne noise of the electric arc furnace (1), while the measured electrode current is used to determine (step 41) a current estimation signal related to the frequency range of the measured electrode current, wherein from the measured vibrations of the structure-borne noise, a vibration estimation signal is determined (step 41) related to the frequency range of the measured vibrations of the structure-borne noise, and the quotient of the vibration estimation signal and the current estimation signal is formed as a measure (SM) (step 42) measure, for one common for the measured electrode current and measured oscillations of the structure-borne noise frequency. ! 2. The method according to claim 1, characterized in that, as a measure (SM) of the radiation, the sum of the quotients formed for several common frequencies (3f0, 4f0, 5f0, 6f0) is formed (step 43). ! 3. The method according to claim 2, characterized in that at least one of several common frequencies (3f0, 4f0, 5f0, 6f0) is selected from the group consisting of several times exceeding the double working frequency (f0) of the electrode ( 3a, 3b, 3c) frequencies. ! 4. Method according to any one of claims 1 to 3, characterized in that the frequency-dependent current estimation signal is based on! In (ω) b ∫aI (t) ne-iωtdt or on! In (ω) b∫a | I (t) | ne-iωtdt,! where n is a parameter, n 1, 2, 3,…,! i - imaginary unit,! e - Euler's number,! t - time,! ω is the circular frequency of the electrode current,! I (t) is the time-dependent measured electrode current,! I (ω) - frequency dependent �