摘要:
A module for monitoring industrial processes for use in a system for monitoring industrial processes that comprises sensor means (7; 17) for detecting process quantities in a process station (20), acquisition means (8, 32; 32′; 32″) for acquiring measurement signals (R) issued by said sensor means (7; 17), processing means (9; 19) operating on signals (T; T1) generated by said acquisition means (8, 32; 32′; 32″) to obtain information on the quality of the process, and means for managing the production flow (9; 19), which operate on the basis of said information on the quality of the process and are located in a workstation (50) that is remote with respect to said process station, said monitoring module (30) being configured for being set locally at said at least one process station (20) for receiving measurement signals (R) issued by said sensor means (7; 17). Said monitoring module (30), set locally at said process station (20) comprises means (32″) for acquisition and processing of the measurement signals (R), which in turn comprise means (33) for encoding said measurement signals (R) generated by said sensor means (17) into encoded signals, and wireless transmission means (42) associated to said acquisition means (32″) configured for sending the encoded signals (T; T1) generated by said acquisition means (32″) to corresponding wireless receiver means (82; 43) comprised in said remote workstation (50) that comprises said means for managing the production flow (19) and said processing means (9), which operate on signals (T; T1) generated by said acquisition means (32″) to obtain information on the quality of the process, said acquisition means (32″) comprising a voltage-to-frequency converter (72) for converting said measurement signals (R) into a pulse train (T1) at a variable frequency greater than or equal to 65 536 Hz.
摘要:
A system and a method for controlling the quality of an industrial process, of the type that comprises the steps of: providing one or more reference signals for the industrial process; acquiring one or more real signals that are indicative of the quality of said industrial process; and comparing said one or more reference signals with said one or more real signals in order to identify defects in said industrial process. According to the invention, the method moreover comprises the operations of: obtaining a transformed signal from said reference signal; obtaining a transformed signal from said real signal; and calculating energies of said transformed reference signal and said real signal, respectively, said comparison operation comprising; comparing with one another said energies of said transformed reference signal and said transformed real signal, respectively, in order to extract corresponding time-frequency distribution for selected frequency values; calculating energies of said time-frequency distributions; and comparing the energies of said time-frequency distributions with threshold values in order to identify energy values associated to defects.
摘要:
An active transponder for synthetic aperture radar systems includes a receiving antenna for receiving a first radiofrequency signal modulated according to a first train of one or more first pulses, separating means comprising two outputs outputting the first radiofrequency signal, second processing means connected to a first output of the separating means to generate a code synchronized with the first pulses, signal generating means connected to the second output and to the second processing means generate a second radiofrequency signal modulated by the code, and a transmitting antenna means to transmit the second radiofrequency signal to generate, for each one of the first pulses, a sequence of one or more second pulses, the code being synchronized with the second pulses.
摘要:
The invention concerns an active transponder, particularly for synthetic aperture radar systems, or SAR, comprising: a receiving antenna (20) for receiving a first radiofrequency signal modulated according to a first train of one or more first pulses; separating means (3), comprising two outputs at each one of which it outputs the first radiofrequency signal; second processing means (7, 8, 9, 10, 11, 12), connected to a first output of the separating means (3), capable to generate at least one code synchronised with the first pulses; signal generating means (4), connected to a second output of the separating means (3) and to the second processing means (7, 8, 9, 10, 11, 12), capable to generate a second radiofrequency signal modulated by said at least one code generated by the second processing means (7, 8, 9, 10, 11, 12); and a transmitting antenna means (30), capable to transmit the second radiofrequency signal; characterised in that the second processing means (7, 8, 9, 10, 11, 12) is capable to generate, for each one of the first pulses, a sequence of one or more second pulses, said at least one code being synchronised with the second pulses.
摘要:
A control circuit is for an electric power plant including an asynchronous generator of an AC voltage, a motor to rotate a rotor of the asynchronous generator as a function of a first control signal of a developed motor torque, and a bank of capacitors coupled to the asynchronous generator and having a total capacitance varying as function of a second control signal. The control circuit may include a monitor circuit to monitor at least one parameter of the AC voltage, and a control signal generator circuit cooperating with the monitor circuit to generate the first and second control signals by soft-computing techniques both as a function of the frequency and of a representative value of an amplitude of the AC voltage to make the AC voltage have a desired amplitude and frequency.
摘要:
A method for controlling the quality of industrial processes, of the type comprising the steps of: making available one or more relating to the industrial process acquiring one or more real signals, indicative of the quality of said industrial process, comparing said one or more reference signal to said one or more real signals to identify defects in said industrial process. According to the invention the method further comprises the operations of: obtaining a transformed signal from said reference signal; obtaining a transformed signal from said real signal; calculating energies of said transformed signals, respectively reference and real, said comparing operation comprising: comparing said energies of said transformed signals respectively reference and real to extract corresponding time frequency distributions for selected frequency values; calculating energies of said time frequency distributions; comparing the energies of said time frequency distributions with threshold values to identify energy values associated to defects.
摘要:
A module for monitoring industrial processes for use in a system for monitoring industrial processes that comprises sensor means (7; 17) for detecting process quantities in a process station (20), acquisition means (8, 32; 32′; 32″) for acquiring measurement signals (R) issued by said sensor means (7; 17), processing means (9; 19) operating on signals (T; T1) generated by said acquisition means (8, 32; 32′; 32″) to obtain information on the quality of the process, and means for managing the production flow (9; 19), which operate on the basis of said information on the quality of the process and are located in a workstation (50) that is remote with respect to said process station, said monitoring module (30) being configured for being set locally at said at least one process station (20) for receiving measurement signals (R) issued by said sensor means (7; 17). Said monitoring module (30), set locally at said process station (20) comprises means (32″) for acquisition and processing of the measurement signals (R), which in turn comprise means (33) for encoding said measurement signals (R) generated by said sensor means (17) into encoded signals, and wireless transmission means (42) associated to said acquisition means (32″) configured for sending the encoded signals (T; T1) generated by said acquisition means (32″) to corresponding wireless receiver means (82; 43) comprised in said remote workstation (50) that comprises said means for managing the production flow (19) and said processing means (9), which operate on signals (T; T1) generated by said acquisition means (32″) to obtain information on the quality of the process, said acquisition means (32″) comprising a voltage- to- frequency converter (72) for converting said measurement signals (R) into a pulse train (T1) at a variable frequency greater than or equal to 65 536 Hz.
摘要:
A control circuit controls an electric motor and includes: a measuring device configured to measure a first phase current of the motor and provide a corresponding first analog signal; an analog-to-digital converter structured to convert the first analog signal into a first digital signal; a conversion module for generating a first converted digital signal representative of the first digital signal expressed in a rotating reference system; a node structured to compare the first converted digital signal into a first reference signal and generate a first error signal; and a measure control circuit structured to provide a timing signal of the analog-to-digital converter depending on the first error signal and a time delay introduced by the measuring device.
摘要:
A method for estimating values assumed at a certain instant of each period by currents flowing respectively in two distinct windings of a poly-phase load controlled in a space vector modulation (SVM) mode, using a same measuring device, may include coupling the measuring device to the first winding and measuring a current flowing therethrough with an anticipation from the certain instant smaller than or equal to an SVM half-period. The method may also include coupling the measuring device to the second winding, measuring a current flowing therethrough at the certain instant, coupling the measuring device to the first winding, and measuring a current flowing therethrough with a delay equal to the anticipation. The method may also include estimating a value assumed at the certain instant by the current flowing through the first winding based upon the two measured values with the anticipation and with the delay respectively.
摘要:
A system and a method for controlling the quality of an industrial process, of the type that comprises the steps of: providing one or more reference signals for the industrial process; acquiring one or more real signals that are indicative of the quality of said industrial process; and comparing said one or more reference signals with said one or more real signals in order to identify defects in said industrial process. According to the invention, the method moreover comprises the operations of: obtaining a transformed signal from said reference signal; obtaining a transformed signal from said real signal; and calculating energies of said transformed reference signal and said real signal, respectively, said comparison operation comprising; comparing with one another said energies of said transformed reference signal and said transformed real signal, respectively, in order to extract corresponding time-frequency distribution for selected frequency values; calculating energies of said time-frequency distributions; and comparing the energies of said time-frequency distributions with threshold values in order to identify energy values associated to defects.