Medical centrifuge fault status monitoring and diagnosis Medical centrifuge fault monitoring and diagnosis The medical condition of the fault monitoring and diagnosis running on the centrifuge system, through the equipment vibration, balance, temperature, pressure signal acquisition and other sensitive parts, and through The characteristic parameters extracted by the signal processing method are the basic principles of the medical identification work of the centrifuge: the centrifuge and its parts in medical operation will be issued to determine the characteristics of their respective signals, and the damage, wear and electronic components of each component , Voltage, current, temperature of these signals, and changes based on the characteristics of the specific parameters of the medical diagnosis and centrifuge fault prediction system of the artificial neural network monitoring and diagnosis of the fault. The intelligent fault monitoring and diagnosis system mainly includes two monitoring and diagnosis processes. The course includes two parts of pre-processing and signal feature extraction to quickly and effectively extract information, reflecting the characteristics of equipment failure is the key to fault diagnosis. Time series of a series of data obtained from a specified time, object diagnosis Sampling input to spotting Spatial mapping data, these data include failed, range and location information types are mapped to the input data of the sample space pre-processing by deleting useless information. The original data is first another failure mode, from mapping to the data space sample space in the spatial data Based on the data extracted by invariant features, the same failure mode space is formed, and the failure modes of the same function are extracted. According to the needs and the characteristics of the selected mode feature vector, the problem is diagnosed to quantify the compression conversion and select useful Function for fault diagnosis
2.1 Signal generation and propagation The system structure of the medical centrifuge does not change for a period of time. The vibration of the system can be expressed as:
M [] (ten) C [] (x) K [] (ten) = (Q plays). .
M [] is the mass of the system matrix, (ten) is responding to the acceleration vector, C [] is the damping matrix system, (ten) is the velocity vector, [potassium iodide is the system stiffness matrix, (x) is the vibration displacement vector Q [] for Generate vector rewards for medical centrifuge system noise and vibration forces.
The vibration excitation of the medical centrifuge system is: motor drive system, screen basket and processing errors, bearings and brackets, assembly of unbalanced shafts, the formation of cracks in the body, cracked cavity water, problems caused by excessive temperature failure, serious problems in high centrifugation, The high-speed rotating shaft tilts and vibrates. When the vibration frequency exceeds the limit, it will cause the centrifuge of the entire system to resonate, leading to serious consequences.
2.2 Signal processing is suitable for medical centrifuge fault diagnosis. Acoustic signals are usually measured at a point near the body of the medical centrifuge motor and gearbox. Signal analysis to obtain useful information. Fault diagnosis is usually a machine with mass distribution, stiffness and damping. The model of the system, the phenomenon of noise and vibration, the occurrence of machine movement and fixed wireless related areas (five), i_1, 2, ..., say that these components fail in the case of vibration of the failed mechanical system, and others The phenomenon caused by friction is due to the initial basket of the motor and screen rotation and influence, as well as rotation and other affiliated mechanisms related to forced vibration mechanical movement. Vibration is used as the basic vibration, which is written in C (registered trademark, ton, 0), the research says The location, the time of this move, the time machine has used 0 its strength and the frequency determined by the type of machine. Medical centrifuge components and failure related failures are the original source of vibration, not recorded by Vi (ton, overseas) In the mechanical structure, the basic vibration and structural noise at the time t and the frequency f and there is no response, the money coming at a certain position r The vibration caused by the item, the acceleration sensor A (registered trademark, ton, 0) installation position, its output signal S electronic (registered trademark, ton, 0) In order to obtain three (registered trademark, ton, 0), you can get from the first The location of each measuring point fails, the pulse transfer function h (Li, T, 0), where Li-Dwelling (coordinates are the defined analysis model .. z) is the noise and vibration vector generated by the measuring point
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