The Low-frequency Compensation of the Vibration Sensor’s Amplitude-frequency Characteristics
نویسنده
چکیده
The hydropower generating units’ vibration parameter is an important indicator to monitor its rollstabilization. To measure the low-frequency vibration of the large and middle scale of hydropower generating units, according to frequency characteristic compensation principle of the vibration sensor, a low-frequency compensating circuit was designed to extend the frequency characteristic to the low frequency region. The mathematical model of the magnetoelectric dromometer vibration sensor and the design of the compensation circuit were detailed. The amplitude-frequency characteristics of the sensor and its mathematical model were comparatively analyzed before and after compensation respectively. The experimental result shows that the design could extend the amplitude-frequency characteristics to the low frequency region, and have good sensitivity and linearity. Copyright © 2014 IFSA Publishing, S. L.
منابع مشابه
پایش لرزشهای بسامد بزرگ در اتاقهای آزمون موتور به کمک لرزهگیرهای بادی نیمه فعّال با پایشگر PID
Today there are different vibration isolators used in industries according to the weight and excitation frequency of the machines which have vibration. One of them is Air Spring which is in two types: Convoluted air spring and membrane air spring. Convoluted air springs are used to control vibrations in low frequency (usually lower than 10 Hz) and the membrane ones are used in high frequenc...
متن کاملMiniaturization of Inertial Magnetoelectric Vibration Velocity Sensor with High Frequency Response at Low Frequency Band
The frequency response of the inertial magnetoelectric vibration velocity sensor is limited in the low frequency range due to the character of second order high pass filter of the structure. For better performance in the low frequency range, the traditional method is to increase the initial mass of the sensor which will increase the size and weight tremendously. This paper presents a frequency-...
متن کاملNonlocal DQM for Large Amplitude Vibration of Annular Boron Nitride Sheets on Nonlinear Elastic Medium
One of the most promising materials in nanotechnology such as sensors, actuators and resonators is annular Boron Nitride sheets (ABNSs) due to excelled electro-thermo-mechanical properties. In this study, however, differential quadrature method (DQM) and nonlocal piezoelasticity theory are used to investigate the nonlinear vibration response of embedded single-layered annular Boron Nitride shee...
متن کاملNonlinear free vibration of viscoelastic nanoplates based on modified couple stress theory
In this paper, a new viscoelastic size-depended model developed based on a modified couple stress theory and the for nonlinear viscoelastic material in order to vibration analysis of a viscoelastic nanoplate. The material of the nanoplate is assumed to obey the Leaderman nonlinear constitutive relation and the von Kármán plate theory is employed to model the system. The viscous parts of the clas...
متن کاملA Note on Free Vibration of a Double-beam System with Nonlinear Elastic Inner Layer
In this note, small amplitude free vibration of a double-beam system in presence of inner layer nonlinearity is investigated. The nonlinearity is due to inner layer material and is not related to large amplitude vibration. At first, frequencies of a double-beam system with linear inner layer are studied and categorized as synchronous and asynchronous frequencies. It is revealed that the inner l...
متن کامل