The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Based on the analysis of the spectrum and phase plane trajectory of abnormal vibration signals of the CSP rolling mill, this paper studies the phase space reconstruction of the time series signals of abnormal vibration of the rolling mill and relevant technologies, and calculates the maximal Lyapunov exponent of abnormal vibration signals under various sheet rolling conditions. Results show that the...
This paper proposes a novel fault diagnosis method for planetary gearbox based on ensemble empirical mode decomposition (EEMD) and fractal theory. EEMD is applied to process the non-stationary vibration signals and get the feature space. The vibration signal is decomposed by EEMD into different frequency bands effectively. The fractal dimension (FD) can extract fault characters from input signal,...
Mechanical seals are used to prevent leakage of hydraulic fluid in the seal cavity, and in the meantime prevent entry of external contaminants. It is widely used in hydraulic pumps, hydraulic motors and other rotating hydraulic devices. And therefore there are many different designs for mechanical seals to meet specific applications. Due to its superior performance, mechanical seals have been widely...
Wind power does not pollute and is recyclable. The speed of the blades of a wind turbine speeds considerably affect the measured output power of the turbine. The speed of the tip of the blade must be set to maximize power output. The speed of the blade also significantly affects energy losses and the power coefficients. The former should be minimized and the latter maximized. Various loads on a turbine...
The total installed capacity of wind turbines is continuously increasing with focus on Renewable Energy Sources (RES). The reliability and efficiency of wind turbines has become a major issue. The occurrence of fault in various components of wind turbine needs to be addressed for improved performance. Among these issues, wind turbine bearing fault is the most significant. Different techniques such...
Signal filtering approaches are always used to attenuate noise and enhance useful signal in bearing fault diagnosis. Stochastic resonance (SR) is a nonlinear filter that can utilize noise to enhance weak periodic signal. This study proposes an adaptive SR method which can automatically enhance the bearing fault characteristic frequency (FCF). First, a second-order SR filter is utilized to purify the...
This paper presents a novel drive strategy for the drive mode of a micro-gyroscope using second-harmonic excitation, which drives the resonator with a pair of orthogonal signals at half the resonant frequency and senses the vibration signal at the full resonant frequency, thus realizing the frequency isolation between the actual mechanical response and electrical crosstalk signal. This approach is...
In order to study the effect of removing the filter capacitor in the rectifier circuit on the steady-state performances of the permanent magnet direct current motor, simulation analysis and experimental research were accomplished according to a rated voltage 300V DC, 180W, 2-poles permanent magnet direct current motor. The motor was fed by three different methods. The first method is to use standard...
The main purpose of this paper is to analyze the vibration response of space flexible manipulator when suffering the impact impulse at its end-effector. Firstly, the manipulator flexibility is described by assumed mode method, and on this basis, the kinematics equation is established. Secondly, the free vibration equation of the beam is established by using the cantilever beam model to simulate the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.