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Bearing vibrations of a power plant blower have random characteristics with stark noise, which make it difficult for fault feature extraction both by using vibration effective data of monitoring system and vibration analysis function of a portable measuring instrument. Made use of the vibration signals which were measured from a normal blower and a fault one, the vibration characteristics of fault...
In order to get an electro-hydraulic vibrator with high frequency, great exciting force and large flow, a new type of rotary valve with four-way commutation was designed. The rotary valve is worked under special environment, so the characteristic of the valve must be studied. Based on the structure and working principle of this valve, the mathematical expressions of steady-state axial flow force and...
Wood vinegar is a product of agriculture and forestry residues pyrolysis with insecticidal, antibacterial effect, and is even found to have health care. In recent years, wood vinegar is being taken seriously more and more by people. Cotton stalk wood vinegar is derived from cotton stalk pyrolysis. It is the gases generated from the pyrolysis of cottons talk, changing into liquid products through condensation,...
The combined wavelet packet and fuzzy pattern recognition method was used to diagnose the gear faults. Firstly, we use wavelet packet db3 (Daubechies3) by level 4 to decompose and analyze the measured vibration signals from a test gearbox. Secondly, the energy of wavelet packet coefficients was calculated as the characteristic values, by means of which the target fuzzy samples and testing fuzzy samples...
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