Based on compared experiment study of 2 spatial steel frame concrete short columns and 1 reinforced concrete short column subjected to axial load,as well as that of 4 spatial steel frame concrete short columns subjected to eccentric load,the failure characteristics of space steel frame concrete short column are analyzed,at the same time,its design and calculation method and configuration are also proposed.
Considering the low signal-to-noise,faint failure characteristics of hydraulic pump,and slow convergence speed and the instability of BP network,a new fault diagnosis method based on the wavelet package analysis and Elman neural network is presented.
Let the chaos fractal be introduced into the failure analysis on vibration signal of transmission shaft, and using interrelated number of dimension to depict the failure characteristics of vibrational signal.
Directing to the dispersiveness and faintness of failure characteristics of hydraulic pump, this paper adopted wavelet analysis to cancel the interference existing in the measured signals and pick up the fault characteristics. Through decomposition and reconfiguration the measured signals with wavelet, it is easy to eliminate the noise and to strengthen the failure signals effectively.
Directing to the dispersiveness and faintness of failure characteristics of hydraulic pump, this paper presented the fault diagnosis method based on data fussion through measuring the vibration signals and pressure signals.
The appearance and major failure characteristics of the surface oxide film of high speed steel(HSS) cast rolls in hot strip mill are investigated,and effect of the oxide film failure on roughness and abrasion state of the roll surface is analyzed.
The results show that the main failure signs are necklecoating's early peeling off, wear and tear, contact and heat fatigues. He also studies the failure characteristics of travellers and the mechanism.