The dump is the important part in the open colliery. Slope should bring the huge loss without effective forecast during the work. Many methods have been used in the slope stability analysis to escape the slope. In this paper, the methods used in the analysis have been list and forecast reasearch should be discuss.
Common digital differential analyzer(DDA)linear interpolation error is lower than a pulse equivalent, and the output pulse along each axis is not uniform. New DDA linear interpolation flow chart was obtained by combining a quick algorithm of DDA interpolation and interpolating algorithm for pulses uniformization with common DDA linear interpolation principle. The relationship between interpolation error and pulse equivalent was demonstrated in detail. As the results shows, the new DDA with high precision machining but simple algorithm, increased interpolating speed; the new algorithm make the generation of uniform pulse series come true, which is of great importance to keep stepping motor rotating steadily without missing steps; At coordinate origin, interpolation error is lower than 0.42 pulse equivalent, while the interpolation point is not at coordinate origin, interpolation error is lower than 0.5 pulse equivalent.
In thisexperiment, nanoCaCO3, nanoSiO2, nanoTiO2and nanoZnO were chosen and added into waterborne camouflage coating respectively to make nanomaterial camouflage coatings. Both the surface tension and the contact angle of the coating (on steel plate and on concrete blocks) were measured by the OCA15+ video optics contact angle admeasuring apparatus; the nanomaterials influence on the interfacial properties of camouflage coating were studied based on its changing concentration. The experiment indicates that the relationship between the concentration of nanomaterial and the surface tension of the coating coincides with the Szyszkowski formula, but only when the concentration is relatively low; nanoSiO2has the best effect in improving the interfacial properties of camouflage coatings. It also proves that adding proper nanomaterial is an efficient way to improve the coatings durability.
Since boom-type aerial equipment has complex dynamic characteristic under the action of random wind loads, traditional methods are hard to reflect its dynamic response. We put forward an analysis method for wind-induced random vibration response of aerial working arms based on finite element and pseudo-excitation methods. In this analysis, the pulse-wind-load-induced vibration was regarded as a random vibration under multi-point coherent steady random excitation, and Davenport wind speed spectra invariant with height were adopted with consideration of multi-point wind excitation correlation. We analyzed the wind-induced random vibration of the working arm of a folding-arm-type aerial operation vehicle. The analysis results confirm the reliability of the analysis method, so as to offer a feasible way for analyzing the dynamic wind-induced vibration response of large boom-type aerial equipment.
By means of resistance strain gauge and multifunctional test bench of materials mechanics, the relation curve between the axial compressive forces of the two-ends hinged column with a rectangular cross-section and total bridge strain was obtained by the resistance strain measurement method, accordingly, by the horizontal asymptote of this relation curve the critical load of compression column was obtained. The study indicates that the critical load obtained respectively by the resistance strain measurement method and Euler formula theory fits very well, and the research results verified the reliability of the experimental method.
The mechanical models with and without thimble constraints for the turning work-piece are built respectively, applying ABAQUS software to analyze the modes of work-piece, then the law of the influence that different turning depth on the bending modes of work-piece is obtained. The study indicates that each-order natural frequency increase gradually in linear form for the work-piece without thimble constraint, while for the work-piece with thimble constraint, the natural frequency of the first four orders decrease linearly with the increase in the turning depth, but the change of high order frequency is relatively complicated.
By means of the QLVC-ZSA1 vibration signals analyzer and an acceleration sensor, three experimental schemes, (1) different spindle speed and (2) different feed rate for the first half and the second half of the same feed length, and (3) three successive feeds under the same turning parameters, were designed to study quantitatively the vibration responses of the cutting tool in the turning process by the numerically controlled lathe. The study indicated that (1) with the increase in the spindle speed and feed rate, the maximum self-power spectral density of the tool vibration also increased, while the corresponding vibration frequency decreased; (2) with the increase of the material removal during the turning, the maximum self-power spectral density of the tool vibration displayed a increasing trend and its average value varies from 5.0 to 9.0 , and the frequency of the maximum tool vibration energy concentrated at the about 3750Hz.
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