To study the traffic characteristic and axles load spectra of a heavy load expressway, WIM data was collected, axle configuration and vehicles classification was determined. The characteristic of truck traffic monthly distribution and the truck hourly distribution was studied and axle load spectra for major tuck types were developed. The results show that there were more than 30 truck types running on the expressway, the peaks of truck traffic monthly distribution was in April, September and December and the rush hour of the hourly distribution was at midnight. All major axles had a bimodal pattern of load spectra. The second peak of single axle was about 12 to 13 ton, tandem axle 14 to 22 ton and the tridem axle 28 to 32 ton. More than 50% of axles were overloading.
Due to the mining vehicle in operation conditions,tires consumption,tire cost in transportation costs about 10% ～20%,tire consumption directly related to the mining vehicle operation cost and transportation efficiency.Based on the impact of mining vehicle tire main factors analysis,puts forward the correct use and maintenance of the vehicle tire measures,in order to prolong the service life of tires.
This paper proves the classification theorem and the Levi decomposition theorem ofφ-free n-Lie algebras over the field of characteristic zero.The equivalent conditions of the solvability of n-Lie algebras over an arbitrary field F are also studied.
In order to avoid the disadvantages of huge computational complexity and poor matching performance in existing scale invariant feature transform(SIFT) descriptors for color images,a novel SIFT descriptor for color images based on color quantization matrix was given.The quantization matrix was obtained by triple-color components.And it was applied to generate a 128-dimensional SIFT descriptor to match color objects.The experimental results showed that,compared with existing SIFT descriptors for color images,this proposed method has the advantages of higher correct matching rate,less matching time and more accurate matching points.This method can effectively match the color objects.
Based on the fact that the scale of application software industry in Hebei Province is ralatively small,the authors pertinently studied the factors that restrict its development and put forward policies and measures to over come the restricts.
Some properties of solvable n-lie algebras have been discussed and three equivalent conditions of the solvability of n-lie algebras have been proven.The concept of a Borel n-subalgebra,and two propositions related to it has been given,too.
This work is a continuation and verification of the original literature by using experimental strategy. Based on the published paper, in order to avoid anti-phase synchronization with two co-rotating rotors system, a vibrating system with two co-rotating rotors installed with nonlinear springs have been proposed, and then, the synchronous condition and the synchronous criterion of the system are theoretically derived. From the analysis mentioned, it is shown that the synchronous state is mainly determined by the structural parameters of the coupling unit, coupling coefficients and positional parameters of the two exciters, etc. The main objective of the present work is to investigate the synchronous mechanism by experiments and simulations in this paper. Some simulation computations are firstly implemented to explain the synchronous mechanism of the system. Additionally, an experimental strategy with synchronous tests and dynamic characteristic tests of the vibrating system are carried out to validate the correctness of the simulation analysis. The simulations and experiments demonstrate that the nonlinear springs can overcome the difference of residual torques of the two motors to realize the synchronization of near zero phase difference under the condition of in-phase difference between two exciters. Finally, the error analysis results among the dynamic testing, synchronous testing results and simulations are discussed. This research can provide theoretical reference for designing large-sized and heavy-duty Vibrating Screens.
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