Applied Mechanics and Materials Vols. 121-126

Abstract: The issue of asymptotic stability is discussed for generalized neutral-type neural networks with time-varying delays. A new stability condition is presented based on the Lyapunov-Krasovskii method and the inequality technique, which is dependent on the amount of delay. The proposed result is given in the form of a linear matrix inequality (LMI). Finally, an example is given to illustrate our result. This result is of great significance in designs and applications of globally stable of generalized neutral-type neural networks.

Abstract: In this paper the principle of adaptive filter and various least mean square (LMS) adaptive filter algorithm is studied, based on the related hyperbolic tangent function LMS algorithm is presented, referred to as CTanh-LMS algorithm. Simulation results show that, compared with other adaptive filter algorithm, this method has better denoising ability, and the algorithm is simple, fast convergence rate, and can satisfy the gearbox vibration signal denoising requirements. The proposed algorithm can not only solve the gearbox fault feature extraction, and give adaptive filter algorithm research provides a new means, has important theoretical significance and practical value.

Abstract: Flying shear machine is widely used in continuous rolling mill production line, and its performance is largely depended on the transmission system. Here a model is established with multiple backlashes, time-varying mesh stiffness and error excitation to investigate the dynamics performance of the transmission system during the process. Also, effects of parameters are discussed. It’s believed that it will be helpful for the design of the flying shear machine

Abstract: The temperature and humidity in the laboratory are major factors that affect the accuracy of the similar material simulation test. This paper introduced a new similar material simulation laboratory that can keep its temperature and humidity steady. Take the new laboratory as base, doing a test to simulate the rule of overburden rock’s separation precisely. The first step of test is measuring the simulated material’s hardening curve and regressively analyzing hardening curve function. Then doing errors correction to make the simulating result precise and deducing error-correcting formula. At last, getting the rule of a certain working face’s overburden separation using the new method of similar material simulation test.

Abstract: The paper introduces the running and the gnaw rail of the bridge crane and analyses the judgment and the reason of the gnaw rail. The control system of the automatic rectifying deviation solves the problem of the gnaw rail. The paper also illustrates its method, feature, function and principle, etc.

Abstract: This paper builds the design platform for the shield hydraulic support with variable parameters.The platform characterizes the following aspects: support’s mechanical modeling, the whole and parts designing,strength checking. With the aid of VC++ software development environment, the mechanical model with variable parameters is set up and the support design is carried on,including design and check of the whole support and its components,such as top beam,shielding beam,the baseboard and so on. The development of this software could shorten the research and development periods of supports with similar structures and provide the research and development platform for the support design.

Abstract: Mining with filling technology is not only an important part of green mining but also the ideal methods to solve the environmental issues in coal mining. The coal gangue and fly ash and furnace slag were selected as the stowing material and the SL paste as cementing material. These two kinds of material were processed into a toothpaste-like slurry without dehydration on ground and transport to underground with the help of gravity or stowing pump in order to stowing the goaf and control the movement of superincumbent strata .Industrial test at Xinsan colliery showed that such kind of paste filling material has high early strength, when filling body was used for false roof of work-face, the post-strength requirement of paste filling material can ensuring false roof stability.

Abstract: Combined with the system state equation and the measurement equation, a new method of cascade Kalman filter is proposed and applied to the correction of gravity anomaly distortion. In the signal processing procedure, according to the self-correlation sequences of the measurement gravity signal, the relation of the gain matrix K and the self-correlation sequences could be obtain, and the gravity signal at current time can be calculated by the gain matrix K. Emulations and experiments indicate that both the cascade Kalman filter method and the single inverse Kalman filter method are effective in alleviating the distortion of the gravity anomaly signal, but the performance of the cascade Kalman filter method is better than that of single inverse Kalman filter method.

Abstract: The crawling robot can carry the detector set to inspect the mast or the rope, this paper introduced the robot’s composition and the function, and carried on control system's design to the robot

Abstract: The high-speed milling process has been widely used for manufacturing the aeronautical aluminum alloys. And it is quite important to choose the logical milling parameters for improving the precision and surface quality in the high-speed milling aluminum alloys. In this paper, the orthogonal experiments are designed and made to construct the relationships between the milling force and milling factors to 7050-T7541 aluminum alloys. The milling factors are mainly consist of the milling speed, the feed rate, the milling depth and the milling width. The empirical formulas of milling force are derived by multiple linear regression analysis, and the formulas are tested to be correct by the single factor experiment. The research is very important for further study of the aluminum alloys.