Applied Mechanics and Materials Vol. 340

Abstract: Soft highway foundation has always been a major target of highway engineering researches, because not only the domestic soft highway foundation processing technologies have shortcomings and also the safety of highway traffic will be affected by the potential risks of soft highway section. The facts have proven that the structural damages have been caused by soft foundation to highway, and the risk coefficient of the soft highway section is very high after the highway is officially open to traffic, and also a series of highway diseases will be caused. In this paper, the characteristics of soft highway section are first summarized, and then the diseases caused by soft highway foundation to highway structure are analyzed, and finally the application of the retaining and protecting technology for the special foundation excavation engineering as well as related maintenances is proposed.

Abstract: Along with the rapid development of the construction industry, the buildings in China will certainly change from the traditional architecture buildings to the new architecture buildings, so as to fulfill the demands of people on living or production. In order to ensure the lasting play of building functions, it is necessary for the construction units to comprehensively control the welding quality of steel supports. In this paper, the application characteristics of steel structure buildings is first analyzed, and accordingly the measures for controlling the steel support welding quality of buildings and the application of the steel support welding reinforcement technology are proposed. It is hoped that this paper can give a help to the follow-up studies.

Abstract: YangMingTan bridge is the longest and super large span river's bridge located on the north area of ChangJiang river in China .That is used on November 6,2011 which span from its north area of the intersection of the third road and ShiMao road. The south location is across the Songhua river channel and tricyclic elevated road linking. The length of the bridge is about 15.42 kilometers and the wide is 41.5 meters,. Two-way eight lane, the design speed of it is 80 kilometers, the biggest accommodation of which can meet the rush hour 9800/h motor vehicles passing.

Abstract: This thesis takes reinforced concrete truss arch bridge---Nanchengzi River Bridge as an example, and adopts bonded steel reinforcement method, section increasing method and deck reinforcement method to reinforce this bridge. It also adopts finite element method to make a calculation and analysis of stress condition of this bridge after reinforcement, and gain the maximum stress value and span deflection of this bridge after reinforcement, so as to provide useful reference for the repairing and reinforcement of this reinforced concrete truss arch bridge.

Abstract: Gear drive system is a complex rotor system through the gears, couplings and others connected. According to the vibration equation of the gear drive system, using the whole transfer matrix method, gear meshing force is analyzed and the whole transfer matrix of meshing gears is deduced. Numerical example shows that the whole transfer matrix method is applied to the vibration analysis of gear drive system has the advantages of convenient modeling, and accurate calculation.

Abstract: This work presented the design and implementation of a wireless acquisition system for seismic signal. 4 distributed signal acquisition stations were integrated to the low-power prototype which composed of 48 acquisition channels, and a star-shaped wireless network was built which is suitable for seismic data transmission using the networking mode of multi-pipe and multi-address switching. A distributed seismic data acquisition system was accomplished which has the function of synchronous control and asynchronous transmission. The key technical problems and solutions of time balance distribution between multi-channel time-sharing switching acquisition and temporary storage, and wireless seismic data transmission is analyzed in detail in this paper. Thus the additional accessories of traditional wired seismograph were greatly reduced, to improve its cable layout trouble and low efficiency of construction in an adverse environment. This system increased efficiency more than 50% and took same exploration effect compared with wired mode in the field application.

Abstract: Cement-stabilized macadam has good mechanical property, but also has the advantages of plate nature, water stability and frost resistance, and it is widely used in the pavement base or sub-base course of expressway. Based on the fundamental mechanical theory of the strength and the global stability of cement stabilization macadam, this article discusses how to design the grading of the cement stabilization macadam and the influencing factors, besides, it also presents the construction control methods of the cement stabilization macadam, which is of guiding significance to the design and construction of the cement stabilization macadam.

Abstract: The traditional regression analysis method cant effectively predict the final deformation of divisional excavation. This paper is going to propose prediction technique of piecewise nonlinear fitting according to deformation law of surrounding rock displacement during divisional tunneling, to construct piecewise nonlinear fitting function. Through comparative analysis in engineering application, it is proved that it can better meet the prediction need for surrounding rock deformation during information zing construction with its higher accurate prediction and correlation coefficient.

Abstract: RBF neural networks possessed the excellent characteristics such as insensitive on the initial weights and parameters with artificial fish-swarm algorithm (AFSA) applied, which made it have abilities to get rid of the local extremum and obtain the global extremum, and called as AFSA-RBF neural networks. In this paper, a new stream turbine vibration fault diagnosis method was presented based on AFSA-RBF neural networks. After quantification and reduction of the diagnosis decision table, the simplified decision table served as the learning samples of AFSA-RBF neural network, and the well-trained neural network was then applied to diagnose stream turbine vibration faults. The diagnosis results show that the proposed method possesses higher convergence speed and diagnosis precision, and is a very effective turbine fault diagnosis method.

Abstract: The mechanical assembly is to achieve mechanical parts or components connected in accordance with the technical requirements of the design, and combine the mechanical parts or components into the machine. The mechanical assembly is an important part of the machinery manufacturing and repair, especially for mechanical repairs, due to the offering of Machinery Manufacturing assembly parts has advantage for Machinery make, this makes the assembly work of an exceptional nature. The quality of assembly work plays a very important role on the machine performance, the duration of the repair work of labor and cost.