Advanced Materials Research Vols. 383-390

Abstract: H₂S existed in some oil-gas field, resulting in many drill pipe hydrogen embrittlement and stress corrosion cracking accident during the drilling, causing huge losses, particularly during blowout and pipe fall into the bottom caused by hydrogen embrittlement, would lead to serious accident .There were a lot examples in history, in view of the situation, this paper analyzed of the mechanism of the hazards of H₂S to the drill pipe, proposed the technical conditions and using requirements to select anti-sulfur drill pipe. After field using, selecting the proper types of anti-sulfur drill can improve the safety of drilling. According to field application summed some attention in the process of using the anti-s drill issue to be aware of.

Abstract: At the moving crossbeam levitation system of the gantry NC machine tool, backstepping adaptive mode control was proposed to achieve the high precision and steady levitation of the gap due to the effect of the cutting force on magnetic levitation system. Considering that the speed state variable is nonmeasurable, a state filter K was designed to estimate the parameter on line. And then the adaptive backstepping controller is designed for the nonlinear magnetic levitation system. The system can achieve the global trajectory tracking of the output because of its unique structure and the capacity to the system disturbance, while all the signals of this closed-loop system can remain bounded via the Lyapunouv theory. The simulation results show this method can keep the stability of levitation system. Meantime, this controller has powerful ability of suppressing disturbance and high rigidity.

Abstract: Based on finite element analysis, the static transmitted torque of Hydraulic Expansion Toolholder is validated. When Hydraulic Expansion Toolholder is on the static state, the article does the analysis of the contact region deformation and contact stress under different structure sizes. The calculation and the analysis results can provide theoretical guidance for Toolholder application and structure design.

Abstract: Rotating machinery becomes more and more large and complex, increasingly high degree of automation. Rotating machinery fault could easily lead to heavy losses. Therefore, the requirements of monitoring and diagnosis systems are increasing high. In this paper, the superiority of the application of virtual instrument on condition monitoring and diagnosis system building in the industrial production is described. And then, the rotor system as the main research object, a rotating machinery condition monitoring and diagnosis system is built by using Virtual Instrument technology. At the same time, the structure of the condition monitoring and diagnosis system is discussed. Besides, data acquisition process and fault features recognition method are discussed as well. Finally, the correctness and accuracy of fault detection are verified by means of experiments.

Abstract: The possibility of decomposition of cefotaxime sodium wastewater by ultrasonic Fenton method was discussed in this paper. The influence of various experimental parameters on the decomposition of the wastewater was investigated. The experiment results showed that 44.1% of COD can be removed and the value of BOD5/COD increased up to 0.99, revealing that the combined ultrasonic Fenton technology is an effectively method to treat the cefotaxime sodium wastewater.

Abstract: Finite element simulation is utilized in an aluminum alloy 2014 butt weld with the three kinds of welding processes, namely the filler wire Tungsten Inert Gas (TIG) welding, the laser welding and laser-TIG hybrid welding. The simulated results are in good agreement with the weld cross sections for the TIG and the laser welding, and basically in agreement with that for the laser-TIG hybrid welding using the actual welding parameters. Furthermore, the simulated results shown that the longitudinal residual stresses after welding are the largest for the laser welding and the laser-TIG hybrid welding, the maximum of which are approximate to 300MPa and are 1.2 times of that for the TIG welding. However, the residual stresses would be relatively decreased by backing molten with TIG welding and preheating before welding; the maximum longitudinal residual stresses for the laser welding and the laser-TIG hybrid welding could be decreased remarkably by about 50%.

Abstract: The paper is concerned with the vibration for the articulated dump truck (ADT) which is multi-axle vehicle and different from rigid dump truck. The balanced suspension was employed as the rear suspension in the 60t ADT which the paper takes as the research object. A vibration model of 6 dof for the truck was proposed. The impact of the variation of longitudinal center of gravity position of rear sprung mass and rear suspension stiffness on vibration was investigated in stochastic excitation of the truck in the frequency domain. It is found that it is beneficial to the comfort of the truck when the center of gravity of the sprung mass moves forward and the impact of rear sprung stiffness on vibration is not too great. The results of the vibration for the truck are provided for the design of the 60t ADT.

Abstract: For rocks complexity, geologic drilling is a high cost project, and it is high risk. Drill monitor is an important tool in monitoring drilling, scientific analysis and decision. It can continuously monitor drilling process, identify and forecast abnormal operation modes. It is the key means to reduce drilling accidents and ensure high efficiency, high quality and low cost. This paper analyzed some problems of domestic drill monitor based on the research status on drill monitor at home and abroad. Author considered all hydraulic core drilling rig with 2000m drilling capacity as research object, and modularly designed multi-drilling-parameter data acquisition system according to the geologic exploration own characteristics. This system can identify typical drilling operation modes used data handling techniques of wavelet analysis and time series analysis. With implement of state geology investigation strategy, drilling workload increase greatly, drilling depth increase continuously, and the drill monitor has a very wide application prospect.

Abstract: Squirrel-cage rotor line-start permanent magnet synchronous motor can not meet the heavy lifting, frequent starting conditions for the lifting requirements. In order to solve the difficult problem of starting caused by the squirrel-cage rotor line-start permanent magnet synchronous motor (LS-PMSM), a novel wound rotor line-start permanent magnet synchronous motor is proposed in this paper, which uses wound rotor to replace squirrel cage rotor. In this paper, the finite element analysis method is adopted to simulate and analyze the starting process of the motor, through reasonably determining the value of the external rotor resistance, the starting performance of the motor has improved greatly, and lead the motor smoothly into synchronous speed. The simulation results show the correctness and effectiveness of the research methods.

Abstract: In the traditional design of round broach ,the impact tools of broach maybe unable to achieve the requirements for the processing precision, or even occur the situation of partial fracture due to a exaggerated partial deformation. In this article, by using Pro/E we complete the 3D solid modeling and the dimensional parameterization of the impact tools for combination round and spline broach, then import the 3D model into ANSYS, to analyze and solve the whole process of load and deformation at work. It can effectively improve the machining accuracy and the reliability of round broach, shorten the design cycle and reduce cost.