Advanced Materials Research Vols. 945-949

Abstract: Aiming at the actual demand of complex equipment fault diagnosis, this paper made the fault intelligent diagnosis technology of a certain type of equipment as research object, analyzed the characteristics of equipment and its faults, presented four strategy to solve the problem: Circuit-decomposition, the decision tree, confirm key component using FMECA and establish model by PSPICE.And proving it by actual circuit.

Abstract: An on-line monitoring system of hydrodynamic lubricant supply conditions for the back-up roll’s oil film bearing of 1420mm cold rolling mill was developed for providing real time monitoring so as to avoid unexpected breakdown of the production line. The monitoring parameters of supply pressure, supply temperature and supply flow rate show that the monitoring system software with real-time event trigger mechanism and intelligent storage algorithm solves the issue of data overflow in the continuous record and ensure the safety of data transmission. Test results for hydrodynamic lubricant supply conditions in the industrial production are reported, which indicated that established software architecture and programming methods construct a stable and reliable monitoring system, which provides early warnings for the safe production.

Abstract: Through analyzing the fault characteristics of the wireless communication equipment and according to the object oriented method, the fault diagnosis model based on knowledge for wireless communication equipment fault characteristics was designed. In order to expand and maintenance knowledge conveniently, and realize the reuse of knowledge, the fault diagnosis model were modeled in the way of domain knowledge, reasoning knowledge and task knowledge according to CommonKADS ideology. In the end VC++6.0 and SQL Server 2005 were used as the development tool and database, the development of prototype system was realized.

Abstract: For the variable speed estimation of wheel-bearings in strong background noise, a novel method with the short-time Fourier transform and BP neural network (STFT-BPNN) is proposed. In the method, it calculates the time-frequency spectrum with STFT technique. Then the instantaneous frequency is estimated by peak detection. Taking the instantaneous frequencies as the input vectors, the BP neural network is trained to fit the discrete instantaneous frequencies. The effectiveness of proposed method is demonstrated by simulation. Experimental results show that proposed method provides better performance on variable speed estimation for wheel-bearings.

Abstract: for researching standby Compound system,the authors propose a new Laplace transform method which are used for deducing mathematical expression of system reliable lifetime 。The reliability function is simulated with MATLAB software and analyed,The results show that this method is not only effective but also simple and practical.

Abstract: This study analyzed requirements of the wind turbine blade fatigue loading, and proposed a novel design method for blade fatigue loading control system. The hardware and software of the control system were designed. Frequency scanning, frequency control and amplitude tracking flow chart have been presented. A control system of the fatigue loading facility was built based on this investigation. The loading test of wind turbine blade has been completed. The data and curve acquired from the test prove that the control system could satisfy loading requirements.

Abstract: To improve the flexibility performance of tracked vehicles, lots of jobs has been done in the refit of driveline. Therefore, tough risks are transferred to the strength and fatigue life of suspension device. Through analyzing the effect of driveline refit to the performance of suspension device, a scheme that enhancing the stiffness of the torsion bar is proposed. By using the MSC.Patran/Nastran software, the model of suspension device is constructed, via the simulation of the stress state and fatigue strength that is loaded on the main suspension parts at the static equilibrium position and the maximum stroke position of equilibrium elbow, and performance testing on actual roads, this scheme is considered to be reliable.

Abstract: The finite element analysis of large air cooling tower was carried out using ABAQUS. On the basis of strength above,8 types of the axial force are analyzed and summarized, find valuable rules, and put forward the further optimization design. So that it can satisfy the strength and stability of air cooling tower, the structure is more reasonable, reduce weight, reduce the cost.

Abstract: According to amonoral parking space in traverse table platform technology parameters requirements and structural characteristics, the use of Pro/e software established structure model and imported into the finite element analysis software analysis Workbench, steel structure of the static analysis. Calculated the steel structures in design load maximum deformation.The results show that, by pro/E a structure model and the calculation method is reasonable, the calculation is of high accuracy, profile choose the proper size, structure deformation meet the design requirements.

Abstract: The finite element model of the concrete mixing truck’s frame is builded by using shell as basic element, and the process of building the finite element model of the balance suspension is introduced in detail. Based on this, frame’s stress on five types of typical operating conditions are calculated by using the finite element analysis software, NASTRAN, and results can show the dangerous position and the maximum stress position on the frame. The analysis result on structural strength can provide the basis for further improving the frame structure.