Applied Mechanics and Materials Vols. 130-134

Abstract: This paper concentrates on modeling the gear transmission system using a three-dimensional finite-element approach for the acoustic radiation analysis and control. The combination of dynamic analysis and vibration response calculation for the gear engagement system can contribute to evaluate acoustic radiation. A case study of for gear engagement system internally excited with gear mesh fluctuation is presented in this research. Acoustic radiation quantity investigation has been carried out by Virtual.Lab Acoustics software. It can be concluded that numerical simulation is very important during gear system design and noise control.

Abstract: In recent years, agricultural products are evolving to dynamic and multiplicity. With the product features improved, the capacity and parameters increased and development to the mechanical and electrical integration, The product structure is in increasing complexity and the use conditions increasingly harsh, so the product fault and potential for failure is growing, reliability issues become increasingly prominent. Has analyzed the reliability characteristics of agricultural product, proposed the principle and method of reliability design using reliability project theory. it is very important for improving the quality and reliability of agricultural product and the majority of agricultural design workers must rise to attach great importance.

Abstract: In this paper, the instrument is designed by basing on principle of the measurement method of straightness error measurement of deep hole, the design technologies of A/D converters, automatic control and computer are used. The instrument can automatically acquire data, the process of acquire data is convenient, fast, safe and the data is reliable.

Abstract: This essay mainly focuses on the design of the track of miller tools used on the cleaning of residues in aluminum liquid container. It puts forward a running gear of compound discoidal milling cutter dealt with the cleaning of residues in aluminum liquid container with a feature of double helical lines cutting and planetary motion for the first time with the application of the metal machining theory. Besides, it analyzes and ensures many issues such as the track of discoidal milling cutters, scope of lead angle as well as the track of planetary motion.

Abstract: Flue gas turbine is the key equipment of the refinery catalytic cracking unit and blades are important component parts. However, blades faults are accounted for a large proportion of various failures in the flue gas turbine. According to it, ANSYS finite element software is applied to analysis Level 1 dynamic blade stress and strain and obtained the stress and strain distribution of the gas turbine, the greatest stress is at the root of the blade suction side and pressure on both sides of the Ministry basin, the maximum stress intensity value is 169.698MPa and the maximum equivalent elastic strain is 0.194×10^-3.Then at the basic of the stress analysis to strength check of blade’s body and at last proved that it meet the design stress intensity. Through theoretic analysis and the result of stress and strain analysis is proved that ANSYS software is acceptable and efficient. At the same time it provides a theoretical basis for engineering.

Abstract: A new SVLX static mixer is original designed by the author with the structure of alternative connection of the SV static mixing unit and cross shaped stationary helical fin. The two-phase flow is sheared, separated, impinged and rotated by SV static mixing unit, as well as whirled by the cross shaped stationary helical fin. Hence the mixer efficiency is enhanced. The most advantage of this design is the mixer efficiency is more enhanced with none applied force. Followed by the static mixer structure illustration, the preliminary analysis of the two-phase flow field is carried out, which provides some proofs for the selection and optimization of the new SVLX static mixer structural parameters.

Abstract: The tooth surface shape of spiral bevel gear is complex. In the detection process of errors tooth surface model is constructed based on coordinate data of limited the actual tooth surface sampling points. The model is used to analysis and manufacture of gear to meet the processing requirements. NURBS (non-uniform rational B-Spline) method is the most effective reconstruction method for geometry there are both freedom and analytic curves and surfaces. NURBS method is used to calculate non-uniform knot vector, NURBS control points and B-Spline inverse and reconstruct tooth surface. Reconstructionof spiral bevel gears in using NURBS is achieved and the tooth surface reconstruction is drawn out in Open GL in VC environment. And then reconstruction error on the tooth surface is analyzed. It proves that using the method of NURBS to reconstruct spiral bevel gear tooth surface is correct and feasible.

Abstract: To solve the problem that hydropower stations equipped with propeller turbine are not able to work under small flow conditions in dry seasons, after analyzing the influencing factors, a rebuilding scheme for decreasing capacity to increase efficiency is proposed. The distribution of velocity circulation at the inlet and the outlet is researched in this paper. Some key technologies in computer-aided hydraulic design, including unfolded aerofoil converted to cylindrical surface and intelligent extension for curves, are solved. The proposed version is feasible and the composed CAD software is reliable and accurate.

Abstract: Axial force is one of the main factors which affect the pump safety and reliability during the operation of pumps, especially in multi-stage centrifugal pumps. 150QJ20 type deep-well centrifugal pump (DCP) is selected as an example to research the pump performance and axial force with the numerical simulation and experiment method. The numerical simulation results were compared with experimental measurements, and such result was analyzed. The results show that the change trend of the pump performance and axial force acquired by numerical and experiment is similar. At rated operating point, the error of axial force between the numerical simulation and experimental measurements is less than 3%. This confirmed the feasibility of predict the pump performance by numerical simulation method.

Abstract: In order to improve the maneuverability and the automation of loader working device, this paper establishes it’s Electro-Hydraulic Servo Position System mathematical model based on the working principle of its Hydraulic System, and designs a position controller for the loader working device using Single Neuron PID Control Algorithm. The tests of simulation were carried out on the platform of Matlab/Simulink. The simulation results show that Single Neuron PID Control Algorithm can improve the system control effect, process its real-time and static-dynamic characteristics with a simple controller.