Applied Mechanics and Materials Vol. 197

Abstract: This paper is focusing on the application of control chart based on fuzzy similarity in the monitor of products quality. Methodologically, this paper verified a way that transferring the form of real product dates to that can be used in fuzzy control chart, and, moreover, successfully calculated and traced and control chart.

Abstract: As a kind of piezo actuator, impact drive mechanism (IDM) has advantages in precision machinery and instruments. Several IDMs are used in parallel to realize some motion mechanisms which have multi degrees of freedom (DOF). Two motion mechanisms are designed subsequently, and a spherical motor is designed and assembled in principle based on one of them. Experiment results reveal that this design method is feasible, but some problems exist, for example, vibration is serious. These problems should be solved in follow-up study.

Abstract: The machining difficulty of cycloid disk has limited the extensive application of Cycloidal-pin gear planetary mechanism. The conventional machining methods and devices are a main reason. A new method is provided through a 3D software simulation and CNC numerical machining to assure the machining precision of cycloid disk and reduce the machining difficulty. The detail comparisons with old methods are analysized. The modeling and path stimulation are expressed. The NC programs are output. The method can largely reduce the production difficulty of cycloid disk and make high precise cycloidal transmission more accessible.

Abstract: The structure and working principle of a new translational piston rotary compressor was introduced and made theoretical analysis in this paper. It was pointed out that the translational piston rotary compressor had not only fine practical, which with less friction loss and leak loss than the traditionally rotary compressor, but also the advantage of simply structure and technics and low manufacturing cost. The rotary compressor was practical and promising.

Abstract: The flow of reverse modeling based on section feature is analyzed, and three algorithms of B-spline curve fitting are studied. Then by adopting the three methods, the sectional curve fitting of the point cloud data is achieved for the stator vane of hydraulic torque converter. Through comparing the errors and curvature of the fitting curves, the effect of curve fitting is analyzed and valuable conclusions are obtained.

Abstract: This article discusses the development and the establishment of turbulent flow downstream of disturbers like a valve 50% open, valve 70% open, Tee and 90° double bend in perpendicular planes. Associated with these disturbers, a perforated plate flow conditioner is installed to examine his performances to produce the fully developed pipe flow as suggested by standards ISO5167 and AGA3. The study focused mainly on the numerical analysis of the velocity contours at several axial stations downstream the disturbers. For the simulation, code CFD Fluent was used. The study of the disturbed flow is examined with three Reynolds numbers. The results show a very good prediction of the CFD code Fluent for the flow development downstream the disturbers and conditioner which makes the code very efficient for conception of a new flow conditioner not described by the standards. It was also found that the valve 50% open could be considered a reference disturber for analyzing the development of turbulent flows. As interesting results, is the effectiveness of the perforated plate to produce the flow developed pipe flow at about z/D=10 downstream the disturber. This result is very important for flow measurement accuracy as suggested by the standards. An experimental study is needed to validate these results.

Abstract: According to the purpose and requirements of a virtual test, the complex mechanism of the combine harvester was abstracted and simplified to some extent during modeling, but in order to guarantee the closeness between simulation result and the reality, attention was paid to keeping the total mass of all components close to the actual mass of the combine harvester and reducing workload during modeling. The vibration test of the cleaning operation includes horizontal vibration and vertical vibration. The test conditions are that: the combine harvester is still and has no load and only the engine runs, or the engine and the cleaning component run simultaneously. To guarantee the extractions are thrown out of the machine in the rear end of the screen, the backward slip of the extractions is greater than forward slip. The simulation result satisfactorily reflects the real situation and is same as theoretical analysis. The result indicates the virtual test and the real test are consistent.

Abstract: A structural optimization and efficient tubular heat exchanger was designed. Compared with the ordinary heat exchanger on aspects of heat transfer area, heat loss and the structure, this kind of heat exchanger has the advantages of compact structure, high efficiency, low emissions as well as the function of temperature automatic adjustment, so it is of great promotional value.

Abstract: Tube blanking has application potential in bearing manufacturing. However, compared with sheet blank, tube balnking has been rarely studied yet. In order to achieve an intensive understanding of the mechanism of the tube blanking process, a finite element analysis has been carried out by using the commercial software package ANSYS. According to the special requirement of the tube blanking, the major process attributes, such as punch-die clearance, edge radii of tools and contact between tool/workpiece have been taken into account in the finite element model. The tube material is 20 mild carbon steel and dimensions are 42.2 mm in outer diameter and 5.3 mm in wall thickness. The distributions of the stress and the equivalent plastic strain have been computed for discussion. It has been realized that the stress status around the tool corners plays an important role in crack generation and growth, thus decides the blanking quality.

Abstract: A three-dimensional finite element model is developed to simulate the integrated system which consists of the fractured bone (femur), bone plate and stabilization screw by using the ANSYS software. The stress and strain distribution of the integrated system is investigated. The numerical model simulates a patient’s imperfect walking under the assumption that the fractured bone is not able to support any load and all body weight was burden by bone plate in fractured bone section. The simulation results reveal that the maximum Von Mises stress on bone plate is much less than yield strength and fatigue strength of Titanium alloy.