Applied Mechanics and Materials Vol. 621

Abstract: One of the latest solutions in automated production systems is developing of Reconfigurable Manufacturing Systems (RMSs), which have an open structure that allows the integration of new technologies and modifying manufacturing for a new type of production based on adding, removing or updating the elements and units in the hardware and software level. To realize the automated processing RMS needs to have decentralized architecture, including hardware (module based) and software reconfiguration, which to enable distributed control, monitoring and diagnostics in real time and dynamic planning processes and resources in the system. One of the ways to realize this architecture is to development RMS control system on the base of IEC 61499 function blocks (FBs). Important part of the control system is a module for distributed planning and scheduling of processes, which consists all available information for technology of the products. This paper presents an approach for development of scheduling and planning modules in reconfiguration cutting work station on the base of IEC 61499 function blocks.

Abstract: DF10 filter rod forming machine produced by Italy GD Automatic Machinery Ltd is the world's fastest filter rod maker adopting the design of dual-channel. To achieve automatic sampling detection on line, a PLC-based automatic separate channel filter rod sampling detection system has been designed. Mainly composed of a sampling and launching device, matching tube, receiving device, a test instruments, PLC control unit and data terminal, the system first samples the filter rods from the two channels, then launches them into the test instrument to measure their physical parameters, and after wards send the real-time feedback of testing data to the data terminal. The application results show that the system has the advantages of convenient operation, high stability, safety and reliability. With an effective batch’s completion rate above 98%, it greatly reduces the labor intensity of operators and QC personnel, and significantly improves the quality control capacity of filter rod production.

Abstract: The engineering vehicle cab FOPS (falling-object protective structures) mainly contain two parts: top guard and front guard. According to the characteristics of the engineering vehicle cab security architectures, the simulation that top guard is impacted by the falling hammer is made by non-linear analysis software – LS-DYNA. The breakage phenomenon is also researched. The stiffness of the top guard is so weak that the hammer’s displacement is too large, which leads to the impact resistance of top guard is unqualified. Based on this, the cause of the stiffness insufficient is researched. By orthogonal experimental design for the dominant factors, it makes the simulation performance of the top guard meet the requirements of the national standard. On this basis, the simulation mechanical bearing capacity of the front guard is done by LS-DYNA, while the experimental research is also accomplished. By contrasting the result of simulation and experiment, it turns that simulative result coincides with the experimental well.

Abstract: Sheet metal deep-draw die is primarily constructed with draw bead, which is then modified based on trial and error to obtain a successful forming without splitting. This work aims at a robust design of forming die using numerical analysis and the Taguchi method. A three dimensional elastoplastic finite element model of a sheet metal forming process of SPCEN steel has been successfully developed using the material flow stress obtained from the modified Erichsen cup test. The model was validated with the actual forming experiment and the results agreed well. The influence of draw bead parameters on splitting and thinning distributions were examined using the Taguchi method. Four parameters, namely the friction coefficient, draw bead height, radius and shoulder radius were investigated. The Taguchi main effect analysis and ANOVA results show that the height and shoulder radius of the draw bead are the most important factor influencing the thinning distribution. Applying the Taguchi method and using the minimum thinning percentage as the design criteria, the optimum die design was identified as height, radius, shoulder radius and the friction coefficient of 4, 8, 8 mm and 0.125 respectively. The verified finite element model using the optimum die design was conducted. The predicted Taguchi response was within 5.9% from finite element analysis prediction. The improvement in the reduction of thinning percentage was 22.35%.

Abstract: In this paper, surface waviness produced by turning aluminum parts with abrasive waterjet has been studied regarding changes in some process parameters. Effect of five major parameters such as water pressure, cutting head traverse speed, abrasive mass flow rate, workpiece rotational speed and depth of cut have been investigated using analysis of variances. Second order regression model presented forwaviness.The validity of the model wasconfirmed bycomparing with experimental data. It found thatabrasive mass flow rate, cutting head traverse speed and DOC are the most influencing parameters while water pressure and workpiece rotational speed show lesser effectiveness.

Abstract: The article deals with the mould cooling system design. The goal of design presented in the article was to propose the mould form so to be achieved the shortest time for both mould filling and product cooling. Studied product is intended to serve as a stopper in the automotive spotlight. After filling of mould cavity, the melt has to cool at 100 ° C, only then it is possible to accede to the next phase, which is final pressure. So the cooling and filling time is directly proportional to the reduction of production cost. 3D model of the mould was created in Autodesk Inventor Proffesional software and then solidification of material was simulated in Autodesk Moldflow Insight software. There were considered four types of cooling system in the article and the best one from the view of time was manufactured and placed into the injection moulding machine Arburg Allrounder 320 C.

Abstract: This paper deals with the numerical investigation of transient behavior and thermal storage capability of a sensible heat storage unit. The former has a cubic configuration with embedded charging tubes; it is used to store solar energy with sand as a storage media. The system operates in the range of low temperature. To analyze their heat storage characteristics (including the bed temperature, energy stored rate, charging energy efficiency), a finite element based 2-D mathematical model has been developed using COMSOL Multiphysics. The results show that sand has an important thermal inertia. However, it was interesting to develop these storage systems in the region where both sand and solar energy were plentiful.

Abstract: Known as the mine's throat, the mine hoist is the key equipment to the underground work lifting materials and personnel. But due to the negative downhole conditions, mine dot signals tend to appear wrong and be perceived inaccurately. In order to avoid the mine accident and ensure the safety of mine transportation operations, this design chooses the single chip microcomputer U101 with an high anti-jamming ability and develops a mine dot signal equipment applied in mine hoist system to test and transmit signals.

Abstract: Considering the energy variation, cylindrical P-wave propagation across a linear elastic rock joint is analyzed. Then parametric studies are carried out to investigate the effects of the wave source distance,the joint stiffness and the incident waveforms on wave propagation across a jointed rock mass.

Abstract: To investigate the corrosion state of subsea pipeline under cathodic protection, the surface potential distribution of the pipeline has to be measured exactly, but it’s very difficult to measure directly in actually. On base of boundary element methods (BEM), a 2D model about pipe’s cathodic protection under sea water was established, and then software to calculate the electric field distribution on pipe surface in even media (seawater) was developed by way of Matlab. The developed software was verified through an experiment in lab. The result shows that numerical calculation based on BEM by Matlab is feasible for cathodic protection electric field of pipe in marine environment.