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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 18, Issue 6 - Dec 2009
Volume 18, Issue 5 - Oct 2009
Volume 18, Issue 4 - Aug 2009
Volume 18, Issue 3 - Jun 2009
Selecting the target year
공작기계 구조설계 분야에서의 CAE 기술응용
Choe, Yeong-Hyu ; Hong, Seong-Uk ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 7~22
Sensitivity Correlations of Electrical Vehicle
Lee, Jeong-Ick ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 337~347
Generally, finite element models used in structural analysis have some uncertainties of the geometric dimensions, applied loads and boundary conditions, as well as in material properties due to the manufacturability of aluminum intensive body. Therefore, it is very important to refine or update a finite element model by correlating it with dynamic and static tests. The structural optimization problems of automotive body are considered for mechanical structures with initial stiffness due to preloading and in operation condition or manufacturing. As the mean compliance and deflection under preloading are chosen as the objective function and constraints, their sensitivities must be derived. The optimization problem is iteratively solved by a sequential convex approximation method in the commercial software. The design variables are corrected by the strain energy scale factor in the element levels. This paper presents an updated method based on the sensitivities of structural responses and the residual error vectors between experimental and simulation models.
A Study on the Characteristics of Domestic Vehicle on the Roof Crush Test Considering the Enhanced Safety Standard, FMVSS 216
Kim, Eun-Hee ; Lee, Jae-Kwang ; Lee, Moon-Gu ; Hong, Min-Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 348~354
In order to reduce the risk of roll over crash, one of the greatest risk events, National Highway Traffic Safety Administration(NHTSA) issued Notice of Proposed Rulemaking(NPRM) enhancing the safety standard on roof crush resistance, FMVSS No. 216 and changing some part of the test procedure. According to this NPRM, the boundary Gross Vehicle Weight Rating(GVWR) of the vehicles applied by this standard is extended from 2,722kg(6000 lb) to 4,536 kg(10000 lb) and the applied test force is increased from 1.5 times to 2.5 times of Unloaded Vehicle Weight (UVW). Also the current limit on the amount of roof crush, 127mm(5 inch), is replaced with a new requirement of maintaining enough headroom without touching the head of a seated 50% male dummy. In this paper, we carried out the rollover crash test on some domestic cars and investigated their safety due to the KMVSS No. 92 and the enhanced safety standard, FMVSS No. 216, respectively. The result shows that most of them can satisfy the new standards but further tests will be necessary, especially for heavier cars.
Vibration Analysis of Bus Structure using Sensitivity Analysis of Bus Component Structures
Lee, Sang-Beom ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 355~361
In this paper, an analysis technique is presented for performing the effective design of bus structure. Sensitivity analysis is carried out for the natural frequency of component structures consisting of bus B.I.W. Local vibration modes of substructure, which large affect on the global vibration mode of the bus B.I.W., are obtained through the sensitivity analysis technique using the mathematical chain rule. And also the design variables, which are determined from the sensitivity analysis, are redesigned through optimum design process. The proposed analysis technique shows that the bus structure can be effectively designed considering the vibration characteristics.
An Experimental Study on the Failure Characteristics of Flip Chips in Cyclic Bending Test
Lee, Yong-Sung ; Jeong, Jong-Seol ; Kim, Hong-Seok ; Shin, Ki-Hoon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 362~368
In general, circuit board assemblies experience various mechanical loadings during assembly and in actual use. The repeated cyclic bending can cause electrical failures due to circuit board cracks, solder interconnects cracks, and the component cracks. In this paper, we report on the failure characteristics of semiconductor chips under the repeated cyclic bending. We first describe a new 4-point bending tester, which is developed according to JEDEC standard No. 22B113. The performance of the tester is then estimated through actual experiments. Test results reveal that the cracks first occur on the outer balls around 20,000 cycles and gradually propagate to the inner balls where cracks are found around 70,000 cycles.
Analysis of Nano-contact Between Nano-asperities Using Atomic Force Microscopy
Ahn, Hyo-Sok ; Jang, Dong-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 369~374
In micro/nano-scale contacts in MEMS and NEMS, capillary and van der Waals forces generated around contacting micro-asperities significantly influence the performance of concerning device as they are closely related to adhesion and stiction of interacting surfaces. In this regard, it is of prime importance to accurately estimate the magnitude of surface forces so that an optimal solution for reducing friction and adhesion of micro/nano-surfaces may be obtained We introduced an effective method to calculate these surface forces based on topography information obtained from an atomic force microscope. This method was used to calculate surface forces generated in the contact interface formed between diamond-like carbon coating and
ball. This method is shown to effectively demonstrate the influence of capillary force in the contact area, especially in humid atmosphere.
Development of Automatic Bundle Machine for Vegetables(II) : Prototype Manufacture and Performance Test
Kim, Yong-Seok ; Park, Sung-Ho ; Yang, Soon-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 375~380
In this paper, it has been proposed an automatic vegetable bundling mechanism that makes use of heat melt sticking. The proposed mechanism is consisted of three modules for the rationality of manufacture. Design specification has been determined by the bundling mechanism that was optimized mechanically. And, it has been manufactured the prototype of the automatic bundling machine. It has been carried out directly the field test for verification of performance in farmhouse which produces vegetable. In field test, this bundling machine showed efficiency of about 3.6 times than the manual working by manpower, and other performance it got satisfied result. This automatic vegetable-bundling machine was already registered as the agricultural machine. and This machine will be commercialized soon.
Dynamic Filtering of End-milling Force Using Wavelet Filter Bank
Cho, Hee-Geun ; Chin, Do-Hun ; Yoon, Moon-Chul ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 381~387
The end-milling force behaviour is very complex and it is related to a de-noising phenomenon, so it is very difficult to detect and diagnose this static cutting force phenomenon. This paper presents a new method of filtering of end-milling force in end-milling operation using filter bank technique, based on the wavelet transform. In this paper by comparing the history of end-milling force using wavelet filtering the fundamental end-milling property of the wavelet transform is well reviewed and analyzed. This result of wavelet transform using filter bank shows the possible static prediction of end-milling force with severe dynamic properties such as chatter in end-milling operation.
A Study on Thermal Analysis for Magnetostrictive Actuator Using Compressed Air Cooling
Kwak, Yong-Kil ; Mostofa, G. ; Hwang, Jin-Dong ; Kim, Sun-Ho ; Ahn, Jung-Hwan ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 388~394
Precision positioning system with magnetostrictive actuator(MA) has widely used in manufacturing devices to control the positioning accuracy to meet the high load and stroke requirements. It has many advantage in comparison with piezoelectic actuator; high force, high strain, high efficient etc. But, the performance of Terfenol-D, the commercially available magnetostrictive material, is highly dependent on the prestress, magnetic field intensity and temperature. Therefore, thermal strain of magnetostrictive material obstructs precision position control of magnetostrictive actuator, magnetostrictive actuator is need of cooling system. In this paper, cooling system using compressed cold air is developed and proper temperature and velocity of compressed cold air is studied by thermal analysis according to applied current.
Effect of Specimen Thickness on Probability Distribution of Fatigue Crack Propagation Behavior in Magnesium Alloy AZ31
Choi, Seon-Soon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 395~400
As the variables affecting the fatigue behavior have uncertainty, the fatigue crack propagation is stochastic in nature. Therefore, the fatigue life prediction is critical for the design and the maintenance of many structural components. In this study, fatigue experiments are conducted on the specimens of magnesium alloy under the different thicknesses of specimen. The effects of specimen thickness on the probability distribution of the fatigue crack propagation life and the crack size are estimated experimentally. The probability distribution of the crack size and the fatigue life for different specimen thicknesses are investigated by Anderson-Darling test and the best fit for those probability distributions are also presented.
Analyses of Fracture Parameters and Prediction of Crack Propagation Path on Delamination in the LSI Package
Chung, Nam-Yong ; Park, Cheol-Hee ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 401~409
This paper presents a method of calculating the stress intensity factor (K) and crack propagation direction (
) at the crack-tip that is associated with delamination in the large scale integration(LSI) package. To establish a reasonable strength evaluation method and life prediction, it is necessary to assess fracture parameters under various fracture conditions. Therefore, we conducted quantitative stress singularity analysis considering thermal stress simulating the changes of crack length (a), (h) and (v) in delamination using the 2-dimensional elastic boundary element method (BEM), and from these results predicted crack propagation direction and path.
Optimum Design of SUV Suspension Parameters Considering Rollover Stability
Lee, Sang-Beom ; Jang, Young-Jin ; Yim, Hong-Jae ; Nah, Do-Baek ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 410~416
In recent years, the rollover accident of large class of vehicles has become important safety issue. Even though the rollover form a small percentage of all traffic accidents, they have a fatal effect upon the driver and passenger. Among the traffic accidents occurred in driving, the rollover is the major cause of traffic fatalities. Therefore, it is required to develop the analytical and experimental techniques for predicting rollover propensity of vehicles and also to improve the vehicle suspension design in the viewpoint of rollover resistance. In this study, the parameter sensitivities for the roll angle of SUV suspension are analyzed, and then the determined design parameters are optimized by using the regression model function of the response surface methods. The analysis results show that the roll angle of the optimized vehicle is decreased as compared with the initial vehicle and also the rollover possibility is decreased when the roll rate of the front suspension is larger than the roll rate of the rear suspension.
Reduction of Design Variables for Automated Optimization of Injection Mold Cooling Circuit
Rhee, B.O. ; Choi, J.H. ; Tae, J.S. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 417~422
The injection mold cooling circuit optimization was studied with a response surface method in the previous research. It took so much time to find an optimum solution for a large product due to an extensive amount of calculation time for the CAE analysis. In order to use the optimization technique in the actual design process, the calculation time should be much reduced. In this study, we tried to reduce the number of design variables with the concept of the close relationship between the depth and the distance of cooling channel. The optimum ratio of the distance to the depth of cooling channels for a 2-dimensional problem was 2.0 so that the optimum ratio was again sought out for 4 large automotive parts. Therefore, the number of design variables for the cooling circuit optimization can be reduced in half, resulting in much faster running time for the optimization as a design tool.
A Study on the Motion Base Control by Using Maya
Hong, Min-Sung ; Kim, Joo-Chul ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 423~429
The motion base to a film used in 4D cinema theaters or theme parks is different depending on the operator's control or hardware system and this causes inefficiency in management of the theater. There are several different simulation software on the present market, but these are difficult for an animation producer to use them. This study introduces the idea in which a film producer simulates the movement of the motion base by using computer graphic animation tools mostly adopted by production for creating 3D animation and motion control data. Maya and 3D Cross were used to show the path of a motion camera visually. Attitude and axis control data were extracted from the movement of the virtual motion base and were used to control a prototype of the motion base. As a result, the motion control data from computer graphic animation tools can be created so that a film producer can create standard motion control data independently regardless of the hardware and operator's skill.
Injection Mold Cooling Circuit Optimization by Back-Propagation Algorithm
Rhee, B.O. ; Tae, J.S. ; Choi, J.H. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 430~435
The cooling stage greatly affects the product quality in the injection molding process. The cooling system that minimizes temperature variance in the product surface will improve the quality and the productivity of products. The cooling circuit optimization problem that was once solved by a response surface method with 4 design variables. It took too much time for the optimization as an industrial design tool. It is desirable to reduce the optimization time. Therefore, we tried the back-propagation algorithm of artificial neural network(BPN) to find an optimum solution in the cooling circuit design in this research. We tried various ways to select training points for the BPN. The same optimum solution was obtained by applying the BPN with reduced number of training points by the fractional factorial design.
A Study on New Technology Development of Air Filter Sealing for Vehicles and Upper-under Cap
Yoon, Sung-Un ; Kim, Jae-Yeol ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 4, 2009, Pages 436~441
An air filter is a device to remove dust from the air supplied to the automotive engine. A requirement for the optimum air filter is to improve the capability to remove particles from the air it takes in, that is the efficiency and amount of dust collection. By removing dust from the air, the air filter prevents the engine cylinder from wear, reduces ventilation resistance, and thus improves engine output and guarantees intake performance. In order to guarantee such air filter performance, it is very important to properly seal the air filter. For passenger cars made in Korea, the air filters are fabricated with steel caps as their frames are large and their engine capacity is big. Recently however, European countries and Japan started using urethane for manufacturing the air filter, so that all foreign-made cars now have urethane filters. The urethanes used for air filters are applied in two ways: One is to use soft urethane for both top and bottom of the air filter and the other is to use soft urethane for the top and hard urethane for the bottom. Each of these method has unique problems. In this study, hard urethane is used for both top and bottom of the filter in order to improve those problems and increase the sealing efficiency. Especially for the top, NBR (rubber mold) is pre-settled in tough urethane and then the urethane is solidified through foaming, which makes it possible to develop a solid and double-sealed filter.