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  • 1
    Electronic Resource
    Electronic Resource
    Study on Fault Detection and Diagnosis of the Edge-Transmission Ball Mill System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2427-2430 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Pieces of large-scale equipment such as a ball mill system are subjected to heavy andalternate loads under the worst working conditions, which result in higher fault rates. However,since such equipment exerts important functions to the economy and industry, it isn’trecommendable to halt production in order to detect the defects under unconfirmed faults. Weexplore a reliable and practical fault diagnosis scheme for the ball mill system that is widely used inthe building material industry. With utilizing the signal acquisition and process system of vibration,the field testing and analysis are performed based on the violent vibration of an edge-transmissionΦ3×11m ball mill system. The primary diagnosis that is based on the configuration of thetransmission system and foundation stiffness is found, and a feasible resolution scheme is obtained,so that the optimal and economic reform scheme is determined. The detailed scheme has beenadopted by the production industry. This study that is based on the fault diagnosis of the edgetransmissionball mill system has a comprehensive significance of theory and reality. This providesa larger basis for vibration inspection and fault diagnosis in building material industries
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2427.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fatigue Life Evaluation of Spot Weldment Using GA and FEM (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 157-162 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: HS40R and EZNCEN are extensively used as components of vehicle bodies because theysatisfy environmental standards and improve fuel ratio. Because vehicle body sheets are becomingthinner and stronger, it is difficult to satisfy the design standards of spot welding joints. This researchpresents the optimization of the welding condition for various welding variables of a spot weldingspecimen by genetic algorithm (GA). After obtaining the optimum welding condition by use of thegenetic algorithm, the fatigue properties of HS40R and EZNCEN spot welded joints are evaluated byusing the finite element method (FEM) to determine the durability and stability of a structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.157.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Fatigue Life of Multi-Lap Welding of Automotives Steel Sheet by QSTS (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 151-156 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper shows how the number of lap of spot welded joints in automotive steel sheetschanges the life -cycle transform of itself. There has been significant developments in the lifeextension of automotive steel sheets, as well as in passenger safety. We verified the validity of theS-N curve of materials by QSTS test. Moreover, we used EZNCEN and HS40R, which are commonlyused as automotive steel sheets because of their excellence in increasing fuel efficiency. The purposeof research was to compare the fatigue life of multi - lap of spot welded joints to there. In addition s,we used the two different kinds of sheets together in the same welding under the same condition.Through this whole process, the hypothesis on the life cycle of lethargy coefficients was found to be ingood agreement with the result of the experiment. That is, when using sheets of the same materials inone welding, the fatigue life of two laps of a spot welded joint was found to be much superior byEZNCEN 5~14%, HS40R 17~30%,and when using each sheet of different materials, we found thedecrease in fatigue life by 6~16%. Finally, the best value from the data was chosen based on theexperiment for the analysis of the fatigue life of each layer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.151.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical Assessment of Stress Analysis in Short Fiber Composites (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 1421-1426 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An investigation of composite mechanics to investigate stress transfer mechanismaccurately, a modification of the conventional shear lag model was attempted by taking fiber end effects into account in discontinuous composite materials. It was found that the major shortcoming of conventional shear lag theory is not being able to provide sufficiently accurate strengthening predictions in elastic regime when the fiber aspect ratio is very small. The reason is due to its neglect of stress transfer across the fiber ends and the stress concentrations that exist in the matrix regions near the fiber ends. To overcome this shortcoming, a more simplified shear lag model introducing the stress concentration factor which is a function of several variables, such as the modulus ratio, the fiber volume fraction, the fiber aspect ratio, is proposed. It is found that the modulus ratio is the most essential parameter among them. Thus, the stress concentration factor is expressed as a function of modulus ratio in the derivation. It is also found that the proposed model gives a good agreement with finite element results and has the capability to correctly predict the variations of the internal quanitities
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.1421.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Quantitative Evaluation of Defect inside Tire by Shearography (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 270-273 (Aug. 2004), p. 696-702 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.270-273.696.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Square-Structure Estimation of Bolt Fastening Conditions with Using PZT Patches (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2812-2816 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper describes a primary study for a new method of enhancing measurement withusing an impedance analysis method that is applied to structural health monitoring. The goal of thisresearch is to show basic information that is used to evaluate the structural health condition withusing piezoelectric sensors. We present a study for the development of a practical and quantitativetechnique for the assessment of the structural health condition with using a piezoelectricimpedance-based technique that is associated with longitudinal wave propagation. The naturalfrequency has a tendency of frequency shifting with respect to the hole size that corresponds to thereal structure’s crack size. To numerically estimate the damage condition, we suggest the Cov(Covariance) and CC (Correlation Coefficient) evaluation methods
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2812.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Principal Stress Separation Using a Combination of Photoelasticity and Thermoelastic Stress Analysis under Biaxial Stress (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1214-1219 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Today, stress measurement methods by thermography and by photoelasticity are widely used to make stress distribution visible. However, it is difficult to separate principal stresses using only one of these methods because only the difference of principal stresses is measured in photoelasticity, and only the sum of the principal stresses is measured in thermograpy. Therefore, the inverse analysis problem must be solved to separate the principal stress in the thermoelastic method and the shear difference integration method must be used for the photoelastic method. Although there are some reports separation of the principal stresses under uniaxial stress by combining the two methods, little research under the biaxial stress has been reported due to the difficulty of experimentation. In this research, the principal stresses under biaxial stress are separated by a combined method. Moreover, it is verified that the thermoelastic stress measurement method is effective to evaluate the stress concentration factor
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.1214.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Shape Design Optimization of the Boom System in High Ladder Vehicle (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 679-684 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A shape design optimization of the boom system in high ladder vehicle modeled by3-dimensional finite elements is carried out. The structural analysis is performed using 3-D FEA (Finite Element Analysis) giving the results of displacements, stresses and natural frequencies. The section height and width of the boom is controlled by the FEA result data. The subproblem approximation method is implemented for the optimal shape based on displacement and principal stress. In the meantime, Lanzcos algorithm method is implemented in order to find the naturalfrequency of the system. The optimal models obtained by three different optimization processes are compared with the initial model and evaluated for economic conditions respectively. It is found that the different shape optimization processes give the different shape optimization results, which suggest their unique optimal shapes under their necessary design condition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.679.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Optimization Conditions of Spot Welding Using Genetic Algorithm (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1301-1304 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1301.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of Strain Rate Variation on Fatigue Life of Spot Welded Joint (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2447-2452 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Resistance spot welding is used extensively to fasten sheet for automotive applications. In many components, these welds should maintain their integrity under severe loading conditions. However fatigue strength of the spot welded joint is considerably lower than base metal due to stress concentration at the nugget edge, and is influenced by its geometrical and mechanical factors such as welding condition and etc. In this paper, it is estimated that effect of strain rate variation on fatigue life of spot welded joint. The analytical method proposed to overcome above difficult using lethargy coefficient concept for evaluating the fatigue life cycle of spot welded joint. The reliability of the life cycle is completed by comparing with the life cycle obtained by fatigue test for the specimen with the welding current. And the above procedure is numerically extended to get the life of dynamic strain rate region
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2447.pdf
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