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  • 1
    Electronic Resource
    Electronic Resource
    Research on Fuzzy Information Modeling Process of Quality Function Deployment (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 691-696 
    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: In the process of products design, most input information for Quality FunctionDeployment always possess the characteristics of fuzziness and language, so, various inputinformation of house of quality are regarded as language variable, glossary convene of fuzzylanguage and fuzzy numeral. The main idea of modeling of fuzzy information with house of quality isexplained in detail, and fuzzy integrating of custom needs and fuzzy modeling of products planningwith HOQ are proposed. Thus, the fuzzy or qualitative information can be dealt with efficiently, andthe significative decision in fuzzy circumstance can be made
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.691.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Harmonious Design Method for Product Development (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 697-702 
    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: With the development of science and technology, harmonious design will be one of thelatest trends in modern mechanical products development. Based on the harmonious design method,the well synthesized quality products will be invented. It will have little negative influence on societyand the natural environment, and the high utilization rate of resources and the most comprehensivebenefits in the full lifecycle from planning, designing, manufacturing, packaging, and discarded. Theharmonious state can be obtained between products with political, economic, cultural, legal,scientific, natural and social environments. The harmonious design is investigated from the harmonyof design methods; the harmony of product function with performance; and the harmony of productwith product, with human, with technology, with society environment and with natural environment.And the evaluation of harmonious degree and management system are studied in this work, too. Basedon system engineering and economic, cultural, legal, scientific, natural and social environmentfactors, the formula of the complete system of products design is established. Therefore, the newvitality and higher market competitiveness of product can be achieved. Not only the design is forhuman but also for nature, for the harmony of human and nature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.697.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Diagnosis of Local Fault and Identification of Transient Fault Force in Rotating Machinery (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 293-294 (Sept. 2005), p. 475-482 
    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: Model based fault identification techniques can be used to diagnose local faults in rotating machinery; the equivalent loads that represent fault forces can be used to identify the fault location. But in some cases the equivalent loads smeared over many nodes, and make it hard to identify accurate fault location and transient fault force. In this paper, the fault location is identified using least squares fitting approach by the system’s vibration shape when the fault signal is periodic or quasi-periodic. And after the fault location is ascertained, the transient fault forces can be identified by transient residual vibration using simple matrix multiplications and additions. Numerical simulations and experiment on rotor to stator rub are used to test the method, which proved the efficiency of the method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.293-294.475.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Hybrid Model Based Identification of Local Rubbing Fault in Rotor Systems (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 293-294 (Sept. 2005), p. 355-364 
    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 quantitative identification procedure for local rubbing fault in rotor systems based on a hybrid model is proposed. The hybrid model combines finite element model of rotor and rigid discs, online identified oil film stiffness and elastic supports. The identification algorithm of oil film parameters is stated in detail. The hybrid model based diagnosis process for local rubbing fault is described with assumption of periodic rubbing forces. With the help of modal expansion technique, the estimated rubbing forces at each node along rotor are checked for the rubbing position. The estimated rubbing forces at ascertained position are then used in fault severity assessing quantitatively next. These approaches have been tested successfully on a test rig with single rotor double discs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.293-294.355.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Nonlinear Stability and Bifurcation of Multi-D.O.F. Chatter System in Grinding Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 304-305 (Feb. 2006), p. 141-145 
    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: The nonlinear chatter in grinding machine system is discussed analytically in the paper. In higher speed grinding process, the self-excited chatter vibration is mostly induced by the change of grinding speed and grinding wheel shape. Here the grinding machine tool is viewed as a nonlinear multi-D.O.F. autonomous system, in which hysteretic factors of contact surfaces are also introduced. Firstly, the DOFs of the above system are reduced efficiently without changing its dynamic properties by utilizing the center manifold theorem and averaging method. Then, a low dimensional system and corresponding averaging equations are obtained. The stability and bifurcation of chatter system are discussed on the base of deduced averaging equations. It is proved that chatter occurs as a Hopf bifurcation emerging from the steady state at the origin of system. The theoretical analyses on the multi-DOF chattering system will lead to further understanding of the nonlinear mechanisms of higher speed grinding processes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.304-305.141.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Research on Rubbing Fault in a Dual-Disc Overhung Rotor-Bearing System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 977-980 
    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: Mechanical model and rubbing force model of a dual-disc overhung rotor-bearing systemare set up respectively. By using an experiment rig to simulate rubbing fault, the nonlinear dynamiccharacteristics of rubbing rotor system are investigated and the dynamic characteristics of mid-discand overhung disc are analyzed respectively. The numerical simulation results coincide with theexperiment results and the research in this paper has practical reference value to the safe and stablerun of the practical rotating machinery
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.977.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    ANN-Based Crack Identification in Rotor System with Multi-Crack in Shaft (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2463-2466 
    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: Rotating machinery, such as steam turbo, compressor, and aeroengine etc., are widely usedin many industrial fields. Among the important rotor faults, the fatigue crack fault, which can lead tocatastrophic failure and cause injuries and severe damage to machinery if undetected in its earlystages, is most difficult to detect efficiently with traditional methods. In the paper, based on the truthof the change of the mode shapes of the cracked structure, a new method by combining accurate finiteelement model of rotor with multi-crack in shaft and artificial neural network (ANN) is proposed toidentify the location and depth of cracks in rotating machinery. First, based on fracture mechanics andthe energy principle of Paris, the accurate FE model of the rotor system considering several localizedon-edge non-propagating open cracks with different depth, is built to produce the specific modeshapes. Then a set of different mode shapes of a rotor system with localized cracks in several differentpositions and depths, which will be treated as the input of the designed ANN model, can be obtainedby repeating the above step. At last, with several selected crack cases, the errors between the resultsobtained by using the trained ANN model and FEM ones are compared and illustrated. Meanwhile,the influences of crack in the different position on the identification success are analyzed. The methodis validated on the test-rig and proved to have good effectiveness in identification process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2463.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Study on Looseness and Impact - Rub Coupling Faults of a Vertical Dual-Disk Cantilever Rotor- Bearing System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2479-2482 
    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: Because of wrong setting or long-term running of rotating machinery, the looseness mayouur in the bearing seats or bases. And also bring impact and rubbing of rotor-stator, That is thelooseness and rub-impact coupling fault. In the paper,a mechanics model and a finite element modelof a vertical dual-disk cantilever rotor- bearing system with coupling faults of looseness andrub-impact are set up. Based on the nonlinear finite element method and contact theory, thedynamical characteristices of the system under the influence of the looseness rigidity andimpact-rub clearance is studied. The results show that the impact-rub of rotor-stator can reduce thelow frequency vibration caused by looseness, and the impact-rub caused by looseness has obviousorientation. Also, the conclusion of diagnosing the looseness and rub-impact coupling faults isgiven in the end of the paper
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2479.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    First Passage of Uncertain Nonlinear MDOF Systems with Uncorrelated Failure Modes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2545-2548 
    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: The failure analysis of uncertain multi-degree-of-freedom (MDOF) nonlinear vibrationsystems with uncorrelated failure modes subjected to random excitation is examined. An earlierversion of the statistical fourth-moment method is extended to vector-valued and matrix-valuedfunctions and is developed to determine the first four moments of the system response and statefunction. Random variables and system derivatives are conveniently arranged into 2D matrices bymeans of Kronecker products. The distribution function of the system state function isapproximately determined by the standard normal distribution functions using Edgeworth seriestechnique and its failure probability is obtained. The method is based on matrix calculus. Kroneckeralgebra is used in the mathematical development
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2545.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Stability of Two-Span Rotor-Bearing System with Coupling Faults of Crack and Rub-Impact (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2501-2504 
    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 dynamic model was set up for the two-span rotor–bearing system with coupling faultsof crack and rub-impact. Using the continuation-shooting algorithm for periodic solution ofnonlinear non-autonomous system, the stability of the system periodic motion was studied by theFloquet theory. The unstable form of the rotor system with coupling faults is Hopf bifurcation whenthe depth of crack is smaller. The influence to the response of the system increased along with thedepth of crack, the unstable form of the rotor system with coupling faults is period-doublingbifurcation. The conclusions provide theoretic basis reference for the failure diagnosis of the rotorbearingsystem
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2501.pdf
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