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  • 1
    Electronic Resource
    Electronic Resource
    Vibration Damping of Automotive Driveshafts with Piezofiber Composite Structures (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 222-225 
    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 presents a solution of the vibration reduction in driving automotive shafts.Generally, vibration modes in automotive driveshafts are divided into the bending and torsionalvibrations. However, the bending vibration is more dominant factor when it excites with theresonance frequencies in automotive driveshafts. In this paper, the vibration damping structure ofautomotive driveshaft is introduced by incorporating piezofiber composite structure, which is alsocalled as MFC (Macro Fiber Composite). The MFC is an innovative actuator that offers highperformance and flexibility than other piezo-materials, so it is the best candidate of actuator to applyto the curved surface of shaft. In order to simulate the bending vibration reduction in the automotiveshaft, analytical model based on cylindrical shell theory was developed. Moreover, Finite ElementAnalysis (FEA) using the piezoelectric-thermal analogy technique was conducted to confirm theanalytical results and demonstrate the vibration reduction performance. The effect by the polarity ofMFC on the vibration damping is also studied to find the best combination of MFC activation. Thus,the results showcase the optimal vibration damping capabilities using MFC in automotive driveshafts,and provide an outlook for the active damping control using the multi-mode resonance controllers
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.222.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Active Vibration Control of Smart Hull Structure Using Piezoelectric Composite Actuators (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 137-140 
    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 this paper, active vibration control performance of the smart hull structure withMacro-Fiber Composite (MFC) is evaluated. The governing equations of motion of the hull structurewith MFC actuators are derived based on the classical Donnell-Mushtari shell theory. Subsequently,modal characteristics are investigated and compared with the results obtained from finite elementanalysis and experiment. The governing equations of vibration control system are then establishedand expressed in the state space form. Linear Quadratic Gaussian (LQG) control algorithm isdesigned in order to effectively and actively control the imposed vibration. The controller isexperimentally realized and control performances are evaluated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.137.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Design and Control of Magnetorheological Fluid-Based Multifunctional Haptic Device for Vehicle Applications (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 141-144 
    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 presents control performances of a magnetorheological (MR) fluid-basedmultifunctional haptic device which is applicable to realization of in-vehicle comfort functions. Bycombining the functions into a single device, the proposed haptic device can transmit variousreflection forces for each comfort function to a driver without requiring the driver’s visual attention.As a multifunctional haptic device, a MR knob is proposed in this work and devised to be capable ofboth rotary and push motions with a single knob. Based on the optimally determined designparameters to maximize a control torque, the proposed haptic device is manufactured. And in-vehiclecomfort functions are constructed in virtual environment which makes the functions to communicatewith the haptic device. Subsequently, a feed-forward controller using torque/force maps is formulatedfor the force tracking control. Control performances such as reflection force of the haptic device areexperimentally evaluated via the torque/force map-based feed-forward controller
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.141.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Damping Force Control of MR Damper for a Passenger Vehicle Considering Hysteretic Compensator (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 145-148 
    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 presents damping force control performances of a magnetorheological (MR)damper via new control strategy considering hysteretic behavior of the field-dependent dampingforce. In order to achieve this goal, a commercial MR damper which is applicable to passenger vehicleis adopted and its field-dependent damping force is experimentally evaluated. Since thefield-dependent damping force shows the hysteretic behavior which significantly affects to controlcharacteristics of the system, Preisach hysteresis model for the MR damper is established and its firstorder descending (FOD) curves are experimentally identified. Subsequently, a feed-forwardcompensator strategy for the MR damper is formulated and damping force control is evaluated. Inaddition, vibration control performances are experimentally evaluated with quarter-vehicle testfacility
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.145.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Stick-Slip Compensation of Micro-Positioning Using Elastic-Plastic Static Friction Model (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 246-249 
    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 this paper, a stick-slip compensation for the micro-positioning is presented using thestatistical rough surface contact model. As for the micro-positioning structure, PZT (lead(Pb)zirconia(Zr) Titanate(Ti)) actuator is used to drive the load for precise positioning with its highresolution incorporating with the PID (Proportional Integral Derivative) control algorithm. Since thestick-slip characteristics for the micro structures are highly nonlinear and complicated, it is necessaryto incorporate more detailed stick-slip model for the applications involving the high precision motioncontrol. Thus, the elastic-plastic static friction model is used for the stick-slip compensationconsidering the elastic-plastic asperity contact in the rough surfaces statistically. Mathematical modelof the system for the positioning apparatus was derived from the dynamic behaviors of structural parts.Since the conventional piezoelectric actuator generates the short stroke, a bridge-type flexural hingemechanism is introduced to amplify the linear motion range. Using the proposed smart structure,simulations under the representative positioning motion were conducted to demonstrate themicro-positioning under the stick-slip friction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.246.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental Investigation of Smart Hull Structures Based on Macro Fiber Composite Actuators (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1419-1422 
    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: In the present paper, the dynamic characteristics of smart hull structure are investigatedfor the feasibility of Macro Fiber Composite (MFC) actuator in active vibration control of smarthull structure. MFC is an advanced anisotropic piezoceramic actuator. Finite element technique wasused to ensure application to practical geometry and boundary conditions of smart hull structure.Using finite element method, modal analysis and strain distribution were first conducted toinvestigate dynamic characteristics of smart hull structure. Based on numerical modal analysis, thelocations of MFC actuators are determined to achieve maximum control authority. Then, the MFCactuators are attached to the hull structure and natural frequencies and damping coefficients areidentified through experimental modal test
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1419.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fatigue Properties of Smart Electrorheological Materials (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1172-1177 
    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: In this study, both mechanical and electrical fatigue properties of electrorheological (ER) materials whose global characteristics can be controlled by an external electric field are experimentally evaluated. In order to investigate the mechanical fatigue property, a linear reciprocating apparatus is devised and operated by the hydraulic unit. Two important characteristics of methylcellulose based ER material: the field-dependent yield stress and current density are investigated as a function of the operating cycle. The electrical fatigue property is investigated by applying high voltage to the ER material domain through the electrode gap. The voltage is imposed in on-off manner for the specific cycles by changing the field intensity. The yield stress and current density of the ER material are evaluated at each specified cycle and surface roughness of the electrode is observed as well
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.1172.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Tensile and Compressive Behaviors of Smart Electrorheological Materials (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 646-652 
    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 presents experimental results of tensile and compressive behaviors of smart electrorheological (ER) materials. Two different ER materials ; chemically treated starch particles and polymethylaniline particles are synthesized followed by devising a sqreeze mode type apparatus associated with motion controller and data acquisition system. The field intensity, electrode velocity and initial gap are chosen as important test parameters that influence on the tensile and compressive characteristics. The maximum tensile stresses are evaluated at each condition and compared between two ER materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.646.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    On the Study of Effective Breadth for Stiffened Plate under Flexible Support Condition (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2375-2381 
    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 effective breadth of a stiffened plate under bending was investigated. The design parameter of an effective breadth was used when a stiffened plate subjected to a lateral loading was considered. Due to the lateral loads there was shear transmission through the plate from the stiffener, which leads to a non-uniform longitudinal stress distribution across the plate width the effective breadth that takes into account a shear lag can be calculated by the simple beam theory. For a tanker,the existing effective breadth concept has been used when longitudinal stiffeners are fixed at adjacent web frames. However, the effective breadth of each classification’s formula can’t be applied to flexible support condition such as the one prevailing in Ro-Ro vessel. The effective breadth according to the rules of several classification societies was compared and a way to get an accurateanalysis as suggested
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2375.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Vibration Control of Smart Structures Using Piezofilm Actuators (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1205-1210 
    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 presents vibration control of a flexible smart beam structure using a newdiscrete-time sliding mode controller. After formulating the dynamic model in the space representation, so called the separation principle for equivalent controller is established so that the sliding mode conditions are satisfied. By doing this, undesirable chattering of the flexible structures can be attenuated in the settled phase. In order to demonstrate some benefits of the proposed methodology, an experimental realization is undertaken. Both transient and forced vibration controlresponses are evaluated in time domain and compared between with and without the separation principle
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1205.pdf
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