The Experts below are selected from a list of 153 Experts worldwide ranked by ideXlab platform
Zhihua Feng - One of the best experts on this subject based on the ideXlab platform.
-
resonant type inertia linear motor based on the harmonic vibration synthesis of piezoelectric bending actuator
Sensors and Actuators A-physical, 2014Co-Authors: Qiaosheng Pan, Chengliang Pan, Guang Jun Xiao, Zhihua FengAbstract:Abstract Traditional piezoelectric inertia motors are generally driven at the quasi-static frequency range, which results in a relatively slow moving speed. In this paper, a piezoelectric bending actuator was designed for a resonant-type inertia linear motor. The driving mechanism of the actuator was also studied. The actuator's movement in a periodical sawtooth-shaped waveform was generated by composing two sinusoidal resonant bending vibrations with a frequency ratio of 1:2. A prototype inertia motor was fabricated. Experimental results confirmed the effectiveness of the design. The no-Load maximum speed was 28.2 mm/s with drive voltage of 300 V p–p for a base frequency of 587 Hz. At a preLoad force of 9.6 N and a driving voltage of 400 V p–p for the base frequency, the linear speed was 18.5 mm/s with 0.02 N Drag Load. The moving direction could be reversed by changing the driving voltage's phase.
Chengliang Pan - One of the best experts on this subject based on the ideXlab platform.
-
resonant type inertia linear motor based on the harmonic vibration synthesis of piezoelectric bending actuator
Sensors and Actuators A-physical, 2014Co-Authors: Qiaosheng Pan, Chengliang Pan, Guang Jun Xiao, Zhihua FengAbstract:Abstract Traditional piezoelectric inertia motors are generally driven at the quasi-static frequency range, which results in a relatively slow moving speed. In this paper, a piezoelectric bending actuator was designed for a resonant-type inertia linear motor. The driving mechanism of the actuator was also studied. The actuator's movement in a periodical sawtooth-shaped waveform was generated by composing two sinusoidal resonant bending vibrations with a frequency ratio of 1:2. A prototype inertia motor was fabricated. Experimental results confirmed the effectiveness of the design. The no-Load maximum speed was 28.2 mm/s with drive voltage of 300 V p–p for a base frequency of 587 Hz. At a preLoad force of 9.6 N and a driving voltage of 400 V p–p for the base frequency, the linear speed was 18.5 mm/s with 0.02 N Drag Load. The moving direction could be reversed by changing the driving voltage's phase.
Qiaosheng Pan - One of the best experts on this subject based on the ideXlab platform.
-
resonant type piezoelectric inertial linear motor based on the optimization of a dual stage tuning fork transducer
Review of Scientific Instruments, 2018Co-Authors: Qiaosheng Pan, Kailun Wang, Enming Miao, Shuangbao Shu, Xiujun LeiAbstract:A dual stage tuning fork transducer (DSTFT) is designed as a stator for a resonant-type inertial linear motor. The first- and second-layer resonant frequencies of DSTFT are automatically adjusted with a ratio of 1:2 by using an ANSYS optimization design algorithm, and a resonant-type sawtooth-shaped mechanical waveform is generated by composing the two resonant vibrations of DSTFT. An inertial linear motor prototype is fabricated and tested. Experimental results confirmed the effectiveness of the designed transducer. The no-Load maximum speed is 21.5 mm/s with a driving voltage of 67.2 Vp-p at a base frequency of 2831 Hz. The linear speed is 10.5 mm/s, and the Drag Load is 0.02 N at a preLoad force of 1 N and a driving voltage of 114 Vp-p for the base frequency. The movement direction could be reversed by changing the driving voltage phase.
-
resonant type inertia linear motor based on the harmonic vibration synthesis of piezoelectric bending actuator
Sensors and Actuators A-physical, 2014Co-Authors: Qiaosheng Pan, Chengliang Pan, Guang Jun Xiao, Zhihua FengAbstract:Abstract Traditional piezoelectric inertia motors are generally driven at the quasi-static frequency range, which results in a relatively slow moving speed. In this paper, a piezoelectric bending actuator was designed for a resonant-type inertia linear motor. The driving mechanism of the actuator was also studied. The actuator's movement in a periodical sawtooth-shaped waveform was generated by composing two sinusoidal resonant bending vibrations with a frequency ratio of 1:2. A prototype inertia motor was fabricated. Experimental results confirmed the effectiveness of the design. The no-Load maximum speed was 28.2 mm/s with drive voltage of 300 V p–p for a base frequency of 587 Hz. At a preLoad force of 9.6 N and a driving voltage of 400 V p–p for the base frequency, the linear speed was 18.5 mm/s with 0.02 N Drag Load. The moving direction could be reversed by changing the driving voltage's phase.
Wun-tao Wei - One of the best experts on this subject based on the ideXlab platform.
-
Numerical investigation of pile-head Load effects on the negative skin friction development of a single pile in consolidating ground
Acta Geotechnica, 2021Co-Authors: Jiunn-shyang Chiou, Wun-tao WeiAbstract:This study conducted parametric analyses to investigate the influence of structural Loading (pile-head Loading) on the development of negative skin friction in friction single piles and friction-end-bearing single piles in consolidating ground. Numerical effective stress-based mechanical-flow analysis models were built in ABAQUS software. The appropriateness of the modeling approach was verified by applying it to simulate a field model test described in the literature. For small surcharges, pile-head Loading considerably reduces the depth of the neutral plane and therefore Drag Load for the friction pile. Under the same pile-head Loads, the reduction in total Drag Load for the friction-end-bearing pile is smaller than that for the friction pile. However, when the friction-end-bearing pile is subjected to larger pile-head Loads, the degree of total Drag Load reduction is comparable to that of the friction pile. Considerable pile-head displacement occurs under the combined action of pile-head and surcharge Loadings. In contrast to the friction pile, the friction-end-bearing pile, because of the greater stiffness and strength of its bearing stratum, exhibits a significant reduction in negative skin friction, no bearing failure, and a smaller pile-head displacement when it is subjected to large pile-head Loading.
Y. C. Kog - One of the best experts on this subject based on the ideXlab platform.
-
Delayed installation of piles in consolidating soil
Soils and Foundations, 2019Co-Authors: Y. C. KogAbstract:Abstract The current general accepted view is that the delayed installation of piles after the commencement of consolidation leads to a reduction of Drag Load acting on piles. Despite the extensive studies reported in the literature, no work that focussed on the quantitative effect of delayed installation of piles after the commencement of the consolidation on pile behavior was reported. A study on the effect of the delayed pile installation after the commencement of the consolidation is undertaken using a Load transfer theory. Pile-soil slip is accounted for by limiting shear stress at the pile-soil interface to the average undrained shear strength of the consolidating soil. The effect of pile-soil slip in limiting the Drag Load is accounted for once the location of the neutral plane resulting from the delayed pile installation after the commencement of the consolidation is known. Contrary to the current generally accepted understanding that delayed installation of piles after the commencement of the consolidation will lead to a reduction of Drag Load on such piles, the present study finds that the Drag Load on piles may not be reduced for consolidating soft clay with two ways drainage or one way bottom drainage conditions.
-
Centrifuge tests of axially Loaded piles in consolidating soil
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2016Co-Authors: Y. C. KogAbstract:Axially Loaded piles installed in layered soils where the upper soil layer is still consolidating are subjected to the combined interactive action of axial Load and Drag Load. The shift of the location of the neutral plane as a result of the interaction of the axial Load and Drag Load leads to the possibility that such piles need not account for the negative skin friction in determining the maximum pile force for the pile structural design. The results of a series of centrifuge tests on axially Loaded piles in consolidating layered soil are presented so that the effect of negative skin friction on pile settlements and locations of the neutral plane of such piles can be better understood. The criteria regarding whether negative skin friction needs to be accounted for in determining the maximum pile force for the pile structural design are established in the present study based on centrifuge test results and findings reported in the literature.
-
Axially Loaded Piles in Consolidating Layered Soil
International Journal of Geomechanics, 2016Co-Authors: Y. C. KogAbstract:AbstractThe interaction of an applied axial Load and a Drag Load on a circular pile in consolidating layered soil is investigated. A rigorous Load-transfer theory with elastoplastic slip considered at the pile–soil interface for such piles is developed. The validity of the proposed solution is confirmed by a comparison with field measurements. Results of extensive parametric studies with regard to the pile behavior are presented for a better understanding of the behavior for axially Loaded piles embedded in layered soil with an upper consolidating layer. Design charts are presented to predict the location of the neutral plane, maximum pile Load, and pile top settlement for axially Loaded piles in layered consolidating soils.