The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Ian M. Hutchings - One of the best experts on this subject based on the ideXlab platform.
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reduction of the sliding friction of metals by the application of Longitudinal or transverse ultrasonic Vibration
Tribology International, 2004Co-Authors: V C Kumar, Ian M. HutchingsAbstract:Abstract The influence on sliding friction of ultrasonic Vibration both parallel and perpendicular to the sliding direction has been studied for samples of aluminium alloy, copper, brass and stainless steel sliding against tool steel. Experiments were performed at a mean sliding speed of 50 mm s −1 , and at mean contact pressures up to 0.7 MPa, with Vibration amplitudes up to 10 μm at 20 kHz. Significant reduction in sliding friction was observed (up to >80%) and good agreement was found between the measured values and the predictions of two simple models for the effects of Longitudinal and transverse Vibrations. Longitudinal Vibration produces greater reduction in friction than transverse Vibration at the same amplitude and frequency. At high Vibration amplitudes, the reduction in friction was less than that predicted by the models, because significant metallic transfer occurred from the softer metals to the tool steel counter surface.
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reduction of the sliding friction of metals by the application of Longitudinal or transverse ultrasonic Vibration
Tribology International, 2004Co-Authors: V C Kumar, Ian M. HutchingsAbstract:Abstract The influence on sliding friction of ultrasonic Vibration both parallel and perpendicular to the sliding direction has been studied for samples of aluminium alloy, copper, brass and stainless steel sliding against tool steel. Experiments were performed at a mean sliding speed of 50 mm s −1 , and at mean contact pressures up to 0.7 MPa, with Vibration amplitudes up to 10 μm at 20 kHz. Significant reduction in sliding friction was observed (up to >80%) and good agreement was found between the measured values and the predictions of two simple models for the effects of Longitudinal and transverse Vibrations. Longitudinal Vibration produces greater reduction in friction than transverse Vibration at the same amplitude and frequency. At high Vibration amplitudes, the reduction in friction was less than that predicted by the models, because significant metallic transfer occurred from the softer metals to the tool steel counter surface.
Weishan Chen - One of the best experts on this subject based on the ideXlab platform.
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a frog shaped linear piezoelectric actuator using first order Longitudinal Vibration mode
IEEE Transactions on Industrial Electronics, 2017Co-Authors: Qiang Zhang, Weishan Chen, Yingxiang Liu, Junkao Liu, Qiang JiangAbstract:A frog-shaped linear piezoelectric actuator was proposed, designed, fabricated, and tested. The proposed actuator only used the first-order Longitudinal Vibration to generate linear motion, which made the design, optimization, and miniaturization of the actuator more flexible by abbreviating the frequency degeneration. By stimulating the first-order Longitudinal Vibration, alternate oblique movements are formed on the ends of two driving feet. Meanwhile, an elongating and shortening movement of the whole actuator is generated. When two parallel walls are in contact with the ends of two diving feet and a vertical preload is applied, the vertical components of the alternate oblique movements will overcome the preload, while the horizontal components of the alternate oblique movements and the elongating and shortening movements will together push the actuator into linear motion. Vibration characteristics and alternate oblique movements of the driving feet were investigated by the finite-element method. Experiment tests of Vibration characteristics and mechanical output ability were then carried out. The tested resonance frequency and Vibration amplitudes agreed well with the calculated ones. The prototype achieved a maximum speed and a thrust of 287 mm/s and 11.8 N, respectively.
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an i shape linear piezoelectric actuator using resonant type Longitudinal Vibration transducers
Mechatronics, 2016Co-Authors: Yingxiang Liu, Weishan Chen, Jipeng Yan, Xiaohui Yang, Xinqi TianAbstract:Abstract Resonant type Longitudinal Vibration transducers are used in this work to construct a linear piezoelectric actuator with four driving feet. Totally three Longitudinal transducers are integrated in I-shape to form the proposed actuator, which contains one vertical transducer and two horizontal transducers. These three transducers vibrate under Longitudinal modes with certain temporal sequence, whose Vibrations are superimposed in the actuator to generate elliptical motions on the four driving feet. The three transducers are tuned to be suitable dimensions, under which they have very close 1st Longitudinal resonance frequencies; the working frequency of the piezoelectric actuator is designed to be about 31.3 kHz. The Vibration coupling problem between the Longitudinal transducers are studied by calculating the motion trajectories of the four feet. It is found that the temporal shift of the Longitudinal Vibrations can be used to tune the movement trajectories; the four feet can get nearly the same vertical displacements under a phase shift of 105°. At last, the Vibration characteristics and mechanical output performances of a prototype are measured. The working frequency of the prototype, the maximum speed, and the maximum thrust force are measured to be 33.15 kHz, 1563 mm/s, and 158.2 N, respectively.
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an electromechanical coupling model of a Longitudinal Vibration type piezoelectric ultrasonic transducer
Ceramics International, 2015Co-Authors: Qiang Zhang, Weishan ChenAbstract:Abstract In this study, an electromechanical coupling model of a Longitudinal Vibration type piezoelectric ultrasonic transducer is derived. The transducer is a langevin type transducer with an exponential horn which can efficiently focus energy to enlarge Vibration amplitude and velocity. Firstly, Vibration model of the transducer is built. Vibration shape and resonance frequency of the transducer is obtained. Secondly, based on the Vibration model, effective electromechanical coupling model is built. Effective electromechanical coupling coefficient is obtained by combining energy method and equivalent circuit method. Furthermore, the influences of PZT ceramics position on effective electromechanical coupling coefficient and resonance frequency are studied, and the regularity of electromechanical coupling coefficient and resonance frequency versus PZT ceramics position is obtained. Meanwhile, the peak value of effective electromechanical coupling coefficient (34.51%) with its corresponding PZT ceramics position (L1=46 mm) are obtained. Around the peak value, five prototype transducers are fabricated and tested to validate the Vibration model and electromechanical coupling model. Vibration shape and resonance frequency are tested with a scanning laser Doppler vibrometer. Electromechanical coupling coefficient is calculated from the testing result of impedance characteristics. At last, comparison between the results of analytical model and experiments are carried out. The comparison indicates that experimental results of resonance frequency and effective electromechanical coupling coefficient are in good agreement with the analytical ones, with the maximum errors 0.673 kHz and 0.83%, separately.
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a rectangle type linear ultrasonic motor using Longitudinal Vibration transducers with four driving feet
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2013Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:To make full use of the Vibrational energy of a Longitudinal transducer, a rectangle-type linear ultrasonic motor with four driving feet is proposed in this paper. This new motor consists of four Longitudinal Vibration transducers which are arranged in a rectangle and form an enclosed construction. Lead zirconate titanate ceramics are embedded into the middle of the transducer and fastened by a wedge-caulking mechanism. Each transducer includes an exponentially shaped horn located on each end. The horns of the vertical transducers intersect at the base of the horizontal transducers' horns; the tip ends of the horizontal transducers' horns are used as the driving feet. Longitudinal Vibrations are superimposed in the motor and generate elliptical movements at the tip ends of the horns. The working principle of the proposed motor is analyzed. The resonance frequencies of two working modes are tuned to be close to each other by adjusting the structural parameters. Transient analysis is developed to gain the Vibration characteristics of the motor. A prototype motor is fabricated and measured. The Vibration test results verify the feasibility of the proposed design. Typical output of the prototype is a no-load speed of 928 mm/s and maximum thrust force of 60 N at a voltage of 200 Vrms.
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a u shaped linear ultrasonic motor using Longitudinal Vibration transducers with double feet
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2012Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:A U-shaped linear ultrasonic motor using Longitudinal Vibration transducers with double feet was proposed in this paper. The proposed motor contains a horizontal transducer and two vertical transducers. The horizontal transducer includes two exponential shape horns located at the leading ends, and each vertical transducer contains one exponential shape horn. The horns of the horizontal transducer and the vertical transducer intersect at the tip ends where the driving feet are located. Longitudinal Vibrations are superimposed in the motor and generate elliptical motions at the driving feet. The two Vibration modes of the motor are discussed, and the motion trajectories of driving feet are deduced. By adjusting the structural parameters, the resonance frequencies of two Vibration modes were degenerated. A prototype motor was fabricated and measured. Typical output of the prototype is no-load speed of 854 mm/s and maximum thrust force of 40 N at a voltage of 200 Vrms.
V C Kumar - One of the best experts on this subject based on the ideXlab platform.
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reduction of the sliding friction of metals by the application of Longitudinal or transverse ultrasonic Vibration
Tribology International, 2004Co-Authors: V C Kumar, Ian M. HutchingsAbstract:Abstract The influence on sliding friction of ultrasonic Vibration both parallel and perpendicular to the sliding direction has been studied for samples of aluminium alloy, copper, brass and stainless steel sliding against tool steel. Experiments were performed at a mean sliding speed of 50 mm s −1 , and at mean contact pressures up to 0.7 MPa, with Vibration amplitudes up to 10 μm at 20 kHz. Significant reduction in sliding friction was observed (up to >80%) and good agreement was found between the measured values and the predictions of two simple models for the effects of Longitudinal and transverse Vibrations. Longitudinal Vibration produces greater reduction in friction than transverse Vibration at the same amplitude and frequency. At high Vibration amplitudes, the reduction in friction was less than that predicted by the models, because significant metallic transfer occurred from the softer metals to the tool steel counter surface.
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reduction of the sliding friction of metals by the application of Longitudinal or transverse ultrasonic Vibration
Tribology International, 2004Co-Authors: V C Kumar, Ian M. HutchingsAbstract:Abstract The influence on sliding friction of ultrasonic Vibration both parallel and perpendicular to the sliding direction has been studied for samples of aluminium alloy, copper, brass and stainless steel sliding against tool steel. Experiments were performed at a mean sliding speed of 50 mm s −1 , and at mean contact pressures up to 0.7 MPa, with Vibration amplitudes up to 10 μm at 20 kHz. Significant reduction in sliding friction was observed (up to >80%) and good agreement was found between the measured values and the predictions of two simple models for the effects of Longitudinal and transverse Vibrations. Longitudinal Vibration produces greater reduction in friction than transverse Vibration at the same amplitude and frequency. At high Vibration amplitudes, the reduction in friction was less than that predicted by the models, because significant metallic transfer occurred from the softer metals to the tool steel counter surface.
Yingxiang Liu - One of the best experts on this subject based on the ideXlab platform.
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a frog shaped linear piezoelectric actuator using first order Longitudinal Vibration mode
IEEE Transactions on Industrial Electronics, 2017Co-Authors: Qiang Zhang, Weishan Chen, Yingxiang Liu, Junkao Liu, Qiang JiangAbstract:A frog-shaped linear piezoelectric actuator was proposed, designed, fabricated, and tested. The proposed actuator only used the first-order Longitudinal Vibration to generate linear motion, which made the design, optimization, and miniaturization of the actuator more flexible by abbreviating the frequency degeneration. By stimulating the first-order Longitudinal Vibration, alternate oblique movements are formed on the ends of two driving feet. Meanwhile, an elongating and shortening movement of the whole actuator is generated. When two parallel walls are in contact with the ends of two diving feet and a vertical preload is applied, the vertical components of the alternate oblique movements will overcome the preload, while the horizontal components of the alternate oblique movements and the elongating and shortening movements will together push the actuator into linear motion. Vibration characteristics and alternate oblique movements of the driving feet were investigated by the finite-element method. Experiment tests of Vibration characteristics and mechanical output ability were then carried out. The tested resonance frequency and Vibration amplitudes agreed well with the calculated ones. The prototype achieved a maximum speed and a thrust of 287 mm/s and 11.8 N, respectively.
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an i shape linear piezoelectric actuator using resonant type Longitudinal Vibration transducers
Mechatronics, 2016Co-Authors: Yingxiang Liu, Weishan Chen, Jipeng Yan, Xiaohui Yang, Xinqi TianAbstract:Abstract Resonant type Longitudinal Vibration transducers are used in this work to construct a linear piezoelectric actuator with four driving feet. Totally three Longitudinal transducers are integrated in I-shape to form the proposed actuator, which contains one vertical transducer and two horizontal transducers. These three transducers vibrate under Longitudinal modes with certain temporal sequence, whose Vibrations are superimposed in the actuator to generate elliptical motions on the four driving feet. The three transducers are tuned to be suitable dimensions, under which they have very close 1st Longitudinal resonance frequencies; the working frequency of the piezoelectric actuator is designed to be about 31.3 kHz. The Vibration coupling problem between the Longitudinal transducers are studied by calculating the motion trajectories of the four feet. It is found that the temporal shift of the Longitudinal Vibrations can be used to tune the movement trajectories; the four feet can get nearly the same vertical displacements under a phase shift of 105°. At last, the Vibration characteristics and mechanical output performances of a prototype are measured. The working frequency of the prototype, the maximum speed, and the maximum thrust force are measured to be 33.15 kHz, 1563 mm/s, and 158.2 N, respectively.
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a rectangle type linear ultrasonic motor using Longitudinal Vibration transducers with four driving feet
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2013Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:To make full use of the Vibrational energy of a Longitudinal transducer, a rectangle-type linear ultrasonic motor with four driving feet is proposed in this paper. This new motor consists of four Longitudinal Vibration transducers which are arranged in a rectangle and form an enclosed construction. Lead zirconate titanate ceramics are embedded into the middle of the transducer and fastened by a wedge-caulking mechanism. Each transducer includes an exponentially shaped horn located on each end. The horns of the vertical transducers intersect at the base of the horizontal transducers' horns; the tip ends of the horizontal transducers' horns are used as the driving feet. Longitudinal Vibrations are superimposed in the motor and generate elliptical movements at the tip ends of the horns. The working principle of the proposed motor is analyzed. The resonance frequencies of two working modes are tuned to be close to each other by adjusting the structural parameters. Transient analysis is developed to gain the Vibration characteristics of the motor. A prototype motor is fabricated and measured. The Vibration test results verify the feasibility of the proposed design. Typical output of the prototype is a no-load speed of 928 mm/s and maximum thrust force of 60 N at a voltage of 200 Vrms.
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a u shaped linear ultrasonic motor using Longitudinal Vibration transducers with double feet
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2012Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:A U-shaped linear ultrasonic motor using Longitudinal Vibration transducers with double feet was proposed in this paper. The proposed motor contains a horizontal transducer and two vertical transducers. The horizontal transducer includes two exponential shape horns located at the leading ends, and each vertical transducer contains one exponential shape horn. The horns of the horizontal transducer and the vertical transducer intersect at the tip ends where the driving feet are located. Longitudinal Vibrations are superimposed in the motor and generate elliptical motions at the driving feet. The two Vibration modes of the motor are discussed, and the motion trajectories of driving feet are deduced. By adjusting the structural parameters, the resonance frequencies of two Vibration modes were degenerated. A prototype motor was fabricated and measured. Typical output of the prototype is no-load speed of 854 mm/s and maximum thrust force of 40 N at a voltage of 200 Vrms.
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a cylindrical traveling wave ultrasonic motor using Longitudinal Vibration transducers
Ferroelectrics, 2010Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:A cylindrical type traveling wave ultrasonic motor using Longitudinal Vibration transducers is proposed in this paper. A flexural traveling wave is excited in the cylinder by the Longitudinal Vibrations of transducers. The working principle of proposed motor is analyzed. The function of flexural traveling wave and motion trajectory of particle on the tooth are developed. The Longitudinal resonant frequency of transducer and bending resonant frequency of cylinder are degenerated. A prototype motor is fabricated and measured. Typical output of the prototype is no-load speed of 290r/min and maximum torque of 1.95N·m at a voltage of 200Vrms.
Junkao Liu - One of the best experts on this subject based on the ideXlab platform.
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a frog shaped linear piezoelectric actuator using first order Longitudinal Vibration mode
IEEE Transactions on Industrial Electronics, 2017Co-Authors: Qiang Zhang, Weishan Chen, Yingxiang Liu, Junkao Liu, Qiang JiangAbstract:A frog-shaped linear piezoelectric actuator was proposed, designed, fabricated, and tested. The proposed actuator only used the first-order Longitudinal Vibration to generate linear motion, which made the design, optimization, and miniaturization of the actuator more flexible by abbreviating the frequency degeneration. By stimulating the first-order Longitudinal Vibration, alternate oblique movements are formed on the ends of two driving feet. Meanwhile, an elongating and shortening movement of the whole actuator is generated. When two parallel walls are in contact with the ends of two diving feet and a vertical preload is applied, the vertical components of the alternate oblique movements will overcome the preload, while the horizontal components of the alternate oblique movements and the elongating and shortening movements will together push the actuator into linear motion. Vibration characteristics and alternate oblique movements of the driving feet were investigated by the finite-element method. Experiment tests of Vibration characteristics and mechanical output ability were then carried out. The tested resonance frequency and Vibration amplitudes agreed well with the calculated ones. The prototype achieved a maximum speed and a thrust of 287 mm/s and 11.8 N, respectively.
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a rectangle type linear ultrasonic motor using Longitudinal Vibration transducers with four driving feet
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2013Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:To make full use of the Vibrational energy of a Longitudinal transducer, a rectangle-type linear ultrasonic motor with four driving feet is proposed in this paper. This new motor consists of four Longitudinal Vibration transducers which are arranged in a rectangle and form an enclosed construction. Lead zirconate titanate ceramics are embedded into the middle of the transducer and fastened by a wedge-caulking mechanism. Each transducer includes an exponentially shaped horn located on each end. The horns of the vertical transducers intersect at the base of the horizontal transducers' horns; the tip ends of the horizontal transducers' horns are used as the driving feet. Longitudinal Vibrations are superimposed in the motor and generate elliptical movements at the tip ends of the horns. The working principle of the proposed motor is analyzed. The resonance frequencies of two working modes are tuned to be close to each other by adjusting the structural parameters. Transient analysis is developed to gain the Vibration characteristics of the motor. A prototype motor is fabricated and measured. The Vibration test results verify the feasibility of the proposed design. Typical output of the prototype is a no-load speed of 928 mm/s and maximum thrust force of 60 N at a voltage of 200 Vrms.
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a u shaped linear ultrasonic motor using Longitudinal Vibration transducers with double feet
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2012Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:A U-shaped linear ultrasonic motor using Longitudinal Vibration transducers with double feet was proposed in this paper. The proposed motor contains a horizontal transducer and two vertical transducers. The horizontal transducer includes two exponential shape horns located at the leading ends, and each vertical transducer contains one exponential shape horn. The horns of the horizontal transducer and the vertical transducer intersect at the tip ends where the driving feet are located. Longitudinal Vibrations are superimposed in the motor and generate elliptical motions at the driving feet. The two Vibration modes of the motor are discussed, and the motion trajectories of driving feet are deduced. By adjusting the structural parameters, the resonance frequencies of two Vibration modes were degenerated. A prototype motor was fabricated and measured. Typical output of the prototype is no-load speed of 854 mm/s and maximum thrust force of 40 N at a voltage of 200 Vrms.
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a cylindrical traveling wave ultrasonic motor using Longitudinal Vibration transducers
Ferroelectrics, 2010Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:A cylindrical type traveling wave ultrasonic motor using Longitudinal Vibration transducers is proposed in this paper. A flexural traveling wave is excited in the cylinder by the Longitudinal Vibrations of transducers. The working principle of proposed motor is analyzed. The function of flexural traveling wave and motion trajectory of particle on the tooth are developed. The Longitudinal resonant frequency of transducer and bending resonant frequency of cylinder are degenerated. A prototype motor is fabricated and measured. Typical output of the prototype is no-load speed of 290r/min and maximum torque of 1.95N·m at a voltage of 200Vrms.
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a high power linear ultrasonic motor using Longitudinal Vibration transducers with single foot
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 2010Co-Authors: Yingxiang Liu, Weishan Chen, Junkao Liu, Shengjun ShiAbstract:A high-power linear ultrasonic motor using Longitudinal Vibration transducers with single foot was proposed in this paper. The stator of proposed motor contains a horizontal transducer and a vertical transducer. Longitudinal Vibrations are superimposed in the stator and generate an elliptical trajectory at the driving foot. The sensitivity analysis of structural parameters to the resonance frequencies of two working modes of the stator was performed using the finite element method. The resonance frequencies of two working modes were degenerated by adjusting the structural parameters. The Vibration characteristics of stator were studied and discussed. A prototype motor was fabricated and measured. Typical output of the prototype is a no-load speed of 1160 mm/s and maximum thrust force of 20 N at a voltage of 200 Vrms.
