The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Xiaoming Wang - One of the best experts on this subject based on the ideXlab platform.
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Sinusoidal Vibration Test Control of a Switching Mode Power Amplifier -Fed Electrodynamic Shaker
2006 1ST IEEE Conference on Industrial Electronics and Applications, 2006Co-Authors: Tianhao Tang, Xiaoming WangAbstract:This paper presents a digital acceleration controller for Sinusoidal tests using switching mode power amplifier (SMPA). The proposed method is based on two control loops: one for the shaker's acceleration control and another for the SMPA output voltage control. A simple and efficient voltage-controlled method is used in the SMPA. The acceleration controller consists of feedback controller, a feedforward controller and a robust disturbance feedforward controller. Experiments show that the proposed system is capable to achieve excellent acceleration and robustness in the closed loop control from 20 Hz to 200 Hz
Qian Zhang - One of the best experts on this subject based on the ideXlab platform.
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Modeling and Robust Control of Web Winding System with Sinusoidal Tension Disturbance
2006 International Conference on Mechatronics and Automation, 2006Co-Authors: Yulin Xu, Dongyun Wang, Qian ZhangAbstract:The nonlinear model of a flexible web winding system composed of three motors and two load cells is derived based on the general laws of physics. The model parameters are identified using optimization methods. Robust controller is designed to obtain good reference tracking properties as well as to properly reject Sinusoidal disturbance for suppressing Vibrations. The proposed approach is based on the frequency weighting functions which give an extended model to design a stabilizing Hinfin controller. The method is applied to the flexible web winding system to compensate the web tension disturbance caused by the Sinusoidal Vibration on winder
Hiroyuki Kajimoto - One of the best experts on this subject based on the ideXlab platform.
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Combination of cathodic electrical stimulation and mechanical damped Sinusoidal Vibration to express tactile softness in the tapping process
2018 IEEE Haptics Symposium (HAPTICS), 2018Co-Authors: Hiroyuki KajimotoAbstract:A damped Sinusoidal Vibration is generally used to reproduce the sensation of tapping. However, the type of actuator generally used in the field of tactile display cannot produce very low-frequency Vibrations, and thus cannot activate Merkel cells to produce the sensation of cutaneous pressure. In this study we propose a method that combines cathodic electrical stimulation, which produces a pressure-like sensation, with a mechanical damped Sinusoidal Vibration. Our experiment demonstrated that the cutaneous pressure sensation produced by cathodic electrical stimulation mostly affects the perception of softness, allowing our method to reproduce sensations of softness/hardness over a wider range than when using mechanical Vibration alone. Most participants felt that the combination of these two stimulations provided a more realistic tapping sensation.
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HAPTICS - Combination of cathodic electrical stimulation and mechanical damped Sinusoidal Vibration to express tactile softness in the tapping process
2018 IEEE Haptics Symposium (HAPTICS), 2018Co-Authors: Hiroyuki KajimotoAbstract:A damped Sinusoidal Vibration is generally used to reproduce the sensation of tapping. However, the type of actuator generally used in the field of tactile display cannot produce very low-frequency Vibrations, and thus cannot activate Merkel cells to produce the sensation of cutaneous pressure. In this study we propose a method that combines cathodic electrical stimulation, which produces a pressure-like sensation, with a mechanical damped Sinusoidal Vibration. Our experiment demonstrated that the cutaneous pressure sensation produced by cathodic electrical stimulation mostly affects the perception of softness, allowing our method to reproduce sensations of softness/hardness over a wider range than when using mechanical Vibration alone. Most participants felt that the combination of these two stimulations provided a more realistic tapping sensation.
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Visual Vibrations to Simulate Taps on Different Materials
2015Co-Authors: Taku Hachisu, Gabriel Cirio, Maud Marchal, Anatole Lecuyer, Hiroyuki KajimotoAbstract:This paper presents a haptic visualization technique for conveying material type through visual feedback, expressed as visible decaying Sinusoidal Vibration resulting from tapping an object. The technique employs cartoon-inspired visual effects and modulates the scale of the Vibration to comply with visual perception. The results of a user study show that participants could successfully perceive three types of material (rubber, wood, and aluminum) using our novel visual effect.
Leon E Kazarian - One of the best experts on this subject based on the ideXlab platform.
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the effects of acceleration on the mechanical impedance response of a primate model exposed to Sinusoidal Vibration
Annals of Biomedical Engineering, 1994Co-Authors: Suzanne D Smith, Leon E KazarianAbstract:Criteria for developing active and passive isolation mechanisms for reducing the effects of whole-body Vibration exposure rely on a thorough understanding of the stiffness, damping, and resonance behaviors of the human or human surrogate body. Three Rhesus monkeys were exposed to seated whole-body Sinusoidal Vibration between 3 and 20 Hz at 0.69 and 3.47 msec−2 rms (0.1 and 0.5 g peak) accelerations. The mechanical impedance magnitude and phase were calculated as the ratio and phase relation between the transmitted force and input velocity, respectively, at the seat. The resultant profiles showed a significant decrease in the primary resonance frequency with increasing acceleration. At the lower acceleration level, a second lower impedance peak was observed at approximately 5 Hz. A three-mass, two degree-of-freedom model, which included upper torso and leg representation, was used to determine the mechanical parameters that best described the measured responses. The mean stiffness coefficients and the mean undamped natural frequencies associated with the upper torso and leg subsystems showed a significant decrease with increases in the acceleration level. The results of this study strongly suggested that nonlinear stiffness properties were responsible for the observed differences in the biodynamic response of the Rhesus monkey with acceleration level.
Yangkyu Choi - One of the best experts on this subject based on the ideXlab platform.
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floating oscillator embedded triboelectric generator for versatile mechanical energy harvesting
Scientific Reports, 2015Co-Authors: Myeonglok Seol, Jinwoo Han, Seungbae Jeon, M Meyyappan, Yangkyu ChoiAbstract:A versatile Vibration energy harvesting platform based on a triboelectricity is proposed and analyzed. External mechanical Vibration repeats an oscillating motion of a polymer-coated metal oscillator floating inside a surrounding tube. Continuous sidewall friction at the contact interface of the oscillator induces current between the inner oscillator electrode and the outer tube electrode to convert mechanical Vibrations into electrical energy. The floating oscillator-embedded triboelectric generator (FO-TEG) is applicable for both impulse excitation and Sinusoidal Vibration which universally exist in usual environment. For the impulse excitation, the generated current sustains and slowly decays by the residual oscillation of the floating oscillator. For the Sinusoidal Vibration, the output energy can be maximized by resonance oscillation. The operating frequency range can be simply optimized with high degree of freedom to satisfy various application requirements. In addition, the excellent immunity against ambient humidity is experimentally demonstrated, which stems from the inherently packaged structure of FO-TEG. The prototype device provides a peak-to-peak open-circuit voltage of 157 V and instantaneous short-circuit current of 4.6 μA, within sub-10 Hz of operating frequency. To visually demonstrate the energy harvesting behavior of FO-TEG, lighting of an array of LEDs is demonstrated using artificial Vibration and human running.