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This paper investigates the masking efficiency of a new sound masker named echo-time-reversed masker. The masker is obtained by generating an acoustic echo from the target speech and then processing it with time reversal method. The masking efficiency of the echo-time-reversed masker is evaluated by two objective intelligibility measurements, i. e. the perceptual evaluation of speech quality (PESQ)...
For one-dimensional platform driven by butterfly-shaped linear ultrasonic motor, the Takagi-Sugeno (T-S) models are approached through sector nonlinearity. Based on the T-S models the system augmented method is used for design of servo positioning control algorithm without steady-state error. By considering the robust H∞, a disturbance rejection controller design for the T-S fuzzy models is presented...
To meet the need of advanced manufacturing technology, a piezoelectric actuator with high resolution was developed in this work. The principle of exciting the driving tip to vibrate elliptically was analyzed in detail. A prototype was fabricated to validate the analysis. Testing results shows that this prototype can obtain a speed of 16.6mm/sec in the sinuous exciting voltage signal with peak to peak...
To meet the need of improving requirements for compact actuators in precision driving, a novel linear ultrasonic motor was proposed in this paper. The principle of this motor was introduced. With the help of commercial finite element analysis software ANSYS, finite element model of the stator of the ultrasonic motor was built and mode analysis was conduct to obtain an optimum design. A prototype was...
According to the operating characteristics of ultrasonic motors (USMs), a new position-velocity feedback control strategy is proposed and implemented in a three-joint robot directly driven by USMs. Robust parameter design has been used to obtain an optimal and robust set of PID controller gains. The index of average position error of joints has been reduced to 87.5%. Results show that, the proposed...
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