Investigation of rotary system containing a flexible centrifugal coupling with controlled damping

The possibility of isolation of the driving shaft of the vehicle from vibrations of the engine shaft using a coupling with a controlled damping element based on magnetorheological liquid and a supplemental disc connected to the driving or driven half–coupling is discussed herein. The impact of the parameters of the coupling and the feedback upon the amplitude– frequency response of the system is analyzed. It is demonstrated that effective damping of vibrations in the resonance zone is possibl

Investigation of rotary system containing a flexible centrifugal coupling with controlled damping

The possibility of isolation of the driving shaft of the vehicle from vibrations of the engine shaft using a coupling with a controlled damping element based on magnetorheological liquid and a supplemental disc connected to the driving or driven half–coupling is discussed herein. The impact of the parameters of the coupling and the feedback upon the amplitude– frequency response of the system is analyzed. It is demonstrated that effective damping of vibrations in the resonance zone is possibl

Algorithms and Results of Eye Tissues Differentiation Based on RF Ultrasound

Algorithms and software were developed for analysis of B-scan ultrasonic signals acquired from commercial diagnostic ultrasound system. The algorithms process raw ultrasonic signals in backscattered spectrum domain, which is obtained using two time-frequency methods: short-time Fourier and Hilbert-Huang transformations. The signals from selected regions of eye tissues are characterized by parameters: B-scan envelope amplitude, approximated spectral slope, approximated spectral intercept, mean instantaneous frequency, mean instantaneous bandwidth, and parameters of Nakagami distribution characterizing Hilbert-Huang transformation output. The backscattered ultrasound signal parameters characterizing intraocular and orbit tissues were processed by decision tree data mining algorithm. The pilot trial proved that applied methods are able to correctly classify signals from corpus vitreum blood, extraocular muscle, and orbit tissues. In 26 cases of ocular tissues classification, one error occurred, when tissues were classified into classes of corpus vitreum blood, extraocular muscle, and orbit tissue. In this pilot classification parameters of spectral intercept and Nakagami parameter for instantaneous frequencies distribution of the 1st intrinsic mode function were found specific for corpus vitreum blood, orbit and extraocular muscle tissues. We conclude that ultrasound data should be further collected in clinical database to establish background for decision support system for ocular tissue noninvasive differentiation

Research of parametric vibrations of drive shafts with electric motor

Continuous increase of the rotational speed of the rotating machinery results in the inevitable growth of the dynamic loads and vibration. One of the most efficient way of absorbing vibration in the rotary systems is the application of the resilient couplings. The current paper is concerned with the dynamics of the pendulum-type centrifugal ring elastic coupling. The torque and stiffness characteristics as well as the stability areas of the coupling’s operation are investigated. The compensational properties and effect of the vibration absorption of the coupling are analyze

Research of parametric vibrations of drive shafts with electric motor

Continuous increase of the rotational speed of the rotating machinery results in the inevitable growth of the dynamic loads and vibration. One of the most efficient way of absorbing vibration in the rotary systems is the application of the resilient couplings. The current paper is concerned with the dynamics of the pendulum-type centrifugal ring elastic coupling. The torque and stiffness characteristics as well as the stability areas of the coupling’s operation are investigated. The compensational properties and effect of the vibration absorption of the coupling are analyze

The cientificWorldJOURNAL Research Article Algorithms and Results of Eye Tissues Differentiation Based on RF Ultrasound

Algorithms and software were developed for analysis of B-scan ultrasonic signals acquired from commercial diagnostic ultrasound system. The algorithms process raw ultrasonic signals in backscattered spectrum domain, which is obtained using two timefrequency methods: short-time Fourier and Hilbert-Huang transformations. The signals from selected regions of eye tissues are characterized by parameters: B-scan envelope amplitude, approximated spectral slope, approximated spectral intercept, mean instantaneous frequency, mean instantaneous bandwidth, and parameters of Nakagami distribution characterizing Hilbert-Huang transformation output. The backscattered ultrasound signal parameters characterizing intraocular and orbit tissues were processed by decision tree data mining algorithm. The pilot trial proved that applied methods are able to correctly classify signals from corpus vitreum blood, extraocular muscle, and orbit tissues. In 26 cases of ocular tissues classification, one error occurred, when tissues were classified into classes of corpus vitreum blood, extraocular muscle, and orbit tissue. In this pilot classification parameters of spectral intercept and Nakagami parameter for instantaneous frequencies distribution of the 1st intrinsic mode function were found specific for corpus vitreum blood, orbit and extraocular muscle tissues. We conclude that ultrasound data should be further collected in clinical database to establish background for decision support system for ocular tissue noninvasive differentiation

Electrocardiosignals and Motion Signals Telemonitoring and Analysis System for Sportsmen

The aim of this paper is to present a new electrocardiosignals (ECGs) and motion signals telemonitoring and analysis system for sportsmen paddling a canoe or kayak. The developed system is intended to facilitate the couch in optimizing and individualizing the training of elite athletes. The hardware system consists of rower and coach components. Rower components include 5 sensors for monitoring of mechanical and physiological parameters. The coach components include master unit and laptop computer. The coach software works in two modes: online version during training and off-line the detailed data analysis after training. The new method for systolic blood pressure evaluation was developed and checked for 313 persons. The accuracy of systolic blood pressure prediction could exceed range of 90%.. The preliminary results of developed system testing and method for blood pressure evaluation are promising and show that telemetry system could be used for monitoring of ECG and motion parameters when sportsman is in action. 1