The Experts below are selected from a list of 20442 Experts worldwide ranked by ideXlab platform
Meng Yin Fu - One of the best experts on this subject based on the ideXlab platform.
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research on the signal process of a bell shaped Vibratory angular rate gyro
Sensors, 2014Co-Authors: Zhong Su, Qing Li, Meng Yin FuAbstract:A bell-shaped Vibratory angular rate gyro, which is inspired by the Chinese traditional bell, is a kind of axisymmetric shell resonator gyroscope. Its sensitive element is a Vibratory-like Chinese traditional bell, using a piezoelectric element on the wall of the Vibrator to detect the standing wave’s precession to solve the input angular rate. This work mainly studies the circuit system of a bell-shaped Vibratory angular rate gyro. It discusses the process of circuit system design, analysis and experiment, in detail, providing the foundation to develop a bell-shaped Vibratory angular rate gyro. Since the bell-shaped resonator’s curved structure has the characteristics of large noise in the piezoelectric signal and large harmonics, this paper analyzes its working and signal detection method, then gives the whole plan of the circuit system, including the drive module, the detection module and the control loop. It also studies every part of the whole system, gives a detailed design and analysis process and proves part of the circuit system using digital simulation. At the end of the article, the test result of the circuit system shows that it can remove the disadvantages of the curved structure having large noise in the piezoelectric signal and large harmonics and is more effective at solving the input angular rate.
Zhong Su - One of the best experts on this subject based on the ideXlab platform.
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research on the signal process of a bell shaped Vibratory angular rate gyro
Sensors, 2014Co-Authors: Zhong Su, Qing Li, Meng Yin FuAbstract:A bell-shaped Vibratory angular rate gyro, which is inspired by the Chinese traditional bell, is a kind of axisymmetric shell resonator gyroscope. Its sensitive element is a Vibratory-like Chinese traditional bell, using a piezoelectric element on the wall of the Vibrator to detect the standing wave’s precession to solve the input angular rate. This work mainly studies the circuit system of a bell-shaped Vibratory angular rate gyro. It discusses the process of circuit system design, analysis and experiment, in detail, providing the foundation to develop a bell-shaped Vibratory angular rate gyro. Since the bell-shaped resonator’s curved structure has the characteristics of large noise in the piezoelectric signal and large harmonics, this paper analyzes its working and signal detection method, then gives the whole plan of the circuit system, including the drive module, the detection module and the control loop. It also studies every part of the whole system, gives a detailed design and analysis process and proves part of the circuit system using digital simulation. At the end of the article, the test result of the circuit system shows that it can remove the disadvantages of the curved structure having large noise in the piezoelectric signal and large harmonics and is more effective at solving the input angular rate.
Haim Sohmer - One of the best experts on this subject based on the ideXlab platform.
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bone conduction experiments in animals evidence for a non osseous mechanism
Hearing Research, 2000Co-Authors: Sharon Freeman, Jeanyves Sichel, Haim SohmerAbstract:Abstract Bone conducted stimuli are used to differentiate between conductive and sensori-neural hearing loss. It has been thought that the main route for the transfer of Vibratory energy from the point of application of the bone Vibrator on the skull to the inner ear is completely osseous. An additional mechanism may play a prominent role. In rats, a bone Vibrator was applied to the skull and also directly on the brain, after removing bone (a craniotomy), exposing the brain. Auditory nerve-brainstem evoked response (ABR) could be elicited not only with the Vibrator on bone, but also with the Vibrator directly on the brain. Similar results were obtained in guinea-pigs and fat sand rats. Noise masked this ABR. Extensive removal of skull bone did not alter the ABR to bone-conducted stimuli delivered to the exposed brain. Experimental elimination of the ossicular chain inertial mechanism and of the occlusion effect did not greatly alter the bone conduction response. A reduction in the fluid volume of the cranial cavity induced threshold elevations of the bone conducted ABR but not of the air conducted ABR. These findings can be interpreted as evidence that the ‘classical’ bone conduction mechanisms should be modified to include a major pathway for cochlear excitation which is non-osseous: when a bone Vibrator is applied to the skull, the bone vibrations may induce audio-frequency sound pressures in the skull contents (brain and cerebro-spinal fluid) which are then communicated by fluid channels to the fluids of the inner ear.
Z. Wei - One of the best experts on this subject based on the ideXlab platform.
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Extending the Vibroseis Acquisition Bandwidth with a Newly Designed Low Frequency Seismic Vibrator
EAGE Workshop on Broadband Seismic, 2015Co-Authors: Z. WeiAbstract:Acquiring low frequency data using Vibroseis technology can be very beneficial for land seismic exploration. Unfortunately, because of physical limitations in Vibrator mechanical and hydraulic systems, most conventional Vibrators cannot produce sufficient ground force at low frequencies. To successfully push Vibroseis acquisition bandwidth into the lowest frequency range (< 5 Hz), the Vibrator output force must be significantly increased. An improved design of Vibrator actuator becomes necessary. This paper attempts to present a newly designed low frequency Vibrator. Experimental results show with this new low frequency Vibrator the Vibrator ground force at low frequencies is significantly improved. Downhole data at the depth of 7500 ft (2288 m) demonstrate that a measurable force-energy from 0.5 Hz to 131 Hz (8 octaves) is achieved with this new generation low frequency Vibrator.
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Improving Vibroseis Data Quality with the Vibrator-ground Model
77th EAGE Conference and Exhibition 2015, 2015Co-Authors: Z. Wei, Y. PanAbstract:Vibroseis technology has earned worldwide popularity in land seismic exploration. The objective of the vibroseis method is for Vibrators to produce a known and spatially stable vibroseis wavelet so that any variations in seismic reflection data can be used for the determination of subsurface geology. Therefore, to obtain high quality sub-surface images, it is very important and necessary to know the true vibroseis source wavelet that is propagated into the medium of the earth. This paper proposes a new model, which is referred to as the Vibrator-ground model, to simulate the filtering effects of a complex Vibrator-ground coupling system. With this Vibrator-ground model the true vibroseis source signature can be estimated accurately. Furthermore, experimental tests demonstrate that the pilot sweep wavelet filtered by the Vibrator-ground model can significantly improve the image quality.
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Analysis of Vibrator performance at low frequencies
First Break, 2011Co-Authors: Z. Wei, F. PhillipsAbstract:It has been recognized that extending the bandwidth of seismic measurements below 10 Hz can bring many benefits for geophysical exploration. Due to physical limitations in Vibrator mechanical and hydraulic systems, the ability of seismic Vibrators to produce significant output power at low frequencies is limited. This paper focuses on the key factors that limit Vibrator performance at low frequencies and demonstrates them empirically. Our main purpose is to help geophysicists understand seismic Vibrator performance at low frequencies so that they can design an optimal low frequency sweep.
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Overview of Seismic Vibrator Control Electronics
73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011, 2011Co-Authors: Z. Wei, Thomas F. PhillipsAbstract:Seismic Vibrators have been widely used in land seismic exploration. To improve the Vibrator performance, it is important and necessary to accurately control the Vibrator ground force output. The success of the Vibroseis technology greatly depends upon the ability of the Vibrator control electronics to precisely control the amplitude and phase spectra of the Vibrator ground force as well as the harmonic distortion on the Vibrator ground force. This paper is intended to provide an overview of the Vibrator performance on these fundamentals when the Vibrator is controlled by three different control electronics.
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Extending the Low Frequency Content for Improved Vibrator Performance
73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011, 2011Co-Authors: Z. Wei, Thomas F. PhillipsAbstract:Subsurface image resolution can be improved by extending signal frequency bandwidth toward both higher and lower frequencies. Particularly, the low frequencies are very important in seismic trace inversion to improve the accuracy of the surface velocity. However, the Vibrator performance at low frequencies is restrained by mechanical and hydraulic limits that exist in the Vibrator system. For example, the reaction mass stroke and harmonic distortion significantly limit the Vibrator drive level and the quality of the ground force output from the Vibrator. This paper compares downhole and surface geophone data produced by two different Vibrators, a unmodified Vibrator and a modified Vibrator. The results demonstrate that the modified Vibrator enhances signals at low frequencies.
Qing Li - One of the best experts on this subject based on the ideXlab platform.
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research on the signal process of a bell shaped Vibratory angular rate gyro
Sensors, 2014Co-Authors: Zhong Su, Qing Li, Meng Yin FuAbstract:A bell-shaped Vibratory angular rate gyro, which is inspired by the Chinese traditional bell, is a kind of axisymmetric shell resonator gyroscope. Its sensitive element is a Vibratory-like Chinese traditional bell, using a piezoelectric element on the wall of the Vibrator to detect the standing wave’s precession to solve the input angular rate. This work mainly studies the circuit system of a bell-shaped Vibratory angular rate gyro. It discusses the process of circuit system design, analysis and experiment, in detail, providing the foundation to develop a bell-shaped Vibratory angular rate gyro. Since the bell-shaped resonator’s curved structure has the characteristics of large noise in the piezoelectric signal and large harmonics, this paper analyzes its working and signal detection method, then gives the whole plan of the circuit system, including the drive module, the detection module and the control loop. It also studies every part of the whole system, gives a detailed design and analysis process and proves part of the circuit system using digital simulation. At the end of the article, the test result of the circuit system shows that it can remove the disadvantages of the curved structure having large noise in the piezoelectric signal and large harmonics and is more effective at solving the input angular rate.
