Table of Contents

Vibration, Volume 1, Issue 1 (June 2018)

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Editorial

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Open AccessEditorial New Vibration Online Journal Will Get Us Back to Basics
Vibration 2018, 1(1), 1; doi:10.3390/vibration1010001
Received: 29 September 2017 / Revised: 29 September 2017 / Accepted: 29 September 2017 / Published: 17 October 2017
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Abstract
When Vibration approached me to be its founding Editor-in-Chief, it was explained to me that the key selling points of this new online journal would be as follows [...]
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Research

Jump to: Editorial

Open AccessArticle Frequency Measurement of Musical Instrument Strings Using Piezoelectric Transducers
Vibration 2018, 1(1), 2; doi:10.3390/vibration1010002
Received: 28 November 2017 / Revised: 18 December 2017 / Accepted: 9 January 2018 / Published: 13 January 2018
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Abstract
The use of a piezoelectric transducer to monitor the tuning of a musical instrument string has been investigated. It has been shown that the transverse resonance frequencies of the string can be identified by electrical measurements on a low-cost actuator/sensor, sufficiently discreetly to
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The use of a piezoelectric transducer to monitor the tuning of a musical instrument string has been investigated. It has been shown that the transverse resonance frequencies of the string can be identified by electrical measurements on a low-cost actuator/sensor, sufficiently discreetly to be done during a performance. This frequency measurement approach can be used as the basis for a tuning control mechanism to maintain a musical instrument string at the required pitch, without it having to be plucked or played. Such a system would be of direct benefit to harp players in particular, who have no other means to adjust a mistuned string during a performance. Some of the practical issues and implications of adding such a tuning control system to the harp are considered. Full article
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Open AccessArticle The Control of an Active Seat Suspension Using an Optimised Fuzzy Logic Controller, Based on Preview Information from a Full Vehicle Model
Vibration 2018, 1(1), 3; doi:10.3390/vibration1010003
Received: 15 December 2017 / Revised: 26 January 2018 / Accepted: 6 February 2018 / Published: 9 February 2018
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Abstract
The use of suspension preview information obtained from a quarter vehicle model (QvM) to control an active seat has been shown by the authors to be very promising, in terms of improved ride comfort. However, in reality, a road vehicle will be subjected
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The use of suspension preview information obtained from a quarter vehicle model (QvM) to control an active seat has been shown by the authors to be very promising, in terms of improved ride comfort. However, in reality, a road vehicle will be subjected to disturbances from all four wheels, and therefore the concept of preview enhanced control should be applied to a full vehicle model. In this paper, different preview scenarios are examined, in which suspension data is taken from all or limited axles. Accordingly, three control strategies are hypothesized—namely, front-left suspension (FLS), front axle (FA), and four wheel (4W). The former utilises suspension displacement and velocity preview information from the vehicle suspension nearest to the driver’s seat. The FA uses similar preview information, but from both the front-left and front-right suspensions. The 4W controller employs similar preview information from all of the vehicle suspensions. To cope with friction non-linearities, as well as constraints on the active actuator displacement and force capabilities, three optimal fuzzy logic controllers (FLCs) are developed. The structure of each FLC, including membership functions, scaling factors, and rule base, was sequentially optimised based on improving the seat effective amplitude transmissibility (SEAT) factor in the vertical direction, using the particle swarming optimisation (PSO) algorithm. These strategies were evaluated in simulation according to ISO 2631-1, using different road disturbances at a range of vehicle forward speeds. The results show that the proposed controllers are very effective in attenuating the vertical acceleration at the driver’s seat, when compared with a passive system. The controller that utilised suspension preview information from all four corners of the car provided the best seat isolation performance, independent of vehicle speed. Finally, to reduce the implementation cost of the “four suspension” controller, a practical alternative is developed that requires less measured preview information. Full article
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Open AccessArticle A Characterization of Saw Filters’ Vibrational Sensitivity
Vibration 2018, 1(1), 4; doi:10.3390/vibration1010004
Received: 27 December 2017 / Revised: 1 February 2018 / Accepted: 27 February 2018 / Published: 1 March 2018
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Abstract
A novel characterization method for discrete saw filters’ vibrational sensitivity is presented. The proposed approach allows the characterization of filters under vibrations and the extraction of a behavioural model. Filters are assumed to be transducers so that external induced vibrational energy is partially
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A novel characterization method for discrete saw filters’ vibrational sensitivity is presented. The proposed approach allows the characterization of filters under vibrations and the extraction of a behavioural model. Filters are assumed to be transducers so that external induced vibrational energy is partially transformed in an undesired simultaneous amplitude and phase modulation of the input RF signal. When the filter is mechanically excited with vibrations, it introduces spurious amplitude and phase modulation to the input signal that can potentially affect the link quality. Full article
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