Current Issue : April - June Volume : 2020 Issue Number : 2 Articles : 5 Articles
With the rapid development of the time-sharing rental business model for electric vehicles,\nthe remote control speed of the electric vehicle terminals device, as the most important part of the\nwhole time-sharing rental business process, affects directly the integrity of the business process\nand the using feelings of consumers. However, the traditional remote control system by using\ngeneral packet radio service (GPRS), 3G, and 4G long term evolution (LTE) wireless communication\nmethods responds longer and slower in weak signal area, which directly affects the userâ??s feeling and\nmanagement strength of platform management center for the electric vehicle. Therefore, in this paper,\n(1) the acoustic communication technology as an auxiliary communication method is introduced in\nthe novel vehicle terminal; (2) In order to increase the anti-noise ability, â??amplitude-shift keying (ASK)\n+ frequency-shift keying (FSK)â? compound modulation and â??double microphone inputâ? technology\nare used in the vehicle terminal, which develops a novel vehicle terminal with the high anti-noise\nacoustic wave communication function for the electric vehicle in time-sharing rental mode; and (3)\nthe mobile phone acoustic waves can be used by the proposed vehicle terminal to control the door of\nelectric vehicle, which provides a firm technical support for ensuring the fluency and completeness\nof the whole process. Tests prove that the acoustic communication technology of the novel vehicle\nterminal can realize the rapid response of the vehicle terminal, which effectively solves the problem of\na prolonged and slow response in the vehicle terminal of the electric vehicle in the weak signal area....
The main purpose of this study was to create an acousto-optic control lock device to convert\nelectrical signals with a specific sound command using an acousto-optic conversion module, thereby\nimproving the reliability and safety of opening or closing remote controlled door locks, such as car\ncentral locks or rolling doors. We used music playing through a smart phone speaker to create a\nspecial laser pointer to connect with the smart phoneâ??s auxiliary input. The laser pointer (wavelength\nof 630-650 nm and maximum output of 5 mw) lights up when the smart phoneâ??s music starts playing\nat a music frequency matching the light frequency. When the solar panel receives light, it converts the\nfrequency of the light signal into an electrical frequency signal. The current is amplified using the\npower amplifier and then the amplified current flows to the sound recognition module. The sound\nrecognition module performs audio comparison on the set sound signal, and once the comparison is\ncorrect, the output voltage activates the electromagnetic switch on the door to open or close it....
Improving soundscape studies and policies states that the soundscape approach, which also\nconsiders noise interventions, should replace noise management. However, a considerable number\nof soundscape studies have been concerned with the quality of acoustic environments of open and\nurban public spaces. This study focuses on indoor soundscaping and its possible integration into\nthe architectural design and application process. Therefore, the present and ongoing Turkish and\nEuropean soundscape and noise management policies were evaluated in detail and compared in\norder to characterize the gap regarding the state of indoor soundscaping between the literature and\nthe policy development level. Furthermore, we identified and classified factors and methods which\nhave an influence on indoor soundscaping to be integrated into the final proposed model. As a result\nof the detailed evaluation regarding policies and indoor soundscaping principles, five stages were\nproposed that can be used in an integrated indoor soundscape model: (1) the establishment of a\ntopic specific institution or working group on indoor soundscaping; (2) the preparation of a standard\nthat includes definitions, indoor soundscape factors and methods; (3) the preparation of an indoor\nsoundscape directive; (4) the preparation of indoor soundscape guidelines; and (5) the provision of\nmaintenance and supervision by experts and authorities....
The stability of a combustion chamber with a gas-centered swirl coaxial injector is investigated over a wide range of operating\nconditions in the aspect of thermoacoustic instabilities. First, flame shapes induced by the injector are analyzed for various\nrecess lengths from experimental results. The spreading angle and flame size are reduced as the recess length increases. And, as\na stability criterion, the damping factor is introduced. The operating conditions are divided into 7 sets with 9 tests, and fuel\nmass flow is fixed in each set. Stability boundaries are identified in terms of damping factor for the 63 tests by experiments\nwithout external perturbations. The stability map for the self-excited instability is obtained and it reveals two unstable regions.\nOne is located at low dynamic head ratio and the other one is at high dynamic head ratio. A stable region is found at moderate\ndynamic head ratios. Relative stability is evaluated by various flow parameters over a wide range of operating conditions in the\ncombustion chamber with a gas-centered swirl coaxial injector....
Aircraft operators being faced with water accumulation in fuel tanks on a daily basis and\nare looking for reliable detection systems to determine the remaining amount of accumulated ice\nduring maintenance after flight. Using such a technology, an increase in the safety and efficiency\nof the aircraft operation would be possible in this highly competitive market. This article presents\nthe use of the Acoustic Emission Technique (AE) for the reliable and non-invasive monitoring of the\nmelting of ice in fuel tanks. This technology is in principle based on the fact that a phase transition\ncomes frequently along with stress relaxation that can be used for monitoring the process. Therefore,\nthe melting of water can, in essence, be monitored with AE without accessing the ice directly.\nThe analysis of the AE signals has been carried out in the time domain since it was the melting of ice\nneeded to be monitored as a function of temperature rise time. The insights presented in this paper\ncan possibly lead to new technologies for ice detection, especially in remote areas that are not easily\naccessible with other techniques....
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