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Simultaneous Wireless Power and Data Transfer System With Single Coil Based on Multifrequency Modulation

Abstract

The existing energy modulation simultaneous wireless power and data transfer (EM-SWPDT) system will cause severe load voltage drop and power efficiency reduction at the data transmitting. Besides, those methods can only achieve simplex communication. To solve these problems, this article proposes a single coil half-duplex communication EM-SWPDT system using a novel multifrequency modulation, which can enhance data transmission performance. By modulating the conduction angle of the converter with desired signal frequency, the steady state and sinusoidal fluctuating states are realized, which compose different data wave, respectively. Because the data transmission relies on frequency information instead of amplitude information, the load voltage drop can be reduced. And the phase-shifting equivalent current model is constructed to evaluate the influence of data transmission on load voltage. Since the data modulation is performed by the converters of wireless power transfer system, additional auxiliary data circuits, such as signal generators and wave trappers are omitted and branch crosstalk is reduced. Therefore, the influence of data transmission on power transmission efficiency is weak. Finally, the effectiveness of the proposed EM-SWPDT system with a novel multifrequency modulation is verified by experimental platforms.

article Article

date_range 2024

language English

link Link of the paper

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Yang Zhen

Gan Chun

Shi Haochen

Chen Yu

Ni Kai

Qu Ronghai

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Featured Keywords

Modulation

Data communication

Resonant frequency

Inverters

Frequency shift keying

Demodulation

Half-duplex system

Energy modulation simultaneous wireless power and data transfer (EM-SWPDT)

half-duplex communication

multifrequency modulation

phase-shifting equivalent current model

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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