Some Practical Problems of Communications Reliability in Enviromental Monitoring Systems

Dziadak, Bogdan; Makowski, Ł.; Michalski, A.

doi:10.2478/mms-2013-0029

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…The communication between the node and the network hub has been verified. This communication structure has already been successfully used by us in a system for water quality monitoring [25]. The maximum communication span was 65 m in free space and 45 m inside the building.…”

Section: Half-bridge1mentioning

confidence: 99%

Structural Health Monitoring System for Snow and Wind Load Measurement

Dziadak

2020

Electronics

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This article presents a system for monitoring the load caused by strong winds and snow on buildings’ roofs. An estimation of the total load on the structure is obtained by measuring the strain on the main roof girders. The system is based on a wireless sensor network structure. The measurement node uses metal strain gauges and strain sensors based on conductive carbon polymers. The application of such sensors allowed us to achieve a measurement resolution of 5.5 ustrain. The node is managed by an Atmeg8A microcontroller. The use of energy saving modes allows for a battery life of 6 months.

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Section: Half-bridge1mentioning

confidence: 99%

Structural Health Monitoring System for Snow and Wind Load Measurement

Dziadak

2020

Electronics

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“…The crucial step in the PV Optimizer design procedure is the identification of electronic components able not only to assure its feasibility in terms of current and voltage rates, but also to assure its high performance in the presence of temperature variations causing a change of their properties. So, an electronic-thermal design method [8][9][10][11] becomes a necessary approach in the development of DMPPT converters to ensure fulfilling by the power devices the electrical and thermal requirements which strongly influence the energetic, efficiency and reliability performance of the complete PV Optimizers. Many methods are available to reach this purpose, such as modern mathematical algorithms, Model Order Reduction (MOR) methods, and so on.…”

Section: Distributed Maximum Power Point Tracking Convertermentioning

confidence: 99%

“…In fact, the reliability R(t) is defined in [9] as the probability that an item, in our case the PV plant, performs the required function, without a failure under stated conditions for a stated period of time. From the definition, it is evident that maintaining the reliability is an essential need in modern systems, especially in continuously changing working conditions of systems [10][11][12][13][14][15][16][17][18][19][20][21], such as the PV ones. In detail, the reliability engineering of an electronic and mechanical equipment requires a means for a quantitative baseline, or a reliability prediction analysis.…”

Section: Power Optimizers Reliability Assessmentmentioning

confidence: 99%

Measurement and Comparison of Reliability Performance of Photovoltaic Power Optimizers for Energy Production

Catelani¹,

Ciani²,

Graditi³

et al. 2015

Metrology and Measurement Systems

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Photovoltaic (PV) power optimizers are introduced in PV systems to improve their energetic productivity in presence of mismatching phenomena and not uniform operating conditions. Commercially available converters are characterized by different DC-DC topologies. A promising one is the boost topology with its different versions. It is characterized by its circuital simplicity, few devices and high efficiency values -necessary features for a Distributed Maximum Power Point Tracking (DMPPT) converter. PV power optimizer designs represent a challenging task since they operate in continuously changing operating conditions which strongly influence electronic component properties and thus the performance of complete converters. An aspect to carefully analyze in such applications is the thermal factor. In this paper, a necessity to have a suitable temperature monitoring system to avoid dangerous conditions is underlined In addition, another important requirement for a PV power optimizer is its reliability, since it can suggest a useful information on its diagnostic aspects, maintenance and investments. In fact, a reliable device requires less maintenance services, also improving the economic aspect. The evaluation of the electronic system reliability can be carried out using different reliability prediction models. In this paper, reliability indices, such as the Mean Time Between Failure (MTBF) or the Failure Rate of a Diode Rectification (DR) boost, are calculated using the evaluation of the Military Handbook 217F and Siemens SN29500 prediction models. With the reliability prediction results it has been possible to identify the most critical components of a DMPPT converter and a measurement setup has been developed in order to monitor the component stress level on the temperature, power, voltage, current, and energy in the DMPPT design phase avoiding the occurrence of a failure that might decrease the service life of the equipment.

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“…A real-time test system is the perfect solution in many application areas [12,13]. In this paper, a real-time multi-domain signal analysis architecture for broadband communication is first introduced, which seamlessly stores the downconverted baseband complex signal in a memory and performs simultaneously real-time spectrum analysis, modulation analysis, power measurements, timing measurements as well as statistical analysis.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Carrier Frequency Estimation Algorithm for Real-Time Multi-Domain Communication Signal Analysis

Wang¹,

Yang²,

Yan³

et al. 2014

Metrology and Measurement Systems

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Based on real-time multi-domain communication signal analysis architecture, a high-efficiency blind carrier frequency estimation algorithm using the power spectrum symmetry of the measured modulated signal is presented. The proposed algorithm, which utilizes the moving averaged power spectrum achieved by the realtime spectrum analysis, iteratively identifies the carrier frequency in according to the power difference between the upper sideband and lower sideband, which is defined and revised by the estimated carrier frequency in each iteration. When the power difference of the two sidebands converges to the preset threshold, the carrier frequency can be obtained. For the modulation analysis, the measured signal can be coarsely compensated by the estimated result, and the residual carrier frequency error is eliminated by a following carrier synchronization loop. Compared with previous works, owing to the moving averaged power spectrum normalization and the smart iterative step variation mechanism for the two sidebands definition, the carrier frequency estimation accuracy and speed can be significantly improved without increasing the computational effort. Experimental results are included to demonstrate the outstanding performance of the proposed algorithm.

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Some Practical Problems of Communications Reliability in Enviromental Monitoring Systems

Cited by 6 publications

References 14 publications

Structural Health Monitoring System for Snow and Wind Load Measurement

Structural Health Monitoring System for Snow and Wind Load Measurement

Measurement and Comparison of Reliability Performance of Photovoltaic Power Optimizers for Energy Production

High-Efficiency Carrier Frequency Estimation Algorithm for Real-Time Multi-Domain Communication Signal Analysis

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