Christian Mentin, Robin Priewald, Eugen Brenner
The two-dimensional object’s position or object’s edge can be estimated from its multi-exposure shadow projection. This can be done using two bare Laser diodes projecting the object’s edge onto a CCD or CMOS sensor without the need of any additional optical elements such as collimation lenses. For simple triangulation methods, Sensor- and laser diode position play a very important role. The overall accuracy is mostly determined by the uncertainty of that parameters. This paper presents a possible approach to determine that parameters. Since deterministic methods suffer from badly shaped...
TC4 Symposium 2017
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I. Masmitja, P. J. Bouvet, S. Gomariz, J. Aguzzi, J. del Rio, D. Mihai Toma
This paper provides a study on the precision, and the accuracy, of an underwater target tracking system with acoustic waves, using range-only and single-beacon methods, in shallow waters environments. For this study, different field tests have been realized in the OBSEA test site, a well-known and monitored area at 4 km from the coast and at 20 meters of depth, in the Mediterranean Sea (Barcelona). The tests have been conducted using two acoustic underwater modems from the company LinkQuest Inc. Moreover, the autonomous underwater vehicle developed by the Universitat Politècnica de Catalunya...
TC4 Symposium 2017
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Lizhi Hu, Zhichao Ma, Jie Xu, Liang Xu, Junwei Yu, Lian Dong, Lei Lai, Yu Sang
High precision GNSS (Global navigation satellite systems) receiver is used for precision geodetic survey, crustal movement monitoring, engineering deformation monitoring, and integrity monitoring system and so on. The interior noise level is an important index to affect the positioning accuracy of GNSS receiver. Further research on the evaluation method of this paper in the detection of GNSS receiver's interior noise level; put forward the research of interior noise of GNSS receiver evaluation method based on satellite signal simulator. Based on the original zero baseline test principle, the...
TC4 Symposium 2017
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S. I. Spiridon, E. I. Ionete, B. F. Monea, M. Vacaru
Anthropogenic pollutants are a threat for ecosystem sustainability, especially in heavy industrialized countries. Issues raised by the massive air pollution led to development and implementation of specific methods and equipment for detecting, measuring and controlling pollution directly to the source. Combined actions of multiple pollutants resulted from industrial gas emissions are of particular concern, since they generate negative effects on environment quality and human health, even when low concentrations of each individual chemical are present, that considered separately are not...
TC4 Symposium 2017
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Xuewei Wang, Yanjun Wang, Lei Wang, Xiaojuan Peng, Zhengsen Jia
In digital energy metering systems, the effect of quantization errors on the power measurement error cannot be ignored. In this paper, to clearly analyze the effect, structural models of a digital energy metering system and a power measurement element (PME) are established. The propagation of errors among the internal components of the digital energy metering system is revealed in detail. A method for analyzing the effect of quantization errors on the power measurement error based on general cyclostationary stochastic process is proposed, and mathematical model for calculating the power...
TC4 Symposium 2017
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Balázs Renczes, Vilmos Pálfi
In this paper, a scaling method is proposed and studied for the maximum likelihood sine fitting algorithm. It is shown that similarly to the case of least squares fitting, this method can significantly improve the conditioning of the investigatedalgorithm. The maximum error in the solution of a linear system of equations strongly depends on the condition number of the coefficient matrix. Namely, the condition number of the coefficient matrix upper bounds the relative error of the solution.It is shown that the condition number of the maximum likelihood fitting is connected to the Hessian...
TC4 Symposium 2017
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Michael S. J. Walter, Stefan Weiherer, Tiffany Haas, Dac L. Dao, Alexandru Sover
The increasing demand on alternatives to fossil-fuel-based mobility concepts goes hand in hand with a significant growth of research activities on electromobility. In consequence, an adequate data acquisition and preparation is highly required to quantify these research activities’ benefits. However, currentlyavailable electric cars do hardly support an easy and reliable data acquisition. This paper presents a procedure to gain and monitor relevant driving parameters of an electric car (Renault ZOE R240). Therefore, a filter application is applied to the raw data, gained via the...
TC4 Symposium 2017
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Daniel Strommenger, Clemens Gühmann, René Knoblich, Jörg Beilharz
–For a reliable prognosis of clutch wear, the knowledge of friction lining temperature is crucial. Due to the lack of temperature sensors within the clutch, a reliable model is required to estimate the friction lining temperature. In this contribution, a thermal model for dry clutch temperature estimation is presented. The thermal system is described by a lumped-element model, which is capable of estimating the friction lining temperature based on the friction energy. Furthermore, external temperature influences ofcombustion engine and ambient air, as well as nonlinear effects,are...
TC4 Symposium 2017
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Andrei Marinescu, Ionel Dumbravă, Lucian Mandache
In many electrical engineering applications it is necessary to measure some complex current signals containing high frequency periodic components (MHz) or short duration pulses (ns) superimposed on a low frequency carrier signal (usually power line frequency). For the overall measurement of such complex signals, wide band current transformers (WBCT) are currently used. The paper refers to the achievement of a wide band current transformer whose sensitivity changes automatically with the frequency of the measuring current, so as it does not reach saturation at low frequency large signals.
TC4 Symposium 2017
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Dragana Popovic Renella, Sasa Spasic, Marjan Blagojevic, Radivoje S Popovic
This paper presents several applications of advanced magnetic field measurement that include among others condition monitoring of electrical machines; magnetic field mapping of undulators, quadrupoles and sixtupoles at national lightsources, radiation centers, synchrotron centers; quality control of permanent magnets.
TC4 Symposium 2017
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