The paper presents an optimizing method of energy parameters of three-phase induction motor in order to improve their efficiency class from IE2 to 1E3 or IE4. These efficiency classes are defined in the European stand...
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The paper presents an optimizing method of energy parameters of three-phase induction motor in order to improve their efficiency class from IE2 to 1E3 or IE4. These efficiency classes are defined in the European standard IEC 60034-301:2014. The optimization is performed using specific software by successively adjusting the geometry and the technology. The results have been validated by experiments within the UMEB SA laboratories. The three-phase induction motor that has been analyzed has a rated output of 45 kW, 380V (delta connection), rated speed 1475 rot/min and squirrel-cage rotor type.
The iterative closest point (ICP) problem is very important in multiple fields such as robotics, machine vision, automotive or assistive technologies. The problem is to find the optimal transformation that can align t...
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ISBN:
(纸本)9781509027217
The iterative closest point (ICP) problem is very important in multiple fields such as robotics, machine vision, automotive or assistive technologies. The problem is to find the optimal transformation that can align two sets of 3D points. Even if in the recent year new variations of ICP were proposed, the algorithm may get trapped in local minima due to the non-convexity of the problem. This issue may be overcome if the initial guess is chosen as close as possible to the true solution. In this paper a tensorial based method is proposed for choosing the initial guess of the iterative closest point problem. This new approach is strongly connected with the parameters that can be used to describe the displacement of rigid bodies. Using an isomorphism between the special Euclidean group SE 3 and the orthogonal dual tensors group SO 3 , a detailed procedure is described on how to compute the initial guess for the iterative closest point problem. An evaluation of the proposed method is done using a Matlab framework that implements the ICP algorithm.
The research on assisting visually impaired people to navigate in unknown environments commonly employs image processing or computer vision techniques. One key element that needs to be identified in the surrounding en...
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ISBN:
(纸本)9781509027217
The research on assisting visually impaired people to navigate in unknown environments commonly employs image processing or computer vision techniques. One key element that needs to be identified in the surrounding environment of a blind user is the ground plane. Its accurate detection is highly important because the user is able to move freely in that area. An assistive device should primarily assist the user in avoiding the obstacles that lie on the ground surface. The images that will be further processed are usually acquired using depth acquisition devices worn by the user. Therefore, in contrast with automotive or robotics applications, which also heavily rely on ground plane extraction for obstacle detection, the camera orientation has more degrees of freedom. This leads to the requirement of designing more complex solutions for the ground plane detection in the case of assistive systems for the visually impaired. In this paper we introduce an algorithm to detect the ground plane taking into consideration the orientation of the camera, namely its pitch and roll. The proposed algorithm is based on an efficient processing of the v-disparity map associated to each frame. A two-step decision making approach to determine the most suited area that corresponds to the ground plane is described. Experimental results with synthetic datasets are provided to prove the efficiency and robustness of the proposed approach.
This paper considers cluster detection in Block Markov Chains (BMCs). These Markov chains are characterized by a block structure in their transition matrix. More precisely, the n possible states are divided into a fin...
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This paper presents the new laboratory test rig of the vertical axis flexible shaft supported by two active magnetic bearings. Behind the motivation of establishing this setup is the control of vibration modes of the ...
This paper presents the new laboratory test rig of the vertical axis flexible shaft supported by two active magnetic bearings. Behind the motivation of establishing this setup is the control of vibration modes of the flexible rotor - shaft assembly, while the rotational speed varies and the unbalanced mass on the whirling disc is introduced to the system. The proposed model is aimed to simulate real operation conditions of the rotating machinery with an applied external load, with a variable structure caused by a change of material properties of the rotor - shaft assembly, or due to a fault of some elements coupled with the rotor.
As the Industrial Internet of Things evolves, ever more data acquisition devices are integrated inside factories, silos, agriculture facilities, industrial facilities, cars and many other applications. One of the most...
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As the Industrial Internet of Things evolves, ever more data acquisition devices are integrated inside factories, silos, agriculture facilities, industrial facilities, cars and many other applications. One of the most common measured parameter, that also creates the most problems in specific applications, is temperature. There is an abundance of analog temperature transducers, available for engineers and researchers, with varying precision, temperature range, linearity, power consumption, and cost. Besides invasive temperature sensors and transducers, in recent years microwave based temperature measurement methods have been developed. The current paper presents one method of reading thermocouples without the need of a high resolution ADC or digital calculation of complex polynomial functions. The article is focused on the linearization circuit, measurement results, errors and presents a short application using NI WSN nodes as part of IIoT.
With the growth of the Internet, recommendations have become a fact of life and there is a big competition between companies to get as much market share as possible. This is achievable not only through fast to market ...
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ISBN:
(纸本)9781509027217
With the growth of the Internet, recommendations have become a fact of life and there is a big competition between companies to get as much market share as possible. This is achievable not only through fast to market solutions but also by constantly providing high quality services. Considering the speed of current technological advancements, it is impossible to conceive a world without some form of prediction. Traditionally, recommendations have been computed using the collaborative filtering method, but the growth of available information has pushed research into other directions such as content based, demographic based, utility-based, knowledge-based and hybrids. This paper provides an introduction to collaborative filtering and content based methods, describing the underlying concepts, and discusses possible improvements using overclassification. Individual results are presented and then compared with the overclassification approach.
Networked embedded systems using event triggered communication are widely used in industry. While the bus load increases, the transmission of the lower priority messages may experience variable delays (jitter) or even...
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ISBN:
(纸本)9781509027217
Networked embedded systems using event triggered communication are widely used in industry. While the bus load increases, the transmission of the lower priority messages may experience variable delays (jitter) or even may be unable to be transmitted. Even at maximum load, the transmission of such messages has to be guaranteed and the delivery time has to be determined with high precision. CANopen is an industrial event-driven network based on controller Area Network (CAN) protocol at the physical and data link communication levels. A time-triggered software extension of CANopen based on Time-Triggered CAN is described in this paper, as well as its implementation on an embedded networked system based on microcontrollers.
The paper presents a symmetrical T-network utilizing fractional order elements. Fractional calculus was used for its modeling. A comparative analysis of a classic T-network and fractional order T-network step response...
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The paper presents a symmetrical T-network utilizing fractional order elements. Fractional calculus was used for its modeling. A comparative analysis of a classic T-network and fractional order T-network step responses was carried out for both no-load condition and short-circuit condition.
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