Wyniki wyszukiwania - BazTech

1

An arbitrary waveform synthesis structure with high sampling rate and low spurious

Zhao Wenhao, Tian Shulin, Guo Guangkun, You Jiajing, Wu Qiong, Liu Ke

Metrology and Measurement Systems

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2022

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Vol. 29, nr 1

159--173

EN

The arbitrary waveform generator is characterised by its flexible signal generation, high frequency resolution and rapid frequency switching speed and is wildly used in fields like communication, radar systems, quantum control, astronautics and biomedicine. With continuous development of technology, higher requirements are placed on to the arbitrary waveform generator. Sampling rate determines the bandwidth of the output signal, spurious-free dynamic range determines the quality of generated signal. Due to above, these two indicators’ improvement is vital. However, the existing waveform generation methods cannot generate signals with quality good enough due to their technical limitations, and in order to realize a high system sampling rate, to accomplish waveform generation process in FPGA, multipath parallel structure is needed. Therefore, we proposed a parallel waveform synthesis structure based on digital resampling, which fixed the problems existing in the current methods effectively and achieved a high sampling rate as well as high quality arbitrary waveform synthesis. We also built up an experimental test bench to validate the proposed structure.

2

A method for evaluating and upgrading systems with parallel structures with forced redundancy

Michlowicz Edward, Wojciechowski Jerzy

Eksploatacja i Niezawodność

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2021

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Vol. 23, no. 4

770--776

EN

The objects of the study are parallel-structure machine systems with redundancy associated with safety assurance of continuous material flow. The problem concerns systems in which the supply of materials takes place continuously (24 hours a day), and the system of operated machines must ensure the receipt and movement of the material at a strictly defined time and in the desired quantity. It is a system where the presence of a failure poses a threat to human life and environmental degradation. This paper presents a method for system condition assessment and upgrading for maintaining proper operation under conditions of continuous operation. A database of information about the current parameters of the system components (measurements, monitoring) is necessary for condition assessment. The method also uses lean techniques (including TPM). System evaluation and selection criteria for a suitable structure in terms of further operation were proposed. Exemplification was performed for an underground mine drainage system. As a part of the identification, selected parameters of the system components were measured, and their characteristics (motors, pumps, pipelines) were developed. The results of the analysis and the values of the adopted criteria were compared to the indicators for new pump sets. A two-option system upgrade was proposed, in addition to machine operating schedules, maintenance periods, and overhaul cycles.

3

Interference impact on the electronic safety system with a parallel structure

Pas J., Siergiejczyk M.

Diagnostyka

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2016

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Vol. 17, No. 2

49--55

EN

The electronic safety systems are systems, the aim of which is to detect threats in the transport process – for stationary and moving objects. These systems are increasingly being used in the transport process, where they provide safety – to people as well as goods transported in the stationary and moving objects. These systems operate in a diverse electromagnetic environment. The paper presents the research results of the electromagnetic interference impact on the electronic safety system with a structure of the control panels connected in parallel. The interference impact on selected operating parameters was presented for two frequency ranges, i.e. ELF (0÷2) kHz and VLF (2÷100) kHz frequency ranges

PL

Elektroniczne systemy bezpieczeństwa są to systemy, których celem jest wykrywanie zagrożeń występujących w procesie transportowym - dla obiektów stacjonarnych i ruchomych. Systemy te są coraz częściej stosowane w procesie transportowym, gdzie zapewniają bezpieczeństwo – ludziom, przewożonym towarom w obiektach stałych oraz ruchomych. Systemy te pracują w zróżnicowanym środowisku elektromagnetycznym. W artykule przedstawiono wyniki badań oddziaływania zakłóceń elektromagnetycznych na elektroniczny system bezpieczeństwa o strukturze central alarmowych połączonych równolegle. Wpływ zakłóceń na wybrane wskaźniki eksploatacyjne przedstawiono dla dwóch zakresów częstotliwości, tj. zakres częstotliwości ELF (0÷2) kHz oraz VLF (2÷100) kHz.

4

Mechatroniczny moduł o strukturze równoległej dla elastycznej produkcji montażowej

Nikolajev V.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2012

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z. 84[284], nr 1

13-19

EN

Factors defining the efficiency of standard modules regulating the movement reproduction in flexible assembly systems are considered. The mechatronic module of parallel structure is characterized by the specific connection of its target link with the basis by means of two kinematical chains each of which contains a complete electric drive. The required movements are reproduced by computer management of engine rotation frequencies. The identification of technological situations is realized on representing tra-jectories Technical characteristics of the module are provided.

5

Modularyzacja w obrabiarkach i robotach o strukturach równoległych.

Szadkowski J.

Technologia i Automatyzacja Montażu

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2006

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nr 2

11-13