Wyniki wyszukiwania - BazTech

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Fuzzy logic controller to control the active air suspension

Woś Piotr, Dindorf Ryszard, Takosoglu Jakub

Archiwum Motoryzacji

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2020

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Vol. 89, nr 3

75--86

EN

The paper presents the practical implementation of active seat suspension used in vehicles and machinery. The test object is a passive suspension system, in which the vibro-insulating properties have been improved by using an active system controlled by a pneumatic bellows cylinder. Bellows cylinders in pneumatic drives act as single-acting cylinders - push cylinders. The filled bellows cylinder under constant pressure acts as an air spring. The volume of the air cushion changes under the pressure inside. Proportional pressure valve was used to control the bellows cylinder and noncontact relative displacement laser triangulation sensor was used to measure displacement of the seat. A Proportional-Derivative-Fuzzy Logic Controller (PD-FLC) was used for the control. The use of Fuzzy Logic Controller (FLC) enables the transition from a quantitative description to a qualitative process. The system structure with a designated output control function has been presented. Test results on the seat suspension vibro-insulating properties of a working machine are presented.

2

Mechanical systems with air spring flexible elements

Vinogradov Borys

Zeszyty Naukowe. Transport / Politechnika Śląska

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2019

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z. 103

199--207

EN

The purpose of this study was to assess the effectiveness of flexible air-spring systems operating in parallel to share the total load, taking into account installation and in-operation errors. This study presented experimental and calculated characteristics of the air spring flexibility and its dependence on the polytropic index and additional volume. It considered patterns of load distribution between the air springs when they are operating in parallel to share the total load for the case when the air springs were used as the supporting elements for various machines and units, and between transmission lines containing flexible couplings, where air springs were installed as flexible elements.

3

Optimization of mounting of a machine and its parts

Vondrich J., Havlicek R.

Journal of Machine Engineering

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2008

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Vol. 8, No. 1

123--129

EN

Frequency dependence values of input or mutual mechanical impedances of vibrating machines and their parts can be measured using an impedance hammer and a two-channel frequence analyzer. The knowledge of the frequency response of mechanical impedance provides for the determination of properties of vibration energy transmission in the structure of the machine based on which it is possible to adjust the mounting arrangement of the machine and its parts in order to attenuate vibrations. The obtained data concerning the dynamicbehaviour of the machine then serve as a basic for a proper design and implementation of elastic mounting of the machine and its parts on damping elements which attenuate unwanted vibrations to the minimum. The design consists in assembling a model of the machine assuming that elastic mounting has been provided for, describing the model using equations of montion and elaborating their numerical solution. An efficient damping arrangement is achieved by mounting the vibrating parts of the machine using air springs. The air pressure in the air springs can be regulated according to deflections of the individual machine parts measured by accelerometers using a control element. The numeric solution provides for determination of values of stiffness coefficients k and damping coefficient c which would be optimal for the specified machine parameters in order to minimise the defections of the individual machine parts.

4

Badanie elektropneumatycznego układu wibroizolacji z adaptacyjnym układem stabilizacji wibroizolacyjnej masy

Korzeniowski R.

Czasopismo Techniczne. Mechanika

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2008

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R. 105, z. 1-M

137-149

PL

W artykule opisano układ dwukomorowej sprężyny pneumatycznej z serworozdzielaczem elektropneumatycznym i układem sterowania realizującym adaptacyjny algorytm stabilizacji wibroizolowanej masy. Projekt zrealizowano w Laboratorium Układów i Struktur Dynamicznych AGH. Połączenie tradycyjnych technik wibroizolacji z nowoczesnym układem sterowania przepływem gazu do i z komór sprężyny pneumatycznej korzystnie wpłynęło na właściwości użytkowe badanego układu wibroizolacji. Układ posiada m.in. zdolność adaptacji do zmieniających się warunków obciążenia. Zastosowany algorytm sterowania nie wpływa na kształt charakterystyki przenoszenia drgań dla częstotliwości powyżej 3 Hz. Dla częstotliwości niższych obserwowane jest wyraźne spłaszczenie szczytu rezonansowego. Przeprowadzone badania symulacyjne i laboratoryjne potwierdzają możliwość zastosowania opracowanego rozwiązania w konstrukcji nowoczesnych zawieszeń pojazdów osobowych, zawieszeń kabin pojazdów ciężarowych, jak również siedzisk maszyn roboczych.

EN

In the paper has been described double chamber air spring with electropneumatic servovalve and adaptive control system witch realize sprung mass stabilisation. Project has been realized in Laboratory of Dynamic Systems and Structures of AGH-University of Science and Technology. Connection between traditional technique and modern system controlling air flow to and out of air spring chamber has beneficial influence on the vibroisolation system exploitation parameters. Among others system has additional ability of adaptation to load changes. Developed algorithm do not influence into shape of transmissibility characteristic for frequencies grater than 3 Hz. Below that frequency significant resonant pick suppression has been observed. Mathematical modelling and laboratory tests have been carried out and they proof that designed system can be used in of modern suspension of cars, track cabs and seats of heavy duty machines construction as well.