http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Ilmar Santos (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Parametric Fault Diagnosis of an Active Gas Bearing
André Sekunda,Henrik Niemann,Niels Kjølstad Poulsen,Ilmar Santos 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.1
Recently research into active gas bearings has had an increase in popularity. There are several factors thatcan make the use of gas bearings favourable. Firstly gas bearings have extremely low friction due to the usage of gasas the lubricant which reduce the needed maintenance. Secondly gas bearings is a clean technology which makes itpossible to use for food processing, air condition and applications with similar requirements. Active gas bearings aretherefore useful for applications where downtime is expensive and dirty lubricants such as oil are inapplicable. Inorder to keep as low downtime as possible it is important to be able to determine when a fault occurs. Fault diagnosisof active gas bearings is able to minimize the necessary downtime by making certain the system is only taken offlinewhen a fault has occurred. Usually industry demands the removal of any sensor redundancy in systems. Thismakes it impossible to isolate faults using passive fault diagnosis. Active fault diagnosis methods have been shownable to isolate faults when there is no sensor redundancy. This makes active fault diagnosis methods relevant forindustrial systems. It is in this paper shown possible to apply active fault diagnosis to diagnose parametric faults ona controllable gas bearing. The fault diagnosis is based on a statistical detector which is able to quantify the qualityof the diagnosis scheme.
-
Experimental analyses of dynamical systems involving shape memory alloys
Søren Enemark,Marcelo A. Savi,Ilmar F. Santos 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.6
The use of shape memory alloys (SMAs) in dynamical systems has an increasing importance in engineering especially due to their capacity to provide vibration reductions. In this regard, experimental tests are essential in order to show all potentialities of this kind of systems. In this work, SMA springs are incorporated in a dynamical system that consists of a one degree of freedom oscillator connected to a linear spring and a mass, which is also connected to the SMA spring. Two types of springs are investigated defining two distinct systems: a pseudoelastic and a shape memory system. The characterisation of the springs is evaluated by considering differential calorimetry scanning tests and also force-displacement tests at different temperatures. Free and forced vibration experiments are made in order to investigate the dynamical behaviour of the systems. For both systems, it is observed the capability of changing the equilibrium position due to phase transformations leading to hysteretic behaviour, or due to temperature changes which also induce phase transformations and therefore, change in stiffness. Both situations are investigated by promoting temperature changes and also pre-tension of the springs. This article shows several experimental tests that allow one to obtain a general comprehension of the dynamical behaviour of SMA systems. Results show the general thermo-mechanical behaviour of SMA dynamical systems and the obtained conclusions can be applied in distinct situations as in rotor-bearing systems.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
