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 : Ha'iri-Yazdi (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Esmaeel A. Bagherpour,Mohammad-Reza Ha’iri-Yazdi,Mohammad J. Mahjoob 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
In this paper, we deal with residual vector generation for fault detection problems in linear systems via unknown input observer (UIO)when the so-called observer matching condition is not satisfied. Based on the relative degree between unknown input and output, a vectorof the auxiliary output is introduced so that the observer matching condition is satisfied with respect to the vector. Auxiliary outputs arerelated to the derivatives of measured signals. However, differentiation leads to excessive amplification of measurement noise. A dynamicallyequivalent configuration of linear systems is developed using successive integrations to avoid differentiation. As such, auxiliaryoutputs are constructed without differentiation. Then, the equivalent dynamic system and its corresponding auxiliary outputs are used togenerate the residual vector via an exponentially converging UIO. Fault detection in the generated residual vector is also investigated. Finally, the effectiveness of the proposed method is shown via numerical simulation.
-
Masoud Masih-Tehrani,Mohammad-Reza Ha’iri-Yazdi,Vahid Esfahanian,Hossein Sagha 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.12
In this paper, a hybrid energy storage sizing algorithm for electric vehicles is developed to achieve a semi-optimum cost-effective design. Using the developed algorithm, a driving cycle is divided into its micro-trips and the power and energy demands in each micro-trip are determined. The battery size is estimated because the battery fulfills the power demands. Moreover, the ultra-capacitor (UC) energy (or the number of UC modules) is assessed because the UC delivers the maximum energy demands of the different micro-trips of a driving cycle. Finally, a design factor, which shows the power of the hybrid energy storage control strategy, is utilized to evaluate the newly designed control strategies. Using the developed algorithm, energy-saving loss, driver satisfaction criteria, and battery life criteria are calculated using a feed-forward dynamic modeling software program and are utilized for comparison among different energy storage candidates. This procedure is applied to the hybrid energy storage sizing of a series hybrid electric city bus in Manhattan and to the Tehran driving cycle. Results show that a higher aggressive driving cycle (Manhattan) requires more expensive energy storage system and more sophisticated energy management strategy.
-
Design and Implementation of a Novel Vertical Precision Positioner
Ali Abdi,Masoud Shariatpanahi,Mohammad-Reza Ha’iri-Yazdi,Saeed Mazraeh 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.11
Vertical precision positioning is distinguished from positioning in horizontal plane due to the presence of gravitational forces that work differently in “lifting” and “lowering” modes. Vertical positioners also need a “locking mechanism” to avoid the unintentional lowering of the platform. We present a vertical precision positioner that works according to the “stick–slip” phenomenon. Using an adjustable off set coupling, the linear motion of a piezoelectric actuator is converted to the rotational motion of a low friction lead screw which results in the vertical motion of the screw. A microcontroller can adjust the grip, and hence the friction, between the coupling and the lead screw to ensure the uniformity of motion in lifting and lowering modes. The dynamic model of the mechanism is extracted, and simulations are performed to discover how the peak voltage and frequency of the saw-tooth signal affect the stick–slip motion of the mechanism. Additionally, equations are verified by comparing simulation results and experiments. They can be used in the control system design in future works.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
