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 : Mohammad Durali (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Experimental and numerical investigations of radial flow compressor component losses
Mohammad Mojaddam,Ali Hajilouy-Benisi,S. Abolfazl Moussavi-Torshizi,Mohammad Reza Movahhedy,Mohammad Durali 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
This research numerically and experimentally investigates a small turbocharger radial flow compressor with a vane-less diffuser andvolute. The geometry of the compressor is obtained via component scanning, through which a 3D model is prepared. The flow inside thismodel is numerically analyzed by using a Navier-Stokes solver with a shear-stress transport turbulence model. The characteristic curvesof the compressor and the contributions of its components to total pressure drop are acquired by measuring the static and total pressuresat different cross sections of the compressor. Numerical results are verified with the experimental test results. The model results exhibitgood agreement with the experimental results. In particular, the results show that the losses related to the impeller are higher than thoserelated to the stationary components at different conditions, with the former causing a decline of at least 15% in compressor isentropicefficiency. The contribution of stationary components to efficiency decrease is approximately 4.8% at maximum efficiency mass flowrate and is limited to 7.1%. At low mass flow rates, the contribution of the diffuser to efficiency decline is higher than that of the volute. This finding is reversed at high mass flow rates. The performances of the diffuser and the volute are also studied by exploring total pressureand static pressure recovery coefficients, as well as the net radial force on the impeller shaft under a wide operating range.
-
VEHICLE TRAJECTORY CHALLENGE IN PREDICTIVE ACTIVE STEERING ROLLOVER PREVENTION
Mohammad Ghazali,Mohammad Durali,Hassan Salarieh 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.3
High center of mass vehicles are likely to rollover in extreme maneuvers. Available works present control strategies to prevent rollover. In these works, however, other important parameters such as path trajectory tracking are not a main concern. In this paper conflicts between rollover prevention and trajectory tracking is investigated. Model predictive control (MPC) is adopted to predict and avoid rollover while tracking desired trajectory. For this regard a model based future error estimation is introduced. The control framework predicts both rollover and trajectory error simultaneously. It avoids rollover while tries to track the trajectory. Simulation results for two controllers with and without trajectory tracking are presented. The results indicate that the controllers effectively limit rollover as a hard constraint while the trajectory tracking controller also minimizes and recovers the path error.
-
Design and analysis of a novel parallel mechanism for prosthetic knee wear test simulators
Fatemeh S. Daeinejad,Farzam Farahmand,Mohammad Durali,Mohammad H. Abedinnasab 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
Using a parallel mechanism in the wear test simulators of prosthetic knees provides an easy access to the femoral and tibial components during tests. Moreover, because of its higher accuracy and load capacity, in comparison with serial mechanisms, it allows simulation of heavier tasks, such as climbing stairs, to be performed. This paper describes a new 3 Degree of freedom (DoF) spatial 2T1R (T:Translational DoF; R: Rotational DoF) parallel mechanism, for reproducing the force and motion of the tibial component of the knee prostheses in a wear test simulator. Kinematics and dynamics analysis of the mechanism indicated that it can satisfy the required DoFs, workspace and load capacity prescribed in the standard. Also, evaluation of the performance of the mechanism using the simMechanics toolbox of MATLAB revealed that it can reproduce the prescribed forces/torques with relatively high accuracy. However, the mechanism’s force outcomes were found to be affected by inaccuracies in mounting the prosthesis components, although less than the previous serial simulators. In comparison of the different possible architectures, a lateral leg angulation of 45 degrees provided the best efficacy, considering the size of actuators, the overall size of the mechanism and the accessibility of the test sample.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
