Loading...
Search for:
variable-displacement
0.008 seconds
Identification Dynamic Modeling and Analysis of a Variable Displacement Axial Piston Pump
, M.Sc. Thesis Sharif University of Technology ; Salarieh, Hassan (Supervisor)
Abstract
According to high nominal pressure and controllable flow, variable displacement axial piston pumps are used widely in hydraulic industry. However, there still exist many problems and limitations in the areas of design, controllers and performance. To solve the problems without wasting time and money in making prototypes, an accurate dynamic model of the pump is required which predicts pump behavior under various control signals and loads. The lack of simple and practical methods of measuring describing parameters of pump dynamics, makes investigation and verification of such a model very challenging. In this thesis, literature review is presented in a wide range. After investigating of...
Modeling and Sensitivity Analysis of a Servohydraulic Pump
, M.Sc. Thesis Sharif University of Technology ; Kazemzadeh Hannani, Siamak (Supervisor) ; Saadat Foumani, Mahmoud (Co-Advisor)
Abstract
Servo hydraulic pumps are being utilized in hydraulic circuits to prevent hydraulic oil reaching high temperatures in result of relief valve’s functions. In this study, we focus on modeling and sensitivity analysis of a pump of this kind. At first the importance of the current study and some of related studies has been discussed and some of the appropriate results has been represented. Then by employing CFD and Fluent code, the flow around servo valve of pump has been simulated, and operational curve of the valve has been calculated. This curve has been verified by results of the experimental set. At the next stage of the study, by modeling Dynamic parts of the pump in SIMULINK software and...
Multi-objective optimization of piezoelectric microactuator using genetic algorithms
, Article 2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008, Boston, MA, 31 October 2008 through 6 November 2008 ; Volume 13, Issue PART B , 2009 , Pages 723-730 ; 9780791848746 (ISBN) ; Hasannia, A ; Sharif University of Technology
2009
Abstract
In flex-tensional piezoactuators, due to the low displacement of piezostacks, a compliant mechanism is used to amplify displacement of piezostack. In this paper, optimization of a compliant mechanism with corner-filleted flexure hinges is carried out using real-coded genetic algorithms (GAs) to avoid trapping in local optimums. The objective functions are displacement amplification and stiffness of mechanism and design variables are cross-sectional size and material used. The constraints which are applied on mechanism are based on piezostack dimensions and manufacturing limits. Displacement amplification and stiffness are calculated using strain energy and Castigliano's displacement theorem....