A HYBRID AND EFFICIENT ADAPTIVE CARTESIAN GRID FOR SIMULATION OF UNSTEADY FLOW IN AERODYNAMICS APPLICATIONS
Published In: INTERNATIONAL CONFERENCE ON ADVANCES IN MECHANICAL AND ROBOTICS ENGINEERING
Author(s): ALIREZA JAHANGIRIAN , MIR YOSEPH HASHEMI , NIMA MOLANI
Abstract: A Hybrid Grid Generation Method that combines the computational efficiency of the Cartesian grid and the flexibility of the meshless strategy is developed for computation of the compressible invicid flows over general geometries and moving boundary applications. The meshless zone is created around the geometry by producing layers of nodes along normal direction vectors while Cartesian grid method is used elsewhere. Last layer is used as virtual geometry for automatic generation of unstructured Cartesian grid around meshless zone. An efficient central difference scheme with artificial dissipation terms is developed for both Cartesian grid and meshless zones. The method is used for computation of flows around stationary, moving and oscillating airfoil at subsonic and transonic flow conditions. Results indicate good agreements with other reference numerical data.
- Publication Date: 13-Oct-2013
- DOI: 10.15224/978-981-07-7965-8-61
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A SYSTEMATIC STRATEGY TO FIND THE NATURAL FREQUENCIES OF AN INDUSTRIAL ROBOT
Published In: INTERNATIONAL CONFERENCE ON ADVANCES IN MECHANICAL AND ROBOTICS ENGINEERING
Author(s): ALAA ABDULHADY JABER , ROBERT BICKER
Abstract: In order to design a reliable monitoring or control system for any machine, some characteristics of the machine have to be known, such as machine natural frequencies. In this paper, firstly static evaluation of the PUMA 560 robot, which has been used in this research study, when it is powered on, was accomplished. Then, the experimental modal analysis is performed to obtain the natural frequencies of the robot. Experimental modal analysis consist of: exciting the robot by hand held impact hammer, measuring frequency response function (FRF) between the excitation and a point on the robot, and then using software to find the natural frequencies. This analysis was conducted when the robot at four different configurations. Moreover, the explanation of the method and setup used for the experiments, which measurement equipment are used, and how FRFs are calculated will be presented in this paper. Finally, easy to follow strategy have been proposed to be used for modal analysis of different
- Publication Date: 13-Oct-2013
- DOI: 10.15224/978-981-07-7965-8-60
- Views: 0
- Downloads: 0