DESIGN OF ILST - BPPT WIND TUNNEL CALIBRATION MODEL BASED ON ASME Y14.5

• Main Author: Rahmadhi Hidayat, Arif
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/49449
• Institution: Institut Teknologi Bandung

The wind tunnel is a large tubular with a controlled stream of air blowing through it. The tunnels are used to replicate the action of an object flying through the air or moving along the ground and study the effects of movement through air or resistance to moving air on it. The accuracy and precision of the wind tunnel test results are very influential on the quality of the flow.In order to recognize the quality flow in wind tunnel, it is necessary to periodicaly conduct a calibration process with accurate and consistent flow quality measurements. The wind tunnel calibration process can utilize a model that is designed with aerodynamic parameter as simple as possible. In order to guarantee the data’s accuracy and precision in each calibration process, the test model should be compatible with predetermined product spesifications. The product specifications of ILST-BPPT calibration test model are referred to a book entitled “Low Speed Wind Tunnel Testing”. Furthermore, repeatability and accuracy of position in each component assembly must be proven. The geometric change of test model influences the aerodynamic characteristics; therefore it can affect the accuracy and precision of the data. The purpose of this research is to discuss the way of making calibration design test model of wind tunnel based on geometry dimension and tolerance (GD&T). This research is expected to be able to guarantee assembly and accuracy of each posisition. Thus, specification of the product can be accomplished. The reference standard used in the analysis of geometry dimensions and tolerances is ASME Y14.5-2009 The dimension and tolerance analysis were done by determination of size, shape, orientasion, and location of geometry feature in each product component. This analysis can be used for drawing interpretation uniformity and to streamline cost during the assembly process. The dimension and tolerance analysis only discussed the component which has the biggest deviation, that was interface of wing with fuselage components. The fabrications and measurements in this research was only conducted upon that component. Fabrication was conducted by using Computer Numerical Control (CNC) three axis machines. While the measurements was conducted by using Coordinate Measuring Machine (CMM).Measurement aims to validate the fabrication result with the design that has made, and to find out the size of the deviation that occurs.