An improved de Laval nozzle experiment

2021 ◽  
pp. 030641902110341
Author(s):  
Nicholas Goodman ◽  
Brian J Leege ◽  
Peter E Johnson
Keyword(s):  
Data Acquisition ◽  
Laval Nozzle ◽  
Flow Characteristics ◽  
Data Acquisition System ◽  
Isentropic Flow ◽  
Hands On ◽  
De Laval Nozzle ◽  
Physical Phenomena ◽  
The Impact ◽  
The Relationship

Exposing students to hands-on experiments has been a common approach to illustrating complex physical phenomena that have been otherwise modelled solely mathematically. Compressible, isentropic flow in a duct is an example of such a phenomenon, and it is often demonstrated via a de Laval nozzle experiment. We have improved an existing converging/diverging nozzle experiment so that students can modify the location of the normal shock that develops in the diverging portion to better understand the relationship between the shock and the pressure. We have also improved the data acquisition system for this experiment and explained how visualisation of the standing shock is now possible. The results of the updated system demonstrate that the accuracy of the isentropic flow characteristics has not been lost. Through pre- and post-laboratory quizzes, we show the impact on student learning as well.

scholarly journals Flight manoeuvring and safe flight visualization with the aid of wide-ranging scrutiny and automation software

2019 ◽  
Vol 272 ◽  
pp. 01021
Author(s):  
J V Muruga Lal Jeyan ◽  
Jency Lal ◽  
M Senthil Kumar ◽  
Arfaj Ahamed Anwar
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Display Module ◽  
Flight Data ◽  
Difficult Time ◽  
Standard Procedures ◽  
2D And 3D ◽  
The Impact ◽  
Graphical Presentation

This document guides to an efficient use of FDVCAS system. FDVCAS is a reconstruction, playback, interactive visualization tool, which collects, stores, processes, analyses and present the flight data in high fidelity graphical presentation in 2D and 3D format. It synchronizes and presents in both graphical and synthetic visual form to the extends of analysing the impact of the data on the system in 3D graphic animation. The existing process involves in capturing the data from different input sources and formats, analysing the features of the data monitoring is done manually in offline in a unsynchronized fashion, This is difficult, time consuming and requires highly skilled technical expertise as it is visualized in plain data form. The above standard procedures followed shall be integrated and automated with minimum intelligence to be built, in with the system. In order to analyse the flight data in a coherent way it is required to integrate both 2D and 3D form The proposed concept is the Development of a system with a single solution by providing data display, graphical charts and replay features with a sophisticated graphical user interface, which is super imposed on the outside window imagery. FDVCAS consists of Bypass data acquisition system, Outside Window Imagery (OWI) system with graphical analyser. Bypass data acquisition system receives data from aircraft recorder and transmits the data in engineering format to FDVCAS system. The OWI system has three main modules namely, 3D Visual module, GUI based Graphical analyser and Warning display module. The warnings and the graphical plots are super imposed on the 3D Visual.

Effect of Temperature on the Properties of High Pressure Die Casting

2010 ◽  
Vol 649 ◽  
pp. 473-479 ◽  
Author(s):  
Jenő Dúl ◽  
Richárd Szabó ◽  
Attila Simcsák
Keyword(s):  
High Pressure ◽  
Data Acquisition ◽  
Die Casting ◽  
Data Acquisition System ◽  
Effect Of Temperature ◽  
High Pressure Die Casting ◽  
Die Castings ◽  
Pressure Die Casting ◽  
The Relationship

Quality of high pressure die castings is influenced by a lot of factors. Among them, the most important ones are the melt-, and die temperatures. This paper shows a data acquisition system, developed for measuring the melt and die temperatures and the results of the temperature measurements obtained under variable conditions. Evaluation of the relationship between the interrelated temperatures and the casting properties is based on analyzing the structure of the castings.

EFFECT OF RAINFALL ON TRAFFIC FLOW CHARACTERISTICS DURING NIGHT TIME

2016 ◽  
Vol 78 (7-2) ◽  
Author(s):  
Nurul ‘Azizah Mukhlas ◽  
Nordiana Mashros ◽  
Othman Che Puan ◽  
Sitti Asmah Hassan ◽  
Norhidayah Abdul Hassan ◽  
...  
Keyword(s):  
Traffic Flow ◽  
Flow Characteristics ◽  
Mean Flow ◽  
Night Time ◽  
Lighting Condition ◽  
Adverse Weather ◽  
Traffic Flow Characteristics ◽  
Rural Highway ◽  
The Impact ◽  
The Relationship

Understanding traffic behavior for obtaining a smooth, safe and economical traffic operation requires a thorough knowledge of traffic flow parameters and their mutual relationships.Eventhough adverse weather can reduce traffic efficiencies, there are still questions to answer regarding the relationship between weather conditions and traffic flow at night. This paper presents an investigation of the rainfall effects to the traffic flow characteristics on atwo-lane rural highway during night time. The traffic data and corresponding rainfall data for uninterrupted road segment of Federal route 3 at Dungun, Terengganu were collected under road lighting condition during the north-east monsoon season. The effect of good weather condition, light rain, moderate rain and heavy rain conditions on speed, flow and density were quantified and compared. Results from the analysis indicate that mean speed, mean flow and mean density are reduced under various rainfall conditions. In general, the impact of good weather and various rainfall conditions on Greenshield’s fundamental traffic flow relationship have weak correlations except for the relationship between flow and density. The important points in the fundamental diagram derived from flow-density relationships indicated that critical density, maximum flow, critical speed, jam density and free flow speed of roadway all decrease as rainfall intensity increases. It can be concluded that traffic flow characteristics of two-lane rural highway in Terengganu are affected by rainfall conditions.

scholarly journals DESIGN OF FORCE MEASURING SYSTEM ON MAIN LANDING GEAR WEIGHT DROP TESTING MACHINE FOR THE APPLICATION OF LSU SERIES

2020 ◽  
Vol 18 (2) ◽  
pp. 159
Author(s):  
Yusuf Giri Wijaya ◽  
Abian Nurrohmad
Keyword(s):  
Data Acquisition ◽  
Reaction Force ◽  
Testing Machine ◽  
Data Acquisition System ◽  
Landing Gear ◽  
Load Cell ◽  
Acquisition System ◽  
Measuring System ◽  
Weight Drop ◽  
The Impact

In this research, the design of the force measuring system on main landing gear weight drop test for the LSU series that developed by LAPAN was carried out. The principle of this machine is to apply the load according to the weight of the aircraft on the main landing gear and drop it at a certain height assisted by the guiding rail. At the bottom of this machine there is a impact platform where each angle is mounted with a load cell that functions to measure the reaction force due to the impact of the main landing gear. In addition, there is a data acquisition system whose function is to process the output signal from load cell and display measurement data. The data acquisition system used consists of DAQ measurement hardware made by national instruments and LabVIEW software installed on a PC. The design of this testing tools aims to carry out a dynamic impact test on the main landing gear structure of the UAV. In this study, static calibration has also been successfully performed on the impact platform and shows consistent results for various test masses.

scholarly journals LabView and Connections with Third-Party Hardware

2021 ◽  
Author(s):  
Giuseppe Porzio
Keyword(s):  
Data Acquisition ◽  
Real World ◽  
Data Acquisition System ◽  
Third Party ◽  
System Control ◽  
System Software ◽  
Discrete Events ◽  
Software And Hardware ◽  
Open Source Hardware ◽  
Physical Phenomena

Data acquisition is a function that plays a fundamental role in the automatic supervision and system control, it combine the system (software and hardware) to the process to be controlled (real world). The field of application starts from research to automation, from industry to home automation, in practice everything that in some way must be performed without human supervision. Data acquisition systems are mainly used to measure physical phenomena such as: temperature, voltage, current, distance and pressure, shock and vibration, and displacement, RPM, angle and discrete events, weight. In order to measure it we need a DAQ, Data AcQuisition System, in this chapter we propose to use a cheap open source hardware: Arduino.

Noise and Finite Register Effects in Infrared Fourier Transform Spectroscopy

1976 ◽  
Vol 30 (5) ◽  
pp. 531-539 ◽  
Author(s):  
C. T. Foskett
Keyword(s):  
Fourier Transform ◽  
Data Acquisition ◽  
Fast Fourier Transform ◽  
Fourier Transform Spectroscopy ◽  
Noise Sources ◽  
Additional Noise ◽  
The Impact ◽  
The Relationship

Finite registers used in computations act as additional noise sources in infrared Fourier transform spectroscopy. The relationship between these noise sources and classical noise sources is examined. The impact of finite register lengths on data acquisition, computation of the fast Fourier transform (FFT), and post-FFT spectral manipulations leads to the conclusion that the minimum recommended register length is 27 bits.

Teaching Computer-Based Data Acquisition Through an Airfoil Experiment

1991 ◽  
Author(s):  
T. Gary Yip
Keyword(s):  
Data Acquisition ◽  
Mechanical Engineering ◽  
Engineering Students ◽  
Lift Coefficient ◽  
Data Acquisition System ◽  
Hands On ◽  
Computer Based ◽  
Basic Functions ◽  
The Subject ◽  
Basic Concepts

Abstract This paper describes a three-week long project for teaching microcomputer-based data acquisition. The project is part of a senior level laboratory course for mechanical engineering students at Santa Clara University. The subject of investigation is the lift coefficient of an airfoil. Students in groups of two carried out the project in three phases. The laboratory activities in each phase are designed to provide the students hands-on experience with the basic functions, hardware and software of a microcomputer-based data acquisition system. Typical results obtained by the students are presented. The project has been proved to be successful for the students to learn and practice the three basic concepts in data acquisition which are measurements, controls and programming.

scholarly journals The High-Speed Cascade Wind Tunnel at the Bundeswehr University Munich after a Major Revision and Upgrade

2021 ◽  
Vol 6 (4) ◽  
pp. 41
Author(s):  
Reinhard Niehuis ◽  
Martin Bitter
Keyword(s):  
Wind Tunnel ◽  
Data Acquisition ◽  
High Speed ◽  
Data Acquisition System ◽  
Test Facility ◽  
Measurement Equipment ◽  
Design Studies ◽  
Major Revision ◽  
Physical Phenomena ◽  
Oriented Research

Since its first operation in 1956 at DFL Braunschweig and after its movement to Munich, the High-Speed Cascade Wind Tunnel (HGK) at Bundeswehr University Munich is intensively used for fundamental and application-oriented research on aero-thermodynamics of turbomachinery bladings. Numerous systematic airfoil design studies were performed over the last decades. Thanks to the HGK facility, which enables thorough and detailed cascade testing at turbomachinery-relevant conditions, many of those airfoils for different purposes finally made it into turbomachinery applications. Nowadays, the HGK still provides very useful contributions to the understanding of the complicated flow in compressor and turbine bladings, and thereby extends the knowledge on relevant physical phenomena. As a consequence of the intense usage, this unique test facility was subject to a major revision and upgrade. The performed changes are presented within this paper including an overview on new capabilities in terms of the extended operating range, the data acquisition system, and the recently available measurement equipment.

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