Low Cost Experimental Vibration Analysis of a Cantilever Beam Under Base Excitation

2014 ◽  
Author(s):  
Pezhman A. Hassanpour ◽  
Andrea J. Helmns
Keyword(s):  
Cantilever Beam ◽  
Vibration Analysis ◽  
Low Cost ◽  
Low Frequency ◽  
Video Camera ◽  
Base Excitation ◽  
Image Processing Techniques ◽  
Digital Video Camera ◽  
Processing Techniques ◽  
Dimensionless Formulation

This paper presents the investigation of operational deflection shapes of vibration of a cantilever beam using a low-cost digital video camera, and by application of image processing techniques. The beam is uniform and under base excitation. The analytical model of the system is developed using dimensionless formulation. The analytical ODS’s are derived, and then compared with those found from experiment. The significance of this research is that it provides the researchers an inexpensive alternative tool for investigating the behavior of systems with low-frequency dynamics.

A Platform for Measuring the Response Time of Smartphones

2019 ◽  
Vol 63 (5) ◽  
pp. 50403-1-50403-15
Author(s):  
Edward T.-H. Chu ◽  
Heng-Chih Hsieh
Keyword(s):  
Response Time ◽  
Social Networking ◽  
User Experience ◽  
Graphical User Interface ◽  
Response Times ◽  
Low Cost ◽  
Mobile App ◽  
Image Processing Techniques ◽  
Processing Techniques ◽  
Share Information

Abstract Smartphones are playing an increasingly important role in helping people share information and communicate with each other, as evidenced by an increasing number of applications (or apps), including news, search engine, mailbox, and social networking apps. The more heavily people rely on their phones, the more they begin to take the term “user experience” into consideration when buying a smartphone. Obviously, the key to providing a good user experience is to minimize the response time of each graphical user interface (GUI) operation, such as a touch, slide, or flick. Thus, it is crucial for smartphone manufacturers and mobile app developers to measure the response times to enhance the performance of the device or application. In this article, the authors present the SMArtphone Response Time measuring platform (SMART), a novel and low-cost platform for measuring the response time of a smartphone. SMART consists of a normal 30-fps (frame per second) webcam and a mirror. The proposed platform first simultaneously records the changes on a smartphone screen and the GUI operation shown in the mirror. It then adopts image processing techniques to analyze the latency of the GUI operation. The authors’ validation results show that the measurement error of SMART is less than 1/30 s, which means that SMART is a practical solution for measuring the latency of GUI operations. In addition, they adopted SMART for the measurements and analysis of six different commercial smartphones to further demonstrate its applicability.

scholarly journals On the Estimation of the Surface Elevation of Regular and Irregular Waves Using the Velocity Field of Bubbles

2020 ◽  
Vol 8 (2) ◽  
pp. 88 ◽  
Author(s):  
Diana Vargas ◽  
Ravindra Jayaratne ◽  
Edgar Mendoza ◽  
Rodolfo Silva
Keyword(s):  
Time Series ◽  
Free Surface ◽  
High Speed ◽  
Low Cost ◽  
Video Camera ◽  
Surface Elevation ◽  
Irregular Waves ◽  
Air Bubbles ◽  
Digital Video Camera ◽  
Wave Heights

This paper describes a new set of experiments focused on estimating time series of the free surface elevation of water (FSEW) from velocities recorded by submerged air bubbles under regular and irregular waves using a low-cost non-intrusive technique. The main purpose is to compute wave heights and periods using time series of velocities recorded at any depth. The velocities were taken from the tracking of a bubble curtain with only one high-speed digital video camera and a bubble generator. These experiments eliminate the need of intrusive instruments while the methodology can also be applied if the free surface is not visible or even if only part of the depth can be recorded. The estimation of the FSEW was successful for regular waves and reasonably accurate for irregular waves. Moreover, the algorithm to reconstruct the FSEW showed better results for larger wave amplitudes.

Remote Sensing of Bridge Displacement Using Digital Image Processing Techniques

2006 ◽  
Vol 321-323 ◽  
pp. 404-409 ◽  
Author(s):  
Jong Jae Lee ◽  
Masanobu Shinozuka ◽  
Soo Jin Cho
Keyword(s):  
Image Processing ◽  
Real Time ◽  
Digital Image Processing ◽  
Digital Image ◽  
Shaking Table Test ◽  
Field Tests ◽  
Video Camera ◽  
Shaking Table ◽  
Image Processing Techniques ◽  
Processing Techniques

In this study, an optical method of real-time displacement measurement of such bridges was carried out by means of digital image processing techniques. A commercially available digital video camera combined with a telescopic device takes a motion picture of the target panel with known geometry, which is installed on the measurement location of a bridge. The displacement of the target is calculated based on the captured images in real-time manner using image processing techniques, which require a texture recognition algorithm, projection of the captured image, and calculation of the actual displacement using target geometry and number of pixels moved. For the purpose of verification of the presented method, a laboratory test was made using shaking table test and the measured displacement by image processing techniques was compared with the data from a contact-type sensor, a linear variable differential transformer (LVDT). The proposed method gave close results to a conventional sensor. Field tests were carried out on a bridge with steel plate girders and a bridge with steel box girders. The test results gave sufficient dynamic resolution in frequency as well as the amplitude.

scholarly journals An Innovative Approach to Build a Low Cost Braille Embosser

2020 ◽  
pp. 823-826
Author(s):  
Vaibhavi Naik ◽  
Amey Joshi ◽  
Ritesh Gupta ◽  
Kaustubha Pavaskar ◽  
Prajakta Tanksali
Keyword(s):  
Visually Impaired ◽  
Low Cost ◽  
Normal Person ◽  
Text File ◽  
Image Processing Techniques ◽  
Visually Impaired People ◽  
Impaired People ◽  
Processing Techniques ◽  
Reading Interest ◽  
Maximum Content

Visually impaired people have to deal with various challenges since they cannot see anything with their eyes and even some visually impaired people are not able to read the content of their interest so they fail to gain knowledge from reading as much as a normal person can obtain. Visually impaired people have some content available in the braille format that they can read but not all content of their reading interest is available in the braille format. Therefore, braille embosser will help to make available the maximum content of their reading interest in the braille format at an affordable cost. In this project, the user will have to upload an image of blinds reading interest, which is to be converted in the braille format. Initially, we will extract the text from a text image and save the text file using different image processing techniques. Then each character stored in the text file will be converted to the respective braille format using ASCII values and then converted text will be embossed using the braille embosser, which will make the content available for the blind community.

scholarly journals Calibration of tri-axial MEMS accelerometers in the low-frequency range – Part 2: Uncertainty assessment

2018 ◽  
Vol 7 (1) ◽  
pp. 403-410 ◽  
Author(s):  
Giulio D'Emilia ◽  
Antonella Gaspari ◽  
Fabrizio Mazzoleni ◽  
Emanuela Natale ◽  
Alessandro Schiavi
Keyword(s):  
Low Cost ◽  
Low Frequency ◽  
Uncertainty Assessment ◽  
Field Application ◽  
Geometrical Parameters ◽  
Innovative Methods ◽  
Reference Motion ◽  
Different Types ◽  
Range Part ◽  
Processing Techniques

Abstract. A comparison among three methods for the calibration of tri-axial accelerometers, in particular MEMS, is presented in this paper, paying attention to the uncertainty assessment of each method. The first method is performed according to the ISO 16063 standards. Two innovative methods are analysed, both suitable for in-field application. The effects on the whole uncertainty of the following aspects have been evaluated: the test bench performances in realizing the reference motion, the vibration reference sensor, the geometrical parameters and the data processing techniques. The uncertainty contributions due to the offset and the transverse sensitivity are also studied, by calibrating two different types of accelerometers, a piezoelectric one and a capacitive one, to check their effect on the accuracy of the methods under comparison. The reproducibility of methods is demonstrated. Relative uncertainty of methods ranges from 3 to 5 %, depending on the complexity of the model and of the requested operations. The results appear promising for low-cost calibration of new tri-axial accelerometers of MEMS type.

Image Processing Methodology for Determining SI Precipitate Size and Density in Oxide Layers from Conical Dark Field TEM Micrographs

2001 ◽  
Vol 7 (S2) ◽  
pp. 832-833
Author(s):  
A. Domenicucci
Keyword(s):  
Image Processing ◽  
Low Cost ◽  
Dark Field ◽  
Precipitate Size ◽  
Second Phase ◽  
Oxide Breakdown ◽  
Image Processing Techniques ◽  
Transmission Electron ◽  
The Matrix ◽  
Processing Techniques

Image processing techniques have been used for decades in many branches of science. with the advent of low cost, highresolution CCD cameras and the advances in personal computing, techniques previously used in other disciplines are increasingly being applied by transmission electron microscopists. The present paper gives an example of using image processing techniques for characterizing the number and size of second phase precipitates in an oxide matrix.Si inclusions in the form of Si precipitates can occur in silicon dioxide films. The inclusions are contained within the films and effectively reduce the local thickness of the oxide. This thinning results in a reduction in the voltage necessary to cause oxide breakdown; the larger is the precipitate, the lower the breakdown voltage. Knowledge of the precipitate size and density is therefore important when assessing the dielectric integrity of these films. The Si precipitates are crystalline and more or less randomly oriented within the matrix.

Experimental Investigation of Mixture Formation and Flame Development Using the Basics Technique of Schlieren Optical Visualization Principle

2014 ◽  
Vol 660 ◽  
pp. 474-478
Author(s):  
Dahrum Samsudin ◽  
Safwan Othman ◽  
M.D. Anuar ◽  
Bukhari Manshoor ◽  
Amir Khalid
Keyword(s):  
Low Cost ◽  
Combustion Process ◽  
Video Camera ◽  
Combustible Mixture ◽  
Biodiesel Fuel ◽  
Mixture Formation ◽  
Digital Video Camera ◽  
Optical Visualization ◽  
Flame Development ◽  
Air Mixing

The Schlieren technique remains to be one of the most powerful technique to visualize the flow and it is relatively easy to implement, high and variable sensitivity, low cost and its used conventional of light. This technique allows us to see the invisible of the optical inhomogeneities in transparent media like air, water and glass that otherwise cause only ghostly distortions of our normal vision. This research investigates the mixture formation and flame development of biodiesel fuel using the Schlieren optical visualization principle. This method can capture spray evaporation, spray interference, mixture formation and flame pattern clearly with real images. During the experiment, the camera lens was used with telephoto lenses (Nikon 70-300mm f/4-5.6G) in order to capture a large amount of light especially the low flame intensity during the initial flame development. The flame development was captured with color images from a color digital video camera. This method can capture the flow of fluids of varying density, such as spray evaporation, spray interference and mixture formation clearly with real images. The result shows that the mechanism of fuel-air mixing and a better comprehension of combustible mixture that can give valuable information to improve and optimize the combustion process.

scholarly journals Low cost blood vein detection system based on near-infrared LEDs and image-processing techniques

2020 ◽  
Vol 26 (2) ◽  
pp. 61-67
Author(s):  
Mohammed J. Alwazzan
Keyword(s):  
Image Processing ◽  
Near Infrared ◽  
Detection System ◽  
Low Cost ◽  
Ccd Camera ◽  
Accurate Identification ◽  
Image Processing Techniques ◽  
A Charge ◽  
Processing Techniques ◽  
Palm Of The Hand

AbstractDrawing blood and injecting drugs are common medical procedures, for which accurate identification of veins is needed to avoid causing unnecessary pain. In this paper, we propose a low-cost system for the detection of veins. The system emits near-infrared radiation from four light-emitting diodes (LEDs), with a charge-coupled device (CCD) camera located in the middle of the LEDs. The camera captures an image of the palm of the hand. A series of digital image-processing techniques, ranging from image enhancement and increased contrast to isolation using a threshold limit based on statistical properties, are applied to effectively isolate the veins from the rest of the image.

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