Gas Hold-Up Profiles Determination by means of Ultrasonic Transducer

2014 ◽  
Vol 69 (8) ◽  
Author(s):  
Mohd Hafiz Fazalul Rahiman ◽  
Ruzairi Abdul Rahim ◽  
Herlina Abdul Rahim ◽  
Zulkarnay Zakaria ◽  
Muhammad Jaysuman Pusppanathan ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Ultrasonic Transducer ◽  
Liquid Column ◽  
Element Analysis ◽  
Storage Oscilloscope ◽  
Digital Storage ◽  
Digital Storage Oscilloscope ◽  
The Relationship ◽  
Signal Conditioning Circuit ◽  
Conditioning Circuit

This paper details a work carried out to measure gas hold-up profiles in a liquid column using a pair of ultrasonic transducer. The gas hold-up profiles from 1.85 mm to 7.7 mm diameter are of interest in this investigation. The measurement setup consist of ultrasonic transducer, an experimental column, signal conditioning circuit, and a digital storage oscilloscope. The experiment was conducted using several gas hold-up profiles and the relationship between the ultrasonic amplitude and the profile were deduced. A finite element analysis was carried out to further verify the results. This paper explains how one could use ultrasonic transducer to estimate the gas hold-up profiles in a liquid column.

scholarly journals Information Entropy- and Average-Based High-Resolution Digital Storage Oscilloscope

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Jun Jiang ◽  
Lianping Guo ◽  
Kuojun Yang ◽  
Huiqing Pan
Keyword(s):  
Data Fusion ◽  
Information Entropy ◽  
Signal To Noise Ratio ◽  
Sampling Rate ◽  
Storage Oscilloscope ◽  
Whole Process ◽  
Digital Storage ◽  
Gross Error ◽  
Digital Storage Oscilloscope ◽  
Sample Data

Vertical resolution is an essential indicator of digital storage oscilloscope (DSO) and the key to improving resolution is to increase digitalizing bits and lower noise. Averaging is a typical method to improve signal to noise ratio (SNR) and the effective number of bits (ENOB). The existing averaging algorithm is apt to be restricted by the repetitiveness of signal and be influenced by gross error in quantization, and therefore its effect on restricting noise and improving resolution is limited. An information entropy-based data fusion and average-based decimation filtering algorithm, proceeding from improving average algorithm and in combination with relevant theories of information entropy, are proposed in this paper to improve the resolution of oscilloscope. For single acquiring signal, resolution is improved through eliminating gross error in quantization by utilizing the maximum entropy of sample data with further noise filtering via average-based decimation after data fusion of efficient sample data under the premise of oversampling. No subjective assumptions and constraints are added to the signal under test in the whole process without any impact on the analog bandwidth of oscilloscope under actual sampling rate.

Dämpfungsschlitze in Kreissägeblättern*/Parametric FE analysis to identify the mode of action of damping slots in circular saw blades

2015 ◽  
Vol 105 (01-02) ◽  
pp. 41-46
Author(s):  
C. Birenbaum ◽  
U. Heisel ◽  
S. Weiland
Keyword(s):  
Finite Element Analysis ◽  
Thermal Expansion ◽  
Analytical Approach ◽  
Simulation Models ◽  
Fe Analysis ◽  
Element Analysis ◽  
Annular Plates ◽  
Circular Saw ◽  
Characteristic Modes ◽  
The Relationship

In Kreissägeblättern werden zur Verminderung von Schwingungen und zum Ausgleich thermischer Dehnungen sogenannte Dehnungs- und Dämpfungsschlitze eingebracht. Die Wirkungsweise der Schlitze auf die dynamischen Eigenschaften besteht einerseits in der Dämpfungswirkung sowie andererseits in der Modifikation der Schwingungseigenformen. Um Wirkmechanismen und Optimierungsmöglichkeiten zu identifizieren, werden in den hier vorgestellten Untersuchungen mithilfe der Finiten-Elemente-Methode (FEM) Analysen von Kreisscheiben mit einfachen Schlitzkonfigurationen durchgeführt. Hierdurch sollen Zusammenhänge einzelner Schlitzparameter mit den statischen und dynamischen Eigenschaften von Kreissägeblättern aufgezeigt werden. Zur Validierung des entwickelten Simulationsmodells dienen analytische Berechnungen.   To reduce vibrations and adjust for thermal expansion, so-called damping slots and expansion slots are applied to circular saw blades. The slots affect the dynamic behavior of the saw blades by damping the vibration and altering the characteristic modes and frequencies. An FE(Finite Element) analysis of annular plates with simple arrangements of damping and expansion slots is performed to identify the mechanisms and improvement opportunities. This allows determining the relationship between slot parameters and the static and dynamic qualities of circular saw blades. The developed simulation models are validated using an analytical approach.

Research on Deflection Analysis and Compensation Method of Ram of Boring and Milling Machining Center

2014 ◽  
Vol 633-634 ◽  
pp. 693-698
Author(s):  
Long Xin ◽  
Shi Chao Cui ◽  
Qi Lin Shu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Least Squares Method ◽  
Preliminary Calculation ◽  
Element Analysis ◽  
Object A ◽  
Machining Center ◽  
Deflection Analysis ◽  
Long Stroke ◽  
The Relationship

In this paper, the ram of boring and milling machining center is taken as the research object. A new method that hydraulic pull rods compensation is proposed to solve the problem of deformation compensation of long stroke ram of boring and milling machining center. Firstly, the method of finite element analysis is used to get the laws of ram deformation and the relationship curve between the ram deformation and the stroke of ram. Secondly, the preliminary calculation value of pull rods compensation force is derived based on the theoretical analysis of material mechanics. The relationship curve between compensation force and the stroke of ram is obtained by finite element analysis and polynomial least squares method. Finally, the analyzed results are as follows: the laws of ram deformation distribution is accurately predicted by the used method, the deflection error of the ram is well controlled,and the machining precision is significantly improved.

scholarly journals Detection of Skin Cancer using Optical Method

2019 ◽  
Vol 9 (2S2) ◽  
pp. 933-936
Keyword(s):  
Skin Cancer ◽  
Optical Method ◽  
Cancer Tissue ◽  
Storage Oscilloscope ◽  
Hazardous Chemical ◽  
Digital Storage ◽  
Nir Light ◽  
Skin Cancers ◽  
Digital Storage Oscilloscope ◽  
The One

Skin is the one of the most important organ present in our body that does some of the important functions like protection, temperature regulation etc. Due to some conditions, skin is affected by many abnormalities. The abnormalities may be smaller or larger, which depends on the damage caused to the skin. Some abnormalities of skin are irritations, allergic reactions, swelling etc. One of the most major problems that affect the skin completely is of skin cancer. Skin cancer is the most common type of cancer that affects the 40% of people in all over world. It may be caused due to several factors like genetic, working in hazardous chemical areas, exposure to sun, repeated X-ray exposures etc. All of these factors affects the skin and causes skin cancer. Skin biopsy is a major technique used at present to detect all types of skin cancers. As this biopsy method is invasive, and takes more time to check the cancer tissue, we are using this optical method for detection of skin cancer. Optical imaging is the upcoming technology that plays the major role in all fields. In this method Near Infra-Red (NIR) light source is passed into the affected skin region. The transimpedance amplifier is used to amplify the output from photodiodes. Then the output from the photodiodes is connected to the Digital Storage Oscilloscope (DSO) in which the waveform shows the variations due to skin cancer.

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