scholarly journals Rapid Diagnostic Test of Metal Turning Using Vibration Parameters Analysis

2021 ◽  
Vol 24 (4) ◽  
pp. 18-28
Author(s):  
E. V. Artamonov ◽  
D. V. Vasil'yev ◽  
V. V. Voronin
Keyword(s):  
Spectral Analysis ◽  
Cutting Tool ◽  
Spectral Composition ◽  
Vibration Acceleration ◽  
Tool Holder ◽  
Operational Diagnostics ◽  
Basic Parameters ◽  
Series Of Experiments ◽  
Scale Experiment ◽  
Vibration Parameters

Purpose of research. The work is devoted to the proof that the vibration of the cutting tool holder carries information about the current cutting force and the type of coming off chips, and the spectral analysis of vibration acceleration will allow to extract this information in full. Methods. The work logically substantiates a scientific assumption about the possibility of prompt diagnostics of the turning process by analyzing the vibration acceleration spectrum of the cutting tool holder. To confirm the consistency of the assumption, a full-scale experiment was carried out. Results. A series of experiments was carried out to register changes in the spectral composition of the vibration of the cutting tool. It has been proven that vibration really carries information about the basic parameters of the cutting process. Conclusion. Spectral analysis of vibration can become the basis for operational diagnostics of metal turning by cutting and form the basis of the Adaptive System for Controlling Cutting Conditions in numerically controlled machines.

scholarly journals Vibration Transmitted to the Human Body during the Patient’s Ride in a Wheelchair

2017 ◽  
Vol 42 (1) ◽  
pp. 137-148 ◽  
Author(s):  
Zygmunt Dziechciowski ◽  
Magdalena Kromka-Szydek
Keyword(s):  
Spectral Analysis ◽  
Human Body ◽  
The Body ◽  
Frequency Range ◽  
Vibration Acceleration ◽  
Surface Type ◽  
Wheelchair User ◽  
Vibration Parameters ◽  
Floor Surfaces ◽  
Insight Into

Abstract The study investigates the spectra of vibrations transmitted onto the body of a wheelchair user during the ride on typical floor surfaces in public buildings and in their vicinity. Three wheelchair types are considered in the study (universal and active ones). Selected factors are examined that determine the amplitude of vibration acceleration acting upon humans in the analysed frequency range (wheelchair type, user’s body mass, surface type). The spectral analysis gives an insight into some of the factors which lead to a change of the vibration parameters registered at the user’s seat.

NEW BIOLOGICAL PREPARATION FOR ALFALFA SILAGE MAKING

1970 ◽  
pp. 36-40
Author(s):  
V. P. Klimenko ◽  
V. М. Kosolapov ◽  
V. G. Kosolapova ◽  
К. Е. Yurtaeva
Keyword(s):  
Optimal Dose ◽  
Energy Value ◽  
New Development ◽  
Basic Parameters ◽  
Excess Moisture ◽  
Series Of Experiments ◽  
Alfalfa Silage ◽  
Biological Additive ◽  
Technical Centre ◽  
Nutrients Digestibility

The data on assessment the preservative action of new enzymatic multisystem in combination with bacterial silage additive Silzak at alfalfa ensiling are presented in this study. It is known that alfalfa is a nonensiling legume grass because of excess moisture, sugar deficit and high content of crude protein. The experiments on alfalfa ensiling were conducted with application the enzymatic multisystem FM-1 under laboratory and research-and-production conditions. The multisystem was developed by the specialists of science-and-technical centre «Lecbiotech» in cooperation with scientists of Williams Fodder Research Institute. The optimal dose of FM-1 application and its preservative effectiveness in comparison with chemical conservant were determined in technological experiments. Obtained silage was evaluated on basic parameters: nutrients and organic acids content, ammonia, active acidity. The influence of the tested biological additive on the nutrients digestibility and energy value of alfalfa silage was estimated in experiments with hog lambs. Total results have shown the efficiency of the new development. Lucerne silage, prepared with application of mixture FM-1 and Silzak, was characterized by the better parameters of nutrients digestibility and energy value than at using a chemical conservant AIV 3 plus. The optimal dose of enzymatic multisystem application, as 90 gram per ton of fresh plant mass, was determined in the series of experiments.

Low Cost Vibration Measurement and Optimization during Turning Process

2018 ◽  
Vol 1148 ◽  
pp. 103-108 ◽  
Author(s):  
N.V.S. Shankar ◽  
A. Gopi Chand ◽  
K. Hanumantha Rao ◽  
K. Prem Sai
Keyword(s):  
Surface Roughness ◽  
Cutting Tool ◽  
Low Cost ◽  
Machining Process ◽  
Vibration Measurement ◽  
Depth Of Cut ◽  
Turning Process ◽  
Taguchi Analysis ◽  
Series Of Experiments

During machining any material, vibrations play a major role in deciding the life of the cutting tool as well as machine tool. The magnitude acceleration of vibrations is directly proportional to the cutting forces. In other words, if we are able to measure the acceleration experienced by the tool during machining, we can get a sense of force. There are many commercially available, pre-calibrated accelerometer sensors available off the shelf. In the current work, an attempt has been made to measure vibrations using ADXL335 accelerometer. This accelerometer is interfaced to computer using Arduino. The measured values are then used to optimize the machining process. Experiments are performed on Brass. During machining, it is better to have lower acceleration values. Thus, the first objective of the work is to minimize the vibrations. Surface roughness is another major factor which criterion “lower is the better” applies. In order to optimize the values, a series of experiments are conducted with three factors, namely, tool type (2 levels), Depth of cut (3 levels) and Feed are considered (3 levels). Mixed level optimization is performed using Taguchi analysis with L18 orthogonal array. Detailed discussion of the parameters shall be given in the article.

Influence of Tool Holder Material on Interfacial, Insert and Tool Holder Temperatures During Turning Operation of Gray Iron

2012 ◽  
Author(s):  
Almir K. Kaminise ◽  
Gilmar Guimaraes ◽  
Marcio B. Da Silva
Keyword(s):  
Temperature Distribution ◽  
Carbon Steel ◽  
Cutting Tool ◽  
Gray Iron ◽  
Cutting Fluid ◽  
Interface Temperature ◽  
Turning Operation ◽  
Tool Holder ◽  
Cutting Insert ◽  
Thermocouple Method

Usually studies related to machining temperature consider a system comprised of workpiece, chip and cutting tool, the effect of tool holder material is not taken in account. However, due to its physical properties, the tool holder material, usually carbon steel, has effect in the dissipation of the heat generated. This work studies the effect of the tool holder material on the temperature distribution during the turning operation of gray iron using cemented carbide cutting tool and without cutting fluid. Five tool holders were manufactured from materials with different heat conductivity: carbon steel, stainless steel, titanium, copper and bronze. Temperatures in eight different positions in the tool holder and cutting insert were measured. The average temperature at the chip tool interface was also measured using the tool-work thermocouple method. The results showed that the measured chip tool interface temperature was less affected by the tool holder material, although the temperature distribution at the cutting tool is highly affected.

scholarly journals Short vowels of the Teleut language for F1 and F2 (experimental phonetic observation)

2019 ◽  
pp. 58-65
Author(s):  
A. A. Dobrinina
Keyword(s):  
Spectral Analysis ◽  
Computer Program ◽  
Frequency Response ◽  
Spectral Composition ◽  
Frequency Characteristics ◽  
Short Vowels ◽  
Audio Files

This article presents the results of work to determine the spectral composition of the vowels of the teleutian lan-guage, based on data obtained in the field. The recorder was recorded in mp3 format, the data was converted to wav format using Freemake Audio Converter, Audacity program was used in the processing of audio files, the computer program SpeechAnalyzer was used in the decoding and analysis of materials. On the basis of spectral analysis, the vocalism of the Teleut language was determined. However, because of the sig-nificant oppositions of phonemes are the contrasts in abilitanti / albilineans and the extent of the solution. There are three types of vowels that differ in a number. Consideration of the frequency characteristics of high formants shows that when pronouncing the vowels of the front row e, and, ö, ʏ there is a significant increase in frequencies in the upper part of the spectrum. The vowels of the back row o, y, on the contrary, are characterized by a significant decrease in the sec-ond formant. The vowels a and u at frequency response is somewhere in the middle.

scholarly journals Conceptional cutting tool design for internal thread turning

2020 ◽  
Vol 10 (2) ◽  
pp. 41-48
Author(s):  
Dániel Kiss ◽  
Gergő Mihályi
Keyword(s):  
Cutting Tool ◽  
Tool Design ◽  
Internal Thread ◽  
Grinding Process ◽  
High Pitch ◽  
Tool Holder ◽  
Thread Profile ◽  
Tool Profile ◽  
Conceptual Designs ◽  
Cutting Tool Design

This article describes the different machining methods of the ball nut thread. One of the disadvantages of machining high pitch ball nuts by grinding process is to produce a modified tool profile to avoid collisions between the tool holder and the workpiece. However, by using profiled lathe inserts, it is possible to produce the thread profile of the ball nut using turning technology. The applicability of the technology is verified by tooling and experimental machining based on conceptual designs, the results of which are described at the end of the article.

scholarly journals Pressure stress modeling on expanded polystyrene materials using genetic programming

2021 ◽  
Vol 1208 (1) ◽  
pp. 012013
Author(s):  
Ermin Bajramović ◽  
Bahrudin Hrnjica ◽  
Redžo Hasanagić ◽  
Emir Bajramović
Keyword(s):  
Genetic Programming ◽  
Product Quality ◽  
Mechanical Characteristics ◽  
Realistic Model ◽  
Expanded Polystyrene ◽  
Experimental Phase ◽  
Basic Parameters ◽  
Series Of Experiments ◽  
Pressure Stress ◽  
Very High

Abstract In the production of expanded polystyrene, the standards are very high in terms of thermal, fire, dimensional, and mechanical characteristics, because each of the characteristics is a condition for achieving quality that allows competitiveness in the market. To ensure high-quality products, it is necessary to achieve optimal performance and product quality through carefully adjusted input parameters of production. Since the production of expanded polystyrene is specific in several ways, an experimental study was conducted in which the basic parameters affecting product quality were detected and through which a series of experiments were performed to prove product quality. Experimental research for this work was conducted on three types of expanded polystyrene samples whose purpose is to insulate floors exposed to pressure. The samples were made of the same material of different densities and aging times for which the pressure stress at a deformation of 10% was tested. After the experimental phase, the modeling of the output parameters was performed. Modeling involved the development of a model that describes a given problem and the obtained modeled values were analyzed and compared with the experimental one. The modeling method used genetic programming using the GPdotNET software package. The goal of modeling with the GpdotNET tool is to obtain a realistic model that would give the value of the compression stress at a deformation of 10% as an output variable in materials made of expanded polystyrene.

An Experimental Study of the Effects That Change the Vibration Mode of Riser VIV

2011 ◽  
Author(s):  
Tomo Fujiwara ◽  
Shotaro Uto ◽  
Shigeo Kanada
Keyword(s):  
Large Scale ◽  
Vibration Mode ◽  
Periodic Variation ◽  
Critical Issue ◽  
Dynamic Variation ◽  
Strong Current ◽  
Safety And Reliability ◽  
Series Of Experiments ◽  
Deepwater Riser ◽  
Scale Experiment

In recent years, a number of deepwater development projects are running worldwide. As the water depth increases, safety and reliability of the riser is a critical issue. One of the most important matters is vortex-induced vibration (VIV). In the deepwater area with strong current, for example in the Gulf of Mexico, a riser pipe’s VIV motion changes continually due to the change of hydrodynamic conditions. In order to assess safety and reliability of deepwater riser, investigation of the dynamic variation of riser VIV is important. This paper deals with top tensioned riser. To clarify the phenomena of dynamic variation of the riser’s vibration mode, a large-scale experiment using a 28.5 m long model was carried out at the Deep Sea Basin of the National Maritime Research Institute in Japan. In this experiment, the model’s bottom end was fixed, while top end was connected to a tensioner. The current generating system was installed to make flow from water surface to about 5m in depth. A measurement of riser VIV motion in current condition was carried out by changing the model’s top tension from self-weight balanced condition to four times of the self-weight. Vibration mode widely changed from high mode of up to 15th to low mode of 5th. In order to investigate an influence of the change of vibration mode on the riser VIV motion, a series of experiments were conducted with the periodic variation of top tension. It was found that the traveling wave occurred from top to bottom end in a moment of vibration mode changed.

The RMS Characteristics of Acceleration and Force Signals Depending on Tool Wear in Stable Cutting

1999 ◽  
Author(s):  
Richard Y. Chiou ◽  
Y. K. Kwon ◽  
Steven Y. Liang
Keyword(s):  
Tool Wear ◽  
Random Vibration ◽  
Cutting Tool ◽  
Flank Wear ◽  
Mean Square ◽  
Test Results ◽  
Tool Holder ◽  
Theoretical Predictions ◽  
Acceleration Signals ◽  
Good Agreement

Abstract An analysis of the RMS (Root Mean Square) characteristics of fluctuating force and acceleration signals for a cutting tool engaged in a turning operation in the presence of wear flat on the tool flank is presented in this research. The RMS of acceleration and force signals obtained from experiments in stable cutting is compared with theoretical machining models due to the tool wear effect. The RMS is a measure of the energy, at the tool tip-workpiece interface along the flank, to the random vibration of the cantilever portion of the tool holder. Increasing flank wear results in an increasing stability and decreasing RMS in the thrust direction, dependent upon flank wear-land width. The RMS force and acceleration signals in machining is calculated by frequency band RMS method at the first natural frequency of the cantilever portion of the tool holder in the frequency domain. By reference to experimental evidence, the theoretical predictions show generally good agreement with test results.

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