Analysis of the Relative Velocity and Its Influence on the Process Results in Unguided Vibratory Finishing

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Maximilian Lachenmaier ◽  
Richard Brocker ◽  
Daniel Trauth ◽  
Fritz Klocke
Keyword(s):  
Measurement System ◽  
Rotational Speed ◽  
Relative Velocity ◽  
Removal Rate ◽  
Electrical Power ◽  
Influence Factors ◽  
Major Influence ◽  
Vibratory Finishing ◽  
Camera System ◽  
The Media

The relative velocity between workpiece and media has a strong effect on the material removal rate in vibratory finishing. Due to this fact, a measurement system in the form of a camera-integrated workpiece is presented in this paper, which is capable of measuring the relative velocity between the workpiece and the media in an unguided vibratory finishing process. The unique feature of this measurement system is the completely wireless construction, so that the results are not influenced by wires for the data transfers and the electrical power supply of the light-emitting diodes of the camera system. Furthermore, the influence of the media size and adjustments of the imbalance engine like rotational speed, mass distribution between the upper and the lower imbalance weights, and offset angle between the imbalance weights were investigated. The evaluation of the results has shown that the media size and the rotational speed of the imbalance engine are the major influence factors on the relative velocity between workpiece and media.

Contact Forces in Unguided Vibratory Finishing

2015 ◽  
Author(s):  
Richard Brocker ◽  
Frederik Vits ◽  
Patrick Mattfeld ◽  
Fritz Klocke
Keyword(s):  
Measurement System ◽  
Removal Rate ◽  
Electrical Power ◽  
Force Sensor ◽  
Contact Forces ◽  
Work Piece ◽  
Data Logging ◽  
Vibratory Finishing ◽  
Revolution Speed ◽  
Finishing Processes

In vibratory finishing the material removal rate is influenced by the contact forces between work piece and media. In this paper a measurement system is presented which is capable of measuring the contact forces between work piece and media in unguided vibratory finishing. The unique feature of the measurement system is its completely wireless construction. The measurement results are not influenced by wires of the force sensor system including the electrical power supply and the data logging. By means of this measurement system, contact forces can be measured in unguided vibratory finishing processes for the first time. Furthermore, the influence of media size and adjustment of the unbalance motor like revolution speed, phase angle and mass distribution between the upper and the lower eccentric weight was investigated.

Kontaktkräfte beim ungeführten Vibrationsgleitschleifen*/Contact forces in unguided vibratory finishing

2015 ◽  
Vol 105 (06) ◽  
pp. 377-383
Author(s):  
F. Klocke ◽  
R. Brocker ◽  
F. Vits ◽  
P. Mattfeld
Keyword(s):  
Measurement System ◽  
Electrical Power ◽  
Force Sensor ◽  
Contact Forces ◽  
Work Piece ◽  
Data Logging ◽  
Vibratory Finishing ◽  
Revolution Speed ◽  
Measurement Results ◽  
Finishing Processes

Beim Vibrationsgleitschleifen wird der Werkstoffabtrag maßgeblich durch die vorherrschenden Kontaktkräfte zwischen dem Werkstück und den Schleifkörpern bestimmt. Dieser Fachartikel stellt ein Messsystem vor, mit dem die messtechnische Erfassung der Kontaktkräfte beim ungeführten Vibrationsgleitschleifen möglich ist. Ein Alleinstellungsmerkmal ist dabei die vollständig kabellose Ausführung des Messsystems. Somit wurden die Messergebnisse nicht durch Kabel beeinflusst, die üblicherweise für die Energieversorgung und Datenübertragung notwendig sind. Mithilfe dieses Messsystems wurde der Einfluss folgender Prozesseingangsgrößen systematisch untersucht: Schleifkörpergröße, Unwuchtmotordrehzahl, Versatzwinkel der Unwuchtgewichte sowie die Masse des unteren und oberen Unwuchtgewichts auf die Kontaktkräfte.   In vibratory finishing the material removal is influenced by the contact forces between work piece and media. In this paper a measurement system is presented which is able to measure contact forces between work piece and media in unguided vibratory finishing. The unique feature of the measurement system is its completely wireless construction so that the measurement results are not influenced by wires of the force sensor system including the electrical power supply and the data logging. By means of this measurement system, contact forces can be measured in unguided vibratory finishing processes for the first time. Furthermore, the influence of media size and adjustment of the unbalance motor like revolution speed, phase angle and mass distribution between the upper and the lower eccentric weight on the contact forces was investigated.

Study on Drilling Characteristics of Supper Alloy GH3039

2014 ◽  
Vol 800-801 ◽  
pp. 119-123 ◽  
Author(s):  
Xue Hui Wang ◽  
Can Zhao ◽  
Yan Yan Guo ◽  
Ming Jun Feng
Keyword(s):  
Removal Rate ◽  
Aerospace Industry ◽  
Influence Factors ◽  
Spindle Speed ◽  
Major Influence ◽  
Drilling Process ◽  
Single Factor ◽  
Drilling Force ◽  
Serrated Chip ◽  
Speed Up

This paper explores the drilling characteristics of GH3039 supper alloy. The machining of GH3039 is a difficulty which is commonly used in aircraft and engineer components of the aerospace industry. The spindle speed and feed per tooth are the major influence factors which are studied to gain large removal rate and predict the drilling characteristics. So the single factor test is carried out about spindle speed and feed per tooth. The results of the experiment show that the drilling force of GH3039 decreased with the increasing of spindle speed up to 900r/min which is larger than other metal drilling process. The small feed per tooth may obtain small drilling force. So too low spindle speed and large feed per tooth are not adopted in the GH3039 drilling process. The analysis of the chip formation also verifies the above characteristics. At the same time, the serious serrated chip is occurred which is adverse for the drilling. It has significant for other supper alloy real drilling process.

Automatisierte Werkzeugverschleißmessung beim robotergeführten Gleitschleifen/Process monitoring with object detection Automated tool wear measurement in robotguided drag finishing

2020 ◽  
Vol 110 (09) ◽  
pp. 608-612
Author(s):  
Marco Kopp ◽  
Eckart Uhlmann
Keyword(s):  
Tool Wear ◽  
Object Detection ◽  
Process Monitoring ◽  
Measurement System ◽  
Automated Measurement ◽  
Vibratory Finishing ◽  
The Media ◽  
Automated Processes ◽  
Drag Finishing ◽  
Automated Tool

Die Werkzeuge beim Gleitschleifen sind Schleifkörper. Infolge ihrer Nutzung verschleißen die Schleifkörper, wodurch ihr Einsatzverhalten verändert wird. Zur Aufrechterhaltung gleichbleibender Bearbeitungsergebnisse sollte der Verschleißzustand daher regelmäßig überprüft und Schleifkörper gegebenenfalls gewechselt werden. In diesem Beitrag wird das Konzept eines Messsystems zur automatisierten Messung des Schleifkörperverschleißes vorgestellt. Der Einsatz des Messsystems kann zur Erhöhung des Automatisierungsgrades und somit der Wirtschaftlichkeit von industriellen Gleitschleifbearbeitungen beitragen. Insbesondere gilt dies für vollautomatisierte Prozesse wie dem robotergeführten Gleitschleifen.   In vibratory finishing abrasive media is used as tools. Due to the use the abrasive media wears, which changes the performance of the media. To maintain consistent finishing results, the state of wear should therefore be monitored and media should be replaced if necessary. In this paper the concept of a measurement system for automated measurement of media wear is presented. The use of the measurement system can contribute to increase the degree of automation and thus the profitability of industrial vibratory finishing operations. In particular this applies for fully automated processes like the robot-guided drag finishing.

Impact of Social Media on English Language: A Review

2015 ◽  
Vol 3 (3) ◽  
pp. 5
Author(s):  
Dr. Neha Sharma
Keyword(s):  
Social Media ◽  
Cultural Values ◽  
English Language ◽  
Major Influence ◽  
International Level ◽  
Class Society ◽  
The World ◽  
The Status ◽  
The Media ◽  
Subsequent Rise

Language being a potent vehicle of transmitting cultural values, norms and beliefs remains a central factor in determining the status of any nation. India is a multilingual country which tends to encourage people to use English at national and international level. Basically English in India owes its presence to the British but its subsequent rise is not fully attributable to the British. It has now become the language of wider communication which is now spoken by large number of people all over the world. It is influenced by many factors such as class, society, developments in science and technology etc. However the major influence on English language is and has been the media.

Algicidal and Bactericidal Effect of Potassium Monopersulfate Compound on Eutrophic Water

2014 ◽  
Vol 707 ◽  
pp. 259-262 ◽  
Author(s):  
Ming Song Wu ◽  
Xin Yang Xu ◽  
Xun Xu ◽  
Yue Ting Zeng ◽  
Jing Nan Zhang ◽  
...  
Keyword(s):  
Contact Time ◽  
Influence Factors ◽  
Bactericidal Effect ◽  
Major Influence ◽  
Treatment Efficiency ◽  
Compound A ◽  
Eutrophic Water ◽  
Landscape Water ◽  
Algae And Bacteria

Algae and bacteria blooms in eutrophication in summer have made the quality of landscape water degradation. Treatment efficiency of potassium monopersulfate compound, a new kind of oxidation reagent, on killing algae and bacteria has been valued and the effect of influence factors, such as dosage, contact time and temperature are also discussed. The results indicated that potassium monopersulfate is appropriate for killing algae and bacteria in landscape water, dosage and contact time are the major influence factors. The contact time should be longer than 20min and the algicidal rate is higher when the temperature is above 20°C.

Experiment and Optimization of High-Efficiency Mechanical Separation of Peanut Seedlings and Residual Film Based on Suspension Velocity

2021 ◽  
Vol 64 (4) ◽  
pp. 1381-1389
Author(s):  
Fengwei Gu ◽  
Meng Yang ◽  
Zhichao Hu ◽  
Yanhua Zhang ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Moisture Content ◽  
Rotational Speed ◽  
Loss Rate ◽  
Removal Rate ◽  
Performance Tests ◽  
Test Results ◽  
Material Loss ◽  
Validation Test ◽  
Residual Film ◽  
Forage Utilization

HighlightsAn efficient method for separating peanut seedlings and residual film harvested from film-mulched peanut was proposed, and the mechanism was optimized.The relationships between the suspension velocity and moisture content of different shredded materials were studied.Four-factor, three-level Box-Behnken experiments were carried out and analyzed, and the optimal parameter combination was determined.A validation test was carried out to verify the rationality and accuracy of the optimized regression model.Abstract. To address the problems of lower residual film removal and higher material loss in the forage utilization of peanut seedlings wrapped in residual film, this study explored the relationships between the suspension velocity and moisture content of different shredded materials derived from peanut seedlings and conducted performance tests and parameter optimization for a machine that uses peanut seedlings as forage material. Four-factor, three-level Box-Behnken experiments were designed using the rotational speeds of the shredding shaft, upper fans, and lower fans and the frequency of the vibrating sieve as test factors, and using the residual film removal rate and material loss rate as response values. The test results indicated that the suspension velocity of the shredded materials showed a quadratic relationship with moisture content. The performance tests showed that the significance sequence of the test factors for the residual film removal rate was: rotational speed of the lower fans, rotational speed of the upper fans, rotational speed of the shredding shaft, and frequency of the vibrating sieve. The significance sequence for the material loss rate was: rotational speed of the lower fans, rotational speed of the shredding shaft, frequency of the vibrating sieve, and rotational speed of the upper fans. The parameter optimization and validation test showed that the residual film removal rate was 92.71% and the material loss rate was 8.19% when the rotational speeds of the shredding shaft, upper fans, and lower fans were 1650, 770, and 665 rpm, respectively, and the frequency of the vibrating sieve was 4 Hz. The relative errors between the validation test results and the predicted values from the regression models were less than 3%, which suggests that the regression models are reliable. This study provides a reference for the forage utilization of peanut seedlings harvested from film-mulched peanut and provides a reference for determining the optimal working parameters of forage processing machines. Keywords: Agricultural machinery, Box-Behnken experiment, Optimization, Peanut film-seedling separation, Suspension velocity.

A New Heat Transfer Correlation for Supercritical RP-3 Flowing in Vertical Tubes

2017 ◽  
Author(s):  
Longyun Wang ◽  
Zhi Tao ◽  
Jianqin Zhu ◽  
Haiwang Li ◽  
Zeyuan Cheng
Keyword(s):  
Heat Transfer ◽  
Influence Factors ◽  
Hydrocarbon Fuel ◽  
Operating Conditions ◽  
Major Influence ◽  
Absolute Deviation ◽  
New Correlation ◽  
Vertical Tubes ◽  
Correction Terms ◽  
Good Agreement

A new empirical correlation for upward flowing supercritical aviation kerosene RP-3 in the vertical tubes is proposed. In order to obtain the database, numerical simulation with a four-component surrogate model on RP-3 and LS low Reynolds turbulence model in vertical circular tube has been performed. Tubes of diameter 2mm to 10mm are studied and operating conditions cover pressure from 3MPa to 6MPa. Heat flux is 500KW/m2, mass flow rate is 700kg/(m2·s). The numerical results on wall temperature distribution under various conditions are compared with experimental data and a good agreement is achieved. The existing correlations are summarized and classified into three categories. Three representative correlations of each category are selected out to evaluate the applicability in heat transfer of supercritical RP-3. The result shows that correlations concluded from water and carbon-dioxide do not perform well in predicting heat transfer of hydrocarbon fuel. The mean absolute deviation of them is up to 20% and predict about 80% of the entire database within 30% error bands. So a new correlation which is applicable to different working conditions for supercritical RP-3 is put forward. Gnielinski type has been adapted as the basis of the new correlation for its higher accuracy. In consideration of major influence factors of supercritical heat transfer, correction terms of density and buoyancy effect are added in. The new correlation has a MAD of 9.26%, predicting 90.6% of the entire database within ±15% error bands. The comparisons validate the applicability of the new correlation.

Influence Factors of Denitration Study on Catalyst Mn-Ce/TiO2

2013 ◽  
Vol 634-638 ◽  
pp. 526-530
Author(s):  
Chun Xiang Geng ◽  
Qian Qian Chai ◽  
Wei Yao ◽  
Chen Long Wang
Keyword(s):  
Reaction Temperature ◽  
Catalytic Reduction ◽  
Removal Rate ◽  
Load Capacity ◽  
Fixed Bed ◽  
Influence Factors ◽  
Space Velocity ◽  
Molar Ratio ◽  
Impregnation Method ◽  
Ammonia Gas

Selective Catalytic Reduction (SCR) processes have been one of the most widely used denitration methods at present and the property of low tempreture catalyst becomes a hot research. The Mn-Ce/TiO2 catalyst was prepared by incipient impregnation method. The influence of load capacity, reaction temperature, O2 content, etc. on denitration were studied by a fixed bed catalyst reactor with ammonia gas. Results showed that catalyst with load capacity 18% performed high NO removal rate of 90% at conditions of reaction temperature 160°C, low space velocity, NH3/NO molar ratio 1: 1, O2 concentration 6%.

scholarly journals Riemannian Spatio-Temporal Features of Locomotion for Individual Recognition

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 56 ◽  
Author(s):  
Jianhai Zhang ◽  
Zhiyong Feng ◽  
Yong Su ◽  
Meng Xing ◽  
Wanli Xue
Keyword(s):  
Riemannian Manifold ◽  
Individual Recognition ◽  
Metric Learning ◽  
Influence Factors ◽  
Feature Representation ◽  
Geometric Feature ◽  
Major Influence ◽  
Temporal Features ◽  
Spatio Temporal ◽  
Spatial State

Individual recognition based on skeletal sequence is a challenging computer vision task with multiple important applications, such as public security, human–computer interaction, and surveillance. However, much of the existing work usually fails to provide any explicit quantitative differences between different individuals. In this paper, we propose a novel 3D spatio-temporal geometric feature representation of locomotion on Riemannian manifold, which explicitly reveals the intrinsic differences between individuals. To this end, we construct mean sequence by aligning related motion sequences on the Riemannian manifold. The differences in respect to this mean sequence are modeled as spatial state descriptors. Subsequently, a temporal hierarchy of covariance are imposed on the state descriptors, making it a higher-order statistical spatio-temporal feature representation, showing unique biometric characteristics for individuals. Finally, we introduce a kernel metric learning method to improve the classification accuracy. We evaluated our method on two public databases: the CMU Mocap database and the UPCV Gait database. Furthermore, we also constructed a new database for evaluating running and analyzing two major influence factors of walking. As a result, the proposed approach achieves promising results in all experiments.

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