scholarly journals Improving Machining Accuracy for a Robotic Arm with Hybrid Kinematic Chains Based on Deformation Characteristics

2021 ◽  
Author(s):  
Longfei Sun ◽  
Binghao Wang ◽  
Shutao Huang ◽  
Jinquan Li ◽  
Lijin Fang
Keyword(s):  
Great Influence ◽  
Robotic Arm ◽  
Machining Accuracy ◽  
Influence Coefficient ◽  
Deformation Model ◽  
Deformation Characteristics ◽  
Kinematic Chains ◽  
Accuracy Requirement ◽  
Joint Deformation ◽  
Main Components

Abstract The joint deformation has great influence on machining accuracy for a robotic arm. In this paper, the deformation characteristics of the robotic arm with hybrid kinematic chains is investigated in order to improve its machining accuracy. Firstly, the deformation model of the joints has been established based on the Strain energy method and Castigliano theorem according to the robot structure. Secondly, the deformation influence coefficient (DIC) is defined to investigate the deformation influence of main components on the end-effector, and the deformation characteristics are evaluated by the simulation. Finally, a small size robotic arm prototype is established and robotic drilling comparative experiments are conducted. The theoretical and experiment results show that the machining method can be selected according to the DIC, which the force can be applied to the components with better stiffness. On the other hand, the deformation of driving components can also be reduced when the DIC cannot be adjusted to meet the accuracy requirement.

NC Machine Position Accuracy Testing and NC System Error Compensation Analysis

2011 ◽  
Vol 130-134 ◽  
pp. 2316-2320
Author(s):  
Ke Zhang ◽  
Zheng Xing Cui ◽  
Li Ya Gai ◽  
Peng Ge ◽  
Dong Gao Cai
Keyword(s):  
Error Compensation ◽  
Laser Interferometer ◽  
Machining Accuracy ◽  
Nc System ◽  
Accuracy Requirement ◽  
Position Accuracy ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Processing Accuracy ◽  
Modern Manufacturing

NC machine plays an irreplaceable role in the modern manufacturing because of its high machining processing accuracy, quality stable, flexibility. Through using the Renishaw ML10 laser interferometer detect the positioning accuracy and repositioning accuracy of X axis and Z axis of the HTC20 series of NC machine tools. According to the detection result compensate NC system to meet the machining accuracy requirement. The result shows that the error compensation of NC system is a effective method to improve the position accuracy of NC machine.

scholarly journals Calidad del servicio percibida por clientes de entidades bancarias de Castilla y León y su repercusión en la satisfacción y lealtad a la misma

2008 ◽  
pp. 105
Author(s):  
José Ángel Miguel Dávila ◽  
Marcela Flórez Romero
Keyword(s):  
Service Quality ◽  
New Technologies ◽  
Great Influence ◽  
Physical Structure ◽  
Structural Equations ◽  
Key Factors ◽  
Castilla Y Leon ◽  
Nuevas Tecnologías ◽  
Main Components ◽  
Structural Equations Model

El propósito de la investigación está enmarcado en el estudio de la calidad del servicio que prestan las entidades bancarias. El objetivo de la investigación ha sido el de identificar los factores que determinan la calidad del servicio que perciben los clientes de las entidades bancarias de Castilla y León, y de cómo la calidad influye en su satisfacción. Así mismo, se trata también de identificar cómo la satisfacción de los clientes por el servicio prestado afecta a su lealtad hacia la entidad.<br />Mediante un análisis factorial de componentes principales, se encontraron los factores que influyen en la calidad: i) aspectos físicos (estructura física, ubicación conveniente, equipamiento moderno, vigilancia, aspecto limpio, etc.); ii) aspectos de la prestación del servicio (operaciones y servicios convencionales que realiza y ofrece la entidad, confianza y conocimiento que transmite el personal, atención personalizada, tiempos de respuesta, reputación de la entidad); y iii) nuevas tecnologías (cajeros, Internet o banca telefónica). Posteriormente, los resultados del modelo de ecuaciones estructurales, muestran una gran influencia de los aspectos de la prestación del servicio en la calidad del servicio, así como la demostración de la calidad como antecedente de la satisfacción y la influencia que ejerce la calidad en la satisfacción y ésta en la lealtad del cliente a la entidad bancaria.<br /><br />The aim of this paper is to analyze the quality of the services offered by banking entities. The objective of the research has been to identify the key factors determining the service quality as perceived by the clients of banking entities in Castilla y León; it is important to note the way in which quality influences the customers' satisfaction. Others goals of the research focus on how the clients' satisfaction on the perceived service affects their loyalty to the entity.<br />Through a factor analysis of the main components, the key features influencing quality were found: i) physical aspects (physical structure, conveniente location, modern equipment, etc.), ii) aspects of service's performance (conventional operations and services which the bank offers and performs, personalized service, reputation of the entity, etc.), and iii) new technologies (cash dispenser, internet or phone banking). Afterwards, the results of the structural equations model indicate a great influence of the aspects of service's performance in the service quality. They also demonstrate that quality appears as an antecedent of satisfaction and that there is an influence of quality in satisfaction and of satisfaction in the loyalty of the customer to the banking entity.<br />

Analysis of Complex Kinematic Chains With Influence Coefficients

1959 ◽  
Vol 26 (2) ◽  
pp. 184-188
Author(s):  
J. Modrey
Keyword(s):  
Simultaneous Equations ◽  
Influence Coefficient ◽  
Complex Mechanism ◽  
Direct Process ◽  
Kinematic Chains ◽  
Influence Coefficients

Abstract Highly complex kinematic chains such as Fig. 1(c) can be analyzed by the use of simple vector equations involving influence coefficients. The influence-coefficient equations are related to superposition of simple kinematic chains. The technique for determining the necessary influence coefficients is one of sequentially setting all variables but one to zero and relaxing appropriate constraints to maintain mobility. This “zero-relax” process creates a series of mechanisms each simple enough to be solved by a direct process rather than by simultaneous equations. The analysis of the velocities and accelerations for these simpler mechanisms yields the influence coefficients of the related but more highly complex mechanism.

scholarly journals Usage of the influence coefficient during calculation of a nominal error of gas counters

2019 ◽  
Vol 298 ◽  
pp. 00009
Author(s):  
M.S. Ostapenko ◽  
M.A. Popova ◽  
A.M. Tveryakov
Keyword(s):  
Relative Error ◽  
Gas Flow ◽  
Oil And Gas ◽  
Great Influence ◽  
Operating Conditions ◽  
Effect Of Temperature ◽  
Influence Coefficient ◽  
Technical Documentation ◽  
Flow Meters ◽  
Influence Coefficients

In this paper, we evaluate the method of finding the relative error of gas flow meters taking into account the influence coefficients. A literature analysis was carried out, which showed that flow meters are used at oil and gas enterprises, which show its metrological characteristic, showing specific values of gas flow in operating conditions. Various types of gas flow meters are considered, with a description of the quality indicators of the devices. An additional error was investigated depending on changes in operating conditions. The calculations of the relative error of the meter taking into account the limiting values of the additional errors indicated in the technical documentation, as well as calculations taking into account the coefficients of influence under operating conditions. Based on the obtained values of the influence coefficients, graphs were constructed on which the effect of temperature and pressure on the error was determined. The article provides tabular values of the influence coefficients for petroleum gas, a conclusion is drawn on the applicability of this method.Oil and gas industry have a great influence on development of national economy in our country. Oil and gas have a leading position in energy industry and they are more effective and energy-intense in comparison with other natural substances.

scholarly journals Development of a Chinese Chess Robotic System for the Elderly Using Convolutional Neural Networks

2020 ◽  
Vol 12 (10) ◽  
pp. 3980 ◽  
Author(s):  
Pei-Jarn Chen ◽  
Szu-Yueh Yang ◽  
Chung-Sheng Wang ◽  
Muslikhin Muslikhin ◽  
Ming-Shyan Wang
Keyword(s):  
Neural Networks ◽  
Elderly People ◽  
Convolutional Neural Networks ◽  
Great Influence ◽  
The Elderly ◽  
Robotic Arm ◽  
Life Long Learning ◽  
Dementia Patients ◽  
Reduce Risk ◽  
Aging Societies

According to the data from Alzheimer’s Disease International (ADI) in 2018, it is estimated that 10 million new dementia patients will be added worldwide, and the global dementia population is estimated to be 50 million. Due to a decline in the birth rate and the development and great progress of medical technology, the proportion of elderly people has risen annually in Taiwan. In fact, Taiwan has become one of the fastest-growing aged countries in the world. Consequently, problems related to aging societies will emerge. Dementia is one of most prevailing aging-related diseases, with a great influence on daily life and a great economic burden. Dementia is not a single disease, but a combination of symptoms. There is currently no medicine that can cure dementia. Finding preventive measures for dementia has become a public concern. Older people should actively increase brain-protective factors and reduce risk factors in their lives to reduce the risk of dementia and even prevent the occurrence of dementia. Studies have shown that engaging in mental or creative activities that stimulate brain function has a relative risk reduction of nearly 50%. Elderly people should develop the habit of life-long learning to strengthen effective neural bonds between brain cells and preserve brain cognitive functions. Playing chess is one of the suggested activities. This paper aimed to develop a Chinese robotic chess system for the elderly. It mainly uses a camera to capture the contour of the Chinese chessman, recognizes the character and location of the chessman, and then transmits this information to the robotic arm, which will grab and place the chessman in the appropriate position on the chessboard. The camera image is transmitted to MATLAB for image recognition. The character of the chessman is recognized by convolutional neural networks (CNNs). Forward and inverse kinematics are used to manipulate the robotic arm. Even if the chessmen are arbitrarily placed, the experiment showed that their coordinates can be found through the camera as long as they are located within the working scope of the camera and the robotic arm. For black chessmen, no matter how many degrees they are rotated, they can be recognized correctly, while the red ones can be recognized 100% of the time within 90° of rotation and 98.7% with more than a 90° rotation.

The Effect of Geometric Error on Machining Accuracy for Machining Center

2013 ◽  
Vol 690-693 ◽  
pp. 3244-3248
Author(s):  
Gui Qiang Liang ◽  
Ai Rong Zhang ◽  
Ting Ting Guo
Keyword(s):  
Great Influence ◽  
Geometric Error ◽  
Linear Displacement ◽  
Machining Accuracy ◽  
Geometric Errors ◽  
Lower Body ◽  
Body System ◽  
Research Results ◽  
Machining Center ◽  
Multi Body

In order to improve machining accuracy of machining center, the effect of geometric error on machining accuracy was researched by multi-body system theory. Taking a vertical machining center as example, topological structure of the machining center was described by lower body array. Geometric errors of the bodies in the multi-body system were expressed by homogeneous coordinate transformation. Error model for machining accuracy was deduced and geometric errors having great influence on the machining accuracy were identified. The research results show that, straightness errors and linear displacement errors in three directions have direct influence on machining accuracy, and the effect on machining accuracy caused by angle errors are related to the dimensions of the machining center and travel distance of the three axes. The research results provide guidance for analysis on sensitivity of geometric errors.

scholarly journals EXPERIMENT ON UAV PHOTOGRAMMETRY AND TERRESTRIAL LASER SCANNING FOR ICT-INTEGRATED CONSTRUCTION

2017 ◽  
Vol XLII-2/W6 ◽  
pp. 371-377 ◽  
Author(s):  
N. Takahashi ◽  
R. Wakutsu ◽  
T. Kato ◽  
T. Wakaizumi ◽  
T. Ooishi ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Measurement Accuracy ◽  
New Technologies ◽  
Laser Scanner ◽  
Great Influence ◽  
Image Resolution ◽  
Fiscal Year ◽  
Productivity Improvement ◽  
Accuracy Requirement ◽  
The Difference

In the 2016 fiscal year the Ministry of Land, Infrastructure, Transport and Tourism of Japan started a program integrating construction and ICT in earthwork and concrete placing. The new program named “i-Construction” focusing on productivity improvement adopts such new technologies as UAV photogrammetry and TLS. We report a field experiment to investigate whether the procedures of UAV photogrammetry and TLS following the standards for “i-Construction” are feasible or not. In the experiment we measured an embankment of about 80 metres by 160 metres immediately after earthwork was done on the embankment. We used two sets of UAV and camera in the experiment. One is a larger UAV enRoute Zion QC730 and its onboard camera Sony &amp;alpha;6000. The other is a smaller UAV DJI Phantom 4 and its dedicated onboard camera. Moreover, we used a terrestrial laser scanner FARO Focus3D X330 based on the phase shift principle. The experiment results indicate that the procedures of UAV photogrammetry using a QC730 with an &amp;alpha;6000 and TLS using a Focus3D X330 following the standards for “i-Construction” would be feasible. Furthermore, the experiment results show that UAV photogrammetry using a lower price UAV Phantom 4 was unable to satisfy the accuracy requirement for “i-Construction.” The cause of the low accuracy by Phantom 4 is under investigation. We also found that the difference of image resolution on the ground would not have a great influence on the measurement accuracy in UAV photogrammetry.

Design of CNC Grinding Machine Especially for C.V Joint Inner Race Spherical Raceway Processing

2010 ◽  
Vol 142 ◽  
pp. 55-58 ◽  
Author(s):  
Li Liu
Keyword(s):  
Simple Structure ◽  
Grinding Wheel ◽  
Work Piece ◽  
Machining Accuracy ◽  
High Productivity ◽  
Cnc Grinding ◽  
Main Components ◽  
Grinding Machine ◽  
Cnc Grinding Machine ◽  
Inner Race

This dissertation introduces the reform function of CNC grinding machine specially for automobile c.v joint inner race spherical processing. By analyzing the work piece machining accuracy requirements. In this paper, the overall reform program design and main components of structure were described. In addition, a simple structure, high productivity and high automatically CNC grinding wheel dressing spherical was precisely proposed.

Geometric Error Identification of a Three-Axis Machining Center

2013 ◽  
Vol 694-697 ◽  
pp. 1803-1807
Author(s):  
Gui Qiang Liang ◽  
Jun Xian Zhang ◽  
Fei Fei Zhao
Keyword(s):  
Working Conditions ◽  
Laser Interferometer ◽  
Great Influence ◽  
Geometric Error ◽  
Machining Accuracy ◽  
Geometric Errors ◽  
Positioning Errors ◽  
Machining Center ◽  
Influence Effect ◽  
Squareness Errors

Geometric errors of a machining center can cause great influence on machining accuracy, and these geometric errors should be identified and compensated in the actual working conditions. Taking a three-axis vertical machining center as example, 21 geometric errors of the machine tool were solved. By using the 12-line method based on a laser interferometer, identification principle of the positioning errors, straightness errors, pitch errors, yaw errors, roll errors and squareness errors are presented, and all of the 21 geometric errors of the machining center were identified. Geometric errors having great influence effect on machining accuracy can be identified. The research results provide guidance for analyze of geometric errors of machining center.

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