检索结果-内蒙古大学图书馆

Erratum to “Boiling heat transfer-based temperature rise characteristics of automotive permanent magnet synchronous motors at peak operating conditions”

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Journal of Mechanical Science and technology 2022年第8期36卷 4335-4335页

作者： Liange, He Hongling, Chen Wenjun, Shi Key Laboratory of Advanced Manufacture Technology for Automobile Parts Ministry of Education Chongqing University of Technology Chongqing China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China Chongqing Tsingshan Industrial Co. Ltd. Chongqing China

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Analysis of dynamic characteristics of five-axis CNC machine tool

Analysis of dynamic characteristics of five-axis CNC machine...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Wang, Sicheng Wang, Hongjun Han, Qiushi Gao, Yangjie Ge, Lun School of Mechanical and Electrical Engineering Beijing Information Science and Technology University Beijing China Key Lab of Modern Measurement and Control Technology Beijing Information Science and Technology University Beijing China Beijing Key Laboratory of Mechanical-Electronic System Measurement and Control Beijing Information Science and Technology University Beijing China

CNC machine tools play important role in industries. The dynamic characteristics of the machine tools are the main factor which affected the status of a machine tools. A three-dimensional model of a five-axis CNC machine tool was built by using PRO/E. First, the model was imported into ANSYS software in order to analyse the dynamic characteristics of the machine tool;the first six natural frequencies and vibration modes of the machine tool were obtained through modal analysis and harmonic response analysis. The accuracy of the finite element analysis model was verified through the experimental results. Finally, the optimisation suggestions of the machine tool structure were proposed. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Machine tools

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Study on uncertainty reasoning of running reliability testing face to CNC machine

Study on uncertainty reasoning of running reliability testin...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Wu, Guoxin Zuo, Yunbo Wang, Hongjun Xu, Xiaoli Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science &Technology University Beijing China School of Electromechanical Engineering Beijing Information Science &Technology University Beijing China

It is necessary to test the reliability of the operation of the machine itself for meeting the high-speed, ultra-precision, flexible, and other modern manufacturing and processing needs. In practical applications, the obtained reliability detection information presents a variety of uncertainties such as randomness, imprecision, incompleteness and so on, due to the complexity of the machining environment, the limitations of the sensor itself and the imperfections of the information acquisition technology. The uncertainty reasoning method is proposed to test reliability and accuracy precision. Based on the multi-sensor information characteristic, the rule of the credibility sets is established to achieve the operational reliability analysis. It can realise the uncertainty reasoning for the modal and reliability rules. Examples of analysis show that during the high-end CNC machine tools operational reliability analysis, it has a practical effect to study the uncertainty reasoning method of the modal and reliability propositional rule and the analysis basis can be provided for the precision degradation and fault diagnosis. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Reliability analysis

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Dynamic analysis on the whole body with sitting posture for impact loading

Dynamic analysis on the whole body with sitting posture for ...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Ma, Chao Yao, Jie Wang, Shaohong Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China School of Biological Science and Medical Engineering Beihang University Beijing China

Objected to influences of impact to the whole body with sitting posture, the inverse dynamical analysis is carried out. Firstly by using the high-speed video camera, the images of the marked points on the body and the impact platform are captured and then the marked points’ displacement can be obtained. Taking those displacements as input parameters, the inverse dynamical composition are continued with AnyBody Modeling System and responses are obtained and the impact transfer performance of the vertical direction in the human body with sitting posture and the muscle activities could be confirmed. From the sitting musculoskeletal model, it is concluded that acting forces of the joints and the mechanism performance of those parts of the body could be computed with different impact loadings, which would be conducive to understand the impact influence for the most parts of the body;especially for those parts that could be not tested. The study could be better for the reasonable countermeasures with certain postures for random impacting loadings. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Video cameras

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Machine tool chatter test and analysis

Machine tool chatter test and analysis

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Li, Linxi Zhong, Jianlin Wang, Hongjun Gao, Yangjie School of Mechanical and Electrical Engineering Beijing Information Science and Technology University Beijing100192 China Key Lab of Modern Measurement and Control Technology Beijing Information Science and Technology University Beijing100192 China Beijing Key Laboratory of Mechanical-Electronic System Measurement and Control Beijing Information Science and Technology University Beijing100192 China

Machine chatter phenomenon has a great influence on the stability during the machining process of the machine tool. It has a great limitation on the machining efficiency of the machine tool and the machining accuracy of the product. The flutter of a machining center will appear when a certain machining center reaching a particular speed. The chatter will occur at a specific frequency. With the increase in the depth of cutting and the spindle speed, the value of chatter frequency will have complex changes;through the vibration test, it was confirmed that the two chatter frequencies are the natural frequencies of the product system and the spindle system, respectively. Improve the optimisation parameters and propose ways to suppress chatter. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Machining centers

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Precision testing method of five-axis NC machine tool based on ‘S’ specimen cutting

Precision testing method of five-axis NC machine tool based ...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Xu, Mengying Wang, Hongjun School of Mechanical and Electrical Engineering Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Beijing Information Science and Technology University Beijing100192 China

‘S’ specimen through its unique profile features makes it possible to fully mobilise the five-axis linkage function in the five-axis finishing stage. The continuous rotation direction of the rotating axis not only reflects the static error of the machine tool but also the servo system follow error, tool positioning error, profile error etc. The authors studied its influence on the accuracy of each axis of five-axis CNC machine tool by analysing the geometrical characteristics of a S specimen and using UG's CAM environment to process ‘S’ specimen. Finally, the corresponding program forming system for S specimen machining experiments is designed by LabVIEW, and the authors used macro instruction to do NC program trigger system to collect vibration signals segmentally, so that the processing and acquisition system can be synchronised. This provides a more complete basis for the test piece cutting method to evaluate performance of machine tools. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Machine tools

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Research on gear crack diagnosis of the planet gear transmission

Research on gear crack diagnosis of the planet gear transmis...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Ma, Chao Liu, Lingtao Wang, Shaohong Peng, Yumin Key laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China Mechanical Electrical Engineering School Beijing Information Science and Technology University Beijing China

Objected to the planetary gear transmission, research on the fault diagnosis of gear cracks is mainly carried out with method of EEMD decomposition and Envelope demodulation. During the process, EEMD decomposition is used to the experiment data and continuously parameters of the root mean square (RMS) value, peak-to-peak (PtP) value, kurtosis (Kr), and other parameters of the IMF components are computed. According those parameters, the signal is reconstructed and after band-pass filtering the Hilbert transform and the envelope demodulation are carried out. The results showed that the power spectrum information obtained by using the EEMD decomposition and Hilbert transform could effectively response fault characteristics of the gear crack in the planetary transmission. The research is beneficial to the gear meshing fault diagnosis of the planetary transmission quickly and accurately and has a positive engineering value. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Demodulation

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Research on reliability comprehensive evaluation method of five-axis CNC machine tools based on AHP and extension theory

Research on reliability comprehensive evaluation method of f...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Wang, Pengjia Wang, Hongjun Chen, Xiumei School of Mechanical and Electrical Engineering Beijing Information Science and Technology University Beijing China Key Laboratory of Modern Measurement and Control Technology of Ministry of Education Beijing Information Science and Technology University Beijing China

Currently, some five-axis CNC machine tools have almost achieved the same advanced level of the western countries in terms of functionality and performance. However, the reliability of system is much lower than similar foreign products. The reliability has become one of bottlenecks to restrict the development of domestic CNC machine tools. At present, domestic reliability research of CNC machine tools developed rapidly, but the evaluation research is limited to a single indicator, lacking overall evaluation about it. To fully evaluate the reliability of five-axis CNC machine tools, the matter-element model of reliability evaluation is established with the application of matter-element in extension theory, and the reliability evaluation indices system is established comprehensively. The correlation functions are introduced to calculate the correlation degree, and the weights of each evaluation indices are determined by using AHP. The actual example and result on two types of domestic CNC machine tools show that the proposed method is effective, reasonable, and accurate in the process of reliability evaluation. The proposed methodology provides a detailed instruction for comprehensive reliability evaluation of CNC machine tools. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Hierarchical systems

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Vision-based and real-time calibration of industrial robot by using deep learning and dimension-reduced models

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Precision Engineering 2025年

作者： Zhouxiang Jiang Ruoheng Ding Yuxuan Liu Zhongjie Long Bao Song College of Mechanical and Electrical Engineering Beijing Information Science & Technology University 12 Xiaoying East Road Qinghe Haidian District Beijing 100192 China Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science & Technology University 12 Xiaoying East Road Qinghe Haidian District Beijing 100192 China National NC System Engineering Research Center Huazhong University of Science & Technology 1037 Luoyu Road Wuhan 430074 China

A real-time calibration method for six-DoF industrial robot is presented. It aims to address the issue that calibration always suspends the work of robot and is quite costly due to repeated utilization of expensive measurement instrument. For this, a pose measurement strategy with cost-effective cameras is proposed where the work trajectory of robot is considered as a strict constraint on configurations to meet the requirement of real time. However, such efficiency improvement is accompanied by the accuracy decrease because the camera brings large measurement error and the trajectory constraint results in the reduced parameter identifiability. Firstly, to pull up the camera performance to the same level of precise instrument like the laser tracker, a set of neural networks are designed to map the inaccurately measured poses by camera to the accurate poses of concerned joints. Secondly, a dimension-reducing method is proposed to truncate the constrained kinematic-error model into two, which commonly achieve high parameter identifiability. Simulation shows that the prediction accuracy of joint pose with the well-trained networks is much higher than the measurement accuracy of laser tracker. Besides, the calibration accuracy with the dimension-reduced models is validated to be higher than that with the single high-dimension model of typical calibration. Finally, a generation strategy of training data with deeper regularity is proposed to meet the accuracy requirement in real scene, and the comparative results in the experiment validate a good potential of the real-time calibration method in manufacturing that requires high accuracy of robot and no suspension of work.

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An adaptive magnetization structure and method for low field NMR two-phase flow measurement

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Journal of Physics: Conference Series 2021年第1期1894卷

作者： LI Li-pin Han Rui-qiang Huang Yan-qun Chen Huan Shanxi Key Laboratory of Measurement and Control Technology for Oiland Gas Wells Xi'an Shiyou University Xi'an China Xi'an Modern Control Technology Research Institute Xi'an China

In low field NMR multiphase flow measurement, the magnetization time and magnetization length are affected by the two-phase flow velocity and water fraction, so it is difficult to realize the complete magnetization of multiphase flow with fixed length magnet. In this paper, an adaptive magnetization structure for two-phase flow is proposed. The pre-magnetization model of the adaptive structure is established based on the magnetization theory of nuclear magnetic resonance. And parameters of the adaptive magnetization structure are determined by analyzing the influence of two-phase flow parameters such as velocity and water fraction on magnetic susceptibility. Finally, the simulation analysis shows that the adaptive magnetization structure can achieve complete magnetization effect for two-phase flow in the range of water fraction 0-36% and flow rate 0-4.66m/s, which provides the necessary conditions for the accurate measurement of NMR two-phase flow and provides a new idea for the design of NMR two-phase flow measurement sensor.

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