Dissertations / Theses on the topic 'Rotation accuracy'
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Docampo-Sanchez, Julia. "Smoothness-increasing accuracy-conserving (SIAC) line filtering : effective rotation for multidimensional fields." Thesis, University of East Anglia, 2016. https://ueaeprints.uea.ac.uk/63740/.
Full textHudson, Derek Lavell. "Improving Accuracy in Microwave Radiometry via Probability and Inverse Problem Theory." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3244.pdf.
Full textDogantimur, Erkan, and Daniel Johnsson. "Analysis of Accuracy for Engine and Gearbox Sensors." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388346.
Full textMach, Taylor Joseph. "Accurate Prediction of Chiroptical Properties." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64301.
Full textPh. D.
Shenoy, Rajiv. "Overset adaptive strategies for complex rotating systems." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51796.
Full textBezuidenhout, Carel Willem. "The accuracy of clinical examination of rotational and sagittal laxity of the knee." Master's thesis, University of Cape Town, 2020. http://hdl.handle.net/11427/32462.
Full textMarek, Tomáš. "Predikování vybraných vlastností rotačních kinematických dvojic obráběcích strojů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-408064.
Full textЧирков, Д. А., and D. A. Chirkov. "Автоматизация контроля и сортировки бомбинированных подшипниковых роликов по биению сферического торца : магистерская диссертация." Master's thesis, б. и, 2019. http://hdl.handle.net/10995/74340.
Full textThe aim of the work is to develop, study the accuracy and design of a measuring station for monitoring the runout of a spherical roller end of a radial two-row spherical rolling bearing based on an existing machine (A-2292-M) to control the granularity of barrel rollers. In the course of the work, a metrological scheme was proposed, which was necessary to control the spherical end of the roller, its accuracy was investigated, and the design of the measuring station was developed. The implementation of the measuring system in the design of the automatic machine for control of granularity with two options for sources of rotation of the roller in the measurement process is shown. The calculation of economic efficiency from improving the quality of rollers and increasing the period between repairs is carried out. The basis of the measuring node is the use of an inductive (auto-oscillating) sensor and an intermediary element in conjunction with the metrological scheme presented in the work.
Дзюра, Володимир Олексійович. "Наукові основи забезпечення параметрів якості робочих поверхонь тіл обертання технологічними методами." Diss., Тернопільський національний технічний університет імені Івана Пулюя, 2021. https://ena.lpnu.ua/handle/ntb/56686.
Full textGoubeaux, Craig A. "The Accuracy of Measuring Lumbar Vertebral Displacements Using a Dynamic MRI Sequence." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1480436812645944.
Full textKhalil, Hossain. "Highly accurate studies of the rovibronic states of small size radicals." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1028/document.
Full textHighly correlated ab initio methodologies were used to investigate the rovibronic structure and the spectroscopy of 2 to 4 atoms radicals. For the CaO, OH, CaH, CaO+ and CaO− molecules, our computed spectroscopic constants are in good agreement with the experimental ones. The study of these diatomic fragments is essential to investigate the calcium monohydroxide isomers (CaOH-HCaO). The most complex system among these diatomic radicals is the calcium monoxide radical CaO due to high density low lying electronic states. The rovibrational energies of these states have been calculated, based on the potential energies obtained at high level of accuracy, taking into account the angular momentum and spin orbit couplings and found to be in a very good agreement with the experimental results. The complexity in studying such a system is again present in the ketenyl radical HCCO with highly coupled ground and first excited states. The Renner-Teller effect of HCCO is studied using a variational approach including all degrees of freedom. Valence coordinates have been used to fit both potential energy surfaces varying the six degrees of freedom. The low-lying rovibronic levels have been determined for different values of the total angular momentum
Ramadan, Lucas Busnardo. "Validade e confiabilidade da ressonância magnética para o diagnóstico da rotura do tendão do subescapular." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/5/5140/tde-07112018-113001/.
Full textINTRODUCTION: The accuracy of magnetic resonance imaging (MRI) for the detection of subscapularis tear presents wide variation in the literature. There are few prospective studies and great methodological variation. It is believed that these tears are more difficult to diagnose than the posterosuperiores rotator cuff injuries. The subscapularis tendon has importance in the biomechanics in the shoulder and its rupture leads to functional impairment. A diagnostic tool of good accuracy is fundamental in clinical practice, influencing prognosis and surgical planning. The aim of this study was to evaluate the validity of preoperative MRI in the identification of the subscapularis tears, comparing the imaging findings with the intraoperative data of arthroscopic surgery. As a secondary objective, we evaluated the reliability of the method through interobserver and intraobserver agreement. METHODS: We performed a diagnostic accuracy study comparing MRI findings (index test) with those of arthroscopy (reference test), in a prospective cohort. We included patients submitted to arthroscopy for the treatment of rotator cuff tears that had undergone high magnetic field MRI without using contrast. Cases of previous surgical manipulation in the shoulder, exams with moving artifacts, indication for open surgery and interval between MRI and surgical procedure of more than one year were excluded. The images were evaluated by a shoulder surgeon and two musculoskeletal radiologists, independently and blinded to the results of arthroscopy, being reassessed after 3 months by the surgeon. We calculated the validity (sensitivity, specificity, positive predictive value, negative predictive value and accuracy) and reliability (inter- and intraobserver agreement) of MR in detecting subscapularis tears. RESULTS: We evaluated 200 shoulders. The incidence of subscapularis tears was 69.5% (41.5% partial and 28.0% transfixing). The shoulder surgeon showed sensitivity from 51.1 to 59.0% and specificity from 91.7% to 94.4%. The radiologists, 83.5 to 87.1% of sensitivity and 41 to 45.9% of specificity. Accuracy ranged from 60.5 to 73.0%. The mean values of sensitivity, specificity and accuracy were 70.2%, 61.9% and 67.6%, respectively. Interobserver agreement was moderate for the detection of subscapular tears (kappa coefficient 0.463, 95% CI 0.383-0.534, p < 0.001), as well as intraobserver agreement (kappa coefficient 0.546, 95% CI 0.430-0.662, p < 0.001). Patients with subscapular rupture had a higher incidence of biceps rupture and instability, greater fat subscapular degeneration, and higher mean age. The other variables did not present statistically significant differences. CONCLUSION: MRI of high magnetic field without contrast showed mean values of sensitivity, specificity and accuracy of 70.2%, 61.9% and 67.6%, respectively. Sensitivity was higher in radiologists while specificity in the shoulder surgeon. Interobserver and intraobserver agreement was moderate
Green, Brian Richard. "Time-averaged and time-accurate aerodynamics for the recessed tip cavity of a rotating high-pressure turbine blade and the stationary outer shroud." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406807021.
Full textGreen, Brian Richard. "Time-Averaged and Time-Accurate Aerodynamic Effects of Rotor Purge Flow for a Modern, Rotating, High-Pressure Turbine Stage and Low-Pressure Turbine Vane." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1322535026.
Full textVikas, Sharma. "Development of Space-Time Finite Element Method for Seismic Analysis of Hydraulic Structures." Kyoto University, 2018. http://hdl.handle.net/2433/235094.
Full text0048
新制・課程博士
博士(農学)
甲第21374号
農博第2298号
新制||農||1066(附属図書館)
学位論文||H30||N5147(農学部図書室)
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 村上 章, 教授 藤原 正幸, 教授 渦岡 良介
学位規則第4条第1項該当
Vestin, Albin, and Gustav Strandberg. "Evaluation of Target Tracking Using Multiple Sensors and Non-Causal Algorithms." Thesis, Linköpings universitet, Reglerteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-160020.
Full textSilva, Inês Mendes de Sousa Baptista da. "The impact of questions rotation in response accuracy." Master's thesis, 2012. http://hdl.handle.net/10362/8404.
Full textIn market research, with regard to measuring customer satisfaction, it is necessary to translate clearly and concisely the respondent's perception in which concerns the different questions under consideration. Therefore, problems relating to the questions presented in questionnaires are quite frequent, both regarding to the characteristics of the question itself, like the type of scale to be used or the number of scale items, and the position of the question in the questionnaire like sequence of the questions or grouping questions. The main goal of studying the items rotation in the questionnaire is to understand behaviors that can reduce the response accuracy. In this study, it was used the effect of rotating questions in a questionnaire with view to conclude how this can or cannot influence the answers of the respondents. To perform this analysis it was used the survey “ECSI-Index National Customer Satisfaction” (area of telecommunications), which was divided into two blocks to check for differences in responses depending on the question’s rotation in the questionnaire. We conclude that there are no significant differences between the responses given in both circumstances: with item rotation and without rotation.
Huang, Shou-Zheng, and 黃守正. "Study on Rotation Axial Positioning Accuracy of Five - axis Machine by Taguchi Method." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/z9sgxt.
Full text國立勤益科技大學
機械工程系
105
The main purpose of this paper is to explore the axial positioning accuracy of the five-axis tooling machine. Firstly, the effects of different tool length, tool diameter, C-axis center distance and Kinematic correction distance on the accuracy of rotation axial positioning accuracy are discussed. Under different cutting conditions, the difference in the junction of the finished product is compared, and it is expected that there will be further understanding of the rotational axial positioning accuracy, and then the experiment is planned by the Taguchi method to obtain the optimization of the rotational axial positioning accuracy Processing conditions, the signal by noise analysis data, and by statistical analysis of variance to understand the contribution of each factor. Rotation axial positioning accuracy The experimental results show that the longer the tool, the greater the diameter of the tool or the distance from the mechanical origin of the greater the error will be greater, the processing of the broken will be more obvious, the rotation of the axial positioning accuracy in the shorter the length of the tool , The smaller the diameter of the knife, from the mechanical origin of the way under the experiment, the smaller the finished product defect, that knife length is short, knife radius is small, from the mechanical origin of the best cutting mode. The results of Taguchi show that the distance between A-axis rotation angle and distance from C-axis center is the main factor affecting machining failure. In experiment 2, the A-axis rotation angle and Kinematic correction distance are the main factors influencing machining failure. The results of the previous two groups show that the distance between the center of the C axis, Kinematic correction distance and A axis rotation angle are the most significant influencing factors, and the tool length and tool diameter have little effect. The experimental results show that the average error is 0.05mm, which is in accordance with the requirement of the axial positioning accuracy of the five-axis machine.
Wu, San-Ching, and 吳三鏡. "The Analysis and Measurement Principle of Geometry Accuracy for Spindle Rotation of Machine Tool." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/5mumeh.
Full text國立成功大學
機械工程學系
87
This paper elaborates the deviation of rotation based on dynamic mechanics, establishes the mathematical model of rotation through the concept of geometric accuracy, and constructs the measurement principle of spindle rotation for machine tools. For instance, the radial, axial and tilt errors are used to evaluate the accuracy of spindle rotation of single-point cutting machine tools; the concept of cylindrical error is used to evaluate the accuracy of spindle rotation of multi-point cutting machine tools. To separate motion errors of machine tool parts, the three-point measuring method is used. This method can separate the errors of the straight-line motion of the slide track from those of the motional parts of the machine tools. The method is modified to separate the roundness errors of the rotational parts of spindle by changing its initial measuring point. The cylindrical error of the rotational spindle is the extension of roundness error. It can be obtained by evaluating the roundness error of each cross section projected onto the perpendicular basal plane according to the measurement of straight-line error. The mathematical model of the cone and the sphere can be constructed by using the concept of the minimum circumscribed cone, the least-square method, and residual-error principle. This measurement principle has proved effective through the use of standard bar, sensor, transducer, amplify, control interface and computer to measure the radial, axial and tilt errors of spindle rotation of single-point cutting machine tools.
Yang, Pei-Feng, and 楊沛峰. "The Analysis of the Position of the Rotation Center during Golf Swing and Its Hitting Accuracy." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/wpd897.
Full text國立體育學院
教練研究所
90
The purpose of this study was to first verify the position of the rotation center during golf swing to be the central area of cervical curvature C-7 and then examine the correlation between the rotation center and the accuracy of hitting the golf ball. In this study, the position of the rotation center was defined as the “top spot” because it happens to be the apex of the rotation axis, and it was assumed to be the steady point during golf swing. Under this assumption, there are two main factors that control the accuracy of hitting the ball right on the sweet spot of the club face. One is the stability of shoulder and trunk rotation indicated by the displacement of the top spot, and the other is the correct height of the top spot when the club hits the ball. Four golf athletes and four beginners participated in the study and each of them performed forty golf swings. All the swings were recorded by digital cameras(1/120 sec) to catch the image of each golfer’s body movements from views above the golfer’s head as well as behind the back. Then the computer software Ariel Dynamics system was used to digitize the images in order to observe the stability of the rotation center, i.e., the least displacement of the top spot in the horizontal direction, and the height difference of the top spot, i.e., the least displacement in the vertical direction. In addition, three coordinates, with horizontal axes X1, X2, X3, and vertical axes Y1, Y2, and Y3, were established to mark the sweet spot and to locate each ball’s exact impact position on the club face. The statistical software SPSS for Windows was used to calculate and compare the rotation stability and height difference of the top spot between hits inside and outside the sweet spot. Results of the Pearson’s correlation analysis showed a statistically significant (p<.05) relationship between the stability of the rotation center and hitting accuracy as well as between the height difference of the top spot and hitting accuracy.
Hsieh, Hsiang-Wei, and 謝祥威. "Development of the fast on-machine assembly-accuracy measurement method and system for the 2-DOF Rotation of a TTTRR 5-axis machine tool." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/3x975z.
Full text中原大學
機械工程研究所
103
CNC 5-axis machine tools play a very important role in high-precision machining applications. Because assembly accuracy influences the final accuracy of a a-axis machine tool, calibration technology for assembly accuracy between the 2-DOF rotation axes and 3-DOF translation axes is very necessary for manufacturing a 5-axis machine tool, which is also the first threshold to maintain the accuracy of the machine. Per the request of the industry, this study will integrate error analysis, DH-rule, error model development, coordinates homogeneous transformation, measurement trajectory design, on-machine separation measurement, bilateral-communication with CNC controller, ICT, and NC program/human-machine interface development to develop a low-cost and high-efficiency assembly accuracy measurement/calibration method and system for a TTTRR 5-axis machine tool. With use of a low-cost measurement device, the method can measure the geometry errors between the 2-DOF rotation axes and the 3-DOF translation axes, and the location errors of the centers of the 2-DOF rotation axes. Considering measurement efficiency and convenience, a calibration measurement system with function of graphic display for error analysis and a convenient human-machine interface will be built in Visual C# language. The system can also automatically generate a measurement report to hele the user to quickly understand the calibration results and the characteristics of the measured errors. Practical data collection for measurement method development and verification experiments will be conducted on a TTTRR 5-axis machine tool provided by Da-Lih machinery Co.
Федориненко, Дмитро Юрійович. "Наукові основи проектування прецизійних регульованих гідростатичних опор шпиндельних вузлів." Doctoral thesis, 2012. https://ela.kpi.ua/handle/123456789/2330.
Full textLai, Siang-Min, and 賴祥民. "Development of an Electro-Optical Measurement System for Rotational Accuracy of Five-axis Machine Tools." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/mfg6am.
Full text國立虎尾科技大學
光電與材料科技研究所
100
A procedure is an electro optical measurement rotary accuracy and position accuracy of five-axis machine tools, it is designed to replace the contact type system and light interference measurement system, this system is divided into two parts, first part is rotary axis accuracy measurement system which uses laser diode as system light source and quadrant photo diode to receive light single that can detect the three-dimensional position of cat''s eye reflector . The Second part is cat''s eye reflector which uses ball lens of n=2 with coating aluminum to hemispherical that is used to convey message of the table position on the machine tool. This measurement system will be detected the rotary accuracy and position accuracy of the five-axis machine tools, and use tip tracking for machine tools. The advantage of this system is low price without expensive optical components, the installation process of it is convenient and quickly, erection of it is sample and reduces the measurement time significantly. This system has low-cost and the components are very small, high measurement accuracy, and position error of system about +/-1μm, system resolution can be measured to 50nm.
Chiu, Te-Ping, and 邱德評. "Development of an Electro-Optical Measurement System for Rotational Accuracy of a Direct Drive Motor." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/7ayd6t.
Full text國立虎尾科技大學
光電與材料科技研究所
98
A new system of optical measurement of rotary rotational error is developed in this research. Displacement error of radial and axial rotation and tilt error of axial angular are two parts in this system. First part is the measurement system, by using a ball lens and two laser diodes that are perpendicular to each other, it determine displacement error of radial rotation. This study is applied in measurement of rotary rotational error of Direct Drive Motor, the rotary rotational error is 12μm and standard deviation is 0.8μm. Second part is angular measurement system, by DVD pickup, it is evaluated rotation of tilt error of axial angular, and then the real error values for rotational tilt error of radial and axial is determined by mathematical model. The rotary tilt error of axial angular of Direct Drive Motor is 40 arc-sec and standard deviation is 0.3 arc-sec. The advantages of this measurement system are that it doesn''t need expensive standard sample, the setting and operating is easier, the overall set up stuff is cheaper, elements size is small, and measuring accuracy is higher. The analyzable is 15nm in this measurement system.
林宸緯. "Study on the accuracy measurement and compensation on gear type of manual 90 degree rotating axis." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/01781511345535375180.
Full text國立彰化師範大學
機電工程學系
102
The purpose of this article is aim to discuss about the geometric accuracy and errors analysis/difference before making compensation on a bridge type milling machine installed with a 90 degree rotating axis and after making compensation. It’s tested by making a ISO 10791-7 test piece cutting to make comparison in between. The test piece has a hole with diameter of 125mm on the right and left sides. We made a boring on both sides without compensation and made concentricity measurement by CMM instrument. Then make an analysis through the CMM measured data and the accuracy/tolerance difference of the workpiece before compensation. The accuracy/tolerance of the wokpiece might be changed after installing the gear type of manual 90 degree head, and affect/ change the tool center point. Therefore, we made the tool center point compensation while converting vertical machining to horizontal machining. The research result appeared that the CMM measured concentricity before compensation is about 0.03~0.05mm. However, the concentricity was improved to 0.02mm after compensation.