Investigations of Dynamic Goniometers with Optical Angle-Data Transmitter

Ivashchenko, E. M.; Pavlov, P. A.

doi:10.1007/s11018-014-0403-6

Cited by 5 publications

(6 citation statements)

References 2 publications

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“…The dynamic goniometer (DG), which implements angular measurements with joint continuous rotation of the calibrated and high-precision encoders, is a new class of goniometers that allows calibrating encoders of various types in dynamic mode with high accuracy and minimal time. 4 DG consists of ring laser 5 or optical angle encoder, installed on DG's spindle. The motor with the drive system rotates the DG spindle.…”

Section: Introductionmentioning

confidence: 99%

“…Due attention has not been paid to the study of this dynamic error. 4 The purpose of the work is to analyze the effect of the rotation speed on the measurement error of a DG with a reference encoder and a ball bearing. In some cases, the random error limits the potential accuracy of measurements.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…DG errors are characterized by static errors, such as the error of the angular scale, and dynamic errors, which are determined by the nature of the rotation of the DG spindle fixed in bearings. Due attention has not been paid to the study of this dynamic error 4 . The purpose of the work is to analyze the effect of the rotation speed on the measurement error of a DG with a reference encoder and a ball bearing.…”

Section: Introductionmentioning

confidence: 99%

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Metrological aspect of the dynamic goniometer for optical angle encoder’s calibration

Pavlov,

Ivashchenko

2024

Opt. Eng.

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Dynamic goniometers (DGs) are used to calibrate optical angle encoders with high accuracy over a wide range of rotation speeds. The dynamic mode of operation of the goniometer causes an additional error. A current task is to research this dynamic error. The systematic component of the DG's error can be eliminated by introducing corrections to the measurement result. Thus the main factor limiting the accuracy is a random error, including non-stationary components. For its analysis, the Allan variation method, Fourier, and wavelet analysis were used. Experimental studies of the DG with ball bearing and reference optical angle encoder at various rotation speeds have been carried out. Arrays of random variables characterizing the DG's random error were studied; they are non-stationary in terms of the average value. Using the Allan variation, the sinusoidal and white noise were determined. Fourier analysis revealed the presence of frequency errors in the random error, which are caused by the processes of movement of the bearing components, as well as a defect in the separator. Wavelet analysis made it possible to clarify the nature of the processes, to trace the change in the frequency composition over time. When constructing a DG for calibrating encoders, special attention should be paid to the quality of ball bearings. It has been determined that dynamic errors make a significant impact on the measurement error. The ball bearing, namely the defect of the bearing cage, is the major reason that causes non-stationary effects at low frequencies. As studies have shown, ball bearings increase the random error of the DG by an order of magnitude or more compared to its potential accuracy, which is significantly < 10 −2 00 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metrological aspect of the dynamic goniometer for optical angle encoder’s calibration

Pavlov,

Ivashchenko

2024

Opt. Eng.

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“…For this reason, the accuracy of certain transducers and angular encoders is checked using a reference polygonal prism (mirrored polygon) and automated autocollimator mounted on the shaft (table, spindle) [8]. In such a checking method, shaft rotation angles specifi ed by the prism are compared to the angles determined by the encoder (device).…”

mentioning

confidence: 99%

Test Stand for Checking Rotary Converter Accuracy

Smirnov¹,

Latyev²,

Mitrofanov³

et al. 2016

Meas Tech

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S. M. Latyev, UDC 681.7 S. S. Mitrofanov, and G. V. EgorovMethods and equipment are considered for automated checking of rotary encoder accuracy using highprecision transducers and accurate devices for their integration, as well as a method of compensating for certain checking errors. An improved test stand is presented that provides improved rotary encoder calibration accuracy.Analog and digital rotary encoders manufactured by a number of companies in the form of standardized (modular) devices are widely used in machine and instrument engineering [1-3]. Such transducers have different principles of operation. Each transducer must undergo periodic checks and calibration tests during their manufacture and operation. Many methods and devices are known for checking transducer accuracy [4][5][6]. High-precision transducers exhibit high accuracy and resolution, which requires the use of measurement devices with even stricter accuracy characteristics, as well as the performance of checks in a greater number of positions, approaching the number of pulse-generating elements (lines) on the encoder's reference scale. For example, off-the-shelf high-precision photoelectric transducers of accumulating and absolute type that use circular rasters and code scales (18-24 bits) have an error of 1-5ʺ and 18000-36000 lines on the controlled path.The error of checked transducers is normally evaluated by comparing them against linked reference rotary encoders. In most cases, the shafts of the encoder being checked and the reference encoder are connected by an accurate compensation coupling that brings them into synchronous rotation and compares conversion codes from shaft rotary motion. Here, the reference encoder must exhibit a three-fold (or higher) accuracy margin as compared to the encoder being tested.A shortcoming of such a checking method is that the compensation couplings transmit movement from one shaft to the other with errors, which depend on the accuracy of the mutual position of the connected shafts, determined by axial misalignment, skew, as well as axial and radial rotational errors [7]. Before the check is performed, the shafts must be closely aligned with each other. The best domestically produced high-precision couplings (LIR-805 and LIR-807 [1]) exhibit an error of ±(0.5-1)ʺ provided the connected shafts exhibit no greater than 0.05 mm axial misalignment and 0.09° skew.Quite often, errors associated with compensating coupling rotary transmission are greater than those exhibited by the encoders being checked, and it does not appear feasible to consider their impact on accuracy checking. For this reason, the accuracy of certain transducers and angular encoders is checked using a reference polygonal prism (mirrored polygon) and automated autocollimator mounted on the shaft (table, spindle) [8]. In such a checking method, shaft rotation angles specifi ed by the prism are compared to the angles determined by the encoder (device). However, in doing so, checking may be accomplished at a number of points that is limited by...

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Dynamic research of multi-body mechanical systems of angle measurement

Kilikevičius

Kasparaitis

2017

Int. J. Precis. Eng. Manuf.

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Investigations of Dynamic Goniometers with Optical Angle-Data Transmitter

Cited by 5 publications

References 2 publications

Metrological aspect of the dynamic goniometer for optical angle encoder’s calibration

Metrological aspect of the dynamic goniometer for optical angle encoder’s calibration

Test Stand for Checking Rotary Converter Accuracy

Dynamic research of multi-body mechanical systems of angle measurement

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