Method 106
Angular position positioning test
1. Test Objective
The repeatability and positioning accuracy of the test turntable at any controlled angular position within a 360° range under angular position control state.
2. Test Instruments
Small angle measuring instrument;
The photoelectric autocollimator (hereinafter referred to as the optical tube) with resolution not less than 0.1";
A 360-tooth multi-tooth indexing table (hereinafter referred to as the 360-tooth disk) and a plane mirror;
A 391-tooth multi-tooth indexing table (hereinafter referred to as the 391-tooth disk) and a plane mirror;
23-faceted prism, Level 1;
24-faceted prism, level 1.
3. Test Environment Conditions
Ambient temperature: 20±2℃;
Relative humidity: <70%.
Vibration isolation requirements: The turntable under test shall be placed on a vibration isolation foundation, with no severe vibrations or impacts around it;
Electromagnetic field requirements: There should be no strong electromagnetic interference in the vicinity of the test site.
4. Test Methods
Before the test, install the multi-tooth disk and plane mirror or multi-faceted prism at the center of rotation of the shaft being measured on the turntable. Install the optical tube on the stationary part of the shaft being measured or on a well-isolated foundation, ensuring that the optical axis of the optical tube is perpendicular to the plane mirror or prism face. Start the turntable and ensure that it operates normally and stably under angular position control state.
4.1 Direct Test Method
4.1.1 Angular Positioning Repeatability
The experiment uses a 23-faceted prism or a 391-tooth disk and a plane mirror. Starting from an arbitrary angle position θ₁ of the axis under test, align face I of the prism or the plane mirror with the light tube and record the light tube reading a1i . Then , sequentially give position commands Ai ( i=1,…,23) to rotate the axis under test through the specified angle value of the prism, and record the corresponding light tube reading a1i . Then, starting from θ₁, rotate the axis under test in the opposite direction and repeat the above experiment, recording the corresponding light tube reading a2i . When using a multi-tooth disk, the disk should be rotated in the opposite direction through the angle rotated by the axis of rotation to align the plane mirror with the light tube.
4.1.2 Angular Position Positioning Accuracy
4.1.2.1 Component Test Method
4.1.2.1.1 Indexing accuracy
The experiment uses a 24-faceted prism or a 360-tooth disk and a plane mirror. Starting from position 0 on the digital display of the angular position measurement system of the measured axis, align face I of the prism or position 0 of the multi-tooth disk with the light tube and record the light tube reading a1. Then, sequentially give position commands Ai ( i=1,…,24) to rotate the measured axis through the specified angular position of the prism and record the light tube reading a1i . When using a multi-tooth disk, the disk should be rotated in the opposite direction by the angle rotated by the measured axis until the plane mirror is aligned with the light tube.
4.1.2.1.2 Subdivision Accuracy
Using a small angle measuring instrument, depending on the specific requirements of the selected small angle measuring instrument, its rotating part is mounted on the shaft being measured, and its stationary part is mounted on the stationary part of the shaft being measured or on a good vibration-isolated foundation.
Three angular positions within the 360° range of the measured axis were selected for subdivision testing. The angular position measurement system was used at the 0° position, and the angular positions θm and θn with the maximum positive and negative errors obtained from the indexing accuracy test . The selection of the subdivision angle interval was as follows: when using a 720-pole inductive synchro as the angle measuring element, the subdivision angle interval was 1°, and the number of subdivision points was 17; when using other angle measuring elements, the angle interval was selected as one cycle of subdivision, and the number of subdivision points was not less than 9.
The 0° position subdivision accuracy test starts from the 0° position of the measured axis angular position measurement system. Record the reading b01 of the small angle measuring instrument , and sequentially give position commands Bi ( i=1,…17) to make the measured axis rotate 1°/17 each time, and record the reading b0i of the small angle measuring instrument .
The test method for the position subdivision accuracy of θm and θn is the same as above, and the readings of the small angle measuring instrument are recorded as b1i and b2i respectively .
4.1.2.2 Comprehensive Test Method
The experiment uses a 23-faceted prism or a 391-tooth disc and a plane mirror. Starting from position 0 on the digital display of the angular position measurement system for the measured axis, align face 1 of the prism or position 0 of the disc with the light tube and record the light tube reading C₁. Then, sequentially give position commands Ci ( i=1, …,23) to rotate the measured axis through the angular position specified by the prism, and record the light tube reading Ci . When using a multi-toothed disc, rotate the disc in the opposite direction through the angle rotated by the measured axis to align the plane mirror with the light tube.
4.2 Indirect Experimental Method
4.2.1 Angular Position Positioning Repeatability
4.2.1.1 Angular Position Measurement Repeatability
The angular position measurement repeatability Eα is obtained according to items 4.1 and 5.1 in Method 104.
4.2.1.2 Angular position control repeatability
The angular position control repeatability Eαc is obtained according to items 4.1 and 5.1 in Method 105.
4.2.2 Angular Position Positioning Accuracy
4.2.2.1 Angular position measurement accuracy
The angular position measurement accuracy +Uα and -Uα are obtained according to items 4.2 and 5.2 in Method 104 .
4.2.2.2 Angular position control accuracy
The angular position control accuracy Uαc is obtained according to items 4.2 and 5.2 in Method 105 .
5. Data Processing and Result Evaluation
5.1 Direct Experiment Method
5.1.1 Angular Position Positioning Repeatability
Proceed according to section 5.1 of method 104.
5.1.2 Angular Position Positioning Accuracy
5.1.2.1 Component Test Method
Proceed according to section 5.2.1 of method 104.
5.1.2.2 Comprehensive Test Method
Proceed according to section 5.2.2 of method 104.
5.2 Indirect Experimental Method
5.2.1 Angular Position Positioning Repeatability
5.2.2 Angular Position Positioning Accuracy
The angular position positioning accuracy is +Uαp and -Uαp.
Method 106
Angular position positioning test
1. Test Objective
The repeatability and positioning accuracy of the test turntable at any controlled angular position within a 360° range under angular position control state.
2. Test Instruments
Small angle measuring instrument;
The photoelectric autocollimator (hereinafter referred to as the optical tube) with resolution not less than 0.1";
A 360-tooth multi-tooth indexing table (hereinafter referred to as the 360-tooth disk) and a plane mirror;
A 391-tooth multi-tooth indexing table (hereinafter referred to as the 391-tooth disk) and a plane mirror;
23-faceted prism, Level 1;
24-faceted prism, level 1.
3. Test Environment Conditions
Ambient temperature: 20±2℃;
Relative humidity: <70%.
Vibration isolation requirements: The turntable under test shall be placed on a vibration isolation foundation, with no severe vibrations or impacts around it;
Electromagnetic field requirements: There should be no strong electromagnetic interference in the vicinity of the test site.
4. Test Methods
Before the test, install the multi-tooth disk and plane mirror or multi-faceted prism at the center of rotation of the shaft being measured on the turntable. Install the optical tube on the stationary part of the shaft being measured or on a well-isolated foundation, ensuring that the optical axis of the optical tube is perpendicular to the plane mirror or prism face. Start the turntable and ensure that it operates normally and stably under angular position control state.
4.1 Direct Test Method
4.1.1 Angular Positioning Repeatability
The experiment uses a 23-faceted prism or a 391-tooth disk and a plane mirror. Starting from an arbitrary angle position θ₁ of the axis under test, align face I of the prism or the plane mirror with the light tube and record the light tube reading a1i . Then , sequentially give position commands Ai ( i=1,…,23) to rotate the axis under test through the specified angle value of the prism, and record the corresponding light tube reading a1i . Then, starting from θ₁, rotate the axis under test in the opposite direction and repeat the above experiment, recording the corresponding light tube reading a2i . When using a multi-tooth disk, the disk should be rotated in the opposite direction through the angle rotated by the axis of rotation to align the plane mirror with the light tube.
4.1.2 Angular Position Positioning Accuracy
4.1.2.1 Component Test Method
4.1.2.1.1 Indexing accuracy
The experiment uses a 24-faceted prism or a 360-tooth disk and a plane mirror. Starting from position 0 on the digital display of the angular position measurement system of the measured axis, align face I of the prism or position 0 of the multi-tooth disk with the light tube and record the light tube reading a1. Then, sequentially give position commands Ai ( i=1,…,24) to rotate the measured axis through the specified angular position of the prism and record the light tube reading a1i . When using a multi-tooth disk, the disk should be rotated in the opposite direction by the angle rotated by the measured axis until the plane mirror is aligned with the light tube.
4.1.2.1.2 Subdivision Accuracy
Using a small angle measuring instrument, depending on the specific requirements of the selected small angle measuring instrument, its rotating part is mounted on the shaft being measured, and its stationary part is mounted on the stationary part of the shaft being measured or on a good vibration-isolated foundation.
Three angular positions within the 360° range of the measured axis were selected for subdivision testing. The angular position measurement system was used at the 0° position, and the angular positions θm and θn with the maximum positive and negative errors obtained from the indexing accuracy test . The selection of the subdivision angle interval was as follows: when using a 720-pole inductive synchro as the angle measuring element, the subdivision angle interval was 1°, and the number of subdivision points was 17; when using other angle measuring elements, the angle interval was selected as one cycle of subdivision, and the number of subdivision points was not less than 9.
The 0° position subdivision accuracy test starts from the 0° position of the measured axis angular position measurement system. Record the reading b01 of the small angle measuring instrument , and sequentially give position commands Bi ( i=1,…17) to make the measured axis rotate 1°/17 each time, and record the reading b0i of the small angle measuring instrument .
The test method for the position subdivision accuracy of θm and θn is the same as above, and the readings of the small angle measuring instrument are recorded as b1i and b2i respectively .
4.1.2.2 Comprehensive Test Method
The experiment uses a 23-faceted prism or a 391-tooth disc and a plane mirror. Starting from position 0 on the digital display of the angular position measurement system for the measured axis, align face 1 of the prism or position 0 of the disc with the light tube and record the light tube reading C₁. Then, sequentially give position commands Ci ( i=1, …,23) to rotate the measured axis through the angular position specified by the prism, and record the light tube reading Ci . When using a multi-toothed disc, rotate the disc in the opposite direction through the angle rotated by the measured axis to align the plane mirror with the light tube.
4.2 Indirect Experimental Method
4.2.1 Angular Position Positioning Repeatability
4.2.1.1 Angular Position Measurement Repeatability
The angular position measurement repeatability Eα is obtained according to items 4.1 and 5.1 in Method 104.
4.2.1.2 Angular position control repeatability
The angular position control repeatability Eαc is obtained according to items 4.1 and 5.1 in Method 105.
4.2.2 Angular Position Positioning Accuracy
4.2.2.1 Angular position measurement accuracy
The angular position measurement accuracy +Uα and -Uα are obtained according to items 4.2 and 5.2 in Method 104 .
4.2.2.2 Angular position control accuracy
The angular position control accuracy Uαc is obtained according to items 4.2 and 5.2 in Method 105 .
5. Data Processing and Result Evaluation
5.1 Direct Experiment Method
5.1.1 Angular Position Positioning Repeatability
Proceed according to section 5.1 of method 104.
5.1.2 Angular Position Positioning Accuracy
5.1.2.1 Component Test Method
Proceed according to section 5.2.1 of method 104.
5.1.2.2 Comprehensive Test Method
Proceed according to section 5.2.2 of method 104.
5.2 Indirect Experimental Method
5.2.1 Angular Position Positioning Repeatability
5.2.2 Angular Position Positioning Accuracy
The angular position positioning accuracy is +Uαp and -Uαp.
