CN113551825B - Wind power locking disc torque testing device and testing method - Google Patents
Wind power locking disc torque testing device and testing method Download PDFInfo
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
A wind power locking disc torque testing device comprises a testing bracket, a transmission shaft sleeve, a transmission main shaft, a strain sensor, a data acquisition device, a computer and a wind power locking disc; the transmission shaft sleeve is fixedly arranged on the test support, the transmission main shaft is a hollow shaft and is arranged in an inner hole of the transmission shaft sleeve, the strain sensor is fixedly arranged in the inner hole of the transmission main shaft, the data acquisition device is electrically connected with the strain sensor, and the computer is electrically connected with the data acquisition device; the wind power locking disc is arranged on the outer circumference of the transmission shaft sleeve, and positive pressure is generated between the transmission shaft sleeve and the combination surface of the transmission main shaft through interference connection between the outer ring of the locking disc and the inner ring of the locking disc; the wind power locking disc torque testing method comprises the following steps: the method comprises the steps of measuring a strain value of a strain sensor arranged in an inner hole of a transmission main shaft after a wind power locking disc is locked, calculating according to the strain value to obtain positive pressure between the transmission shaft sleeve and the transmission main shaft, and calculating according to the positive pressure to obtain the maximum torque which can be transmitted between the transmission shaft sleeve and the transmission main shaft.
Description
Technical Field
The invention relates to the technical field of maximum torque measurement of wind power locking discs, in particular to a wind power locking disc torque testing device and a wind power locking disc torque testing method.
Background
The measurement of the maximum torque provided by the existing wind power locking disc is completed through a torque experiment loading system, a transmission shaft sleeve and a transmission main shaft which are matched with each other in measurement are required to be manufactured before actual measurement, the transmission shaft sleeve and the transmission main shaft are fixedly arranged on the torque experiment loading system, positive pressure is generated between the joint surface of the transmission shaft sleeve and the transmission main shaft through locking the wind power locking disc to be measured, and further, the torque is transmitted by static friction force between the transmission shaft sleeve and the transmission main shaft; during experimental measurement, gradually increased torque load is continuously applied to the transmission main shaft through the torque experiment loading system until a slipping phenomenon occurs between the transmission shaft sleeve and the transmission main shaft, so that the maximum torque which can be provided by the wind power locking disc to be tested during working is obtained.
The existing wind power locking disc torque testing method has two problems: 1. in the process of designing and shaping, production monitoring and spot inspection before shipment, the wind power locking disc torque test is required, especially, the production monitoring and spot inspection before shipment are required to be continuously carried out, and the transmission shaft sleeve and the transmission main shaft matched with the experiment are required to be scrapped after the experiment is used for a certain number of times, and the wind power locking disc is required to be reprocessed and manufactured, so that the experiment cost is high; 2. in addition, along with the continuous improvement of the power of the wind generating set, the size and the maximum working torque of the wind power locking disc are continuously improved, the maximum loading torque provided by the original torque experiment loading system cannot meet the requirement, so that a new and larger torque experiment loading system has to be built from the reinitiation, the construction investment of the torque experiment loading system and the requirements of the factory building area are huge, the continuous investment of the torque experiment loading system with the larger construction becomes a huge burden of an enterprise, and if the continuous investment of the torque experiment loading system with the larger construction is not carried out, the enterprise faces the dilemma that no experimental equipment is available in design shaping, production monitoring and spot inspection before shipment, and therefore, the dilemma is solved, and the problem to be solved urgently is faced by the wind power locking disc production enterprise.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention discloses a wind power locking disc torque testing device and a testing method; the wind power locking disc torque testing device comprises a testing bracket, a transmission shaft sleeve, a transmission main shaft, a strain sensor, a data acquisition device, a computer and a wind power locking disc; the transmission shaft sleeve is fixedly arranged on the test bracket; the transmission main shaft is a hollow shaft and is arranged in an inner hole of the transmission shaft sleeve; the strain sensor is fixedly arranged in an inner hole of the transmission main shaft; the data acquisition device is electrically connected with the strain sensor, and the computer is electrically connected with the data acquisition device; the wind power locking disc is arranged on the outer circumference of the transmission shaft sleeve, and positive pressure is generated between the transmission shaft sleeve and the combination surface of the transmission main shaft through interference connection between the outer ring of the locking disc and the inner ring of the locking disc; the method for experimentally measuring the maximum torque provided by the wind power locking disc through the wind power locking disc torque testing device comprises the following steps: firstly, measuring a strain value of a strain sensor arranged in an inner hole of a transmission main shaft after a wind power locking disc is locked, then calculating according to the strain value to obtain positive pressure between the transmission shaft sleeve and the transmission main shaft, and finally calculating according to the positive pressure to obtain the maximum torque which can be transmitted between the transmission shaft sleeve and the transmission main shaft.
In order to achieve the aim of the invention, the invention adopts the following technical scheme: a wind power locking disc torque testing device comprises a testing bracket, a transmission shaft sleeve, a transmission main shaft, a strain sensor, a data acquisition device, a computer and a wind power locking disc; the transmission shaft sleeve is fixedly arranged on the test bracket; the transmission main shaft is a hollow shaft and is arranged in an inner hole of the transmission shaft sleeve; the strain sensors are provided with m strain sensors, and the strain sensors are fixedly arranged in an inner hole of the transmission main shaft; the data acquisition device is electrically connected with the m strain sensors, and the computer is electrically connected with the data acquisition device; the wind power locking disc comprises a locking disc outer ring and a locking disc inner ring, and the locking disc outer ring and the locking disc inner ring are in interference connection through a ring conical surface; the wind power locking disc is arranged on the outer circumference of the driving shaft sleeve and is fixedly connected with the driving shaft sleeve through interference connection deformation between the outer ring of the locking disc and the inner ring of the locking disc; the wind power locking disc torque testing device adopts a mode that the transmission shaft sleeve is fixedly connected with the testing support, and is consistent with the connection mode of the transmission shaft sleeve and the testing support of the original torque experiment loading system, so that in the practical implementation process, the main structure of the original torque experiment loading system is not required to be modified, the main structure of the original torque experiment loading system, the data processing system, the processed transmission shaft sleeve and the transmission main shaft can be directly used, the wind power locking disc torque testing device can be built by only adding multi-channel strain data acquisition equipment, and the common platform use of the torque experiment loading system and the torque testing device is realized.
Preferably, the transmission main shaft is fixedly arranged on the test bracket; the wind power locking disc torque testing device adopts a mode that a transmission main shaft is fixedly connected with a testing support, and the mode of connection between the transmission main shaft and the testing support is different from that of an original torque experiment loading system, so that in the practical implementation process, the main structure of the original torque experiment loading system is required to be modified so as to adapt to the connection between the transmission main shaft and the testing support, the rest part can directly use a data processing system of the original torque experiment loading system and a processed transmission shaft sleeve and transmission main shaft, and multi-channel strain data acquisition equipment is added, thereby realizing the system construction of the wind power locking disc torque testing device and the co-platform use of the torque experiment loading system and the torque testing device.
Further, the m strain sensors are equally divided into n groups, and the number of each group of strain sensors is m/n; the n groups of strain sensors are uniformly distributed in the width range of the wind power locking disc along the axis of the transmission main shaft; the strain sensors are grouped and uniformly distributed along the axis of the transmission main shaft, so that the effects of uneven distribution of positive pressure generated between the transmission shaft sleeve and the transmission main shaft in the axis direction after the wind power locking disc is locked are eliminated by a groove structure existing on the outer ring end surface of the locking disc and a flange structure existing on the inner ring end surface of the locking disc.
Further, each group of strain sensors are uniformly distributed and fixedly arranged on the inner hole wall of the transmission main shaft around the axis of the transmission main shaft.
Further, according to the setting sequence of n groups of strain sensors, the phase angle of the strain sensors of the rear group is increased by 180/m degrees relative to that of the strain sensors of the front group; the incremental setting of the distribution phase angles between the strain sensor groups and the groups ensures that all the strain sensors are uniformly distributed around the axis of the transmission main shaft, so as to eliminate the influence of the positions of connecting bolts between the outer ring of the locking disc and the inner ring of the locking disc on the uneven distribution of positive pressure generated between the transmission shaft sleeve and the transmission main shaft around the axis direction; the strain value Y of the strain sensor is obtained by averaging the acquisition results of all the strain sensors when the strain value Y is obtained by actual test.
The wind power locking disc torque testing method comprises the following steps: measuring a strain value Y of a strain sensor arranged in an inner hole of a transmission main shaft after the wind power locking disc is locked, calculating to obtain positive pressure N between the transmission shaft sleeve and the transmission main shaft according to the strain value Y, and calculating to obtain the maximum torque Mt which can be transmitted between the transmission shaft sleeve and the transmission main shaft according to the positive pressure N;
the calculation formula of the maximum torque Mt is:
Mt＝μ*N*R
wherein Mt is the maximum torque which can be transmitted by the transmission shaft sleeve and the transmission main shaft under the action of positive pressure N; wherein mu is the static friction coefficient between the transmission shaft sleeve and the transmission main shaft, which is determined by the processing state of the joint surface of the transmission shaft sleeve and the transmission main shaft, and the specific numerical value is an empirical value; wherein N is positive pressure between the transmission shaft sleeve and the transmission main shaft, and is determined by structural parameters and material performance parameters of the wind power locking disc, the transmission shaft sleeve and the transmission main shaft; wherein the radius of gyration of the joint surface of the R transmission shaft sleeve and the transmission main shaft.
Further, the calculation formula of the positive pressure N between the driving shaft sleeve and the driving main shaft is as follows:
N＝f 0 -1 (K, Y) X, which is the stress strain equation N for thick-walled cylinder theory 0 ＝f 0 -1 (K，Y 0 ) Correcting to obtain;
wherein K is determined by the structural parameters of the transmission main shaft and the performance parameters of materials; x is a correction coefficient;
formula n=f 0 -1 The practical meaning of (K, Y) X is: stress-strain calculation formula N according to thick-wall cylinder theory 0 ＝f 0 -1 (K，Y 0 ) Substituting the actual measured strain value Y into Y 0 Positive pressure N between the transmission shaft sleeve and the transmission main shaft is obtained after the calculation result is corrected; wherein Y is 0 Is a theoretical strain value; wherein N is 0 To be according to the theoretical strain value Y 0 And calculating theoretical positive pressure between the transmission shaft sleeve and the transmission main shaft.
Further, the method for obtaining the correction coefficient X comprises the following steps:
s1, establishing a three-dimensional model of a wind power locking disc, a transmission shaft sleeve and a transmission main shaft in a computer, inputting the three-dimensional model and performance parameters of related materials into the computer, and calculating the strain Y of an inner hole of the transmission main shaft in a simulation manner through the wind power locking disc, the transmission shaft sleeve and the transmission main shaft finite element model 1 ；
S2, carrying out experiments on wind power locking discs, transmission shaft sleeves and transmission main shaft objects with the same structural parameters and material performance parameters to obtain transmission main shaft inner hole strain Y, wherein the supplementary explanation is that the wind power locking discs are products which are produced in quantity and are normally delivered, the transmission shaft sleeves and the transmission main shaft objects are experimental standard parts for production monitoring and spot check before delivery of the matched wind power locking discs, and the maximum transmission torque provided by the wind power locking discs after locking meets the actual use requirement; simulating and calculating the strain Y of the inner hole of the transmission main shaft by using a finite element model 1 Comparing with the experimentally measured strain Y of the inner hole of the transmission main shaft, and correcting the finite element according to the comparison differenceModel, corrected finite element model simulation calculation transmission main shaft inner hole strain Y 1 The absolute value of the difference value of the strain Y of the inner hole of the transmission main shaft measured by the experiment is smaller than the set error; the method comprises the steps that a finite element model is modified and optimized through physical experiment data, so that the established finite element model approaches to an optimal solution;
s3, using the corrected finite element model to simulate and calculate the positive pressure N between the transmission shaft sleeve and the transmission main shaft again 1 Strain Y of inner bore of transmission spindle 1 Strain Y of inner hole of transmission main shaft 1 Substituted into formula N 0 ＝f 0 -1 (K，Y 0 ) Calculating to obtain positive pressure N' between the transmission shaft sleeve and the transmission main shaft; by N', N 1 Calculating to obtain correction coefficient X 1 Correction coefficient X 1 The calculation formula is X 1 ＝N’/N 1 ；
S4, repeating the steps from S1 to S3 by adopting a plurality of groups of different wind power locking discs, transmission shaft sleeves, transmission main shaft structural parameters and material performance parameters to obtain a plurality of correction coefficients X 1 、X 2 、X 3 、......X n Finally, the formula is utilized
Calculating to obtain a correction coefficient X;
the method for obtaining the correction coefficient is characterized in that a finite element model is continuously optimized by a real object, and the simulation calculation result of the optimized finite element model is compared with a stress-strain formula of a thick-wall cylinder theory to finally obtain the correction coefficient of the stress-strain formula; the method can obtain the establishment parameters of the optimized finite element model and the rule of the change of each parameter along with the structural dimension of the wind power locking disc, and is used for guiding the establishment of the finite element model of the wind power locking disc with larger structural dimension, so as to realize the structural design optimization of the wind power locking disc with larger structural dimension and the calculation of correction coefficients; repeating the steps S1 to S4 after the sample trial production of the wind power locking disc with the larger structural size is completed, and further optimizing the correction coefficient; in addition, after the sample trial production of the wind power locking disc with larger structural size is completed, the sample of the wind power locking disc with larger structural size is subjected to proportional load reduction loading test through the existing torque experiment loading system, and the test result is further compared with the finite element model simulation result and the test result of the wind power locking disc torque testing device to confirm, and if necessary, the test result is further corrected; the proportional load-shedding test is as follows: the interference of the fit conical surfaces between the outer ring of the locking disc and the inner ring of the locking disc is reduced by adding the backing ring between the end surface groove of the outer ring of the locking disc and the flange of the inner ring of the locking disc, so that the maximum transmission torque is reduced, and the wind power locking disc with larger structural size can perform torque test experiments on the existing torque experiment loading system; however, it should be noted that the proportional load-shedding test is not a test of the final working state of the wind power locking disc, and therefore, the proportional load-shedding test cannot be used for design shaping, production monitoring and spot check test before shipment of the wind power locking disc.
Preferably, the correction factor X is obtained by:
s1', carrying out a maximum torque loading experiment on an existing wind power locking disc, a transmission shaft sleeve and a transmission main shaft object through a torque experiment loading system to obtain maximum torque Mt; calculating to obtain Mt=mu.N.R by using a formula to obtain positive pressure N between the transmission shaft sleeve and the transmission main shaft;
s2', carrying out stress strain measurement on the wind power locking disc, the transmission shaft sleeve and the transmission main shaft real object with the same structural parameters and material performance parameters to obtain the strain Y of the inner hole of the transmission main shaft; substituting the strain Y of the inner hole of the transmission main shaft into a formula N 0 ＝f 0 -1 (K，Y 0 ) Calculating to obtain positive pressure N' between the transmission shaft sleeve and the transmission main shaft; calculating by N', N to obtain correction coefficient X 1 Correction coefficient X 1 The calculation formula is X 1 ＝N’/N；
S3', repeating the steps of S1' and S2' by adopting a plurality of groups of different wind power locking discs, transmission shaft sleeves, transmission main shaft structural parameters and material performance parameters to obtain a plurality of correction coefficients X 1 、X 2 、X 3 、......X n Finally, the formula is utilized
Calculating to obtain a correction coefficient X;
the method for obtaining the correction coefficient is essentially to compare the actual measurement result of the object with the stress-strain formula of the thick-wall cylinder theory to finally obtain the correction coefficient of the stress-strain formula; compared with the former method, the method omits the process of establishing finite element model simulation calculation, has lower cost, is not helpful to the structural design of the wind power locking disk with larger structural size, and can realize the calculation result of the correction coefficient of the wind power locking disk with larger structural size by carrying out the proportional load-reducing test on the sample of the wind power locking disk with larger structural size through the existing torque experiment loading system.
Further, the correction coefficient X is correspondingly set with a plurality of X according to the inner diameter range of the inner ring of the locking disc i The method comprises the steps of carrying out a first treatment on the surface of the For a plurality of correction coefficients X i Performing secondary curve fitting to obtain a correction coefficient secondary fitting curve; using the formula n=f 0 -1 (K, Y) X calculating positive pressure between the driving shaft sleeve and the driving main shaft according to the inner diameter of the corresponding locking disc inner ring, and calculating from the correction factor quadratic fit curve to obtain the correction factor
Correction coefficient->
The strain value Y is substituted into the formula n=f 0 -1 In (K, Y) X, calculating a positive pressure N between the outdrive and the main transmission shaft, and substituting the positive pressure N between the outdrive and the main transmission shaft into the formula mt=μ×n×r to calculate a maximum torque Mt; the correction coefficient X is set in a segmented mode, and therefore accuracy of wind power locking disc torque testing can be further improved.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the invention discloses a wind power locking disc torque testing device and a testing method; the wind power locking disc torque testing device comprises a testing bracket, a transmission shaft sleeve, a transmission main shaft, a strain sensor, a data acquisition device, a computer and a wind power locking disc; the transmission shaft sleeve is fixedly arranged on the test bracket; the transmission main shaft is a hollow shaft and is arranged in an inner hole of the transmission shaft sleeve; the strain sensor is fixedly arranged in an inner hole of the transmission main shaft; the data acquisition device is electrically connected with the strain sensor, and the computer is electrically connected with the data acquisition device; the wind power locking disc is arranged on the outer circumference of the transmission shaft sleeve, and positive pressure is generated between the transmission shaft sleeve and the combination surface of the transmission main shaft through interference connection between the outer ring of the locking disc and the inner ring of the locking disc; the method for experimentally measuring the maximum torque provided by the wind power locking disc through the wind power locking disc torque testing device comprises the following steps: firstly, measuring a strain value of a strain sensor arranged in an inner hole of a transmission main shaft after a wind power locking disc is locked, then calculating according to the strain value to obtain positive pressure between the transmission shaft sleeve and the transmission main shaft, and finally calculating according to the positive pressure to obtain the maximum torque which can be transmitted between the transmission shaft sleeve and the transmission main shaft; the wind power locking disc torque testing device is used for testing the locking disc torque, and the driving shaft sleeve and the driving main shaft which are matched with the wind power locking disc torque testing device are not relatively slid in the experimental process, so that the wind power locking disc torque testing device can be repeatedly used for production monitoring and spot check before shipment for a long time without influencing experimental results, thereby saving the cost of repeatedly processing and manufacturing the driving shaft sleeve and the driving main shaft in the past and greatly reducing the cost of wind power locking disc torque testing; in addition, the wind power locking disc torque testing device has the advantages of small investment and small occupied area, and meanwhile, the testing method completely meets the requirements of the wind power locking disc testing precision in the existing size and larger size range in the future, so that the problem of huge burden caused by continuous investment and construction of a larger torque experiment loading system of a wind power locking disc production enterprise is successfully solved.
Drawings
FIG. 1 is a schematic diagram of a wind power locking disk torque testing device;
FIG. 2 is a second schematic structural diagram of a wind power locking disk torque testing device;
FIG. 3 is a schematic view of a wind power locking disk.
In the figure: 1. testing a bracket; 2. a driving sleeve; 3. a transmission main shaft; 4. a strain sensor; 5. a data acquisition device; 6. a computer; 7. wind power locking disc; 7.1, locking the outer ring of the disc; 7.2, locking the inner ring of the disc.
Detailed Description
The invention will be explained in more detail by the following examples, the purpose of which is to protect all technical improvements within the scope of the invention.
The wind power locking disc torque testing device comprises a testing bracket 1, a driving shaft sleeve 2, a driving main shaft 3, a strain sensor 4, a data acquisition device 5, a computer 6 and a wind power locking disc 7; the driving shaft sleeve 2 is fixedly arranged on the test bracket 1; the transmission main shaft 3 is a hollow shaft and is arranged in an inner hole of the transmission shaft sleeve 2; the number of the strain sensors 4 is thirty, the thirty strain sensors 4 are equally divided into two groups, the number of each group of strain sensors 4 is fifteen, the two groups of strain sensors 4 are evenly distributed along the axis of the transmission main shaft 3 and are arranged in the width range of the wind power locking disc 7 at equal intervals, and the strain sensors are fixedly arranged in the inner hole of the transmission main shaft 3; each group of strain sensors 4 are uniformly distributed and fixedly arranged on the inner hole wall of the transmission main shaft 3 around the axis of the transmission main shaft 3, and the phase difference between the two groups of strain sensors 4 is 12 degrees; the data acquisition device 5 is electrically connected with 30 strain sensors 4, and the computer 6 is electrically connected with the data acquisition device 5; the wind power locking disc 7 comprises an outer locking disc ring 7.1 and an inner locking disc ring 7.2, and the outer locking disc ring 7.1 and the inner locking disc ring 7.2 are in interference connection through annular conical surfaces; the wind power locking disc 7 is arranged on the outer circumference of the driving shaft sleeve 2 and is fixedly connected with the driving shaft sleeve 2 through interference connection deformation between the outer ring 7.1 of the tightening disc and the inner ring 7.2 of the locking disc.
The wind power locking disc torque testing device is characterized in that a transmission main shaft 3 is fixedly arranged on a testing bracket 1; the number of the strain sensors 4 is thirty, the thirty strain sensors 4 are equally divided into three groups, the number of each group of strain sensors 4 is 10, the three groups of strain sensors 4 are evenly distributed and arranged in the width range of the wind power locking disc 7 at equal intervals along the axis of the transmission main shaft 3, and the three groups of strain sensors 4 are fixedly arranged in the inner hole of the transmission main shaft 3; each group of strain sensors 4 are uniformly distributed and fixedly arranged on the inner hole wall of the transmission main shaft 3 around the axis of the transmission main shaft 3, and the two groups of strain sensors 4 are different by 12 degrees.
The wind power locking disc torque testing method comprises the following steps: measuring a strain value Y of a strain sensor 4 arranged in an inner hole of the transmission main shaft 3 after the wind power locking disc 7 is locked, calculating according to the strain value Y to obtain positive pressure N between the transmission shaft sleeve 2 and the transmission main shaft 3, and calculating according to the positive pressure N to obtain the maximum torque Mt which can be transmitted between the transmission shaft sleeve 2 and the transmission main shaft 3;
the calculation formula of the maximum torque Mt is:
Mt＝μ*N*R
wherein Mt is the maximum torque which can be transmitted by the driving shaft sleeve 2 and the driving main shaft 3 under the action of positive pressure N; wherein mu is the static friction coefficient between the transmission shaft sleeve 2 and the transmission main shaft 3, which is determined by the processing state of the joint surface of the transmission shaft sleeve 2 and the transmission main shaft 3, and the specific numerical value is an empirical value; wherein N is positive pressure between the transmission shaft sleeve 2 and the transmission main shaft 3, and is determined by structural parameters and material performance parameters of the wind power locking disc 7, the transmission shaft sleeve 2 and the transmission main shaft 3; wherein the radius of gyration of the joint surface of the R transmission shaft sleeve 2 and the transmission main shaft 3;
the calculation formula of the positive pressure N between the driving shaft sleeve 2 and the driving main shaft 3 is as follows:
N＝f 0 -1 (K，Y)X
wherein K is determined by the structural parameters and the material performance parameters of the transmission main shaft 3; x is a correction coefficient;
formula n=f 0 -1 The practical meaning of (K, Y) X is: stress-strain calculation formula N according to thick-wall cylinder theory 0 ＝f 0 -1 (K，Y 0 ) Substituting the actual measured strain value Y into Y 0 Positive pressure N between the transmission shaft sleeve 2 and the transmission main shaft 3 is obtained after the calculation result is corrected; wherein Y is 0 Is a theoretical strain value; wherein N is 0 To be according to the theoretical strain value Y 0 The calculated theoretical positive pressure between the outdrive 2 and the drive spindle 3.
The correction coefficient X is obtained by the following steps:
s1, establishing a three-dimensional model of a wind power locking disc 7, a driving shaft sleeve 2 and a driving main shaft 3 in a computer, and combining the three-dimensional model with related materialsThe performance parameters of the (2) are input into a computer, and the strain Y of the inner hole of the transmission main shaft 3 is calculated through simulation by a wind power locking disc 7, a transmission shaft sleeve 2 and a finite element model of the transmission main shaft 3 1 ；
S2, carrying out experiments on the wind power locking disc 7, the transmission shaft sleeve 2 and the transmission main shaft 3 with the same structural parameters and material performance parameters to obtain the strain Y of the inner hole of the transmission main shaft 3; simulating and calculating the strain Y of the inner hole of the transmission main shaft 3 by using a finite element model 1 Comparing with the experimentally measured strain Y of the inner hole of the transmission main shaft 3, correcting the finite element model according to the comparison difference, and simulating the calculated strain Y of the inner hole of the transmission main shaft 3 by the corrected finite element model 1 The absolute value of the difference value of the strain Y of the inner hole of the transmission main shaft 3 measured by experiments is smaller than the set error;
s3, using the corrected finite element model to simulate and calculate the positive pressure N between the driving shaft sleeve 2 and the driving main shaft 3 again 1 Strain Y in the bore of the drive spindle 3 1 Strain Y in inner hole of transmission main shaft 3 1 Substituted into formula N 0 ＝f 0 -1 (K，Y 0 ) Calculating to obtain positive pressure N' between the driving shaft sleeve 2 and the driving main shaft 3; by N', N 1 Calculating to obtain correction coefficient X 1 Correction coefficient X 1 The calculation formula is X 1 ＝N’/N 1 ；
S4, repeating the steps S1 to S3 by adopting a plurality of groups of different wind power locking discs 7, transmission shaft sleeves 2, structural parameters of a transmission main shaft 3 and material performance parameters to obtain a plurality of correction coefficients X 1 、X 2 、X 3 、......X n Finally, the formula is utilized
Calculating to obtain a correction coefficient X;
the correction coefficient X is correspondingly set with a plurality of X according to the inner diameter range of the inner ring 7.2 of the locking disc i The method comprises the steps of carrying out a first treatment on the surface of the For a plurality of correction coefficients X i Performing secondary curve fitting to obtain a correction coefficient secondary fitting curve; using the formula n=f 0 -1 (K, Y) X calculating the positive pressure between the outdrive 2 and the main drive 3, the inner diameter of the corresponding inner ring 7.2 of the locking disk is correctedCalculating positive coefficient quadratic fit curve to obtain correction coefficient
Correction coefficient->
The strain value Y is substituted into the formula n=f 0 -1 In (K, Y) X, a positive pressure N between the outdrive 2 and the main transmission shaft 3 is calculated, and then the positive pressure N between the outdrive 2 and the main transmission shaft 3 is substituted into the formula mt=μ×n×r to calculate the maximum torque Mt.
Another method for obtaining the correction factor X is:
s1', carrying out a maximum torque loading experiment on the existing wind power locking disc 7, the transmission shaft sleeve 2 and the transmission main shaft 3 through a torque experiment loading system to obtain maximum torque Mt; calculating to obtain Mt=mu.N.R by using a formula to obtain positive pressure N between the transmission shaft sleeve 2 and the transmission main shaft 3;
s2', carrying out stress strain measurement on the wind power locking disc 7, the transmission shaft sleeve 2 and the transmission main shaft 3 with the same structural parameters and material performance parameters to obtain the strain Y of the inner hole of the transmission main shaft 3; substituting the strain Y of the inner hole of the transmission main shaft 3 into a formula N 0 ＝f 0 -1 (K，Y 0 ) Calculating to obtain positive pressure N' between the driving shaft sleeve 2 and the driving main shaft 3; calculating by N', N to obtain correction coefficient X 1 Correction coefficient X 1 The calculation formula is X 1 ＝N’/N；
S3', adopting a plurality of groups of different wind power locking discs 7, transmission shaft sleeves 2, structural parameters of a transmission main shaft 3 and material performance parameters, repeating the steps of S1' and S2', and obtaining a plurality of correction coefficients X 1 、X 2 、X 3 、......X n Finally, the formula is utilized
And calculating to obtain a correction coefficient X.
The invention is not described in detail in the prior art.
Claims (6)
1. A wind-powered electricity generation locking dish moment of torsion testing arrangement, characterized by: the device comprises a test bracket (1), a transmission shaft sleeve (2), a transmission main shaft (3), a strain sensor (4), a data acquisition device (5), a computer (6) and a wind power locking disc (7); the transmission shaft sleeve (2) is fixedly arranged on the test bracket (1); the transmission main shaft (3) is a hollow shaft and is arranged in an inner hole of the transmission shaft sleeve (2); the strain sensors (4) are provided with m number, and are fixedly arranged in the inner hole of the transmission main shaft (3); the data acquisition device (5) is electrically connected with the m strain sensors (4), and the computer (6) is electrically connected with the data acquisition device (5); the wind power locking disc (7) comprises an outer locking disc ring (7.1) and an inner locking disc ring (7.2), and the outer locking disc ring (7.1) and the inner locking disc ring (7.2) are in interference connection through ring conical surfaces; the wind power locking disc (7) is arranged on the outer circumference of the transmission shaft sleeve (2), and is fixedly connected with the transmission shaft sleeve (2) through interference connection deformation between the outer ring (7.1) of the locking disc and the inner ring (7.2) of the locking disc;
the m strain sensors (4) are equally divided into n groups, and the number of each group of strain sensors (4) is m/n; the n groups of strain sensors (4) are uniformly distributed in the width range of the wind power locking disc (7) along the axis of the transmission main shaft (3);
each group of strain sensors (4) is uniformly distributed and fixedly arranged on the inner hole wall of the transmission main shaft (3) around the axis of the transmission main shaft (3).
2. The wind power locking disc torque testing device according to claim 1, wherein: the transmission main shaft (3) is fixedly arranged on the test bracket (1).
3. The wind power locking disk torque testing device according to claim 1 or 2, characterized in that: the phase angle of the strain sensor (4) of the rear group is increased by 180/m degrees relative to that of the strain sensor (4) of the front group according to the arrangement sequence of the strain sensors (4) of the n groups.
4. The wind power locking disc torque testing method based on the wind power locking disc torque testing device of claim 1 is characterized by comprising the following steps: measuring a strain value Y of a strain sensor (4) arranged in an inner hole of a transmission main shaft (3) after a wind power locking disc (7) is locked, calculating according to the strain value Y to obtain a positive pressure N between the transmission shaft sleeve (2) and the transmission main shaft (3), and calculating according to the positive pressure N to obtain a maximum torque Mt which can be transmitted between the transmission shaft sleeve (2) and the transmission main shaft (3);
the calculation formula of the maximum torque Mt is:
Mt＝μ*N*R
wherein Mt is the maximum torque which can be transmitted under the action of positive pressure N of the driving shaft sleeve (2) and the driving main shaft (3); wherein mu is the static friction coefficient between the transmission shaft sleeve (2) and the transmission main shaft (3), and is determined by the processing state of the joint surfaces of the transmission shaft sleeve (2) and the transmission main shaft (3), and the specific numerical value is an empirical value; wherein N is positive pressure between the transmission shaft sleeve (2) and the transmission main shaft (3), and is determined by structural parameters and material performance parameters of the wind power locking disc (7), the transmission shaft sleeve (2) and the transmission main shaft (3); wherein R is the radius of gyration of the joint surface of the transmission shaft sleeve (2) and the transmission main shaft (3);
the calculation formula of the positive pressure N between the driving shaft sleeve (2) and the driving main shaft (3) is as follows:
N＝f 0 -1 (K,Y)X
wherein K is determined by the structural parameters and the material performance parameters of the transmission main shaft (3); x is a correction coefficient;
formula n=f 0 -1 The practical meaning of (K, Y) X is: stress-strain calculation formula N according to thick-wall cylinder theory 0 ＝f 0 -1 (K,Y 0 ) Substituting the actual measured strain value Y into Y 0 Positive pressure N between the transmission shaft sleeve (2) and the transmission main shaft (3) is obtained after the calculation result is corrected; wherein Y is 0 Is a theoretical strain value; wherein N is 0 To be according to the theoretical strain value Y 0 The theoretical positive pressure between the transmission shaft sleeve (2) and the transmission main shaft (3) is calculated;
the correction coefficient X is obtained by the following steps:
s1, establishing a three-dimensional model of a wind power locking disc (7), a transmission shaft sleeve (2) and a transmission main shaft (3) in a computer, inputting the three-dimensional model and performance parameters of related materials into the computer, and calculating the inner hole strain Y of the transmission main shaft (3) through simulation by the wind power locking disc (7), the transmission shaft sleeve (2) and the transmission main shaft (3) finite element model 1 ；
S2, for the same structural parametersAnd the wind power locking disc (7), the transmission shaft sleeve (2) and the transmission main shaft (3) of the material performance parameters are subjected to experiments to obtain the inner hole strain Y of the transmission main shaft (3); simulating the inner hole strain Y of the transmission main shaft (3) calculated by a finite element model 1 Comparing with the experimentally measured inner hole strain Y of the transmission main shaft (3), correcting the finite element model according to the comparison difference, and simulating the calculated inner hole strain Y of the transmission main shaft (3) by the corrected finite element model 1 The absolute value of the difference value of the strain Y of the inner hole of the transmission main shaft (3) measured by experiments is smaller than the set error;
s3, using the corrected finite element model to simulate and calculate the positive pressure N between the transmission shaft sleeve (2) and the transmission main shaft (3) again 1 Strain Y of inner hole of transmission main shaft (3) 1 Strain Y of inner hole of transmission main shaft (3) 1 Substituted into formula N 0 ＝f 0 -1 (K,Y 0 ) Calculating to obtain positive pressure N' between the transmission shaft sleeve (2) and the transmission main shaft (3); by N', N 1 Calculating to obtain correction coefficient X 1 Correction coefficient X 1 The calculation formula is X 1 ＝N ’ /N 1 *X 1 ；
S4, repeating the steps S1 to S3 by adopting a plurality of groups of different wind power locking discs (7), transmission shaft sleeves (2), structural parameters of a transmission main shaft (3) and material performance parameters to obtain a plurality of correction coefficients X 1 、X 2 、X 3 、......X n Finally, the formula x= Σis used j＝1 n ＝X j And/n to obtain a correction coefficient X.
5. The method for testing the torque of the wind power locking disc according to claim 4, wherein the method comprises the following steps: the correction coefficient X is obtained by the following steps:
s1', carrying out a maximum torque loading experiment on the existing wind power locking disc (7), the transmission shaft sleeve (2) and the transmission main shaft (3) through a torque experiment loading system to obtain maximum torque Mt; calculating to obtain Mt=mu.N.R by using a formula to obtain positive pressure N between the transmission shaft sleeve (2) and the transmission main shaft (3);
s2', the wind power locking disc (7), the transmission shaft sleeve (2) and the transmission main shaft (3) are in real state for the same structural parameters and material performance parametersStress strain measurement is carried out on the object to obtain the inner hole strain Y of the transmission main shaft (3); substituting the strain Y of the inner hole of the transmission main shaft (3) into a formula N 0 ＝f 0 -1 (K,Y 0 ) Calculating to obtain positive pressure N' between the transmission shaft sleeve (2) and the transmission main shaft (3); calculating by N', N to obtain correction coefficient X 1 Correction coefficient X 1 The calculation formula is X 1 ＝N ’ /N；
S3', adopting a plurality of groups of different wind power locking discs (7), a transmission shaft sleeve (2), structural parameters of a transmission main shaft (3) and material performance parameters, repeating the steps of S1' and S2', and obtaining a plurality of correction coefficients X 1 、X 2 、X 3 、......X n Finally, the formula x= Σis used j＝1 n ＝X j And/n to obtain a correction coefficient X.
6. The method for testing the torque of the wind power locking disc according to claim 5, wherein the method comprises the following steps: the correction coefficient X is correspondingly set with a plurality of X according to the inner diameter range of the inner ring (7.2) of the locking disc i The method comprises the steps of carrying out a first treatment on the surface of the For a plurality of correction coefficients X i Performing secondary curve fitting to obtain a correction coefficient secondary fitting curve; using the formula n=f 0 -1 (K, Y) X calculating the positive pressure between the driving shaft sleeve (2) and the driving main shaft (3), and calculating the correction coefficient X from the correction coefficient quadratic fit curve according to the inner diameter of the corresponding locking disc inner ring (7.2) i d Will correct coefficient X i d The strain value Y is substituted into the formula n=f 0 -1 In (K, Y) X, a positive pressure N between the outdrive (2) and the main transmission shaft (3) is calculated, and then the positive pressure N between the outdrive (2) and the main transmission shaft (3) is substituted into the formula mt=μ×n×r, and the maximum torque Mt is calculated.
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| CN201464097U (en) * | 2009-07-29 | 2010-05-12 | 洛阳豪智机械有限公司 | Wind power locking plate test bed |
| CN102298656B (en) * | 2011-06-24 | 2013-04-17 | 太原科技大学 | Method for checking intensity of wind power locking disk |
| CN104392077B (en) * | 2014-12-16 | 2018-09-28 | 太原重工股份有限公司 | Wind-power locking disc and its determination method for transmitting torque |
| CN207964138U (en) * | 2018-03-23 | 2018-10-12 | 洛阳豪智机械有限公司 | A kind of wind-power locking disc experimental rig |
| TWI658260B (en) * | 2018-05-23 | 2019-05-01 | 中國鋼鐵股份有限公司 | Torque measurement method |
| CN216012556U (en) * | 2021-07-14 | 2022-03-11 | 洛阳豪智机械有限公司 | Wind-powered electricity generation locking dish moment of torsion testing arrangement |
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