CN108791968B - Apparatus and method for determining circumferential wear location of a rotating mechanism - Google Patents
Apparatus and method for determining circumferential wear location of a rotating mechanism Download PDFInfo
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- CN108791968B CN108791968B CN201810584454.6A CN201810584454A CN108791968B CN 108791968 B CN108791968 B CN 108791968B CN 201810584454 A CN201810584454 A CN 201810584454A CN 108791968 B CN108791968 B CN 108791968B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention relates to a device for determining the circumferential wear position of a rotating mechanism, comprising: a wireless angular velocity module configured to measure an angular velocity of the rotating mechanism and wirelessly transmit the measured angular velocity to the receiving and post-processing module; an angle acquisition and output module configured to measure an absolute angle of the rotating mechanism and transmit the measured absolute angle to the receiving and post-processing module; and a receiving and post-processing module configured to receive the measured angular velocity and absolute angle and to calculate a circumferential wear position of the rotating mechanism from the angular velocity and absolute angle. The invention also relates to a corresponding method. By the method and the device, the circumferential abrasion position of the rotating mechanism can be accurately determined in real time, so that the risk of equipment failure caused by excessive abrasion is reduced.
Description
Technical field
Present invention relates in general to satellite failure security fields, in particular to a kind of for determining the week of rotating mechanism
Device and a kind of method of the circumferential abration position of determining rotating mechanism to abration position.
Background technique
The main shape that moment of friction becomes larger, clamping stagnation is the in-orbit failure of the spatial rotationals such as space turntable, antenna, mechanical arm mechanism
Formula is reflection rotating mechanism operating condition and the important indicator in service life.For spatial rotational mechanism, how to be carried out in ground test
Product screening and reliability evaluation, for finding that mechanism product initial failure reduces transmitting and in-orbit loss with important in time
Meaning.
Currently, rotating mechanism measurement of friction torque scheme mainly has the mensurations such as weight measurement method, force sensor.Counterweight power
It is usually used in starting measurement of friction torque, but counterweight measuring accuracy is easy by minimum counterbalance mass and tester's subjective impact, and
Force sensor is measured to test product additional forces, is often limited by test product shape and surface contact conditions.These measurements
Method is difficult to realize the real-time measurement of rotating mechanism dynamic friction torque.
Summary of the invention
The task of the present invention is a kind of devices for the circumferential abration position for providing determining rotating mechanism and a kind of determination to turn
The method of the circumferential abration position of motivation structure can axis that is real-time, accurately determining rotating mechanism by described device or method
To abration position, to reduce because excessive wear leads to the risk of equipment fault.
In the first aspect of the present invention, foregoing task by a kind of device of the circumferential abration position of determining rotating mechanism come
It solves, which includes:
Without angular velocity module, it is configured as the angular speed of measurement rotating mechanism and by measured angular speed with nothing
Line mode is transferred to reception and post-processing module；
Angle acquisition and output module, are configured as the absolute angle of measurement rotating mechanism and will be measured absolute
Angle is transferred to reception and post-processing module；And
Reception and post-processing module, are configured as receiving measured angular speed and absolute angle and according to the angle
Speed and absolute angle calculate the circumferential abration position of rotating mechanism.
It is provided in a preferred embodiment of the invention, the no angular velocity module includes:
Gyroscope is configured as the angular speed of measurement rotating mechanism；
Wireless forwarding module is configured as measured angular speed being sent wirelessly to reception and post-processing mould
Block；
Lithium battery is configured to supply power supply；
Secondary power supply module is configured as the voltage of lithium battery being converted into the operating voltage of gyroscope and wireless respectively
The operating voltage of forwarding module；And
Charging interface is configured as providing charging interface for lithium battery.
It provides in another preferred embodiment of the invention, angle acquisition includes: with output module
Circular gratings are arranged on rotating mechanism in order to provide Moire fringe；
Angular displacement measuring circuit is configured as calculating the absolute angle of rotational structure according to the Moire fringe of Circular gratings；And
Power supply module is configured as providing power supply for angular displacement measuring circuit.
It is provided in another preferred embodiment of the invention, reception includes: with post-processing module
Ground receiver computer, be configured as according to received angular speed and absolute angle calculate week of rotating mechanism
To abration position.
It is provided in an expansion scheme of the invention, gyroscope passes through universal asynchronous receiving-transmitting transmitter UART protocol and nothing
The communication of line forwarding module；And/or
Angle acquisition is communicated by UART protocol with reception with post-processing module with output module.
Provided in a preferred embodiment of the invention, receive with post-processing module also its be configured as executing it is uniaxial or more
The stability test of axis rotating mechanism and/or vibration noise spectrum analysis.
It provides in another preferred embodiment of the invention, angle acquisition and output module include absolute optical code disc.
It is provided in another preferred embodiment of the invention, angle acquisition and output module include increment photoelectric code disk and light
Electric switch, wherein determining zero-bit by optoelectronic switch.
It provides in another preferred embodiment of the invention, angle acquisition and output module are configured as by by no line angle
Acceleration module output angular velocity is integrated to determine absolute angle.
In the second aspect of the present invention, foregoing task passes through a kind of for determining the side of the circumferential abration position of rotating mechanism
Method solves, and this method includes the following steps:
The revolving speed of rotating mechanism is adjusted to working speed and closes the driving motor of rotating mechanism；
With the angular speed of the first frequency acquisition measurement rotating mechanism；
With the absolute angle of the first frequency acquisition measurement rotating mechanism；
Angular velocity carries out linear fit to determine angular acceleration；
Measured absolute angle and identified angular acceleration are subjected to Data Matching alignment；
Moment of friction is determined according to the absolute angle of matching alignment and angular acceleration；
Stop the measurement of angular speed and absolute angle when angular speed is lower than threshold value；
Moment of friction and absolute angle array are ranked up according to the size of absolute angle；
Determine the regional location that moment of friction becomes larger；And
Circumferential abration position is determined according to the regional location.
The present invention includes at least following the utility model has the advantages that (1) by the invention it is possible to determine rotating mechanism precisely in real time
Circumferential abration position, to reduce the risk because of equipment fault caused by excessive wear；(2) present invention uses non-contact measurement
And without applying external force, therefore it can exclude to influence the external action of accuracy；(3) present invention by angular speed and absolute angle come
It determines circumferential direction abration position, can achieve higher accuracy；(4) through the invention, rotating mechanism can also additionally be executed
Stability test and/or the test such as vibration noise spectrum analysis.
Detailed description of the invention
With reference to specific embodiment, the present invention is further explained with reference to the accompanying drawing.
Fig. 1 shows according to the present invention for determining the block diagram of the device of the circumferential abration position of rotating mechanism；
Fig. 2 shows the structural schematic diagrams of wireless gyroscope；
Attached drawing 3 shows system software test block diagram；
Attached drawing 4 shows the display interface of parsing and the poster processing soft data；
Attached drawing 5 shows the display interface of parsing and the poster processing soft moment of friction；
Attached drawing 6 shows the friction torque test curve at the circumferential different location of single axle table；And
Attached drawing 7 shows the spectral characteristic of single axle table.
Specific embodiment
It should be pointed out that each component in each attached drawing may be shown in which be exaggerated in order to illustrate, and it is not necessarily ratio
Example is correctly.In the drawings, identical appended drawing reference is equipped with to the identical component of identical or function.
In the present invention, unless otherwise indicated, " on being arranged in ... ", " being arranged in ... top " and " on being arranged in ... "
Do not exclude the case where there are intermediaries therebetween.
In the present invention, each embodiment is intended only to illustrate the solution of the present invention, and is understood not to restrictive.
In the present invention, unless otherwise indicated, quantifier "one", " one " and the scene for not excluding element.
It is also noted herein that in an embodiment of the present invention, for it is clear, for the sake of simplicity, might show only one
Sub-unit or component, but those skilled in the art are it is understood that under the teachings of the present invention, it can be according to concrete scene
Need to add required component or component.
It is an object of the invention to overcome the above-mentioned deficiency of the prior art, provide a kind of based on wireless gyroscope and Circular gratings
The measurement of rotating mechanism dynamic friction torque system, pass through the nothing that WIFI and gyroscope realize the rotational angular velocity of rotating mechanism
Line measurement and transmission, rotating mechanism angle of rotation angle value acquisition, then by data analysing terminal software to rotational angular velocity
Data fitting is carried out, by the way that angle of rotation angle value and rotational angular velocity data are carried out convergence analysis, can determine 360 degree of rotations
The dynamic friction torque and rotating mechanism that bearing, conducting slip ring etc. are uniaxial and multi-axis turning mechanism is at circumferential different location turn
Dynamic circumferential direction abration position.
It should be pointed out that although the present invention is illustrated based on gyroscope and Circular gratings, it should be appreciated that of the invention
It is without being limited thereto, but can using the means of other measurement angular speed other than gyroscope, such as vibration acceleration sensor,
And the means of other measurement absolute angles other than Circular gratings can be used, such as code-disc.
The present invention is further described using technical solution with reference to the accompanying drawing.
Fig. 1 shows the block diagram of the device 100 of the circumferential abration position according to the present invention for being used to determine rotating mechanism, should
Device 100 can support the wear assessment of most three axis rotating mechanisms.Device 100 is adopted including wireless gyro module 101, angle
Collection and output module 102, reception and post-processing module 103.Wireless gyroscope mainly includes gyroscope 104, lithium battery 105, two
Secondary source 106, wireless forwarding module 107.Lithium battery 105 can be charged by charging interface, secondary power supply module 106
(DCDC) operating voltage that the voltage that lithium battery 105 provides can be converted to gyroscope 104 and wireless forwarding module 107, from
And realize the power supply and wireless data output of wireless gyro module 101.Angle acquisition and output module 102 mainly include circle light
Grid 110, power supply module 108 and angular displacement measuring circuit 109.Angular displacement measuring circuit 109 incudes Circular gratings 110 by light sensor in reading head
Moire fringe intensity variation, angular displacement is converted into digital pulse signal, by processor group packet processing after, pass through
UART interface output.Receive mainly includes ground receiver computer 112 and parsing and the poster processing soft with post-processing module 103
111, wherein parsing and the poster processing soft 111 may be mounted on ground receiver computer 112.It receives and post-processing module 103
Wireless data transmission is realized by wireless network card and wireless gyro module 101, is received by wired UART interface by angle
The current absolute angle for the rotating mechanism that acquisition is measured with output module 102.Parsing and the poster processing soft 111 are by the data of acquisition
Carry out data processing and visualization output.
Fig. 2 shows wireless gyro mechanical construction drawings, wherein 201 connect indicator light for gyro, 202 is currently electric for gyroscope
Display panel is measured, 203 be lithium battery charging interface, and 204 switch for wireless gyroscope.
Attached drawing 3 shows system software test block diagram.As shown, the device of the invention 100 is in addition to can determine rotation
Other than the circumferential abration position of mechanism, additionally it is possible to execute uniaxial or multi-axis turning mechanism stability test and/or vibration noise
Spectrum analysis.
It is illustrated below with reference to data handling procedure of the Fig. 4 to Fig. 7 to parsing and the poster processing soft 111.
Parsing and the poster processing soft 111 include that display interface 400 is arranged in software parameter, as shown in Figure 4.Name an application
Example is illustrated the software interface of Fig. 4: be arranged by communication configuration 401 to 403 interface parameters, baud rate, IP address,
The parameters such as server end slogan, gyro constant multiplier are arranged file store path by 404 " browsings ", complete setting.Setting
It can be generated by configuration file mode, read profile parameters automatically after software operation and complete setting.Click keys 405
After " opening equipment ", wireless gyroscope angular velocity data is received, key 405 becomes " off device ", continues click keys 405
After " off device ", stop data acquisition, sampled value is the rotating mechanism angle measurement of Circular gratings acquisition.Angular speed, angle
Frequency acquisition be 1KHz.
Software 111 has the test of rotating mechanism stability of rotation, fretting wear assessment, vibration noise spectrum analysis function.
Stability of rotation statistics turns according to the time that 409 settings need to count in Fig. 4, setting rotating mechanism revolving speed to work
Speed, after stable rotation, click keys 410 " stationarity statistics " can calculate maximum value Vmax, the revolving speed minimum value of current rotating speed
Vmin, deviation peak-to-peak value Vp-p count 3 times of root-mean-square values of current rotating speed after the completion of test.
Vp-p=Vmax-Vmin (1)
As shown in Figures 4 to 6, for spatial rotational mechanism, rotating mechanism turns for rotating mechanism fretting wear analysis
Dynamic inertia emulates to obtain often through inertia platform precise measurement or by 3 d modeling software, 407 setting rotations in 4 with reference to the accompanying drawings
The measurement method of inertia value, moment of friction and abrasion analysis stops method using cunning, avoids control moment adjustment to rotating mechanism friction
Driving motor is exported and is closed, rotating mechanism is made only to rub by the influence of torgue measurement, setting rotating mechanism revolving speed to working speed
It wipes and is decelerated to stalling under moment loading, click 408 buttons in Fig. 4 and carry out moment of friction and abration position calculating, software is pressed automatically
Once linear fitting is carried out to gyroscope acquisition magnitude of angular velocity such as 10Hz as usual, the straight slope of fitting is angular acceleration values,
The moment of friction of rotating mechanism is calculated according to following formula.
M=J × ω&+M0 (3)
In formula:
The pivoting friction torque of M --- rotating mechanism；
The rotary inertia of J --- rotating mechanism；
ω&--- the angular acceleration of rotating mechanism；
M0--- the disturbance torques such as air drag；It can be ignored；
Such as attached drawing, the angle of the 1KHz of acquisition is carried out Data Matching with 1KHz angular speed and is aligned by software, software initialization
After the completion, angular speed output valve be current gyro drift, angle output be current location angle value, gyroscope wireless transmission with
The time delays of angle transmission are ignored, after 408 buttons carry out moment of friction and abration position calculating in click Fig. 4, software
The moment of friction slided during stopping is calculated with 10Hz according to formula (3), while 1KHz angle value being sampled with 10Hz, and
In the file path that real-time 10Hz angle value and moment of friction value are stored into Fig. 4 to 404 settings, real-time rendering rotating mechanism is every
Moment of friction during week rotation is as shown in fig. 6, when software collection to rotational angular velocity is less than 1 °/s, to avoid revolving speed mistake
Friction torque test result error when low, software automatically exit from moment of friction acquisition mode, and by the moment of friction of storage and angle
For angle value array according to angle value size carry out sequence arrangement, drafting curve is as shown in Fig. 5, is looked for according to the distribution of circumferential moment of friction
The band of position to become larger to moment of friction, so that it is determined that state of wear and fretting wear position.
Software has the ability to vibration and noise progress spectrum analysis in rotating mechanism rotation process, software operation
Afterwards, it during rotating mechanism stable operation to be measured, clicks 406 in Fig. 4 after " beginning FFT " button, software is fast according to discrete signal
Fast Fourier transform (4) is converted, N default take 256 or other, can spectral characteristic under real-time monitoring current rotating speed.
Equipment and software initialization setting:
A. wireless gyroscope is installed on tested mechanism mounting surfaces by mechanical interface according to Fig. 1, and Circular gratings are installed
In in shaft；
B. the parameters such as software serial ports, server are received according to 401 to 403 setting gyroscopes in Fig. 4, Circular gratings UART is connect
Mouth is connected with 112 ground receiver computers in Fig. 1, clicks 404 the Browse buttons and data storage path is arranged；
C. it clicks " opening equipment " button 405 in Fig. 4 to start to acquire the angular speed and angle of rotating mechanism, software is according to peace
Angular speed of the matrix by acquisition angle rate conversion for current operation mechanism is filled, and passes through software correction circle on the basis of equipment zero-bit
Grating zero-bit.
The Stability Assessment of rotating mechanism realizes step:
A1: equipment is completed according to A~step C and software initialization is arranged；
B1: 409 setting stability count duration in figure 4,410 " stationarity statistics " buttons of click after setting up, and 409
Middle real-time display maximum angular rate Vmax, minimum angular speed Vmin, deviation peak-to-peak value Vp-p, it is aobvious after the completion of being counted by setting duration
Show 3 times of root-mean-square values of statistics.
Rotating mechanism moment of friction assesses implementation steps:
A2: with above-mentioned A, B, step C；
B2: by taking single axle table as an example, setting equipment under test revolving speed is by working speed art skating to stop state, setting figure
Rotating mechanism rotary inertia value in 4, clicks 408 " moment of friction calculating " buttons, and software is automatically performed calculating and result output.It crosses
Journey are as follows: software acquires equipment under test revolving speed in real time, and carries out once linear fitting according to tachometer value of the fixed frequency to acquisition, obtains
To a series of rotation angular acceleration values α=[α1,α2,…,αn]；Software exports 407 real-time moment values in Fig. 4, and exports Fig. 5.Know
When other rotating mechanism angular speed is less than 1 °/s, calculating is ended automatically, exports the statistics of 407 fit slopes and moment of friction in Fig. 4
And Fig. 6 as a result.When multi-axis turning mechanism tests, tested one by one according to three axis sequence.
Rotating mechanism vibration noise spectrum analysis implementation steps:
A3: with above-mentioned A, B, step C；
B3: it by taking single axle table as an example, after tested turntable turns to tested operating condition, clicks 406 in attached drawing 4 " beginning FFT " and presses
After button, software according to discrete Fast Fourier Transform iterative inversion formula real-time perfoming spectrum analysis, exports Fig. 7, facilitates carry out failure automatically
Prediction and fault location.
The present invention includes at least following the utility model has the advantages that (1) by the invention it is possible to determine rotating mechanism precisely in real time
Circumferential abration position, to reduce the risk because of equipment fault caused by excessive wear；(2) present invention uses non-contact measurement
And without applying external force, therefore it can exclude to influence the external action of accuracy；(3) present invention by angular speed and absolute angle come
It determines circumferential direction abration position, can achieve higher accuracy；(4) through the invention, rotating mechanism can also additionally be executed
Stability test and/or the test such as vibration noise spectrum analysis.
Although some embodiments of the present invention are described in present specification, to art technology
Personnel are it is readily apparent that these embodiments are merely possible to shown in example.It may occur to persons skilled in the art that numerous
Variant schemes, alternative solution and improvement project without beyond the scope of this invention.The appended claims are intended to limit this hair
Bright range, and cover the method and structure in the range of these claims itself and its equivalents whereby.
Claims (10)
1. a kind of for determining the device of the circumferential abration position of rotating mechanism, comprising:
Without angular velocity module, it is configured as the angular speed of measurement rotating mechanism and by measured angular speed with wireless parties
Formula is transferred to reception and post-processing module；
Angle acquisition and output module are configured as the absolute angle of measurement rotating mechanism and by measured absolute angle
It is transferred to reception and post-processing module；And
Reception and post-processing module, are configured as receiving measured angular speed and absolute angle and according to the angular speed
The circumferential abration position of rotating mechanism is calculated with absolute angle, wherein the calculating includes:
Angular velocity carries out linear fit to determine angular acceleration；
Measured absolute angle and identified angular acceleration are subjected to Data Matching alignment；
Moment of friction is determined according to the absolute angle of matching alignment and angular acceleration；
Stop the measurement of angular speed and absolute angle when angular speed is lower than threshold value；
Moment of friction and absolute angle array are ranked up according to the size of absolute angle；
Determine the regional location that moment of friction becomes larger；And
Circumferential abration position is determined according to the regional location.
2. the apparatus according to claim 1, wherein the wireless angular speed module includes:
Gyroscope is configured as the angular speed of measurement rotating mechanism；
Wireless forwarding module is configured as measured angular speed being sent wirelessly to reception and post-processing module；
Lithium battery is configured to supply power supply；
Secondary power supply module is configured as the voltage of lithium battery being converted into the operating voltage and wireless forwarding of gyroscope respectively
The operating voltage of module；And
Charging interface is configured as providing charging interface for lithium battery.
3. the apparatus according to claim 1, wherein angle acquisition includes: with output module
Circular gratings are arranged on rotating mechanism in order to provide Moire fringe；
Angular displacement measuring circuit is configured as calculating the absolute angle of rotating mechanism according to the Moire fringe of Circular gratings；And
Power supply module is configured as providing power supply for angular displacement measuring circuit.
4. the apparatus according to claim 1, wherein reception includes: with post-processing module
Ground receiver computer, be configured as according to received angular speed and absolute angle calculate the circumferential mill of rotating mechanism
Damage position.
5. the apparatus according to claim 1, wherein gyroscope passes through universal asynchronous receiving-transmitting transmitter UART protocol and wireless
Forwarding module communication；And/or
Angle acquisition is communicated by UART protocol with reception with post-processing module with output module.
6. the apparatus according to claim 1, wherein receive with post-processing module also its be configured as executing uniaxial or multiaxis
The stability test of rotating mechanism and/or vibration noise spectrum analysis.
7. the apparatus according to claim 1, wherein angle acquisition and output module include absolute optical code disc.
8. the apparatus according to claim 1, wherein angle acquisition and output module include increment photoelectric code disk and photoelectricity
Switch, wherein determining zero-bit by optoelectronic switch.
9. the apparatus according to claim 1, wherein angle acquisition and output module are configured as by by no line angle speed
Degree module output angular velocity is integrated to determine absolute angle.
10. a kind of method for determining the circumferential abration position of rotating mechanism, including the following steps:
The revolving speed of rotating mechanism is adjusted to working speed and closes the driving motor of rotating mechanism；
With the angular speed of the first frequency acquisition measurement rotating mechanism；
With the absolute angle of the first frequency acquisition measurement rotating mechanism；
Angular velocity carries out linear fit to determine angular acceleration；
Measured absolute angle and identified angular acceleration are subjected to Data Matching alignment；
Moment of friction is determined according to the absolute angle of matching alignment and angular acceleration；
Stop the measurement of angular speed and absolute angle when angular speed is lower than threshold value；
Moment of friction and absolute angle array are ranked up according to the size of absolute angle；
Determine the regional location that moment of friction becomes larger；And
Circumferential abration position is determined according to the regional location.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910352717.5A CN110030959B (en) | 2018-06-08 | 2018-06-08 | Device and method for determining the circumferential wear position of a rotating mechanism |
| CN201810584454.6A CN108791968B (en) | 2018-06-08 | 2018-06-08 | Apparatus and method for determining circumferential wear location of a rotating mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810584454.6A CN108791968B (en) | 2018-06-08 | 2018-06-08 | Apparatus and method for determining circumferential wear location of a rotating mechanism |
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| CN201910352717.5A Division CN110030959B (en) | 2018-06-08 | 2018-06-08 | Device and method for determining the circumferential wear position of a rotating mechanism |
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| CN108791968B true CN108791968B (en) | 2019-05-31 |
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| CN201810584454.6A Active CN108791968B (en) | 2018-06-08 | 2018-06-08 | Apparatus and method for determining circumferential wear location of a rotating mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113567116B (en) * | 2021-09-03 | 2025-01-07 | 东莞理工学院 | A kind of gear reduction motor gear wear detection device and detection method |
| CN115406632B (en) * | 2022-06-28 | 2023-04-21 | 陇东学院 | System and method for testing mechanical fatigue of robot |
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| CN105806613A (en) * | 2015-11-24 | 2016-07-27 | 国网内蒙古东部电力有限公司电力科学研究院 | Planetary gear case fault diagnosis method based on order complexity |
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| CN103245284A (en) * | 2013-05-14 | 2013-08-14 | 福州大学 | Gyroscope-chip-based steering wheel angle measurement method and device thereof |
| CN103759869A (en) * | 2014-01-17 | 2014-04-30 | 中国科学院西安光学精密机械研究所 | Device and method for measuring friction torque of rotating shaft of rotary table |
| CN205280004U (en) * | 2015-12-16 | 2016-06-01 | 贵州航天计量测试技术研究所 | Transmission shaft angle measurement device based on circle grating |
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- 2018-06-08 CN CN201910352717.5A patent/CN110030959B/en active Active
- 2018-06-08 CN CN201810584454.6A patent/CN108791968B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08170659A (en) * | 1994-12-15 | 1996-07-02 | Nissan Motor Co Ltd | Disc brake |
| CN103792155A (en) * | 2014-02-27 | 2014-05-14 | 河南理工大学 | Bit wear prediction method based on inertia measurement parameters |
| CN106272073A (en) * | 2015-05-27 | 2017-01-04 | 鞍钢股份有限公司 | Method for controlling roll head stop angle of hot rolling roll grinder |
| CN105806613A (en) * | 2015-11-24 | 2016-07-27 | 国网内蒙古东部电力有限公司电力科学研究院 | Planetary gear case fault diagnosis method based on order complexity |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110030959B (en) | 2020-12-25 |
| CN108791968A (en) | 2018-11-13 |
| CN110030959A (en) | 2019-07-19 |
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