CN114001815A - Amplitude measuring device and method, readable storage medium and vehicle - Google Patents
Amplitude measuring device and method, readable storage medium and vehicle Download PDFInfo
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Abstract
The invention provides an amplitude measuring device and method, a readable storage medium and a vehicle. The amplitude measuring device comprises a first displacement sensor, a second displacement sensor and a first acquisition module; the first displacement sensor acquires a first displacement signal of the output shaft in a first direction; the second displacement sensor acquires a second displacement signal of the output shaft in a second direction; the first acquisition module acquires the amplitude of the output shaft according to the first displacement signal and the second displacement signal; wherein, the included angle between the first displacement sensor and the second displacement sensor is a first angle. According to the technical scheme, the displacement of the output shaft of the power takeoff in the uncertain direction is decomposed into the first direction and the second direction, so that the measurement data of the amplitude is more accurate.
Description
Technical Field
The invention relates to the technical field of machinery, in particular to an amplitude measuring device and method, a readable storage medium and a vehicle.
Background
At present, various non-road vehicles have a hard working environment and poor road conditions, so that the working state of a Power Take Off (PTO) in the vehicle is poor, the vibration of a PTO output shaft is large, and if the amplitude of the PTO output shaft exceeds the bearing range of an oil seal, the oil leakage fault of the PTO oil seal can occur, so that the vehicle fault can be caused. Therefore, the amplitude of the PTO output shaft needs to be accurately measured, whether the amplitude exceeds the bearable range of the oil seal or not is judged, and the reliability test of the rack cannot simulate the vibration state of the whole vehicle, so that the reliability test cannot accurately judge the reliability of the PTO oil seal. Currently, there is no measurement method available to measure the amplitude of the PTO output shaft.
Disclosure of Invention
The present invention is directed to solving or improving at least one of the above technical problems.
To this end, a first object of the present invention is to provide an amplitude measuring device.
A second object of the present invention is to provide an amplitude measuring method.
A third object of the present invention is to provide a readable storage medium.
A fourth object of the present invention is to provide a vehicle.
In order to achieve the first object of the present invention, an aspect of the present invention provides an amplitude measuring apparatus for amplitude measurement of an output shaft of a power takeoff, the power takeoff including the output shaft, the amplitude measuring apparatus including: the device comprises a first displacement sensor, a second displacement sensor and a first acquisition module; the first displacement sensor acquires a first displacement signal of the output shaft in a first direction; the second displacement sensor acquires a second displacement signal of the output shaft in a second direction; the first acquisition module acquires the amplitude of the output shaft according to the first displacement signal and the second displacement signal; wherein, the included angle between the first displacement sensor and the second displacement sensor is a first angle.
In the technical scheme, the displacement in the uncertain direction can be decomposed into the first direction and the second direction, the actual amplitude of the output shaft is calculated by respectively measuring the displacements in the two directions and then superposing the displacements, so that the measurement data of the amplitude is more accurate, and the measurement error caused by the vibration of the uncertain direction of the revolving body can be reduced to the maximum extent.
In addition, the technical scheme provided by the invention can also have the following additional technical characteristics:
among the above-mentioned technical scheme, the power takeoff still includes the bell housing, and amplitude measuring device still includes: the support, the bracket connection flywheel shell for fixed first displacement sensor and second displacement sensor to make the contained angle between first displacement sensor and the second displacement sensor be first angle.
This technical scheme has guaranteed first displacement sensor and second displacement sensor's overall arrangement contained angle through a holistic support, through measuring the displacement of two directions respectively and superpose again, calculates the actual amplitude of output shaft for the measured data of amplitude is more accurate.
In any of the above technical solutions, the first obtaining module includes: the device comprises a voltage analog signal acquisition module, a data acquisition module and an amplitude acquisition module; the voltage analog signal acquisition module is used for converting the first displacement signal and the second displacement signal into a first voltage analog signal and a second voltage analog signal respectively; the data acquisition module is used for acquiring the first voltage analog signal and the second voltage analog signal and converting the first voltage analog signal and the second voltage analog signal into a first voltage digital signal and a second voltage digital signal; the amplitude acquisition module acquires a first displacement amount of the output shaft in a first direction according to the first voltage digital signal, acquires a second displacement amount of the output shaft in a second direction according to the second voltage digital signal, and acquires the amplitude of the output shaft based on the first displacement amount and the second displacement amount.
The first acquisition module of the technical scheme has the advantages of simple structure and low cost.
In any of the above technical solutions, the voltage analog signal obtaining module includes: the device comprises a first amplification module and a second amplification module; the first amplification module is used for processing the first displacement signal to obtain a first voltage analog signal; the second amplification module is used for processing the second displacement signal to obtain a second voltage analog signal.
Adopt two amplification modules among this technical scheme, when one of them amplification module breaks down, change easily.
In any of the above embodiments, the first angle comprises 90 °.
In the technical scheme, the first angle is set to be 90 degrees, so that accurate amplitude can be obtained when the amplitude of the output shaft is subsequently calculated, and the calculation is simple and convenient.
In any of the above solutions, the first displacement sensor includes an eddy current displacement sensor; and/or the second displacement sensor comprises an eddy current displacement sensor.
In the technical scheme, the displacement sensor for measuring the displacement of the curved surface can be faced by the eddy current displacement sensor, so that the measurement error caused by the vibration of the revolving body in the uncertain direction is reduced to the maximum extent.
In order to achieve the second object of the present invention, the technical solution of the present invention provides an amplitude measuring method for amplitude measurement of an output shaft of a power takeoff, the power takeoff including the output shaft, the amplitude measuring method including: acquiring a first displacement signal of an output shaft in a first direction; acquiring a second displacement signal of the output shaft in a second direction, wherein an included angle between the first direction and the second direction is a first angle; and acquiring the amplitude of the output shaft according to the first displacement signal and the second displacement signal.
In the technical scheme, the displacement of the output shaft of the power takeoff in the uncertain direction can be decomposed into the first direction and the second direction, the actual amplitude of the output shaft is calculated by respectively measuring the displacements in the two directions and then superposing the displacements, so that the measurement data of the amplitude is more accurate, and the measurement error caused by the vibration of the uncertain direction of the revolving body can be reduced to the maximum extent.
In addition, the technical scheme provided by the invention can also have the following additional technical characteristics:
among the above-mentioned technical scheme, according to first displacement signal and second displacement signal, acquire the amplitude of output shaft, specifically include: converting the first displacement signal and the second displacement signal into a first voltage analog signal and a second voltage analog signal respectively; collecting a first voltage analog signal and a second voltage analog signal, and converting the first voltage analog signal and the second voltage analog signal into a first voltage digital signal and a second voltage digital signal; and acquiring a first displacement amount of the output shaft in the first direction according to the first voltage digital signal, acquiring a second displacement amount of the output shaft in the second direction according to the second voltage digital signal, and acquiring the amplitude of the output shaft based on the first displacement amount and the second displacement amount.
The technical scheme has the advantages of simple method and low cost.
In any one of the above technical solutions, based on the first displacement and the second displacement, the amplitude of the output shaft is obtained, which specifically includes:
wherein h represents the amplitude of the output shaft, S1Denotes a first displacement quantity, S2Indicating the second amount of displacement and theta the first angle.
In the technical scheme, after the first displacement signal and the second displacement signal are converted into the first displacement amount and the second displacement amount, the actual rotation amplitude of the output shaft can be obtained through the formula.
In any of the above embodiments, the first angle comprises 90 °.
In the technical scheme, the included angle between the first direction and the second direction is 90 degrees, the first angle is set to be 90 degrees, accurate amplitude can be obtained when the amplitude of the output shaft is subsequently calculated, and the calculation is simple and convenient.
To achieve the third object of the present invention, the technical solution of the present invention provides a readable storage medium, which stores a program or instructions, and when the program or instructions are executed, the steps of the amplitude measurement method according to any one of the above technical solutions are implemented.
The readable storage medium provided in this technical solution implements the steps of the amplitude measurement method according to any one of the technical solutions of the present invention, and thus has all the beneficial effects of the amplitude measurement method according to any one of the technical solutions of the present invention, and details thereof are not described herein again.
To achieve the fourth object of the present invention, the technical solution of the present invention provides a vehicle including: an amplitude measuring device according to any one of the aspects of the present invention; and/or a readable storage medium according to any aspect of the present invention.
The vehicle provided by the technical scheme of the present invention includes the amplitude measuring device according to any technical scheme of the present invention and/or the readable storage medium according to any technical scheme of the present invention, so that the vehicle has all the advantages of the amplitude measuring device according to any technical scheme of the present invention and/or the readable storage medium according to any technical scheme of the present invention, and details are not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of an amplitude measurement apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram of a first acquisition module according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of an amplitude measuring device according to an embodiment of the present invention;
FIG. 4 is a second schematic structural diagram of an amplitude measuring device according to an embodiment of the present invention;
FIG. 5 is a third schematic structural diagram of an amplitude measuring device according to an embodiment of the present invention;
FIG. 6 is a flow chart of an amplitude measurement method according to an embodiment of the present invention;
FIG. 7 is a second flowchart of an amplitude measurement method according to an embodiment of the invention;
FIG. 8 is a third flowchart of an amplitude measurement method according to an embodiment of the invention;
FIG. 9 is a second schematic diagram of an amplitude measurement apparatus according to an embodiment of the present invention;
fig. 10 is a third schematic view of an amplitude measuring apparatus according to an embodiment of the invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 10 is:
100: amplitude measuring device, 110: first displacement sensor, 112: first lock nut, 120: second displacement sensor, 122: second lock nut, 130: first acquisition module, 140: a bracket, 142: first fixed seat, 144: second fixing seat, 146: first bolt, 148: second bolt, 150: voltage analog signal acquisition module, 152: first amplification module, 154: second amplification module, 156: first wire, 158: second connecting line, 160: data acquisition module, 162: third connecting line, 164: fourth connecting line, 166: data line, 170: amplitude acquisition module, 180: computer, 200: power takeoff, 210: output shaft, 220: flywheel housing, 230: oil seal, 300: amplitude measuring device, 310: first acquisition module, 320: second acquisition module, 330: amplitude acquisition module, 400: amplitude measuring device, 410: memory, 420: a processor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Amplitude measurement devices and methods, readable storage media, and vehicles according to some embodiments of the invention are described below with reference to fig. 1 to 10.
In the PTO, too large vibration of the PTO output shaft can affect the PTO oil seal, and when the PTO output shaft vibrates greatly and exceeds the bearing range of the PTO oil seal, the oil leakage fault of the PTO oil seal can be caused, so that the amplitude of the PTO output shaft is accurately measured, whether the amplitude exceeds the bearing range of the oil seal is judged, and the key for solving the oil leakage fault of the PTO oil seal is achieved.
In the PTO oil seal oil leakage solution of the related technology, after an oil seal structure is optimized, a bench PTO reliability test is carried out, because the amplitude of the PTO is not visually evaluated, whether the oil seal structure meets the condition that the vibration of the PTO cannot be evaluated or not is judged, and the vibration of the bench reliability test is small and is not the actual working state of the whole vehicle, the applicability of the optimization solution cannot be accurately evaluated. And moreover, the bench reliability test period is long, the test cost is high, and the improved scheme verification period is too long. And thirdly, the root cause of the holding problem is not found, and oil seal optimization and PTO vibration reduction are simultaneously carried out to solve the oil leakage problem of the oil seal.
Currently, engine PTO amplitude measurement presents several difficulties:
(1) because the engine PTO is a rotating part when in work, the measurement cannot be carried out through an acceleration sensor;
(2) the PTO is a rotating part, the surface is a curved surface, and when the PTO is measured by using a laser displacement sensor, if the PTO does not vibrate along the measuring direction, a large measuring error exists;
(3) in the rotation process of the PTO, the vibration is not in the direction movement, and the one-way measurement result is inaccurate;
(4) the reliability test of the bench cannot simulate the vibration state of the whole vehicle, so the reliability test cannot accurately judge the reliability of the PTO oil seal.
In summary, the present embodiment aims to solve at least one of the above problems.
Example 1:
as shown in fig. 1 and 4, the present embodiment provides an amplitude measuring apparatus 100 for measuring the amplitude of an output shaft 210 of a power takeoff 200, the power takeoff 200 including the output shaft 210, the amplitude measuring apparatus 100 including: a first displacement sensor 110, a second displacement sensor 120, and a first acquisition module 130.
The first displacement sensor 110 acquires a first displacement signal of the output shaft 210 in a first direction; the second displacement sensor 120 acquires a second displacement signal of the output shaft 210 in a second direction; the first obtaining module 130 obtains the amplitude of the output shaft 210 according to the first displacement signal and the second displacement signal; the included angle between the first displacement sensor 110 and the second displacement sensor 120 is a first angle.
In the related art, the basic principle of laser displacement sensor measurement is that a beam of laser is applied to a measured surface, and the laser return time is measured to measure the displacement, but because the PTO is a revolution curved surface, the laser measurement is a point-to-curved surface, and the analysis is performed in a limit state, when the PTO is displaced in the direction perpendicular to the laser beam, the relative displacement of the laser measurement point on the curved surface is caused due to the influence of the curved surface, and the displacement causes a displacement of a laser measuring head and a measured piece in the measurement direction, which causes a large measurement error, so the laser measurement method is not available, the first displacement sensor 110 and the second displacement sensor 120 cannot adopt laser displacement sensors, and the laser displacement sensors are point-to-curved surface measurements, and the amplitude in an uncertain direction has a large error.
In this embodiment, the first displacement sensor 110 and the second displacement sensor 120 are displacement sensors that can measure displacement of a curved surface, and the measurement error caused by the vibration of the revolving body in an uncertain direction is minimized. In the process of vibrating the PTO output shaft 210, in a limit state, when the PTO output shaft 210 has displacement perpendicular to the first displacement sensor 110 and the second displacement sensor 120, the highest point of the PTO output shaft 210 is still within the measuring head measuring range of the first displacement sensor 110 and the second displacement sensor 120, and the measuring error can be greatly reduced.
Because the vibration direction of the PTO output shaft 210 is uncertain, the unidirectional measurement cannot correctly reflect the actual vibration state and amplitude, in this embodiment, the displacement in the uncertain direction can be decomposed into a first direction and a second direction, and the actual amplitude of the PTO output shaft 210 is calculated by respectively measuring the displacements in the two directions and then superposing the two directions, so that the measurement data of the amplitude is more accurate, and the measurement error caused by the vibration of the revolving body in the uncertain direction can be reduced to the maximum extent.
In this embodiment, the amplitude of the PTO output shaft 210 is measured by the amplitude measuring device 100, and the amplitude of the PTO output shaft 210 can be evaluated whether to meet the requirements of the PTO oil seal by obtaining the accurate amplitude through measurement. The preparation and measurement time of the single trolley is about 4 hours, various schemes can be verified in a short time, the test cost is saved, the test efficiency is improved, and the improved scheme meeting the requirements can be verified as soon as possible.
Example 2:
as shown in fig. 3 and 4, the present embodiment provides an amplitude measuring apparatus 100, and in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
the power takeoff 200 further comprises a flywheel housing 220, and the amplitude measuring device 100 further comprises: the bracket 140, the bracket 140 is connected to the flywheel housing 220 for fixing the first displacement sensor 110 and the second displacement sensor 120, so that the included angle between the first displacement sensor 110 and the second displacement sensor 120 is a first angle.
In this embodiment, the bracket 140 may be a partial arc and is located outside the output shaft 210, the bracket 140 may be fixedly connected to the flywheel housing 220 through a bolt, two fixing seats are provided on the bracket 140, which are a first fixing seat 142 and a second fixing seat 144, respectively, the first displacement sensor 110 is fixed in the first fixing seat 142, the second displacement sensor 120 is fixed in the second fixing seat 144, a measuring head of the first displacement sensor 110 faces a first direction end face of the PTO output shaft 210, and a measuring head of the second displacement sensor 120 faces a second direction end face of the PTO output shaft 210. In this embodiment, an overall bracket 140 ensures a layout included angle between the first displacement sensor 110 and the second displacement sensor 120, and the actual amplitude of the PTO output shaft 210 is calculated by measuring displacements in two directions respectively and then superposing the displacements, so that the measurement data of the amplitude is more accurate, and the measurement error caused by the vibration of the revolving body in the uncertain direction can be reduced to the maximum extent.
Example 3:
as shown in fig. 2 and 5, the present embodiment provides an amplitude measuring apparatus 100, and in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
the first obtaining module 130 includes: a voltage analog signal acquisition module 150, a data acquisition module 160, and an amplitude acquisition module 170.
The voltage analog signal obtaining module 150 is configured to convert the first displacement signal and the second displacement signal into a first voltage analog signal and a second voltage analog signal, respectively; the data acquisition module 160 is configured to acquire the first voltage analog signal and the second voltage analog signal, and convert the first voltage analog signal and the second voltage analog signal into a first voltage digital signal and a second voltage digital signal; the amplitude obtaining module 170 obtains a first displacement amount of the output shaft 210 in the first direction according to the first voltage digital signal, obtains a second displacement amount of the output shaft 210 in the second direction according to the second voltage digital signal, and obtains the amplitude of the output shaft 210 based on the first displacement amount and the second displacement amount.
In this embodiment, when the PTO output shaft 210 has an amplitude, the first displacement sensor 110 obtains a first displacement signal of the output shaft 210 in a first direction, the second displacement sensor 120 obtains a second displacement signal of the output shaft 210 in a second direction, and the amplitude of the output shaft 210 cannot be directly obtained through the first displacement signal and the second displacement signal, so the voltage analog signal obtaining module 150 is used to convert the first displacement signal and the second displacement signal into a first voltage analog signal and a second voltage analog signal, and then the data acquisition module 160 is used to perform high-frequency acquisition on the first voltage analog signal and the second voltage analog signal to obtain a first voltage digital signal and a second voltage digital signal, and the amplitude obtaining module 170 may use data acquisition software to perform data sorting, and data sorting on the obtained first voltage digital signal and the obtained second voltage digital signal through the data acquisition software, And storing and analyzing to obtain the first displacement amount and the second displacement amount, and finally obtaining the amplitude of the output shaft 210.
The first obtaining module 130 of the embodiment has a simple structure and a low cost. By arranging the voltage analog signal acquisition module 150, the data acquisition module 160 and the amplitude acquisition module 170, the signals acquired by the first displacement sensor 110 and the second displacement sensor 120 are converted to obtain a first displacement and a second displacement, so that the amplitude of the output shaft 210 can be obtained.
Example 4:
as shown in fig. 5, the present embodiment provides an amplitude measuring apparatus 100, and in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
the voltage analog signal acquisition module 150 includes: a first amplification block 152 and a second amplification block 154; the first amplifying module 152 is configured to process the first displacement signal to obtain a first voltage analog signal; the second amplifying module 154 is configured to process the second displacement signal to obtain a second voltage analog signal.
In this embodiment, two amplification modules, namely, a first amplification module 152 and a second amplification module 154 are provided, and the signals output by the first displacement sensor 110 and the second displacement sensor 120 are processed by the first amplification module 152 and the second amplification module 154, respectively.
In the embodiment, two amplification modules are adopted, and when one amplification module fails, the two amplification modules are easy to replace.
Example 5:
the present embodiment provides an amplitude measuring apparatus 100, and in addition to the technical features of the above embodiments, the present embodiment further includes the following technical features:
the first angle comprises 90 °.
In this embodiment, the included angle between the first displacement sensor 110 and the second displacement sensor 120 is 90 °, and the included angle between the first displacement sensor 110 and the second displacement sensor 120 is fixed at 90 ° by the first fixing seat 142 and the second fixing seat 144 on the bracket 140.
In this embodiment, the first angle is set to 90 °, so that when the amplitude of the output shaft 210 is subsequently calculated, an accurate amplitude can be obtained, and the calculation is simple and convenient.
Example 6:
the present embodiment provides an amplitude measuring apparatus 100, and in addition to the technical features of the above embodiments, the present embodiment further includes the following technical features:
the first displacement sensor 110 comprises an eddy current displacement sensor; and/or the second displacement sensor 120 comprises an eddy current displacement sensor.
In this embodiment, the first displacement sensor 110 and the second displacement sensor 120 may employ an eddy current displacement sensor at the same time, or one of them may employ an eddy current displacement sensor.
In the embodiment, an eddy current displacement sensor is selected for measurement, and the measurement principle of the eddy current displacement sensor is that the change of the distance between a measured piece and the sensor causes the change of eddy current inside the eddy current displacement sensor, otherwise, the change of the distance can be pushed out through the change of the eddy current, so that the displacement of the measured piece is obtained. Because the bottom surface of the eddy current displacement sensor is a plane, the diameter is about 10mm, and the maximum damage displacement of the PTO oil seal is about 0.15mm, in the limit state, when the measured piece generates the displacement vertical to the eddy current displacement sensor, the highest point is still in the measuring range of the measuring head of the eddy current displacement sensor, and the measuring error is greatly reduced.
For example, when the first displacement sensor 110 and the second displacement sensor 120 both adopt eddy current displacement sensors, when the distances between the PTO output shaft 210 and the first displacement sensor 110 and the second displacement sensor 120 change, the eddy currents in the first displacement sensor 110 and the second displacement sensor 120 change to generate a first displacement signal and a second displacement signal, the first displacement signal and the second displacement signal are eddy current signals, the eddy current signals are respectively transmitted to the first amplification module 152 and the second amplification module 154 through the connection lines, the first amplification module 152 and the second amplification module 154 are adjusted by a circuit to output a first voltage analog signal and a second voltage analog signal, the first voltage analog signal and the second voltage analog signal are transmitted to the data acquisition module 160 through the connection lines to perform high-frequency acquisition, and the first voltage analog signal and the second voltage analog signal are converted into a first voltage digital signal and a second voltage digital signal, the amplitude is transmitted to the amplitude obtaining module 170 through a data line, the amplitude obtaining module 170 performs data sorting, storage and analysis, and obtains a first displacement and a second displacement, thereby obtaining the amplitude of the output shaft 210.
In the embodiment, the displacement sensor which can perform displacement measurement on the curved surface by adopting the eddy current displacement sensor can reduce the measurement error caused by the vibration of the revolving body in the uncertain direction to the maximum extent.
Example 7:
as shown in fig. 6, the present embodiment provides an amplitude measuring method for amplitude measurement of an output shaft of a power takeoff including the output shaft, the amplitude measuring method including the steps of:
step S102, acquiring a first displacement signal of an output shaft in a first direction;
step S104, acquiring a second displacement signal of the output shaft in a second direction, wherein an included angle between the first direction and the second direction is a first angle;
and step S106, acquiring the amplitude of the output shaft according to the first displacement signal and the second displacement signal.
Because the vibration direction of the PTO output shaft 210 is uncertain, the unidirectional measurement cannot correctly reflect the actual vibration state and amplitude, in this embodiment, the displacement in the uncertain direction can be decomposed into a first direction and a second direction, and the actual amplitude of the PTO output shaft 210 is calculated by respectively measuring the displacements in the two directions and then superposing the two directions, so that the measurement data of the amplitude is more accurate, and the measurement error caused by the vibration of the revolving body in the uncertain direction can be reduced to the maximum extent.
In this embodiment, the amplitude of the PTO output shaft 210 is measured, and it can be evaluated whether the PTO amplitude meets the requirements of the PTO oil seal by obtaining the accurate amplitude through measurement. The preparation and measurement time of the single trolley is about 4 hours, various schemes can be verified in a short time, the test cost is saved, the test efficiency is improved, and the improved scheme meeting the requirements can be verified as soon as possible.
Example 8:
as shown in fig. 7, the present embodiment provides an amplitude measuring method, and in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
the method for acquiring the amplitude of the output shaft according to the first displacement signal and the second displacement signal specifically comprises the following steps:
step S202, converting the first displacement signal and the second displacement signal into a first voltage analog signal and a second voltage analog signal respectively;
step S204, collecting the first voltage analog signal and the second voltage analog signal, and converting the first voltage analog signal and the second voltage analog signal into a first voltage digital signal and a second voltage digital signal;
step S206, a first displacement amount of the output shaft in the first direction is obtained according to the first voltage digital signal, a second displacement amount of the output shaft in the second direction is obtained according to the second voltage digital signal, and the amplitude of the output shaft is obtained based on the first displacement amount and the second displacement amount.
In this embodiment, when the PTO output shaft 210 has an amplitude, a first displacement signal of the output shaft 210 in the first direction is obtained, a second displacement signal of the output shaft 210 in the second direction is obtained, and the amplitude of the output shaft 210 cannot be directly obtained through the first displacement signal and the second displacement signal, so that the first displacement signal and the second displacement signal are respectively converted into a first voltage analog signal and a second voltage analog signal, and then the first voltage analog signal and the second voltage analog signal are subjected to high-frequency acquisition to obtain a first voltage digital signal and a second voltage digital signal, and data sorting, storage and analysis may be performed on the obtained first voltage digital signal and the obtained second voltage digital signal by using data acquisition software to obtain a first displacement amount and a second displacement amount, and finally obtain the amplitude of the output shaft 210.
The method is simple and low in cost.
Example 9:
as shown in fig. 8, the present embodiment provides an amplitude measuring method, and in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
based on first displacement volume and second displacement volume, acquire the amplitude of output shaft, specifically include:
wherein h represents the amplitude of the output shaft, S1Denotes a first displacement quantity, S2Indicating the second amount of displacement and theta the first angle.
In this embodiment, after the first displacement signal and the second displacement signal are converted into the first displacement amount and the second displacement amount, the actual rotation amplitude of the PTO output shaft can be obtained by the above formula.
Example 10:
the present embodiment provides an amplitude measurement method, and in addition to the technical features of the above embodiments, the present embodiment further includes the following technical features:
the first angle comprises 90 °.
In this embodiment, the included angle between the first direction and the second direction is 90 °, and by setting the first angle to 90 °, when the amplitude of the output shaft 210 is subsequently calculated, an accurate amplitude can be obtained, and the calculation is simple and convenient.
As shown in fig. 8, when the first angle is 90 °, the amplitude of the output shaft is obtained based on the first displacement amount and the second displacement amount, and the method specifically includes the following steps:
step S302, acquiring the sum of the square of the first displacement and the square of the second displacement;
in step S304, the square root of the sum of the square of the first displacement and the square of the second displacement is obtained, and the square root is the amplitude of the output shaft.
In this embodiment, after the first displacement signal and the second displacement signal are converted into the first displacement amount and the second displacement amount, the square of the first displacement amount and the square of the second displacement amount are added by the root sign to obtain the actual rotation amplitude of the PTO output shaft.
When the first angle is 90 degrees, the amplitude of the output shaft is obtained by adding the square of the first displacement and the square of the second displacement, the measurement data of the amplitude can be more accurate, and the measurement error caused by the vibration of the revolving body in the uncertain direction can be reduced to the maximum extent.
Example 11:
as shown in fig. 9, the present embodiment provides an amplitude measuring apparatus 300 including: a first acquisition module 310, a second acquisition module 320, and an amplitude acquisition module 330; the first obtaining module 310 is configured to collect a first displacement signal of the output shaft in a first direction; the second acquiring module 320 is configured to acquire a second displacement signal of the output shaft in a second direction; the amplitude obtaining module 330 is configured to obtain an amplitude of the output shaft according to the first displacement signal and the second displacement signal; wherein, the included angle between the first direction and the second direction is a first angle.
This embodiment decomposes the displacement in the uncertain direction into a first direction and a second direction by: the first obtaining module 310 and the second obtaining module 320 respectively obtain displacements in two directions and then superpose the displacements, and the amplitude obtaining module 330 calculates the actual amplitude of the PTO output shaft 210, so that the measurement data of the amplitude is more accurate, and the measurement error caused by the vibration of the revolving body in the uncertain direction can be reduced to the maximum extent.
In this embodiment, the amplitude of the PTO output shaft 210 is measured, and it can be evaluated whether the PTO amplitude meets the requirements of the PTO oil seal by obtaining the accurate amplitude through measurement. The preparation and measurement time of the single trolley is about 4 hours, various schemes can be verified in a short time, the test cost is saved, the test efficiency is improved, and the improved scheme meeting the requirements can be verified as soon as possible.
Example 12:
as shown in fig. 10, the present embodiment provides an amplitude measuring apparatus 400 including: a memory 410 and a processor 420, the memory 410 storing programs or instructions, the processor 420 executing the programs or instructions; wherein the processor 420, when executing the program or instructions, performs the steps of the amplitude measurement method according to any of the embodiments of the present invention.
Example 13:
the present embodiment provides a readable storage medium, which stores a program or instructions, and when the program or instructions are executed by a processor, the steps of the amplitude measurement method of any one of the above embodiments are implemented.
Example 14:
the present embodiment provides a power takeoff, including: an amplitude measuring device according to any of the embodiments of the present invention; and/or readable storage media as embodiments of the invention.
Example 15:
the embodiment provides a vehicle, including: an amplitude measuring device according to any of the embodiments of the present invention; and/or readable storage media as embodiments of the invention.
The specific embodiment is as follows:
as shown in fig. 1, 2 and 5, the present embodiment provides an amplitude measuring device 100, which includes a bracket 140, a first displacement sensor 110, a second displacement sensor 120, a first amplification module 152, a second amplification module 154, a data acquisition module 160 and an amplitude acquisition module 170.
The first displacement sensor 110 and the second displacement sensor 120 are eddy current displacement sensors.
As shown in fig. 3 and 4, the bracket 140 is fixedly mounted on the flywheel housing 220 by a first bolt 146 and a second bolt 148, the first displacement sensor 110 is fixed on the first fixing base 142 by a first lock nut 112 through a threaded connection, the second displacement sensor 120 is fixed on the second fixing base 144 by a second lock nut 122 through a threaded connection, a measuring head of the first displacement sensor 110 is opposite to an X-direction end face of the PTO output shaft 210, a measuring head of the second displacement sensor 120 is opposite to a Y-direction end face of the PTO output shaft 210, and an angle between the X direction and the Y direction is 90 degrees.
As shown in fig. 5, the first displacement sensor 110 is connected to the first amplification module 152 through a first connection 156, the second displacement sensor 120 is connected to the second amplification module 154 through a second connection 158, the first amplification module 152 is connected to the data acquisition module 160 through a third connection 162, the second amplification module 154 is connected to the data acquisition module 160 through a fourth connection 164, the data acquisition module 160 is connected to the computer 180 through a data line 166, and the amplitude acquisition module 170 is implemented by software in the computer 180.
The working principle is as follows:
when the PTO works normally, the PTO is always in a vibration state due to the fluctuation of the engine speed and the working environment of the vehicle, when the amplitude of the PTO output shaft 210 exceeds the bearable limit of the PTO oil seal 230, the problem of sealing failure of the PTO oil seal 230 is inevitably caused, so that the sealing of the PTO oil seal 230 is not tight, the PTO oil leaks, and the PTO is positioned above the flywheel housing 220 of the engine, so that the use experience of a user is influenced. Therefore, the ability to accurately measure the amplitude of the PTO output shaft 210 becomes a key to solving the problem of PTO oil leakage.
As shown in fig. 5, in the amplitude measuring apparatus 100 of the present embodiment, the first displacement sensor 110 and the second displacement sensor 120 are both facing the PTO output shaft 210 of the object to be measured, and the angle between the first displacement sensor 110 and the second displacement sensor 120 is 90 degrees, when the PTO output shaft 210 has amplitude, the distance between the PTO output shaft 210 of the object to be measured and the first displacement sensor 110 and the second displacement sensor 120 changes, so that the eddy current inside the first displacement sensor 110 and the second displacement sensor 120 changes, and a first displacement signal and a second displacement signal are obtained, both the first displacement signal and the second displacement signal are eddy current signals, the first displacement signal and the second displacement signal are transmitted to the first amplifying module 152 and the second amplifying module 154 through the first connecting line 156 and the second connecting line 158, the inside of the first amplifying module 152 and the second amplifying module 154 is adjusted through a circuit, and a voltage analog signal is output, the first voltage analog signal and the second voltage analog signal are transmitted to the data acquisition module 160 through the third connection line 162 and the fourth connection line 164 to perform high-frequency acquisition, and the first voltage analog signal and the second voltage analog signal are converted into a first voltage digital signal and a second voltage digital signal, which are transmitted to the computer 180 through the data line 166, the amplitude acquisition module 170 is arranged in the computer 180, and the amplitude acquisition module 170 acquires a first displacement amount and a second displacement amount based on the first voltage digital signal and the second voltage digital signal according to the first voltage digital signal and the second voltage digital signal, so as to acquire the amplitude of the output shaft 210. The amplitude acquisition module 170 may employ dedicated data acquisition software to perform data sorting, storage, and analysis.
In this embodiment, the amplitude of the output shaft 210 is: after the signals from the first displacement sensor 110 and the second displacement sensor 120 are converted into the first displacement amount and the second displacement amount, the square phase of the first displacement amount and the square phase of the second displacement amount are added to the root sign, and the actual rotation amplitude of the PTO output shaft 210 can be obtained.
In the embodiment, the displacement in the uncertain direction is decomposed into the first direction and the second direction, and the displacements in the two directions are respectively measured and then superposed, so that the measurement error caused by the vibration of the revolving body in the uncertain direction can be reduced to the maximum extent.
In the embodiment, the accurate amplitude can be obtained by formula calculation through two eddy current displacement sensors which form an included angle of 90 degrees with each other.
In the embodiment, whether the amplitude of the PTO meets the requirement of the PTO oil seal or not can be evaluated by measuring the accurate amplitude.
The test of the embodiment is simple and quick, the amplitude of different schemes can be quickly measured, and whether the different design schemes meet the requirements or not is evaluated.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An amplitude measuring device (100) for amplitude measurement of an output shaft (210) of a power take-off (200), said power take-off (200) comprising said output shaft (210), characterized in that said amplitude measuring device (100) comprises:
a first displacement sensor (110), the first displacement sensor (110) acquiring a first displacement signal of the output shaft (210) in a first direction;
a second displacement sensor (120), the second displacement sensor (120) acquiring a second displacement signal of the output shaft (210) in a second direction;
a first acquisition module (130), wherein the first acquisition module (130) acquires the amplitude of the output shaft (210) according to the first displacement signal and the second displacement signal;
wherein an included angle between the first displacement sensor (110) and the second displacement sensor (120) is a first angle.
2. The amplitude measurement device (100) of claim 1, the power take-off (200) further comprising a flywheel housing (220), wherein the amplitude measurement device (100) further comprises:
the bracket (140) is connected with the flywheel housing (220) and used for fixing the first displacement sensor (110) and the second displacement sensor (120) so that the included angle between the first displacement sensor (110) and the second displacement sensor (120) is a first angle.
3. The amplitude measurement device (100) according to claim 1, wherein the first acquisition module (130) comprises:
a voltage analog signal acquisition module (150), wherein the voltage analog signal acquisition module (150) is configured to convert the first displacement signal and the second displacement signal into a first voltage analog signal and a second voltage analog signal, respectively;
a data acquisition module (160), wherein the data acquisition module (160) is configured to acquire the first voltage analog signal and the second voltage analog signal, and convert the first voltage analog signal and the second voltage analog signal into a first voltage digital signal and a second voltage digital signal;
an amplitude acquisition module (170), wherein the amplitude acquisition module (170) acquires a first displacement amount of the output shaft (210) in the first direction according to the first voltage digital signal, acquires a second displacement amount of the output shaft (210) in the second direction according to the second voltage digital signal, and acquires the amplitude of the output shaft (210) based on the first displacement amount and the second displacement amount.
4. The amplitude measurement device (100) according to claim 3, wherein the voltage analog signal acquisition module (150) comprises:
the first amplification module (152), the first amplification module (152) is configured to process the first displacement signal to obtain the first voltage analog signal;
and the second amplification module (154), the second amplification module (154) is configured to process the second displacement signal to obtain the second voltage analog signal.
5. The amplitude measurement device (100) according to claim 1, wherein the first angle comprises 90 °.
6. The amplitude measurement device (100) according to any one of claims 1 to 5, wherein the first displacement sensor (110) comprises an eddy current displacement sensor; and/or the second displacement sensor (120) comprises an eddy current displacement sensor.
7. An amplitude measuring method for amplitude measurement of an output shaft of a power takeoff including the output shaft, characterized by comprising:
acquiring a first displacement signal of the output shaft in a first direction;
acquiring a second displacement signal of the output shaft in a second direction, wherein an included angle between the first direction and the second direction is a first angle;
and acquiring the amplitude of the output shaft according to the first displacement signal and the second displacement signal.
8. The amplitude measurement method according to claim 7, wherein obtaining the amplitude of the output shaft from the first displacement signal and the second displacement signal specifically includes:
converting the first displacement signal and the second displacement signal into a first voltage analog signal and a second voltage analog signal respectively;
collecting the first voltage analog signal and the second voltage analog signal, and converting the first voltage analog signal and the second voltage analog signal into a first voltage digital signal and a second voltage digital signal;
and acquiring a first displacement amount of the output shaft in the first direction according to the first voltage digital signal, acquiring a second displacement amount of the output shaft in the second direction according to the second voltage digital signal, and acquiring the amplitude of the output shaft based on the first displacement amount and the second displacement amount.
9. The amplitude measurement method according to claim 8, wherein the obtaining the amplitude of the output shaft based on the first displacement amount and the second displacement amount specifically includes:
wherein h represents the amplitude of the output shaft, S1Representing said first displacement quantity, S2Represents the second displacement amount, and θ represents the first angle.
10. The amplitude measurement method according to any one of claims 7 to 9, wherein the first angle includes 90 °.
11. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, carry out the steps of the amplitude measurement method according to any one of claims 7 to 10.
12. A vehicle, characterized by comprising:
the amplitude measurement device of any one of claims 1 to 6; and/or
The readable storage medium of claim 11.
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Cited By (1)
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