CN111730410A - Static pressure and dynamic and static pressure main shaft oil film rigidity damping real-time measurement method and device, detection device, storage medium and system - Google Patents

Static pressure and dynamic and static pressure main shaft oil film rigidity damping real-time measurement method and device, detection device, storage medium and system Download PDF

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Publication number
CN111730410A
CN111730410A CN202010715277.8A CN202010715277A CN111730410A CN 111730410 A CN111730410 A CN 111730410A CN 202010715277 A CN202010715277 A CN 202010715277A CN 111730410 A CN111730410 A CN 111730410A
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oil film
axis
spindle
static pressure
main shaft
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田助新
李波
杨柳
向华
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Xiangyang Guangrui Auto Parts Co ltd
XY-HUST ADVANCED MANUFACTURING ENGINEERING RESEARCH INSTITUTE
Hubei University of Arts and Science
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Xiangyang Guangrui Auto Parts Co ltd
XY-HUST ADVANCED MANUFACTURING ENGINEERING RESEARCH INSTITUTE
Hubei University of Arts and Science
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/007—Arrangements for observing, indicating or measuring on machine tools for managing machine functions not concerning the tool

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Abstract

The invention belongs to the technical field of oil film rigidity damping measurement, and discloses a method, a device, a detection device, a storage medium and a system for measuring static pressure and dynamic and static pressure main shaft oil film rigidity damping in real time. The method comprises the following steps: obtaining the displacement of the axis of the spindle in the direction of the section of the spindle; calculating the speed of the axis of the main shaft and the force of a bearing oil film according to the displacement of the axis of the main shaft in the direction of the section of the main shaft; and calculating the rigidity coefficient and the damping coefficient of the main shaft oil film according to the speed, the displacement and the bearing oil film force. Through the mode, the spindle oil film stiffness damping can be calculated in real time by obtaining the displacement of the axis of the spindle in the direction of the section of the axis, namely obtaining the motion trail of the axis of the spindle, so that the spindle oil film stiffness damping can be measured in real time.

Description

Static pressure and dynamic and static pressure main shaft oil film rigidity damping real-time measurement method and device, detection device, storage medium and system
Technical Field
The invention relates to the technical field of oil film rigidity damping measurement, in particular to a method, a device, a detection device, a storage medium and a system for measuring static pressure and dynamic and static pressure spindle oil film rigidity damping in real time.
Background
The static pressure and static pressure main shaft is used as a key functional component of a high-precision machine tool, the precision of the main shaft directly determines the machining precision of the machine tool, and the precision of the main shaft directly depends on the rigidity damping of a supporting oil film. At present, the research on the oil film rigidity damping of static pressure and dynamic and static pressure main shafts is mainly theoretical, and a method for measuring the oil film rigidity damping of the main shaft in real time is not available.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a method, a device, a detection device, a storage medium and a system for measuring the oil film stiffness damping of a static pressure and dynamic and static pressure main shaft in real time, and aims to solve the technical problem that the oil film stiffness damping of the main shaft cannot be measured in real time in the prior art.
In order to achieve the aim, the invention provides a method for measuring the oil film stiffness damping of a static pressure and dynamic and static pressure main shaft in real time, which comprises the following steps:
obtaining the displacement of the axis of the spindle in the direction of the section of the spindle;
calculating the speed of the axis of the main shaft and the force of a bearing oil film according to the displacement of the axis of the main shaft in the direction of the section of the main shaft;
and calculating the rigidity coefficient and the damping coefficient of the main shaft oil film according to the speed, the displacement and the bearing oil film force.
Preferably, a coordinate system is established on the cross section of the main shaft, the position of the center of a circle when the centers of the main shaft and the bearing are overlapped is taken as the origin, and the stiffness coefficient and the damping coefficient of the oil film of the main shaft are calculated according to the following formula:
Figure BDA0002595279850000021
Figure BDA0002595279850000022
Figure BDA0002595279850000023
Figure BDA0002595279850000024
where t refers to a certain time, Δ t refers to a time interval, Kxx_tAnd Kxy_tRespectively refers to the rigidity coefficient C of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the x-axis direction at the time of txx_tAnd Cxy_tRespectively refers to the damping coefficient K of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the x-axis direction at the time of tyx_tAnd Kyy_tRespectively refers to the rigidity coefficient of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the y-axis direction at the time of t, Cyx_tAnd Cyy_tRespectively refers to the damping coefficient u of the displacement of the main shaft oil film in the x-axis direction and the y-axis direction under the stress in the y-axis direction at the time of ttAnd vtThe speed components of the spindle axis in the X-axis and Y-axis at time t, ut+ΔtAnd vt+ΔtThe speed components of the spindle axis in the X-axis and Y-axis at times t + Δ t, respectively, Δ Xt+ΔtAnd Δ yt+ΔtRefer to the displacements of the spindle axis in the X-axis and Y-axis, FX, relative to the origin at time t + Δ t, respectivelytAnd FYtComponent of bearing oil film force on X-axis and Y-axis at time t, FX, respectively, referring to the position of the shaft centert+ΔtAnd FYt+ΔtThe components of the bearing oil film force on the X axis and the Y axis at time t + Δ t of the axial center position, respectively.
Preferably, the speed of calculating the axis of the spindle according to the displacement of the axis of the spindle in the direction of the section of the spindle is calculated according to the following formula:
Figure BDA0002595279850000025
wherein, Δ xt-ΔtAnd Δ yt-ΔtRespectively, refer to the displacements on the X and Y axes at time t-at.
Preferably, the step of calculating the bearing oil film force of the spindle axis from the displacement of the spindle axis in the direction of the cross section thereof includes:
spreading the oil film into a plane, and meshing the oil film: n points in the z direction and m points in the theta direction;
calculating the oil film pressure at any grid point of the oil film according to the coordinate of the axis;
and multiplying the oil film pressure of each point by the area of a single grid, and then accumulating to obtain the bearing oil film force of the spindle axis.
Preferably, the step of calculating the oil film pressure at any grid point of the oil film according to the coordinate of the axis is calculated by the following formula:
Figure BDA0002595279850000031
wherein, represents a dimensionless quantity, hiIs the oil film thickness at any grid point (i, j), D is the bearing diameter, L is the bearing length, f (x, y) is the coordinate function of the spindle axis, pi,jIs the oil film pressure at any grid point (i, j).
In addition, in order to achieve the above object, the present invention further provides a static pressure and dynamic static pressure spindle oil film stiffness damping real-time measuring device, which comprises:
the acquisition module is used for acquiring the displacement of the axis of the spindle in the direction of the section of the spindle;
the calculation module is used for calculating the speed of the axis of the main shaft and the force of a bearing oil film according to the displacement of the axis of the main shaft in the direction of the section of the axis of the main shaft;
and the calculation module is also used for calculating the rigidity coefficient and the damping coefficient of the main shaft oil film according to the speed, the displacement and the bearing oil film force.
Preferably, the calculation module is further configured to:
spreading the oil film into a plane, and meshing the oil film: n points in the z direction and m points in the theta direction;
calculating the oil film pressure at any grid point of the oil film according to the coordinate of the axis;
and multiplying the oil film pressure of each point by the area of a single grid, and then accumulating to obtain the bearing oil film force of the spindle axis.
In addition, to achieve the above object, the present invention further provides a detection apparatus, including: the device comprises a memory, a processor, two displacement sensors and a static pressure and dynamic static pressure main shaft oil film rigidity damping real-time measurement program which is stored on the memory and can run on the processor, wherein the static pressure and dynamic static pressure main shaft oil film rigidity damping real-time measurement program is configured to realize the steps of the method for measuring the static pressure and dynamic static pressure main shaft oil film rigidity damping in real time.
In addition, in order to achieve the above object, the present invention further provides a storage medium, where a static pressure and static pressure spindle oil film stiffness damping real-time measurement program is stored on the storage medium, and the static pressure and static pressure spindle oil film stiffness damping real-time measurement program is executed by a processor to implement the steps of the static pressure and static pressure spindle oil film stiffness damping real-time measurement method.
In addition, in order to achieve the above object, the present invention further provides a system for measuring the oil film stiffness damping of a static pressure and static pressure spindle in real time, comprising:
a main shaft to be tested and a bearing;
detection device, detection device install in outside the main shaft that awaits measuring, and perpendicular to the diameter of axle direction of main shaft that awaits measuring, the device includes: the device comprises a memory, a processor, two displacement sensors and a static pressure and dynamic static pressure main shaft oil film rigidity damping real-time measurement program which is stored on the memory and can run on the processor, wherein the static pressure and dynamic static pressure main shaft oil film rigidity damping real-time measurement program is configured to realize the steps of the method for measuring the static pressure and dynamic static pressure main shaft oil film rigidity damping in real time.
According to the technical scheme, the spindle oil film stiffness damping can be calculated in real time by obtaining the displacement of the axis of the spindle in the direction of the section of the axis, namely obtaining the motion trail of the axis of the spindle, so that the spindle oil film stiffness damping can be measured in real time.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a real-time measurement method for oil film stiffness damping of a static pressure and static pressure main shaft according to a first embodiment of the invention;
FIG. 3 is a schematic flow chart of a real-time measurement method for oil film stiffness damping of a static pressure and static pressure spindle according to a second embodiment of the invention;
FIG. 4 is a schematic flow chart of a third embodiment of a method for measuring the oil film stiffness damping of a static pressure and static pressure spindle in real time according to the present invention;
FIG. 5 is a structural diagram of a real-time static pressure and static pressure spindle oil film stiffness damping measuring device according to a first embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a static pressure and static pressure main shaft oil film stiffness damping real-time measurement device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the electronic device may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the electronic device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a static pressure, dynamic static pressure, and static pressure spindle oil film stiffness damping real-time measurement program.
In the electronic apparatus shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the electronic device of the invention can be arranged in a static pressure and static pressure main shaft oil film stiffness damping real-time measuring device, the electronic device calls a static pressure and static pressure main shaft oil film stiffness damping real-time measuring program stored in the memory 1005 through the processor 1001, and executes the static pressure and static pressure main shaft oil film stiffness damping real-time measuring method provided by the embodiment of the invention.
The embodiment of the invention provides a static pressure and dynamic static pressure main shaft oil film rigidity damping real-time measurement method, and refers to fig. 2, wherein fig. 2 is a schematic flow diagram of a first embodiment of the static pressure and dynamic static pressure main shaft oil film rigidity damping real-time measurement method.
In this embodiment, the method for measuring the oil film stiffness damping of the static pressure and dynamic and static pressure main shaft in real time comprises the following steps:
step S10: obtaining the displacement of the axis of the spindle in the direction of the section of the spindle;
the displacement of the axis of the spindle in the direction of the section of the spindle can be obtained in various ways, the axis of the spindle can be marked, then the displacement of the axis of the spindle in the direction of the section of the spindle can be observed, two mutually perpendicular displacement sensors can be arranged outside the spindle in the direction perpendicular to the axial diameter of the spindle, and the displacement of the axis of the spindle in the direction of the section of the spindle can be obtained through the displacement sensors;
step S20: calculating the speed of the axis of the main shaft and the force of a bearing oil film according to the displacement of the axis of the main shaft in the direction of the section of the main shaft;
the speed of the spindle axis is calculated according to the displacement of the spindle axis in the direction of the section of the spindle axis, the average speed in a certain period of time can be obtained by dividing the displacement variation in the period of time by the time, and when the time is sufficiently small, the speed can be regarded as the instantaneous speed of the spindle axis. The axis of the spindle can be obtained by solving a Reynolds equation according to a numerical difference method.
Step S30: and calculating the rigidity coefficient and the damping coefficient of the main shaft oil film according to the speed, the displacement and the bearing oil film force.
When the speed of the shaft center of the main shaft and the displacement of the bearing oil film force in the direction of the section of the shaft center of the combined main shaft are obtained, the rigidity coefficient can be obtained by dividing the variation of the force by the variation of the speed, and the damping coefficient can be obtained by dividing the variation of the force by the variation of the displacement.
In the embodiment, the oil film stiffness damping of the spindle can be calculated in real time by acquiring the displacement of the axis of the spindle in the direction of the section of the axis, namely acquiring the motion track of the axis of the spindle, so that the oil film stiffness damping of the spindle can be measured in real time.
Referring to fig. 3, fig. 3 is a schematic flow chart of a static pressure and dynamic static pressure spindle oil film stiffness damping real-time measurement method according to a second embodiment of the present invention.
Based on the first embodiment, the method for measuring the oil film stiffness damping of the static pressure and static pressure main shaft in real time in this embodiment further includes, before the step S10:
step S09 is to establish a coordinate system on the cross section of the spindle, and use the center position when the centers of the spindle and the bearing overlap as the origin, and accordingly, the stiffness coefficient and the damping coefficient of the spindle oil film in step S30 are calculated according to the following formula:
Figure BDA0002595279850000071
Figure BDA0002595279850000072
Figure BDA0002595279850000073
Figure BDA0002595279850000074
where t refers to a certain time, Δ t refers to a time interval, Kxx_tAnd Kxy_tRespectively refers to the rigidity coefficient C of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the x-axis direction at the time of txx_tAnd Cxy_tRespectively refers to the damping coefficient K of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the x-axis direction at the time of tyx_tAnd Kyy_tRespectively refers to the rigidity coefficient of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the y-axis direction at the time of t, Cyx_tAnd Cyy_tRespectively refers to the damping coefficient u of the displacement of the main shaft oil film in the x-axis direction and the y-axis direction under the stress in the y-axis direction at the time of ttAnd vtThe speed components of the spindle axis in the X-axis and Y-axis at time t, ut+ΔtAnd vt+ΔtThe speed components of the spindle axis in the X-axis and Y-axis at times t + Δ t, respectively, Δ Xt+ΔtAnd Δ yt+ΔtRefer to the displacements of the spindle axis in the X-axis and Y-axis, FX, relative to the origin at time t + Δ t, respectivelytAnd FYtComponent of bearing oil film force on X-axis and Y-axis at time t, FX, respectively, referring to the position of the shaft centert+ΔtAnd FYt+ΔtThe components of the bearing oil film force on the X axis and the Y axis at time t + Δ t of the axial center position, respectively.
In this embodiment, the stiffness coefficient and the damping coefficient of the spindle oil film can be accurately calculated according to the speed, the displacement, and the bearing oil film force by using a formula, and when the time interval is sufficiently small, the stiffness coefficient and the damping coefficient can be regarded as the real-time stiffness coefficient and the damping coefficient of the spindle oil film at the moment.
U in the above formulatAnd vtThe displacement may be calculated by dividing the variation of the displacement by time, specifically, by the following formula:
Figure BDA0002595279850000075
wherein, Δ xt-ΔtAnd Δ yt-ΔtRespectively, the displacement in the X-axis and Y-axis at time t- Δ t, and of course
Figure BDA0002595279850000076
And formula
Figure BDA0002595279850000077
And calculating by using a formula. Of course, the displacement variation of Δ t in the interval between the time t and the time t is divided by twice Δ t, so that the average speed in the time period of Δ t in the interval between the time t and the time t is obtained, and when the time interval is sufficiently small, the average speed can be regarded as the instantaneous speed of the spindle axis at the time t.
Referring to fig. 4, fig. 4 is a schematic flow chart of a static pressure and dynamic static pressure spindle oil film stiffness damping real-time measurement method according to a third embodiment of the present invention.
Based on the second embodiment, the step S20 in this embodiment includes:
step S21: spreading the oil film into a plane, and meshing the oil film: n points in the z direction and m points in the theta direction;
step S22: calculating the oil film pressure at any grid point of the oil film according to the coordinate of the axis;
step S23: and multiplying the oil film pressure of each point by the area of a single grid, and then accumulating to obtain the bearing oil film force of the spindle axis.
Specifically, the oil film force of the bearing can be obtained by solving the Reynolds equation by a numerical difference method. First, the following dimensionless quantities are introduced:
x＝Rθ,
Figure BDA0002595279850000081
h＝Ch*＝C(1+cosθ),
Figure BDA0002595279850000082
where, x represents a dimensionless quantity, x is a circumferential coordinate, z is an axial coordinate, h is an oil film thickness, p is an oil film pressure, C is a radial clearance, is a centrifugal force, μ is an oil film viscosity, ω is a bearing rotational speed, and the other parameters are bearing structure parameters.
From this, the dimensionless Reynolds equation can be derived as follows:
Figure BDA0002595279850000083
spreading the oil film into a plane, and meshing the oil film: n points in the z direction, and m points in the theta direction. The point a is an arbitrary grid point, the grid coordinates thereof are (i, j), and as shown in fig. 4, the expression of the oil film pressure at the point a obtained by using the difference method is as follows:
Figure BDA0002595279850000084
here:
hi is the oil film thickness at any grid point A (i, j);
d is the diameter of the bearing;
l is the bearing length;
f (x, y) is a shaft center coordinate function, and the value of the function is determined by the position of the shaft center;
after the boundary condition is given, the oil film pressure pi, j at any grid point A (i, j) of the oil film can be obtained through iteration. And then, the oil film pressure of each point is multiplied by the area of the current grid, and then the sum is accumulated, so that the bearing oil film force at the given axis position can be obtained.
In addition, the embodiment of the invention also provides a storage medium, wherein the storage medium is stored with a static pressure and static pressure main shaft oil film rigidity damping real-time measurement program, and the static pressure and static pressure main shaft oil film rigidity damping real-time measurement program is executed by a processor to realize the steps of the static pressure and static pressure main shaft oil film rigidity damping real-time measurement method.
In addition, an embodiment of the present invention further provides a detection apparatus, where the apparatus includes: the device comprises a memory, a processor, two displacement sensors and a static pressure and static pressure main shaft oil film rigidity damping real-time measurement program which is stored on the memory and can run on the processor, wherein the static pressure and static pressure main shaft oil film rigidity damping real-time measurement program is configured to realize the steps of the static pressure and static pressure main shaft oil film rigidity damping real-time measurement method.
In addition, the embodiment of the invention also provides a static pressure and dynamic static pressure main shaft oil film stiffness damping real-time measurement system, which comprises:
a main shaft to be tested and a bearing;
detection device, detection device install in outside the main shaft that awaits measuring, and perpendicular to the diameter of axle direction of main shaft that awaits measuring, the device includes: the device comprises a memory, a processor, two displacement sensors and a static pressure and static pressure main shaft oil film rigidity damping real-time measurement program which is stored on the memory and can run on the processor, wherein the static pressure and static pressure main shaft oil film rigidity damping real-time measurement program is configured to realize the steps of the static pressure and static pressure main shaft oil film rigidity damping real-time measurement method.
Referring to fig. 4, fig. 4 is a structural block diagram of a static pressure and static pressure spindle oil film stiffness damping real-time measuring device according to a first embodiment of the present invention.
As shown in fig. 4, the device for measuring the oil film stiffness damping of the static pressure and dynamic and static pressure main shaft in real time provided by the embodiment of the invention comprises:
the acquisition module is used for acquiring the displacement of the axis of the spindle in the direction of the section of the spindle;
the calculation module is used for calculating the speed of the axis of the main shaft and the force of a bearing oil film according to the displacement of the axis of the main shaft in the direction of the section of the axis of the main shaft;
and the calculation module is also used for calculating the rigidity coefficient and the damping coefficient of the main shaft oil film according to the speed, the displacement and the bearing oil film force.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
In the embodiment, the spindle oil film stiffness damping can be calculated in real time by acquiring the displacement of the axis of the spindle in the direction of the section of the spindle, namely acquiring the motion track of the axis of the spindle, so that the spindle oil film stiffness damping can be measured in real time.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details not described in detail in this embodiment can be referred to the static pressure and dynamic and static pressure spindle oil film stiffness damping real-time measurement method provided in any embodiment of the present invention, and are not described herein again.
Based on the first embodiment of the device for measuring the oil film stiffness and damping of the static pressure and dynamic and static pressure main shafts in real time, the second embodiment of the device for measuring the oil film stiffness and damping of the static pressure and dynamic and static pressure main shafts is provided.
In this embodiment, the calculation module is further configured to:
spreading the oil film into a plane, and meshing the oil film: n points in the z direction and m points in the theta direction;
calculating the oil film pressure at any grid point of the oil film according to the coordinate of the axis;
and multiplying the oil film pressure of each point by the area of a single grid, and then accumulating to obtain the bearing oil film force of the spindle axis.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
In the embodiment, the oil film is subjected to meshing so as to calculate the oil film pressure at any mesh point of the oil film according to the coordinate of the axis, and then the oil film pressure at each point is multiplied by the area of a single mesh to be accumulated to obtain the bearing oil film force of the axis of the spindle.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details not described in detail in this embodiment can be referred to the static pressure and dynamic and static pressure spindle oil film stiffness damping real-time measurement method provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A static pressure and dynamic and static pressure main shaft oil film rigidity damping real-time measuring method is characterized by comprising the following steps:
obtaining the displacement of the axis of the spindle in the direction of the section of the spindle;
calculating the speed of the axis of the main shaft and the force of a bearing oil film according to the displacement of the axis of the main shaft in the direction of the section of the main shaft;
and calculating the rigidity coefficient and the damping coefficient of the main shaft oil film according to the speed, the displacement and the bearing oil film force.
2. The method of claim 1, wherein the step of obtaining the displacement of the axis of the spindle in the direction of the section of the spindle further comprises establishing a coordinate system on the cross section of the spindle, with the position of the center of the spindle when the centers of the spindle and the bearing overlap as an origin, and accordingly, the stiffness coefficient and the damping coefficient of the spindle oil film are calculated according to the following formula:
Figure FDA0002595279840000011
Figure FDA0002595279840000012
Figure FDA0002595279840000013
Figure FDA0002595279840000014
where t refers to a certain time, Δ t refers to a time interval, Kxx_tAnd Kxy_tRespectively refers to the rigidity coefficient C of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the x-axis direction at the time of txx_tAnd Cxy_tRespectively refers to the damping coefficient K of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the x-axis direction at the time of tyx_tAnd Kyy_tRespectively refers to the rigidity coefficient of the displacement of the oil film of the main shaft in the x-axis direction and the y-axis direction under the stress in the y-axis direction at the time of t, Cyx_tAnd Cyy_tRespectively refers to the damping coefficient u of the displacement of the main shaft oil film in the x-axis direction and the y-axis direction under the stress in the y-axis direction at the time of ttAnd vtThe speed components of the spindle axis in the X-axis and Y-axis at time t, ut+ΔtAnd vt+ΔtThe speed components of the spindle axis in the X-axis and Y-axis at times t + Δ t, respectively, Δ Xt+ΔtAnd Δ yt+ΔtRefer to the displacements of the spindle axis in the X-axis and Y-axis, FX, relative to the origin at time t + Δ t, respectivelytAnd FYtComponent of bearing oil film force on X-axis and Y-axis at time t, FX, respectively, referring to the position of the shaft centert+ΔtAnd FYt+ΔtThe components of the bearing oil film force on the X axis and the Y axis at time t + Δ t of the axial center position, respectively.
3. The method of claim 2, wherein the velocity of the spindle axis calculated from the displacement of the spindle axis in the direction of the cross section thereof is calculated according to the following formula:
Figure FDA0002595279840000021
wherein, Δ xt-ΔtAnd Δ yt-ΔtRespectively, at time t- Δ t on the X-axis and Y-axisDisplacement of (2).
4. The method of claim 2, wherein the step of calculating the bearing oil film force of the spindle axis from the displacement of the spindle axis in the direction of the cross section thereof comprises:
spreading the oil film into a plane, and meshing the oil film: n points in the z direction and m points in the theta direction;
calculating the oil film pressure at any grid point of the oil film according to the coordinate of the axis;
and multiplying the oil film pressure of each point by the area of a single grid, and then accumulating to obtain the bearing oil film force of the spindle axis.
5. The method of claim 4, wherein the calculation of the oil film pressure at any grid point of the oil film based on the coordinates of the axis is calculated by the following formula:
Figure FDA0002595279840000022
wherein, represents a dimensionless quantity, hiIs the oil film thickness at any grid point (i, j), D is the bearing diameter, L is the bearing length, f (x, y) is the coordinate function of the spindle axis, pi,jIs the oil film pressure at any grid point (i, j).
6. The utility model provides a static pressure, dynamic and static pressure main shaft oil film rigidity damping real-time measurement device which characterized in that, the device includes:
the acquisition module is used for acquiring the displacement of the axis of the spindle in the direction of the section of the spindle;
the calculation module is used for calculating the speed of the axis of the main shaft and the force of a bearing oil film according to the displacement of the axis of the main shaft in the direction of the section of the axis of the main shaft;
and the calculation module is also used for calculating the rigidity coefficient and the damping coefficient of the main shaft oil film according to the speed, the displacement and the bearing oil film force.
7. The device for measuring the oil film stiffness and damping of the static-pressure and dynamic-static-pressure main shaft according to claim 6, wherein the calculation module is further used for:
spreading the oil film into a plane, and meshing the oil film: n points in the z direction and m points in the theta direction;
calculating the oil film pressure at any grid point of the oil film according to the coordinate of the axis;
and multiplying the oil film pressure of each point by the area of a single grid, and then accumulating to obtain the bearing oil film force of the spindle axis.
8. A detection device, the device comprising: the real-time measuring method comprises a memory, a processor, two displacement sensors and a real-time measuring program of the oil film stiffness damping of the static pressure and the dynamic and static pressure main shafts, wherein the real-time measuring program of the oil film stiffness damping of the static pressure and the dynamic and static pressure main shafts is stored on the memory and can run on the processor, and is configured to realize the steps of the real-time measuring method of the oil film stiffness damping of the static pressure and the dynamic and static pressure main shafts according to any one of claims 1 to 5.
9. A storage medium, wherein a static pressure and static pressure spindle oil film stiffness damping real-time measurement program is stored on the storage medium, and when the static pressure and static pressure spindle oil film stiffness damping real-time measurement program is executed by a processor, the steps of the static pressure and static pressure spindle oil film stiffness damping real-time measurement method according to any one of claims 1 to 5 are realized.
10. The utility model provides a static pressure, dynamic and static pressure main shaft oil film rigidity damping real-time measurement system which characterized in that includes:
a main shaft to be tested and a bearing;
the detection device is installed outside the spindle to be detected and perpendicular to the axial diameter direction of the spindle to be detected, and the detection device is the detection device according to claim 8.
CN202010715277.8A 2020-07-21 2020-07-21 Static pressure and dynamic and static pressure main shaft oil film rigidity damping real-time measurement method and device, detection device, storage medium and system Pending CN111730410A (en)

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