CN118500667A - Method for rapidly positioning vibration fault of rotary machine - Google Patents

Abstract

The present invention proposes a method for quickly locating a vibration fault of a rotating machinery, by obtaining vibration data of a monitoring node of the rotating machinery, wherein the vibration data includes the amplitude of the monitoring node, and judging whether the monitoring node has a vibration abnormality according to the vibration data of the monitoring node. When the monitoring node has a vibration abnormality, the cause of the abnormality is located using a first vibration abnormality diagnosis formula, wherein the first vibration abnormality diagnosis formula is: ,in is the amplitude of the vibration response at the monitoring node, is the rotor rotation force at the monitoring node, is the fluid force at the monitoring node, is the other force at the monitoring node, It is the total stiffness of the rotating machinery and can quickly locate the fault direction when abnormal vibration occurs in the rotating machinery.

Description

Method for quickly locating vibration faults in rotating machinery

Technical Field

The invention relates to the technical field of fault diagnosis, and in particular to a method for quickly locating vibration faults of rotating machinery.

Background Art

During the operation of rotating machinery such as centrifugal compressors, axial compressors, blowers or steam turbines, the rotor drives the rotating parts to move at high speed to drive the medium inside the machinery, which inevitably causes the mechanical equipment to vibrate. The vibration data of rotating machinery can usually reflect the health of the rotating machinery, so monitoring the vibration data of rotating machinery is a necessary measure for the maintenance of rotating machinery. However, there are many factors that affect the vibration of rotating machinery. When the vibration data of rotating machinery is abnormal, how to quickly locate the cause of the fault based on the vibration data has always been a difficult problem that has troubled people.

Summary of the invention

The present invention is based on the above-mentioned problem and proposes a method for quickly locating vibration faults of rotating machinery, which can quickly locate the fault direction when abnormal vibration occurs in the rotating machinery.

In view of this, the present invention proposes a method for quickly locating a vibration fault of a rotating machinery, comprising:

Acquiring vibration data of a monitoring node of a rotating machinery, wherein the vibration data includes an amplitude of the monitoring node;

Determining whether abnormal vibration occurs at the monitoring node according to the vibration data of the monitoring node;

When the monitoring node has abnormal vibration, the first vibration abnormality diagnosis formula is used to locate the abnormal cause, and the first vibration abnormality diagnosis formula is:

,

in is the amplitude of the vibration response at the monitoring node, is the rotor rotation force at the monitoring node, is the fluid force at the monitoring node, is the other force at the monitoring node, is the total stiffness of the rotating machinery.

Further, the step of using the first vibration abnormality diagnosis formula to locate the abnormality cause specifically includes:

Adjust the rotor rotation force at the monitoring node ;

By adjusting the rotor rotation force at the monitoring node while monitoring the amplitude of the monitoring node;

Identify the rotor rotational force at the monitoring node The correlation between the change of and the amplitude change of the monitoring node;

When the rotor rotation force at the monitoring node When the amplitude of the monitoring node increases, it is determined that the abnormal vibration of the monitoring node is caused by the rotor rotation force at the monitoring node. cause.

Further, the rotor rotation force at the monitoring node is adjusted The steps specifically include:

Determine the eccentric mass of the rotor and eccentricity ;

Adjusting the angular velocity of the rotor Or the rotation speed To adjust the rotor rotation force:

.

Further, the step of using the first vibration abnormality diagnosis formula to locate the abnormality cause also includes:

Controlling the rotation speed of the rotor to reach a preset working speed;

Regulating the load in the rotating machine ;

In regulating the load in the rotating machine while monitoring the amplitude of the monitoring node;

Identify the loads in the rotating machinery The correlation between the size change of and the amplitude change of the monitoring node;

When the load in the rotating machinery When the amplitude of the monitoring node increases, it is determined that the abnormal vibration of the monitoring node is caused by the fluid force at the monitoring node. cause.

Further, adjusting the load in the rotating machine The steps specifically include:

Get the pressure of the material inlet and temperature ;

Adjust the flow rate of fluid materials at the material inlet The size of the rotating machine is to adjust the load:

,

in is the compressibility coefficient of the fluid material.

Further, the step of using the first vibration abnormality diagnosis formula to locate the abnormality cause also includes:

In determining the vibration anomaly of the monitoring node and the rotor rotation force at the monitoring node and determining whether the vibration anomaly of the monitoring node is related to the fluid force at the monitoring node. After that, the system stiffness of the rotating machinery Perform analysis to locate the cause of the anomaly.

Furthermore, the system stiffness of the rotating machinery The steps for conducting the analysis include:

The second vibration abnormality diagnosis formula is used to locate the abnormality cause. The second vibration abnormality diagnosis formula is:

,

in is the foundation stiffness at the monitoring node, is the bearing stiffness at the monitoring node, is the oil film stiffness at the monitoring node.

Further, the step of using the second vibration abnormality diagnosis formula to locate the abnormality cause specifically includes:

Checking the stability of the foundation of the rotating machinery;

Determine whether the rotating machine has foundation stiffness according to the foundation stability of the rotating machine Failure, the foundation stiffness Failures include loose bolts, loose grouting, and broken foundations.

Further, the step of using the second vibration abnormality diagnosis formula to locate the abnormality cause specifically includes:

Checking the stability of the bearings of the rotating machinery;

Determining whether the rotating machine has bearing stiffness according to the bearing stability of the rotating machine fault, the bearing stiffness Faults include bearing looseness, bearing wear, bearing deformation, bearing clearance, bearing backing tightness, and bearing-rotor contact.

Further, the step of using the second vibration abnormality diagnosis formula to locate the abnormality cause specifically includes:

Analyzing the bearing lubricating oil parameters of the rotating machinery;

Determine whether the rotating machine has oil film stiffness according to the analysis result of the lubricating oil parameter of the rotating machine Fault.

The present invention proposes a method for quickly locating a vibration fault of a rotating machinery, by obtaining vibration data of a monitoring node of the rotating machinery, wherein the vibration data includes the amplitude of the monitoring node, and judging whether the monitoring node has a vibration abnormality according to the vibration data of the monitoring node. When the monitoring node has a vibration abnormality, the cause of the abnormality is located using a first vibration abnormality diagnosis formula, wherein the first vibration abnormality diagnosis formula is: ,in is the amplitude of the vibration response at the monitoring node, is the rotor rotation force at the monitoring node, is the fluid force at the monitoring node, is the other force at the monitoring node, It is the total stiffness of the rotating machinery and can quickly locate the fault direction when abnormal vibration occurs in the rotating machinery.

DETAILED DESCRIPTION

In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, the term "multiple" refers to two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. The terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

In the description of this specification, the description of the terms "one embodiment", "some implementations", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Specifically, the present invention proposes a method for quickly locating a vibration fault of a rotating machinery, comprising:

Acquiring vibration data of a monitoring node of a rotating machinery, wherein the vibration data includes an amplitude of the monitoring node;

Determining whether abnormal vibration occurs at the monitoring node according to the vibration data of the monitoring node;

When the monitoring node has abnormal vibration, the first vibration abnormality diagnosis formula is used to locate the abnormal cause, and the first vibration abnormality diagnosis formula is:

,

in is the amplitude of the vibration response at the monitoring node, is the rotor rotation force at the monitoring node, is the fluid force at the monitoring node, is the other force at the monitoring node, is the total stiffness of the rotating machinery.

Large rotating machinery can be equipped with vibration sensors at one or more locations of the equipment as needed to monitor its vibration conditions. The rotating machinery monitoring node referred to in the present invention refers to the location where the vibration sensor is set. The vibration data of the rotating machinery monitoring node includes its vibration displacement, vibration velocity, and vibration acceleration data. One or more of the single peak value, peak-to-peak value, and effective value of each vibration cycle can be determined as the amplitude of the vibration cycle. The vibration abnormality of the monitoring node of the rotating machinery refers to the situation where the vibration amplitude exceeds the standard in the vibration data of the monitoring node of the rotating machinery monitored, that is, when the rotating machinery has a vibration abnormality, it will usually be manifested in the amplitude, that is, the situation where the amplitude is significantly greater than the threshold can be regarded as a vibration abnormality. Exceeding the standard vibration amplitude may cause huge vibration noise, valve loosening, motor or pipeline damage, loosening and damage of the bearings or fuselage connectors of the rotating machinery, etc.

In the technical solution of the present invention, the first vibration abnormality diagnosis formula The fault direction of the rotating machinery can be quickly determined, and the rotating machinery can be quickly inspected and maintained accordingly, without wasting a lot of manpower and material resources and a lot of time on blindly and comprehensively checking the rotating machinery. This greatly simplifies the fault diagnosis process of the rotating machinery and provides effective diagnostic direction guidance for the fault diagnosis of the rotating machinery.

Further, the step of using the first vibration abnormality diagnosis formula to locate the abnormality cause specifically includes:

Adjust the rotor rotation force at the monitoring node ;

By adjusting the rotor rotation force at the monitoring node while monitoring the amplitude of the monitoring node;

Identify the rotor rotational force at the monitoring node The correlation between the change of and the amplitude change of the monitoring node;

When the rotor rotation force at the monitoring node When the amplitude of the monitoring node increases, it is determined that the abnormal vibration of the monitoring node is caused by the rotor rotation force at the monitoring node. cause.

In the absence of faults, the amplitude of the rotating machinery is relatively stable, and the rotor rotation force at the monitoring node The increase will not cause a significant change in the amplitude of the rotating machinery if the rotor rotation force at the monitoring node As the vibration amplitude of the rotating machine increases, it can be determined that the vibration anomaly is caused by the rotor rotation force at the monitoring node. caused by.

Specifically, when the vibration anomaly is caused by the rotor rotation force at the monitoring node If it is caused by, then the rotating machinery may have a rotor mass imbalance fault or a rotor misalignment fault.

The rotor mass imbalance fault is a fault state caused by the misalignment of the mass and the geometric center line. When the rotor with mass imbalance rotates, its center of gravity generates a centrifugal force acting on the bearing. The faster the rotor speed, the greater the force it exerts on the bearing, causing the vibration intensity of the rotating machinery to increase with the increase in speed. When the rotor mass imbalance is static imbalance, its vibration abnormality is mainly manifested as an increase in radial amplitude, and when the rotor mass imbalance is dynamic imbalance, its vibration abnormality is mainly manifested as an increase in axial amplitude.

Rotor misalignment is a fault state caused by the inclination or offset between the axis line of two adjacent rotors and the center line of the bearing. When the misaligned rotor rotates, additional bending moment and additional load will be generated, resulting in the redistribution of the bearing load, forming additional excitation and causing strong vibration of the unit. Similarly, the faster the rotor speed, the greater the vibration intensity caused. When the rotor misalignment is parallel misalignment, the vibration abnormality is mainly manifested as an increase in radial amplitude, and when the rotor misalignment is angular misalignment, the vibration abnormality is mainly manifested as an increase in axial amplitude.

Further, the rotor rotation force at the monitoring node is identified After the step of correlating the change of the voltage at the monitoring node with the change of the amplitude of the monitoring node, the method further comprises:

When the rotor rotation force at the monitoring node When the amplitude of the monitoring node does not have a significant increasing trend, it is determined that the vibration anomaly of the monitoring node is related to the rotor rotation force at the monitoring node. Not relevant.

Further, the rotor rotation force at the monitoring node is adjusted The steps specifically include:

Determine the eccentric mass of the rotor and eccentricity ;

Adjusting the angular velocity of the rotor Or the rotation speed To adjust the rotor rotation force:

.

Further, the step of using the first vibration abnormality diagnosis formula to locate the abnormality cause also includes:

Controlling the rotation speed of the rotor to reach a preset working speed;

Regulating the load in the rotating machine ;

In regulating the load in the rotating machine while monitoring the amplitude of the monitoring node;

Identify the loads in the rotating machinery The correlation between the size change of and the amplitude change of the monitoring node;

When the load in the rotating machinery When the amplitude of the monitoring node increases, it is determined that the abnormal vibration of the monitoring node is caused by the fluid force at the monitoring node. cause.

Further, adjusting the load in the rotating machine The steps specifically include:

Get the pressure of the material inlet and temperature ;

Adjust the flow rate of fluid materials at the material inlet The size of the rotating machine is to adjust the load:

,

in is the compressibility coefficient of the fluid material.

Specifically, the preset operating speed may be the rated speed of the rotor, or another pre-configured speed. The size of the fluid material is related to the amount of water, gas and other fluid materials supplied in the rotating machinery, that is, the flow rate of the fluid material at the material inlet Size, pressure and temperature Related, the temperature at the material inlet Under the condition of no change, by adjusting the flow rate of fluid materials Or adjust the pressure of the material inlet To adjust the load in the rotating machinery Similarly, in the absence of faults, the amplitude of the rotating machinery is relatively stable, and the load in the rotating machinery The change in the magnitude of will not cause a significant change in the amplitude of the rotating machinery. The load in the rotating machinery positively correlated, if the load in the rotating machinery As the vibration amplitude of the rotating machine increases, it can be determined that the vibration anomaly is caused by the fluid force at the monitoring node. caused by.

Since the movement of fluid logistics itself is highly complex, the rotating machinery is greatly affected by the movement of the fluid materials, so the fluid force It is an important factor affecting the dynamic performance stability of the rotating machinery. When the vibration abnormality is caused by the fluid force at the monitoring node If it is caused by the uneven distribution of flow velocity and pressure at the inlet of the fluid material, or the pressure pulsation, bypass, deviation or separation of the fluid material inlet and outlet, the rotating machinery may have a fault. Of course, the dynamic transition process such as the start or stop of the rotor of the rotating machinery, the opening or closing of the valve, etc., which causes the rapid change of pressure in the material pipeline, the water hammer effect and other fluid forces. The drastic changes in the rotating machinery may also cause abnormal vibration of the rotating machinery.

Furthermore, in identifying the load in the rotating machine After the step of correlating the size change of the monitoring node with the amplitude change of the monitoring node, the method further includes:

When the load in the rotating machinery When the amplitude of the monitoring node does not have an obvious increasing trend, it is determined that the vibration abnormality of the monitoring node is related to the fluid force at the monitoring node. Not relevant.

Further, the step of using the first vibration abnormality diagnosis formula to locate the abnormality cause also includes:

In determining the vibration anomaly of the monitoring node and the rotor rotation force at the monitoring node and determining whether the vibration anomaly of the monitoring node is related to the fluid force at the monitoring node. After that, the system stiffness of the rotating machinery Perform analysis to locate the cause of the anomaly.

Affected by the implementation environment of rotating machinery, rotating machinery has the following characteristics in addition to the rotor rotation force: and fluid forces of fluid materials In addition, it is rarely affected by other forces. Therefore, in determining the vibration anomaly of the monitoring node and the rotor rotation force at the monitoring node, and determining whether the vibration anomaly of the monitoring node is related to the fluid force at the monitoring node. After all, the abnormal vibration of the rotating machinery is most likely due to the system stiffness Caused by a malfunction.

Furthermore, the system stiffness of the rotating machinery The steps for conducting the analysis include:

The second vibration abnormality diagnosis formula is used to locate the abnormality cause. The second vibration abnormality diagnosis formula is:

,

in is the foundation stiffness at the monitoring node, is the bearing stiffness at the monitoring node, is the oil film stiffness at the monitoring node.

Specifically, the second vibration abnormality diagnosis formula is The first vibration abnormality diagnosis formula is Based on the system stiffness Expand it to get the system stiffness of rotating machinery Including foundation stiffness , bearing stiffness and oil film stiffness , when the system stiffness of the rotating machinery When a failure occurs, it may be the foundation stiffness , bearing stiffness and oil film stiffness One or more of the following has failed.

Further, the step of using the second vibration abnormality diagnosis formula to locate the abnormality cause specifically includes:

Checking the stability of the foundation of the rotating machinery;

Determine whether the rotating machine has foundation stiffness according to the foundation stability of the rotating machine Failure, the foundation stiffness Failures include loose bolts, loose grouting, and broken foundations.

Foundation stiffness of rotating machinery It indicates the stability of the foundation of the rotating machinery. In order to ensure that the foundation is stable enough and reduce equipment vibration and equipment failure caused by strong vibration, large rotating machinery will be fixed to the base through anchor bolts, and the base will be grouted, that is, reinforced concrete will be used to cast the foundation of the large rotating machinery. In the technical scheme of the above-mentioned implementation, the inspection of the stability of the foundation of the rotating machinery includes checking whether the anchor bolts are loose, whether the grouting is stable, whether the foundation is damaged, etc., wherein foundation damage includes damage to the base and grouting, etc.

Further, the step of using the second vibration abnormality diagnosis formula to locate the abnormality cause specifically includes:

Checking the stability of the bearings of the rotating machinery;

Determining whether the rotating machine has bearing stiffness according to the bearing stability of the rotating machine fault, the bearing stiffness Faults include bearing looseness, bearing wear, bearing deformation, bearing clearance, bearing backing tightness, and bearing-rotor contact.

Bearing stiffness of rotating machinery It indicates the stability of the bearing of the rotating machinery. The loose bearing fault is manifested as a fault caused by the bearing clearance being greater than the standard bearing clearance. The bearing clearance is specifically the amount of movement between the bearing and its inner or outer ring in the radial or axial direction. According to the direction of the movement, the bearing clearance is divided into radial clearance and axial clearance. The loose bearing may be caused by the poor fit between the inner and outer ring components and the bearing during installation, or it may be caused by the wear of the bearing or its inner and outer ring components. The bearing of the rotating machinery can be a rolling bearing or a sliding bearing.

When the bearing of the rotating machinery is a rolling bearing, the loosening failure of the bearing may be caused by fatigue peeling of the inner and outer ring raceways of the bearing, bearing wear, plastic deformation of the bearing raceway or rolling element, rust of the bearing material, failure of the bearing bonding, or damage to the bearing retainer.

When the bearing of the rotating machine is a sliding bearing, the loosening failure of the bearing may be caused by the loosening of the Babbitt alloy, the damage of the Babbitt alloy, the loose fit of the bearing housing, and the excessive bearing clearance.

Typically, when a bearing is worn, it will cause the bearing to become rotationally loose. The bearing's rotational looseness fault will manifest itself in the vibration data as relatively obvious medium and low frequency vibration components. The medium and low frequency vibration components referred to here are mainly vibration components with frequencies below 1000 Hz.

Further, the step of using the second vibration abnormality diagnosis formula to locate the abnormality cause specifically includes:

Analyzing the bearing lubricating oil parameters of the rotating machinery;

Determine whether the rotating machine has oil film stiffness according to the analysis result of the lubricating oil parameter of the rotating machine Fault.

Oil film stiffness It refers to the ability to keep a given oil film thickness unchanged under external load, which reflects the load-bearing capacity of the oil film. The fault refers to the deterioration of the bearing lubricating oil, which leads to the oil film stiffness. Insufficient, that is, the failure caused by the oil film thickness failing to meet the standard thickness requirement under the action of external load. The bearing lubricating oil parameters include but are not limited to the viscosity, oxidation resistance, wear resistance, corrosion resistance, cleanliness, etc. of the lubricating oil. By analyzing the lubricating oil in the bearing, it can be determined whether the oil film stiffness is caused by the bearing lubricating oil parameters. Fault. Oil film stiffness Insufficient pressure will lead to bearing wear, bearing bonding failure and other faults.

It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (10)

1. A method for quickly locating a vibration fault of a rotating machine, characterized by comprising: Acquiring vibration data of a monitoring node of a rotating machinery, wherein the vibration data includes an amplitude of the monitoring node; Determining whether abnormal vibration occurs at the monitoring node according to the vibration data of the monitoring node; When the monitoring node has abnormal vibration, the first vibration abnormality diagnosis formula is used to locate the abnormal cause, and the first vibration abnormality diagnosis formula is: , in is the amplitude of the vibration response at the monitoring node, is the rotor rotation force at the monitoring node, is the fluid force at the monitoring node, is the other force at the monitoring node, is the total stiffness of the rotating machinery. 2. The method for quickly locating a vibration fault of a rotating machine according to claim 1, wherein the step of locating the cause of the abnormality using the first vibration abnormality diagnosis formula specifically comprises: Adjust the rotor rotation force at the monitoring node ; By adjusting the rotor rotation force at the monitoring node while monitoring the amplitude of the monitoring node; Identify the rotor rotational force at the monitoring node The correlation between the change of and the amplitude change of the monitoring node; When the rotor rotation force at the monitoring node When the amplitude of the monitoring node increases, it is determined that the abnormal vibration of the monitoring node is caused by the rotor rotation force at the monitoring node. cause. 3. The method for quickly locating vibration faults of rotating machinery according to claim 2, characterized in that the rotor rotation force at the monitoring node is adjusted The steps specifically include: Determine the eccentric mass of the rotor and eccentricity ; Adjusting the angular velocity of the rotor Or the rotation speed To adjust the rotor rotation force: . 4. The method for quickly locating a vibration fault of a rotating machine according to claim 2, wherein the step of locating the cause of the abnormality using the first vibration abnormality diagnosis formula further comprises: Controlling the rotation speed of the rotor to reach a preset working speed; Regulating the load in the rotating machine ; In regulating the load in the rotating machine while monitoring the amplitude of the monitoring node; Identify the loads in the rotating machinery The correlation between the size change of and the amplitude change of the monitoring node; When the load in the rotating machinery When the amplitude of the monitoring node increases, it is determined that the abnormal vibration of the monitoring node is caused by the fluid force at the monitoring node. cause. 5. The method for quickly locating vibration faults of rotating machinery according to claim 4, characterized in that the load in the rotating machinery is adjusted The steps specifically include: Get the pressure of the material inlet and temperature ; Adjust the flow rate of fluid materials at the material inlet The size of the rotating machine is to adjust the load: , in is the compressibility coefficient of the fluid material. 6. The method for quickly locating a vibration fault of a rotating machine according to claim 4, characterized in that the step of locating the cause of the abnormality using the first vibration abnormality diagnosis formula further comprises: In determining the vibration anomaly of the monitoring node and the rotor rotation force at the monitoring node and determining whether the vibration anomaly of the monitoring node is related to the fluid force at the monitoring node. After that, the system stiffness of the rotating machinery Perform analysis to locate the cause of the anomaly. 7. The method for quickly locating vibration faults of rotating machinery according to claim 6, characterized in that the system stiffness of the rotating machinery The steps for conducting the analysis include: The second vibration abnormality diagnosis formula is used to locate the abnormality cause. The second vibration abnormality diagnosis formula is: , in is the foundation stiffness at the monitoring node, is the bearing stiffness at the monitoring node, is the oil film stiffness at the monitoring node. 8. The method for quickly locating a vibration fault of a rotating machine according to claim 7, wherein the step of locating the cause of the abnormality using the second vibration abnormality diagnosis formula specifically comprises: Checking the stability of the foundation of the rotating machinery; Determine whether the rotating machine has foundation stiffness according to the foundation stability of the rotating machine Failure, the foundation stiffness Failures include loose bolts, loose grouting, and broken foundations. 9. The method for quickly locating a vibration fault of a rotating machine according to claim 7, wherein the step of locating the cause of the abnormality using the second vibration abnormality diagnosis formula specifically comprises: Checking the stability of the bearings of the rotating machinery; Determining whether the rotating machine has bearing stiffness according to the bearing stability of the rotating machine fault, the bearing stiffness Faults include bearing looseness, bearing wear, bearing deformation, bearing clearance, bearing backing tightness, and bearing-rotor contact. 10. The method for quickly locating a vibration fault of a rotating machine according to claim 7, wherein the step of locating the cause of the abnormality using the second vibration abnormality diagnosis formula specifically comprises: Analyzing the bearing lubricating oil parameters of the rotating machinery; Determine whether the rotating machine has oil film stiffness according to the analysis result of the lubricating oil parameter of the rotating machine Fault.