CN111241730A - Method and device for determining critical transverse force of threaded connection - Google Patents
Method and device for determining critical transverse force of threaded connection Download PDFInfo
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- CN111241730A CN111241730A CN202010014019.7A CN202010014019A CN111241730A CN 111241730 A CN111241730 A CN 111241730A CN 202010014019 A CN202010014019 A CN 202010014019A CN 111241730 A CN111241730 A CN 111241730A
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Abstract
The invention provides a method and a device for determining critical transverse force of threaded connection, wherein the method comprises the following steps: creating a threaded connection model; periodically applying a first transverse force of a first preset number of cycles and a second transverse force of the first preset number of cycles to the movable plate model in a preset direction perpendicular to the axial direction of the bolt model, and acquiring a test pretightening force of each cycle; and obtaining a judgment result of whether the threaded connection model is loosened or not according to the test pretightening force, and determining a critical transverse force according to the judgment result. In the embodiment of the invention, the first transverse force is periodically applied to the movable plate model before formal testing to accelerate stress redistribution, and the influence of stress redistribution on testing is fully considered, so that the threaded connection model finishes stress redistribution when formal testing is carried out, and the accuracy of testing pretightening force and final critical transverse force in the subsequent testing process is further ensured.
Description
Technical Field
The invention relates to the technical field of mechanical engineering, in particular to a method and a device for determining a critical transverse force of threaded connection.
Background
The threaded connection is one of the most widely applied connection modes in the fields of machinery, construction, traffic, aviation, aerospace, ships, furniture and the like, can generate great connection force, is convenient to repeatedly disassemble and assemble, is easy for mass production, and has low manufacturing cost. However, the cyclic lateral vibration easily causes the internal and external threads to be loosened by rotation, which not only reduces the connection force, but also induces the overall breakage of the threaded connection structural member (such as a bolt), causing serious safety accidents. Therefore, accurately calculating the critical transverse force of the internal and external thread rotation loosening is important for the anti-loosening design of the threaded connection. At present, finite element simulation has become an important method for researching the loosening and the looseness prevention of the threaded connection, however, the traditional finite element simulation method directly applies transverse vibration to the threaded connection, the influence of stress redistribution is neglected, and the critical transverse force of the rotational loosening of the threaded connection cannot be accurately obtained.
Disclosure of Invention
The technical purpose to be achieved by the embodiment of the invention is to provide a method and a device for determining the critical transverse force of threaded connection, which are used for solving the problem that the critical transverse force of the threaded connection which is loosened by rotation cannot be accurately obtained because the influence of stress redistribution is neglected when the current threaded connection is subjected to finite element simulation.
In order to solve the above technical problem, an embodiment of the present invention provides a method for determining a critical transverse force of a threaded connection, including:
creating a threaded connection model, the threaded connection model including at least: the bolt model penetrates through the movable plate model and is in threaded connection with the nut model through a preset pretightening force;
periodically applying a first transverse force to the movable plate model in a preset direction, wherein the preset direction is perpendicular to the axial direction of the bolt model;
when the application period of the first transverse force reaches a first preset number, periodically applying a second transverse force to the movable plate model in the preset direction, and acquiring the test pretightening force of each period, wherein the second transverse force is a first candidate in a preset transverse force equal difference sequence;
and when the application period of the second transverse force reaches a second preset number, obtaining a judgment result of whether the threaded connection model is loosened according to the test pretightening force, and determining the critical transverse force according to the judgment result.
Preferably, in the method for determining the critical transverse force of the threaded connection, when the row of the equal difference of the transverse forces is a descending row, the step of determining the critical transverse force according to the judgment result includes:
if the threaded connection model is determined to be loosened, updating the second transverse force to be an option in the transverse force arithmetic progression, initializing the threaded connection model, and returning to the step of applying a first transverse force of a first preset period to the movable plate in a preset direction;
and if the threaded connection model is determined not to be loosened, determining the second transverse force as a critical transverse force.
Alternatively, in the method for determining the critical transverse force of the threaded connection, when the row of the equal difference of the transverse forces is an increasing row, the step of determining the critical transverse force according to the judgment result includes:
if the threaded connection model is determined not to be loosened, updating the second transverse force to be an option in the transverse force arithmetic progression, initializing the threaded connection model, and returning to execute the step of applying a first transverse force of a first preset period to the movable plate in the preset direction;
and if the threaded connection model is determined to be loosened, determining the transverse force corresponding to the selected item adjacent to the second transverse force in the transverse force equal difference array as a critical transverse force.
Preferably, in the method for determining the critical lateral force of threaded connection, the step of determining whether the threaded connection model is loose according to the test pretension force of each period includes:
dividing the testing pretightening force of each period into a plurality of regions according to the period sequence, wherein each region comprises a third preset number of periods;
obtaining the pretightening force change rate of each region according to the first test pretightening force and the last test pretightening force of each region;
determining a region with the pretightening force change rate within a preset range as a target region, and determining that the threaded connection model is loosened when the continuous number of the target region in the period sequence is greater than a first threshold value; otherwise, determining that the threaded connection model is not loosened.
Specifically, the method for determining a critical transverse force of a threaded connection as described above, after the step of creating a threaded connection model, further comprises:
acquiring the end surface contact friction coefficient of the nut model and the movable plate model;
obtaining end face contact friction according to a preset pretightening force and an end face contact friction coefficient;
and obtaining a first transverse force according to the end face contact friction force and a preset first proportion.
Further, the method for determining the critical transverse force of the threaded connection as described above further includes: and obtaining a transverse force equal difference series according to the end face contact friction force and a preset proportion equal difference series, wherein the tolerance in the proportion equal difference series is a preset proportion.
Specifically, in the method for determining the critical transverse force of the threaded connection as described above, the first transverse force is greater than or equal to the second transverse force.
Preferably, in the method for determining the critical transverse force of a threaded connection as described above, the second predetermined number is greater than the first predetermined number.
Still another preferred embodiment of the present invention provides a device for determining a critical lateral force of a threaded connection, including:
a first processing module for creating a threaded connection model, the threaded connection model comprising at least: the bolt model penetrates through the movable plate model and is in threaded connection with the nut model through a preset pretightening force;
the second processing module is used for periodically applying a first transverse force to the movable plate model in a preset direction, and the preset direction is perpendicular to the axial direction of the bolt model;
the third processing module is used for periodically applying a second transverse force to the movable plate model in the preset direction when the application period of the first transverse force reaches a first preset number, and acquiring the test pretightening force of each period, wherein the second transverse force is a first candidate in a preset transverse force arithmetic sequence;
and the fourth processing module is used for obtaining a judgment result of whether the threaded connection model is loosened or not according to the test pretightening force when the application period of the second transverse force reaches a second preset number, and determining the critical transverse force according to the judgment result.
Preferably, the device for determining a critical transverse force of a threaded connection as described above, the fourth processing module comprises:
the first processing unit is used for updating the second transverse force to be an option in the transverse force arithmetic progression if the threaded connection model is determined to be loosened, initializing the threaded connection model and returning to the step of applying a first transverse force of a first preset period to the movable plate in the preset direction;
and the second processing unit is used for determining that the second transverse force is a critical transverse force if the threaded connection model is determined not to be loosened.
Optionally, the device for determining a critical lateral force of a threaded connection as described above, the fourth processing module further comprises:
a third processing unit, configured to update the second lateral force to be an option in the row of the lateral force arithmetic progression if it is determined that the threaded connection model is not loosened, initialize the threaded connection model, and return to performing the step of applying the first lateral force to the movable plate for the first preset period in the preset direction;
and the fourth processing unit is used for determining that the transverse force corresponding to the selected item adjacent to the second transverse force in the transverse force arithmetic progression is the critical transverse force if the threaded connection model is determined to be loosened.
Preferably, the device for determining a critical transverse force for a threaded connection as described above, the fourth processing module further comprises:
the fifth processing unit is used for dividing the testing pretightening force of each period into a plurality of regions according to the period sequence, and each region comprises a third preset number of periods;
the sixth processing unit is used for obtaining the pretightening force change rate of each area according to the first test pretightening force and the last test pretightening force of each area;
the seventh processing unit is used for determining that an area with the pretightening force change rate within a preset range is a target area, and determining that the threaded connection model is loosened when the continuous number of the target area in the period sequence is greater than a first threshold value; otherwise, determining that the threaded connection model is not loosened.
In particular, the device for determining the critical transverse force of a threaded connection as described above, further comprising:
the acquiring module is used for acquiring the end face contact friction coefficient of the nut model and the movable plate model;
the fifth processing module is used for obtaining end face contact friction according to a preset pretightening force and an end face contact friction coefficient;
and the sixth processing module is used for obtaining a first transverse force according to the end face contact friction force and a preset first proportion.
Another preferred embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method for determining a critical transverse force for a threaded connection as described above.
Compared with the prior art, the method and the device for determining the critical transverse force of the threaded connection provided by the embodiment of the invention at least have the following beneficial effects:
in an embodiment of the present invention, a threaded connection model is first created when a critical transverse force of the threaded connection is determined to be simulated. After a threaded connection model is established, periodically applying a first transverse force to the movable plate model in a preset direction for accelerating the stress redistribution of threaded connection, determining that the stress redistribution is completed when the application period of the first transverse force reaches a first preset number, periodically applying a second transverse force in the preset direction again for testing, and acquiring the testing pretightening force of each period; and when the application period of the second transverse force reaches a second preset number, determining that the test at the current stage is finished, determining a judgment result whether the threaded connection model is loosened under the current condition according to the obtained test pretightening force, and finally determining the critical transverse force of the threaded connection model according to the judgment result. According to the technical scheme, the first transverse force is periodically applied to the movable plate model, and the influence of the stress redistribution pair test is fully considered, so that the threaded connection model finishes stress redistribution when the test is formally carried out, and the accuracy of the test pretightening force and the final critical transverse force in the subsequent test process is further ensured.
Drawings
FIG. 1 is a schematic flow chart of a method for determining a critical transverse force for a threaded connection according to the present invention;
FIG. 2 is a schematic structural view of a preferred threaded connection model of the present invention;
FIG. 3 is a second flowchart of the method for determining a critical transverse force of a threaded connection according to the present invention;
FIG. 4 is a third flowchart illustrating a method for determining a critical transverse force of a threaded connection according to the present invention;
fig. 5 is a schematic structural view of the device for determining the critical transverse force of the threaded connection according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
Referring to fig. 1, a preferred embodiment of the present invention provides a method of determining a critical transverse force of a threaded connection, comprising:
step S101, creating a threaded connection model, wherein the threaded connection model at least comprises the following steps: the bolt model penetrates through the movable plate model and is in threaded connection with the nut model through a preset pretightening force;
step S102, periodically applying a first transverse force to the movable plate model in a preset direction, wherein the preset direction is perpendicular to the axial direction of the bolt model;
step S103, when the application period of the first transverse force reaches a first preset number, periodically applying a second transverse force to the movable plate model in the preset direction, and acquiring the test pretightening force of each period, wherein the second transverse force is a first candidate in a preset transverse force arithmetic sequence;
and step S104, when the application period of the second transverse force reaches a second preset number, obtaining a judgment result of whether the threaded connection model is loosened according to the test pretightening force, and determining a critical transverse force according to the judgment result.
In the embodiment of the present invention, when the critical lateral force of the threaded connection is determined by simulation, a threaded connection model is first created, and the specific model can be determined according to actual requirements, and the threaded connection model (as shown in fig. 2) including only the bolt model 201, the nut model 202 and the movable plate model 203 is selected for description. After the threaded connection model is established, periodically applying a first transverse force to the movable plate model 203 in a preset direction for accelerating the stress redistribution of the threaded connection, determining that the stress redistribution is completed when the application period of the first transverse force reaches a first preset number, periodically applying a second transverse force in the preset direction again for testing, and acquiring the testing pretightening force of each period; and when the application period of the second transverse force reaches a second preset number, determining that the test at the current stage is finished, determining a judgment result whether the threaded connection model is loosened under the current condition according to the obtained test pretightening force, and finally determining the critical transverse force of the threaded connection model according to the judgment result. According to the technical scheme, the first transverse force is periodically applied to the movable plate model 203, and the influence of the stress redistribution pair test is fully considered, so that the threaded connection model finishes stress redistribution when the test is formally carried out, and the accuracy of the test pretightening force and the final critical transverse force in the subsequent test process is further ensured. The second beam force is the first candidate in the preset transverse force arithmetic sequence, so that the whole simulation determination method has good logic, and technicians can determine the value of each option in the transverse force arithmetic sequence according to requirements. Meanwhile, compared with the physical test, the simulation test reduces the cost and improves the test efficiency.
Preferably, in the method for determining the critical transverse force of the threaded connection, when the row of the equal difference of the transverse forces is a descending row, the step of determining the critical transverse force according to the judgment result includes:
if the threaded connection model is determined to be loosened, updating the second transverse force to be an option in the transverse force arithmetic progression, initializing the threaded connection model, and returning to the step of applying a first transverse force of a first preset period to the movable plate in a preset direction;
and if the threaded connection model is determined not to be loosened, determining the second transverse force as a critical transverse force.
In the embodiment of the invention, when the transverse force arithmetic progression is a decreasing progression, the first item to be tested is the item with the largest value in the items to be tested, at this time, if the threaded connection model is determined to be loosened, the current value of the second transverse force is larger than the value of the critical transverse force, and the critical transverse force cannot be determined, at this time, the second transverse force is updated to the selected item, and the steps are executed again after the threaded connection model is initialized, so that the whole testing process is sequentially carried out according to the preset transverse force arithmetic progression until the second transverse force is determined to be the critical transverse force when the threaded connection model is not loosened. The logic of the whole process is ensured while the accurate critical transverse force is ensured.
Alternatively, in the method for determining the critical transverse force of the threaded connection, when the row of the equal difference of the transverse forces is an increasing row, the step of determining the critical transverse force according to the judgment result includes:
if the threaded connection model is determined not to be loosened, updating the second transverse force to be an option in the transverse force arithmetic progression, initializing the threaded connection model, and returning to execute the step of applying a first transverse force of a first preset period to the movable plate in the preset direction;
and if the threaded connection model is determined to be loosened, determining the transverse force corresponding to the selected item adjacent to the second transverse force in the transverse force equal difference array as a critical transverse force.
In the embodiment of the invention, when the transverse force arithmetic progression is an incremental progression, the first item to be tested is the item with the minimum value in the items to be tested, at this time, if the threaded connection model is determined not to be loosened, the current value of the second transverse force is smaller than the critical transverse force value, and the critical transverse force cannot be determined, at this time, the second transverse force is updated to the selected item, and the steps are executed again after the threaded connection model is initialized, so that the whole testing process is sequentially carried out according to the preset transverse force arithmetic progression until the current value of the second transverse force is determined to be larger than the critical transverse force value when the threaded connection model is loosened. In order to ensure the effectiveness of the critical transverse force, the transverse force corresponding to the selected item adjacent to the second transverse force is determined as the critical transverse force in the transverse force arithmetic progression. The logic of the whole process is ensured while the accurate critical transverse force is ensured.
Referring to fig. 3, preferably, in the method for determining the critical lateral force of threaded connection, the step of determining whether the threaded connection model is loose according to the test pretension force of each cycle includes:
step S301, dividing the test pretightening force of each period into a plurality of regions according to the period sequence, wherein each region comprises a third preset number of periods;
step S302, obtaining the pretightening force change rate of each area according to the first test pretightening force and the last test pretightening force of each area;
step S303, determining a region with the pretightening force change rate within a preset range as a target region, and determining that the threaded connection model is loosened when the number of the target region which is continuous in the period sequence is greater than a first threshold value; otherwise, determining that the threaded connection model is not loosened.
In the embodiment of the invention, when judging whether the threaded connection model is loosened according to the test pretightening force of each period, firstly, dividing the test pretightening force of each period into a plurality of regions according to the period sequence, wherein each region comprises the same number of periods, obtaining the pretightening force change rate of each region according to the first test pretightening force and the last test pretightening force of each region, namely judging the change trend of the pretightening force in each region, when the pretightening force change rate is in a preset range, determining that the pretightening force is in a reduction trend, wherein the preset range is preferably a value range smaller than zero in the invention, in the actual test, a worker can specifically set other ranges, when the continuous number of the regions in the reduction trend is larger than a first threshold, indicating that the pretightening force of the threaded connection model is always reduced at the moment, namely determining that the threaded, and if the continuous quantity is smaller than the first threshold value, judging as an accidental error, and determining that the threaded connection model is not loosened. The method is favorable for avoiding the situation of judgment error caused by accidental errors, and further is favorable for ensuring the accuracy of the finally obtained critical transverse force.
Referring to fig. 4, in particular, the method for determining a critical transverse force of a threaded connection as described above, after the step of creating a threaded connection model, the method further comprises:
step S401, acquiring the end face contact friction coefficient of the nut model and the movable plate model;
step S402, obtaining end face contact friction according to a preset pretightening force and an end face contact friction coefficient;
step S403, a first transverse force is obtained according to the end surface contact friction force and a preset first ratio.
In the embodiment of the invention, after the threaded connection model is established, the end surface contact friction coefficient is determined according to the material and other factors of the nut model and the movable plate model, the end surface contact friction coefficient is multiplied by the preset pretightening force to obtain the end surface contact friction force, the first transverse force can be determined according to the end surface friction force and the preset first ratio, and the first transverse force is determined according to the standard of the end surface contact friction force, so that the better acceleration stress redistribution process is facilitated, wherein the first ratio is preferably ninety percent.
Further, the method for determining the critical transverse force of the threaded connection as described above further includes: and obtaining a transverse force equal difference series according to the end face contact friction force and a preset proportion equal difference series, wherein the tolerance in the proportion equal difference series is a preset proportion.
In the embodiment of the invention, the preset equal difference sequence of the transverse force is obtained according to the end surface contact friction force and the preset equal difference sequence of the proportion, and the tolerance in the equal difference sequence of the proportion is a preset proportion, so that the second transverse force is also determined according to the standard of the end surface contact friction force, the phenomenon that when the preset pretightening force is larger or smaller, the difference between the values of two adjacent terms in the equal difference sequence of the transverse force is too large or the number of the terms is too small is avoided, and the accuracy of the finally determined critical transverse force is ensured.
Specifically, in the method for determining the critical transverse force of the threaded connection as described above, the first transverse force is greater than or equal to the second transverse force.
In the embodiment of the invention, the first transverse force is greater than or equal to the second transverse force, so that unnecessary tests due to overlarge transverse force are avoided while acceleration stress redistribution is ensured, and the test efficiency is improved.
Preferably, in the method for determining the critical transverse force of a threaded connection as described above, the second predetermined number is greater than the first predetermined number.
In the embodiment of the invention, the second preset number is larger than the first preset number, so that the abrasion of the threaded connection model caused by overlong application time of the first transverse force is avoided, the testing time in formal testing is longer, and the testing accuracy is favorably ensured.
Referring to fig. 5, still another preferred embodiment of the present invention also provides a device for determining a critical lateral force of a threaded connection, including:
a first processing module 501 for creating a threaded connection model, the threaded connection model comprising at least: the bolt model penetrates through the movable plate model and is in threaded connection with the nut model through a preset pretightening force;
the second processing module 502 is configured to periodically apply a first transverse force to the movable plate model in a preset direction, where the preset direction is perpendicular to an axial direction of the bolt model;
the third processing module 503 is configured to periodically apply a second lateral force to the movable plate model in the preset direction when the application period of the first lateral force reaches a first preset number, and obtain a test pre-tightening force of each period, where the second lateral force is a first candidate in a preset equal difference sequence of lateral forces;
and a fourth processing module 504, configured to, when the application period of the second lateral force reaches a second preset number, obtain a determination result whether the threaded connection model is loose according to the test pre-tightening force, and determine a critical lateral force according to the determination result.
Preferably, the device for determining a critical transverse force of a threaded connection as described above, the fourth processing module comprises:
the first processing unit is used for updating the second transverse force to be an option in the transverse force arithmetic progression if the threaded connection model is determined to be loosened, initializing the threaded connection model and returning to the step of applying a first transverse force of a first preset period to the movable plate in the preset direction;
and the second processing unit is used for determining that the second transverse force is a critical transverse force if the threaded connection model is determined not to be loosened.
Optionally, the device for determining a critical lateral force of a threaded connection as described above, the fourth processing module further comprises:
a third processing unit, configured to update the second lateral force to be an option in the row of the lateral force arithmetic progression if it is determined that the threaded connection model is not loosened, initialize the threaded connection model, and return to performing the step of applying the first lateral force to the movable plate for the first preset period in the preset direction;
and the fourth processing unit is used for determining that the transverse force corresponding to the selected item adjacent to the second transverse force in the transverse force arithmetic progression is the critical transverse force if the threaded connection model is determined to be loosened.
Preferably, the device for determining a critical transverse force for a threaded connection as described above, the fourth processing module further comprises:
the fifth processing unit is used for dividing the testing pretightening force of each period into a plurality of regions according to the period sequence, and each region comprises a third preset number of periods;
the sixth processing unit is used for obtaining the pretightening force change rate of each area according to the first test pretightening force and the last test pretightening force of each area;
the seventh processing unit is used for determining that an area with the pretightening force change rate within a preset range is a target area, and determining that the threaded connection model is loosened when the continuous number of the target area in the period sequence is greater than a first threshold value; otherwise, determining that the threaded connection model is not loosened.
In particular, the device for determining the critical transverse force of a threaded connection as described above, further comprising:
the acquiring module is used for acquiring the end face contact friction coefficient of the nut model and the movable plate model;
the fifth processing module is used for obtaining end face contact friction according to a preset pretightening force and an end face contact friction coefficient;
and the sixth processing module is used for obtaining a first transverse force according to the end face contact friction force and a preset first proportion.
The device embodiment of the invention is a device corresponding to the method embodiment, and all implementation means in the method embodiment are applicable to the device embodiment and can achieve the same technical effects.
Another preferred embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method for determining a critical transverse force for a threaded connection as described above.
Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method of determining a critical transverse force for a threaded connection, comprising:
creating a threaded connection model, the threaded connection model comprising at least: the bolt model penetrates through the movable plate model and is in threaded connection with the nut model through a preset pretightening force;
periodically applying a first transverse force to the movable plate model in a preset direction, wherein the preset direction is perpendicular to the axial direction of the bolt model;
when the application period of the first transverse force reaches a first preset number, periodically applying a second transverse force to the movable plate model in the preset direction, and acquiring the test pretightening force of each period, wherein the second transverse force is a first candidate in a preset transverse force arithmetic series;
and when the application period of the second transverse force reaches a second preset number, obtaining a judgment result of whether the threaded connection model is loosened according to the test pretightening force, and determining a critical transverse force according to the judgment result.
2. The method of claim 1, wherein when the row of equal differences in transverse force is a descending row, the step of determining the critical transverse force according to the determination result comprises:
if the threaded connection model is determined to be loosened, updating the second transverse force to be an optional item in the transverse force arithmetic progression, initializing the threaded connection model, and returning to the step of applying the first transverse force to the movable plate for the first preset period in the preset direction;
and if the threaded connection model is determined not to be loosened, determining the second transverse force as the critical transverse force.
3. The method of determining a critical transverse force of a threaded connection according to claim 1, wherein when the row of equal differential transverse force is an increasing row, the step of determining the critical transverse force according to the determination result comprises:
if the threaded connection model is determined not to be loosened, updating the second transverse force to be an optional item in the transverse force arithmetic progression, initializing the threaded connection model, and returning to the step of applying a first transverse force of a first preset period to the movable plate in a preset direction;
and if the threaded connection model is determined to be loosened, determining the transverse force corresponding to the selected item adjacent to the second transverse force in the transverse force arithmetic progression as the critical transverse force.
4. The method of claim 1, wherein the step of determining whether the threaded connection model is loose according to the test pretension force per cycle comprises:
dividing the testing pretightening force of each period into a plurality of regions according to the period sequence, wherein each region comprises a third preset number of periods;
obtaining the pretightening force change rate of each region according to the first test pretightening force and the last test pretightening force of each region;
determining a region with the pretightening force change rate within a preset range as a target region, and determining that the threaded connection model is loosened when the continuous number of the target region in the period sequence is greater than a first threshold value; otherwise, determining that the threaded connection model is not loosened.
5. The method of determining a critical transverse force for a threaded connection of claim 1, wherein after the step of creating a threaded connection model, the method further comprises:
acquiring the end surface contact friction coefficient of the nut model and the movable plate model;
obtaining end face contact friction according to the preset pretightening force and the end face contact friction coefficient;
and obtaining the first transverse force according to the end face contact friction force and a preset first proportion.
6. The method of determining a critical transverse force for a threaded connection of claim 5, further comprising: and obtaining the transverse force arithmetic progression according to the end face contact friction force and a preset proportion arithmetic progression, wherein the tolerance in the proportion arithmetic progression is a preset proportion.
7. The method of determining a critical transverse force for a threaded connection of claim 1, wherein the first transverse force is greater than or equal to the second transverse force.
8. The method of determining a critical transverse force for a threaded connection of claim 1, wherein the second predetermined number is greater than the first predetermined number.
9. A device for determining a critical transverse force for a threaded connection, comprising:
a first processing module for creating a threaded connection model, the threaded connection model comprising at least: the bolt model penetrates through the movable plate model and is in threaded connection with the nut model through a preset pretightening force;
the second processing module is used for periodically applying a first transverse force to the movable plate model in a preset direction, and the preset direction is perpendicular to the axial direction of the bolt model;
the third processing module is used for periodically applying a second transverse force to the movable plate model in the preset direction when the application period of the first transverse force reaches a first preset number, and acquiring the test pretightening force of each period, wherein the second transverse force is a first candidate in a preset transverse force arithmetic sequence;
and the fourth processing module is used for obtaining a judgment result of whether the threaded connection model is loosened or not according to the test pretightening force when the application period of the second transverse force reaches a second preset number, and determining a critical transverse force according to the judgment result.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method for determining a critical transverse force of a threaded connection according to any one of claims 1 to 8.
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