CN111460700A - Structural vibration aging frequency obtaining method based on transfer dissipation correction - Google Patents

Structural vibration aging frequency obtaining method based on transfer dissipation correction Download PDF

Info

Publication number
CN111460700A
CN111460700A CN202010122549.3A CN202010122549A CN111460700A CN 111460700 A CN111460700 A CN 111460700A CN 202010122549 A CN202010122549 A CN 202010122549A CN 111460700 A CN111460700 A CN 111460700A
Authority
CN
China
Prior art keywords
dissipation
effective
frequency
residual stress
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010122549.3A
Other languages
Chinese (zh)
Other versions
CN111460700B (en
Inventor
朱林
邱建春
张守业
杨超
韩清振
王鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yangzhou University
Original Assignee
Yangzhou University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yangzhou University filed Critical Yangzhou University
Priority to CN202010122549.3A priority Critical patent/CN111460700B/en
Publication of CN111460700A publication Critical patent/CN111460700A/en
Application granted granted Critical
Publication of CN111460700B publication Critical patent/CN111460700B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a structural vibration aging frequency obtaining method based on transfer dissipation correction, which comprises the following steps: s1, determining the natural frequency of the structure based on a finite element method; s2, determining a dissipation effective surface based on the welding connection relation; s3, determining the effective distortion rate of the dissipation surface based on the residual stress order; s4, determining the effective natural frequency of the dissipation surface based on the dissipation distortion rate; and S5, calculating the optimal vibration aging frequency based on the transfer dissipation correction. The method is high in detection precision and has important practical significance for accurately acquiring the optimal vibration aging frequency of the structure to be analyzed before the vibration aging process.

Description

Structural vibration aging frequency obtaining method based on transfer dissipation correction
Technical Field
The invention relates to a structural vibration aging frequency detection method, in particular to a structural vibration aging frequency acquisition method based on transfer dissipation correction.
Background
With the rapid development of the industry, the workpiece is affected by various processes and other factors in the manufacturing process, and if the above effects and effects on the component cannot be completely eliminated, part of the effects and effects remain in the component to form residual stress; for example, the welding residual stress is the main cause of the process defects of deformation, cracking and the like of the weldment, and even can completely break the welding seam, particularly the positioning welding seam, so that serious safety accidents are caused. At present, the vibration aging treatment is a method for eliminating the internal residual stress of engineering materials, which is commonly used, and enables a workpiece to generate the maximum amplitude to obtain the maximum dynamic stress and the maximum dynamic energy, so that the residual stress in the workpiece is eliminated more thoroughly, and the workpiece obtains a better size stability effect; in the traditional method, the natural frequency of the whole structure is selected as the optimal excitation frequency, but the vibration aging frequency obtained by the method has certain limitation, and the influence of the connection relation of different welding surfaces on the frequency dissipation process cannot be considered.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a structural vibration aging frequency obtaining method based on transfer dissipation correction.
The technical scheme is as follows: the invention provides a structural vibration aging frequency obtaining method based on transfer dissipation correction, which comprises the following steps:
s1, determining the natural frequency of the structure based on a finite element method;
s2, determining a dissipation effective surface based on the welding connection relation;
s3, determining the effective distortion rate of the dissipation surface based on the residual stress compliance;
s4, determining the effective natural frequency of the dissipation surface based on the dissipation distortion rate;
and S5, calculating the optimal vibration aging frequency based on the transfer dissipation correction.
Further, the method for determining the natural frequency of the S1 structure is as follows: and (3) importing the established structure finite element analysis model into finite element analysis software, then carrying out meshing and boundary constraint condition application on the finite element analysis model, and after the pretreatment is finished, solving the third-order inherent frequency of the structure under the pretreatment condition in a harmonic response module, wherein the third-order inherent frequency is marked as omega.
Further, the determination method of the dissipation effective surface of S2 is as follows: in a structure to be analyzed, counting the flat plate surfaces with at least two welding lines according to the welding connection relation between different flat plate surfaces in the structure, taking the flat plate surfaces as dissipation effective surfaces in the subsequent calculation process, and marking the serial number i of the dissipation effective surfaces, wherein i is 1,2,3.. N; n is the number of dissipative effective faces.
Further, the determination method of the dissipation surface effective distortion rate of S3 is as follows: measuring the residual stress value of each dissipation surface in the structure by using a residual stress testing device according to the dissipation effective surface determined in the S2, and recording the residual stress value of the ith dissipation effective surface as sigmari(ii) a Wherein i is a dissipation surface number, i is 1,2,3.. N; n is the number of dissipation effective surfaces; then calculating the corresponding residual stress cis-position coefficient S of each dissipation surfacei，
Figure BDA0002393417190000021
Wherein S isiThe corresponding residual stress cis-position coefficient of each dissipation surface; sigmariThe residual stress value of the ith dissipation effective surface is i 1,2,3.. N; n is the number of dissipation effective surfaces; a is the minimum length of the residual stress intake surface, and the value is 0.1mm-1 mm; c (sigma)ri)maxThe maximum value of the residual stress values of all the dissipation surfaces; c (sigma)ri)minThe minimum value of the residual stress values of all the dissipation surfaces;
then calculating the orthostatic distortion rate J of each dissipative surfacei，
Figure BDA0002393417190000022
Wherein, JiThe orthostatic distortion rate of each dissipative surface; siThe corresponding residual stress cis-position coefficient of each dissipation surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (S)i)maxThe maximum value of the residual stress cis-position coefficients corresponding to all the dissipation surfaces is obtained; c (S)i)minThe minimum value of the residual stress compliance coefficients corresponding to all the dissipative surfaces.
Further, the determination method of the effective natural frequency of the dissipation surface of S4 is as follows: according to the dissipation effective surfaces determined in the S2, importing the flat finite element analysis model of each single dissipation effective surface into finite element analysis software, then carrying out mesh division and boundary constraint condition application on the flat finite element analysis model, after the pretreatment is finished, solving the inherent frequency of the third order in a mode module, and marking the inherent frequency as Hi(ii) a Wherein i is a dissipation surface number, i is 1,2,3.. N; n is the number of dissipation effective surfaces; then the orthotopic distortion rate J calculated in S3iH obtained from finite element analysis softwareiSubstituting the natural frequency correction value T into the following formula to solve the dissipation surface natural frequency correction value T based on the dissipation distortion ratei，
Figure BDA0002393417190000023
Wherein, TiA dissipation surface natural frequency correction value based on the dissipation distortion rate; hiIs the third order natural frequency; j. the design is a squareiThe orthostatic distortion rate of each dissipative surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (H)i)maxIs the maximum value in the third order natural frequency; c (H)i)minIs the minimum value in the third order natural frequency; c (J)i)maxIs the maximum value of the orthostatic distortion rates of all dissipative surfaces; c (J)i)minIs the minimum of the in-order distortion rates of all dissipative surfaces.
Further, the optimal vibration aging frequency calculation method in S5 is as follows: the structure third-order natural frequency omega in S1 and the dissipation surface natural frequency in S4 are corrected to be TiSubstituting the formula into the formula to solve the optimal vibration aging frequency f,
Figure BDA0002393417190000031
Figure BDA0002393417190000032
wherein f is the optimal vibration aging frequency; omega is the third order natural frequency of the structure; t isiCorrecting values for the natural frequency of each dissipative surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (T)i)maxThe maximum value of the corrected values of the natural frequencies of all the dissipation surfaces is obtained; c (T)i)minThe minimum value of the corrected values of the natural frequencies of all the dissipation surfaces is obtained;
Figure BDA0002393417190000033
the corrected value is the average value of all the natural frequencies of the dissipative surface.
In the technical scheme, the finite element analysis software is preferably ANSYS software, the residual stress testing device is preferably an X-ray residual stress testing device, and the minimum length of the residual stress shooting surface is 0.35 mm.
Has the advantages that: the method can effectively consider the influence of the welding connection of the structural part on the dissipation mode, can realize the optimal aging frequency of the vibration of the welding connection structure, and obtains the vibration aging excitation frequency of the structure from the angle based on the transmission dissipation correction, thereby considering the dissipation process between the welding structural surfaces, avoiding the limitation that the traditional method singly excites the vibration through the inherent frequency of the whole structure, and more efficiently and accurately obtaining the optimal excitation frequency of the vibration aging of the structure.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
As shown in fig. 1, the method for obtaining the structural vibration aging frequency based on the transfer dissipation correction of the embodiment includes the following steps:
s1, determining the natural frequency of the structure based on a finite element means:
leading the established structure finite element analysis model into finite element analysis software ANSYS, and then carrying out area analysis on the model with the area of 5cm2After the pretreatment is finished, solving the third-order inherent frequency of the structure under the pretreatment condition in a harmonic response module, wherein the third-order inherent frequency is marked as omega;
s2, determining a dissipation effective surface based on a welding connection relation:
in a structure to be analyzed, according to a welding connection relation between different flat plate surfaces in the structure, counting the flat plate surfaces with at least two welding lines, taking the flat surfaces as dissipation effective surfaces in a subsequent calculation process, and marking the number i of the dissipation effective surfaces, wherein i is 1,2,3. N is the number of dissipation effective surfaces;
s3, determining the effective distortion rate of the dissipation surface based on the residual stress order:
measuring the residual stress value of each dissipation surface in the structure by adopting an X-ray residual stress testing device according to the dissipation effective surface determined in the S2, and recording the residual stress value of the ith dissipation effective surface as sigmari(ii) a Wherein i is a dissipation surface number, i is 1,2,3.. N; n is the number of dissipation effective surfaces;
then calculating the corresponding residual stress cis-position coefficient S of each dissipation surfacei
Figure BDA0002393417190000041
Wherein S isiThe corresponding residual stress cis-position coefficient of each dissipation surface; sigmariThe residual stress value of the ith dissipation effective surface is i 1,2,3.. N; n is the number of dissipation effective surfaces; a is the minimum length of a residual stress intake surface, and is usually 0.1mm-1mm, wherein the value is 0.35 mm; c (sigma)ri)maxThe maximum value of the residual stress values of all the dissipation surfaces; c (sigma)ri)minThe minimum value of the residual stress values of all the dissipation surfaces;
then calculating the orthostatic distortion rate J of each dissipative surfacei
Figure BDA0002393417190000042
Wherein, JiThe orthostatic distortion rate of each dissipative surface; siThe corresponding residual stress cis-position coefficient of each dissipation surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (S)i)maxThe maximum value of the residual stress cis-position coefficients corresponding to all the dissipation surfaces is obtained; c (S)i)minThe minimum value of the residual stress cis-position coefficients corresponding to all the dissipation surfaces is obtained;
s4, determining the effective natural frequency of the dissipation surface based on the dissipation distortion rate:
according to the dissipation effective surfaces determined in the step S2, a flat finite element analysis model of each single dissipation effective surface is imported into finite element analysis software ANSYS, and then the area of the flat finite element analysis model is 5cm2After the pretreatment is finished, the third-order natural frequency is solved in a modal module and marked as Hi(ii) a Wherein i is a dissipation surface number, i is 1,2,3.. N; n is the number of dissipation effective surfaces;
then the orthotopic distortion rate J calculated in S3iH obtained from finite element analysis softwareiSubstituting the natural frequency correction value T into the following formula to solve the dissipation surface natural frequency correction value T based on the dissipation distortion ratei
Figure BDA0002393417190000043
Wherein, TiA dissipation surface natural frequency correction value based on the dissipation distortion rate; hiIs the third order natural frequency; j. the design is a squareiThe orthostatic distortion rate of each dissipative surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (H)i)maxIs the maximum value in the third order natural frequency; c (H)i)minIs the minimum value in the third order natural frequency; c (J)i)maxFor all dissipative surfacesA maximum in the bit distortion rate; c (J)i)minIs the minimum value in the orthostatic distortion rate of all dissipation surfaces;
s5, calculating the optimal vibration aging frequency based on the transmission dissipation correction:
the structure third-order natural frequency omega in S1 and the dissipation surface natural frequency in S4 are corrected to be TiSubstituting the formula to solve the optimal vibration aging frequency f
Figure BDA0002393417190000051
Figure BDA0002393417190000052
Wherein f is the optimal vibration aging frequency; omega is the third order natural frequency of the structure; t isiCorrecting values for the natural frequency of each dissipative surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (T)i)maxThe maximum value of the corrected values of the natural frequencies of all the dissipation surfaces is obtained; c (T)i)minThe minimum value of the corrected values of the natural frequencies of all the dissipation surfaces is obtained;
Figure BDA0002393417190000053
the corrected value is the average value of all the natural frequencies of the dissipative surface.

Claims (6)

1. A structural vibration aging frequency obtaining method based on transfer dissipation correction is characterized in that: the method comprises the following steps:
s1, determining the natural frequency of the structure based on a finite element method;
s2, determining a dissipation effective surface based on the welding connection relation;
s3, determining the effective distortion rate of the dissipation surface based on the residual stress compliance;
s4, determining the effective natural frequency of the dissipation surface based on the dissipation distortion rate;
and S5, calculating the optimal vibration aging frequency based on the transfer dissipation correction.
2. The structural vibration aging frequency acquisition method based on transfer dissipation correction according to claim 1, characterized in that: the method for determining the natural frequency of the S1 structure is as follows: and (3) importing the established structure finite element analysis model into finite element analysis software, then carrying out meshing and boundary constraint condition application on the finite element analysis model, and after the pretreatment is finished, solving the third-order inherent frequency of the structure under the pretreatment condition in a harmonic response module, wherein the third-order inherent frequency is marked as omega.
3. The structural vibration aging frequency acquisition method based on transfer dissipation correction according to claim 2, characterized in that: the determination method of the dissipation effective surface of S2 is as follows: in a structure to be analyzed, counting the flat plate surfaces with at least two welding lines according to the welding connection relation between different flat plate surfaces in the structure, taking the flat plate surfaces as dissipation effective surfaces in the subsequent calculation process, and marking the serial number i of the dissipation effective surfaces, wherein i is 1,2,3.. N; n is the number of dissipative effective faces.
4. The structural vibration aging frequency acquisition method based on transfer dissipation correction according to claim 3, characterized in that: the determination method of the effective distortion rate of the dissipation surface of S3 is as follows: measuring the residual stress value of each dissipation surface in the structure by using a residual stress testing device according to the dissipation effective surface determined in the S2, and recording the residual stress value of the ith dissipation effective surface as sigmari(ii) a Wherein i is a dissipation surface number, i is 1,2,3.. N; n is the number of dissipation effective surfaces; then calculating the corresponding residual stress cis-position coefficient S of each dissipation surfacei，
Figure FDA0002393417180000012
Wherein S isiThe corresponding residual stress cis-position coefficient of each dissipation surface; sigmariThe residual stress value of the ith dissipation effective surface is i 1,2,3.. N; n is the number of dissipation effective surfaces; a is the minimum length of the residual stress intake surfaceThe value is 0.1mm-1 mm; c (sigma)ri)maxThe maximum value of the residual stress values of all the dissipation surfaces; c (sigma)ri)minThe minimum value of the residual stress values of all the dissipation surfaces;
then calculating the orthostatic distortion rate J of each dissipative surfacei，
Figure FDA0002393417180000011
Wherein, JiThe orthostatic distortion rate of each dissipative surface; siThe corresponding residual stress cis-position coefficient of each dissipation surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (S)i)maxThe maximum value of the residual stress cis-position coefficients corresponding to all the dissipation surfaces is obtained; c (S)i)minThe minimum value of the residual stress compliance coefficients corresponding to all the dissipative surfaces.
5. The structural vibration aging frequency acquisition method based on transfer dissipation correction according to claim 4, characterized in that: the determination method of the effective natural frequency of the dissipation surface of S4 is as follows: according to the dissipation effective surfaces determined in the S2, importing the flat finite element analysis model of each single dissipation effective surface into finite element analysis software, then carrying out mesh division and boundary constraint condition application on the flat finite element analysis model, after the pretreatment is finished, solving the inherent frequency of the third order in a mode module, and marking the inherent frequency as Hi(ii) a Wherein i is a dissipation surface number, i is 1,2,3.. N; n is the number of dissipation effective surfaces; then the orthotopic distortion rate J calculated in S3iH obtained from finite element analysis softwareiSubstituting the natural frequency correction value T into the following formula to solve the dissipation surface natural frequency correction value T based on the dissipation distortion ratei，
Figure FDA0002393417180000021
Wherein, TiA dissipation surface natural frequency correction value based on the dissipation distortion rate; hiIs the third order fixedHas a frequency; j. the design is a squareiThe orthostatic distortion rate of each dissipative surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (H)i)maxIs the maximum value in the third order natural frequency; c (H)i)minIs the minimum value in the third order natural frequency; c (J)i)maxIs the maximum value of the orthostatic distortion rates of all dissipative surfaces; c (J)i)minIs the minimum of the in-order distortion rates of all dissipative surfaces.
6. The structural vibration aging frequency acquisition method based on transfer dissipation correction according to claim 5, characterized in that: the optimal vibration aging frequency calculation method in the S5 is as follows: the structure third-order natural frequency omega in S1 and the dissipation surface natural frequency in S4 are corrected to be TiSubstituting the formula into the formula to solve the optimal vibration aging frequency f,
Figure FDA0002393417180000022
Figure FDA0002393417180000023
wherein f is the optimal vibration aging frequency; omega is the third order natural frequency of the structure; t isiCorrecting values for the natural frequency of each dissipative surface; n ═ 1,2, 3.; n is the number of dissipation effective surfaces; c (T)i)maxThe maximum value of the corrected values of the natural frequencies of all the dissipation surfaces is obtained; c (T)i)minThe minimum value of the corrected values of the natural frequencies of all the dissipation surfaces is obtained;
Figure FDA0002393417180000024
the corrected value is the average value of all the natural frequencies of the dissipative surface.
CN202010122549.3A 2020-02-27 2020-02-27 Structure vibration aging frequency acquisition method based on transmission dissipation correction Active CN111460700B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010122549.3A CN111460700B (en) 2020-02-27 2020-02-27 Structure vibration aging frequency acquisition method based on transmission dissipation correction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010122549.3A CN111460700B (en) 2020-02-27 2020-02-27 Structure vibration aging frequency acquisition method based on transmission dissipation correction

Publications (2)

Publication Number Publication Date
CN111460700A true CN111460700A (en) 2020-07-28
CN111460700B CN111460700B (en) 2023-05-23

Family

ID=71684176

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010122549.3A Active CN111460700B (en) 2020-02-27 2020-02-27 Structure vibration aging frequency acquisition method based on transmission dissipation correction

Country Status (1)

Country Link
CN (1) CN111460700B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113177337A (en) * 2021-04-20 2021-07-27 扬州大学 Reed harvester safety evaluation method based on correlation factor characteristic value fluctuation interval

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050242066A1 (en) * 2004-04-29 2005-11-03 Uit. L.L.C. Company Method for modifying or producing materials and joints with specific properties by generating and applying adaptive impulses a normalizing energy thereof and pauses therebetween
CN103464536A (en) * 2013-08-12 2013-12-25 西北工业大学 Vibration stress relief formation method and device under elastic deformation condition
CN105543469A (en) * 2015-12-25 2016-05-04 常州大学 System and method for determining vibration aging excitation frequency
CN105825029A (en) * 2016-04-01 2016-08-03 上海海事大学 Method for optimally designing high-frequency vibration energy amplifying device
CN109182728A (en) * 2018-09-10 2019-01-11 上海海事大学 A kind of green intelligent oscillating aging system and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050242066A1 (en) * 2004-04-29 2005-11-03 Uit. L.L.C. Company Method for modifying or producing materials and joints with specific properties by generating and applying adaptive impulses a normalizing energy thereof and pauses therebetween
CN1985013A (en) * 2004-04-29 2007-06-20 U.I.T.有限责任公司 Method for modifying or producing materials and joints with specific properties by generating and applying adaptive impulses, normalizing energy thereof and pauses therebetween
CN103464536A (en) * 2013-08-12 2013-12-25 西北工业大学 Vibration stress relief formation method and device under elastic deformation condition
CN105543469A (en) * 2015-12-25 2016-05-04 常州大学 System and method for determining vibration aging excitation frequency
CN105825029A (en) * 2016-04-01 2016-08-03 上海海事大学 Method for optimally designing high-frequency vibration energy amplifying device
CN109182728A (en) * 2018-09-10 2019-01-11 上海海事大学 A kind of green intelligent oscillating aging system and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ZHIHUA WU 等: "Nonlinear primary and super-harmonic resonances of functionally graded carbon nanotube reinforced composite beams" *
李俊明 等: "线性弹簧组合式振动时效装置的 3 次超谐共振特性分析" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113177337A (en) * 2021-04-20 2021-07-27 扬州大学 Reed harvester safety evaluation method based on correlation factor characteristic value fluctuation interval
CN113177337B (en) * 2021-04-20 2023-05-26 扬州大学 Reed harvester safety assessment method based on association factor characteristic value fluctuation interval

Also Published As

Publication number Publication date
CN111460700B (en) 2023-05-23

Similar Documents

Publication Publication Date Title
CN111460700A (en) Structural vibration aging frequency obtaining method based on transfer dissipation correction
CN108225547B (en) Method for measuring automobile exhaust noise
WO2017063540A1 (en) Method for calculating hotspot stress at weld toe
CN108362561B (en) Method for determining mechanical properties of materials of welding seam and welding heat affected zone
CN115859746B (en) Deep learning-based copper material additive manufacturing forming precision control method
WO2020252842A1 (en) Design method based on actual load for tooth surface contact spot of gear
CN112199875B (en) Component welding point random vibration fatigue life distribution prediction method based on rain flow method
CN111539142B (en) Pipeline crack propagation driving force calculation method and system
CN112182807A (en) Finite element simulation-based method for analyzing spur gear tooth root crack propagation law
CN108731574B (en) Ship generator set cushion block data measuring device and measuring method thereof
CN1866262A (en) Modeling apparatus and method for capacitor equivalent model
CN103808262B (en) The simulation of multi-hole position holes of products position repairs a die method
CN108387350A (en) Vehicle body attachment point dynamic stiffness test method, device and storage medium
CN113155651B (en) Fatigue test and simulation-based straight gear tooth root crack propagation law analysis method
Park et al. Experimental approach for estimating mesh stiffness in faulty states of rotating gear
CN112307575B (en) Method for checking qualification of composite material wallboard part for judging assembly result
CN111157338B (en) Method for measuring large-strain-range compression hardening curve of metal dumbbell type sample
CN110333148B (en) Soil dynamic shear modulus testing method based on fine analysis of vibration attenuation curve
CN114216674B (en) Gear fatigue test piece and manufacturing method thereof
CN111289392A (en) Metal thin-wall pipe fatigue test device and method based on local polishing
KR20090124355A (en) The method of manufacturing mold for the forging hypoid-gear
CN111241741B (en) Crane wheel rail abrasion monitoring method based on residual stress influence interval correction
CN103981359B (en) A kind of matching method of spectrum harmonics ageing technique exciting force
CN109883896A (en) A kind of aerosol detection method and system
CN114324979B (en) Accelerometer vibration imbalance error assessment method, accelerometer vibration imbalance error assessment device, storage medium and accelerometer vibration imbalance error assessment device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant