CN106649990A - Engine main connecting rod load simplifying method applied to rapid fatigue test - Google Patents
Engine main connecting rod load simplifying method applied to rapid fatigue test Download PDFInfo
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- CN106649990A CN106649990A CN201611008285.9A CN201611008285A CN106649990A CN 106649990 A CN106649990 A CN 106649990A CN 201611008285 A CN201611008285 A CN 201611008285A CN 106649990 A CN106649990 A CN 106649990A
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- load
- rod
- master connecting
- fatigue test
- connecting rod
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
Abstract
The invention provides an engine main connecting rod load simplifying method applied to a rapid fatigue test. The method comprises the following steps that 1, the load borne by a main connecting rod during each degree of crank angle within one work cycle is calculated; 2, stress data of the main connecting rod in each degree of crank angle within one work cycle is calculated; 3, the dangerous part of the main connecting rod is determined, two limiting stresses of the dangerous part within one work cycle are acquired, the crank angle generated when the limiting stresses occur and a corresponding limiting work load are obtained; 4, the magnitudes of the simplified two loads are adjusted within a certain range to obtain loads easy to achieve on a rapid fatigue test table; 5, the rapid fatigue test table is designed according to the two simplified loads, and stress data of the dangerous part of the main connecting rod is calibrated. The problem that an engine main connecting rod rapid fatigue test cannot be carried out is solved through a multi-load synthesizing and simplifying method, and the aim of determining the limiting load of the main connecting rod is achieved through the multi-load synthesizing and simplifying method.
Description
Technical field
The invention belongs to engine components rapid fatigue test technical field, more particularly, to one kind rapid fatigue is applied to
The method for simplifying of the engine master connecting-rod load of test.
Background technology
Connecting rod is the key structure part of engine, and its function is that the cylinder pressure for bearing in piston passes to bent axle,
And make the reciprocating motion of piston be changed into the rotary motion of bent axle.Connecting rod as the main stressed member of engine, its tired longevity
Life directly affects the service life of engine, and it is destroyed may cause scrapping for the whole machine of engine, or even entail dangers to user
Safety.
The common connecting rod for being primarily subjected to Tensile or Compressive Loading, the determination of its ultimate load and rapid fatigue test method are very
It is ripe；But, for baroque master connecting-rod, the tension and compression load from correspondence cylinder piston is not only born in the course of work
Lotus, still suffers from the bending load from one or more slave connecting rods, the determination of its ultimate load and the reality of rapid fatigue test
It is now very difficult.
The content of the invention
In view of this, it is contemplated that proposing a kind of simplification of the engine master connecting-rod load for being applied to rapid fatigue test
Method, solve the master connecting-rod of major-minor bar linkage structure pattern engine engine behavior bear load it is sufficiently complex when,
The problem that rapid fatigue test platform cannot be simulated truly completely.
To reach above-mentioned purpose, the technical scheme is that what is be achieved in that：
A kind of method for simplifying of the engine master connecting-rod load for being applied to rapid fatigue test, comprises the steps：
1) according to kinematics and kinetic theory or using kinematics and dynamics calculation software, one, engine is calculated
The load that the master connecting-rod is born in every crank angle degrees in working cycles；
2) simulation analysis software is adopted, according to the load that upper step is obtained, is calculated and is often write music in one working cycles of engine
The stress data of the master connecting-rod under Shaft angle；
3) stress data obtained according to upper step, determines the dangerous position of the master connecting-rod, obtains one work of engine
Two limit stresses of the dangerous position in circulation, and its crank angle and corresponding maximal work load when occurring；
4) load from multiple slave connecting rods that the method equivalent synthesis master connecting-rod of moment of torsion is born such as adopt for 1
Load, will master connecting-rod bear load be reduced to 1 from correspondence cylinder piston load and 1 from multiple slave connecting rods
Load；On the basis of corresponding two limit stresses of master connecting-rod dangerous position are constant, adjust within the specific limits after simplifying
The load that two magnitudes of load are easily achieved for rapid fatigue test platform；
5) according to simplification after two load design rapid fatigue test platforms, and using method for measuring stress demarcate master connecting-rod
The stress data of dangerous position.
Relative to prior art, the present invention has the advantage that：
(1) present invention synthesizes simplified method and solves that the examination of engine master connecting-rod rapid fatigue cannot be carried out by multiple load
The problem tested；
(2) by 2 load values of the equivalent method corrective action on master connecting-rod, load is easy in examination the present invention after adjustment
Test platform realization；
(3) provide a kind of multiple load synthesis simplified method, can be used to solve other structures parts Similar Problems.
Description of the drawings
The accompanying drawing for constituting the part of the present invention is used for providing a further understanding of the present invention, the schematic reality of the present invention
Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the bar linkage structure schematic diagram of radial engine described in the embodiment of the present invention；
The schematic diagram of 9 load that Fig. 2 master connecting-rods described in the embodiment of the present invention bear；
Fig. 3 is primary-secondary link mechanism sketch described in the embodiment of the present invention；
Schematic diagrames of the Fig. 4 by embodiment of the present invention synthesis 2 load that the master connecting-rod bears after simplified.
In Fig. 3：
Connecting rod piston pin center based on A；O is crank up center；B is crank pin center；For throw of crankshaft；α
For crank angle；β is angle between link centerline and cylinder centerline；ω is crank up angular speed；λ is throw of crankshaft and company
Pole length ratio；R is the articulation radii of slave connecting rod place master connecting-rod；AfFor slave connecting rod piston pin center；Connect for secondary
Pole length；γfJoint angle；βfSlave connecting rod pivot angle；Countercylinder centerlines based on γ.
Specific embodiment
It should be noted that in the case where not conflicting, the embodiment and the feature in embodiment in the present invention can phase
Mutually combination.
Below with reference to the accompanying drawings and in conjunction with the embodiments describing the present invention in detail.
The embodiment of the present invention is a kind of method for simplifying of the engine master connecting-rod load for being applied to rapid fatigue test, with such as
As a example by baroque certain radial engine master connecting-rod load simplification process shown in Fig. 1,8 pairs are connected with master connecting-rod even
Bar, in Fig. 1 middle for master connecting-rod, other are slave connecting rod.
Step 1, master connecting-rod bears load in analysis engine behavior, has 9 during per crank angle degrees, respectively
Connect the load of piston and the additional load of 8 slave connecting rods from master connecting-rod；According to kinematics and kinetic theory or employing
Kinematics and dynamics calculation software, are calculated by formula, can be obtained the master connecting-rod in one working cycles of engine and be existed
9 load born during per crank angle degrees；
The following is basic formula：
Master connecting-rod piston acceleration：
A=R ω2cosα+Rω2λcos2α (1)
Slave connecting rod piston acceleration：
af=R ω2(Ecos(af+φ)+Fcos(2af-ξ)) (2)
In formula：
Master connecting-rod microcephaly is along cylinder direction reciprocal inertia force (because the size of reciprocal inertia force is equal to the matter of moving object
The product of amount and its acceleration, its direction is then in opposite direction with acceleration)：
Pj=-mja (3)
Slave connecting rod microcephaly is along cylinder direction reciprocal inertia force：
Pj=-mjaf (4)
Synthesis of the master connecting-rod microcephaly along cylinder direction force：
Synthesis of the slave connecting rod microcephaly along cylinder direction force：
Master connecting-rod is along shaft direction force：
Pc=P/cos β (7)
Power of the slave connecting rod along shaft direction：
Pfc=Pf/cosβf (8)
Slave connecting rod is to the addition bend torque that master connecting-rod is formed：
MB=Pfc*r*sin(β-βf-ψ) (9)
Then master connecting-rod is primarily subjected to power P along shaft directioncAnd 8 addition bend torques M that slave connecting rod is formedBMake a concerted effort
Effect.
Step 2, the load obtained according to upper step and the three-dimensional entity model of master connecting-rod, with simulation analysis software Abaqus
Or Ansys Workbench etc., calculate stress data of the master connecting-rod in a working cycles during every crank angle degrees；
Step 3, according to analysis of fatigue theory or with analysis of fatigue software fatigue etc., walks simulation calculation institute in analysis
The stress data for obtaining, determines the dangerous position of the master connecting-rod, obtains 2 limit stresses of the dangerous position, and its occurs
When crank angle and corresponding 2 maximal work load, the master connecting-rod load corresponding when this limit stress occurs
As ultimate load；
Step 4, with force resolution and blending theory, using etc. moment of torsion the equivalent synthesis master connecting-rod of method born come
Be 1 load from the load of 8 slave connecting rods, will 9 load (1 master 8 is secondary) for bearing of the master connecting-rod be reduced to 2 load (1
Main 1 is secondary), as shown in Figure 2,3；With simulation analysis software Abqus or Ansys Workbench etc., 2 after here synthesis are calculated
The stress data of the master connecting-rod under the effect of individual load, dangerous position do not shift it is constant with its 2 limit stresses on the basis of,
Needs are designed according to rapid fatigue test platform, within the specific limits 2 magnitudes of load after adjustment synthesis；
Step 5, according to adjustment after 2 load, design master connecting-rod rapid fatigue test platform, using electric measuring method measurement lead
The stress value of connecting rod key point in the case where dynamic and static load is made a reservation for, comparative study actual measurement and step 4 calculate gained stress data, by mistake
Difference is not more than claimed range, then the rapid fatigue test platform just can be used to carry out the master connecting-rod rapid fatigue test.
Rationally effectively, the load after synthesis simplifies can be used as engine master connecting-rod rapid fatigue test platform for process of the present invention
Design input condition, realizes master connecting-rod rapid fatigue test.The master connecting-rod for solving major-minor bar linkage structure pattern engine is being sent out
Motivation working condition bear load it is sufficiently complex when, the problem that rapid fatigue test platform cannot be simulated truly completely.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (1)
1. a kind of method for simplifying of the engine master connecting-rod load for being applied to rapid fatigue test, it is characterised in that including following step
Suddenly：
1) according to kinematics and kinetic theory or using kinematics and dynamics calculation software, one work of engine is calculated
The load that the master connecting-rod is born in every crank angle degrees in circulation；
2) simulation analysis software is adopted, according to the load that upper step is obtained, axle of often writing music in one working cycles of engine is calculated and is turned
The stress data of the master connecting-rod under angle；
3) stress data obtained according to upper step, determines the dangerous position of the master connecting-rod, obtains one working cycles of engine
Two limit stresses of the interior dangerous position, and its crank angle and corresponding maximal work load when occurring；
4) load from multiple slave connecting rods that the method equivalent synthesis master connecting-rod of moment of torsion is born such as adopt to be 1 to carry
Lotus, will master connecting-rod bear load be reduced to 1 from correspondence cylinder piston load and 1 load from multiple slave connecting rods
Lotus；On the basis of corresponding two limit stresses of master connecting-rod dangerous position are constant, two after simplifying are adjusted within the specific limits
Individual magnitude of load is the load that rapid fatigue test platform is easily achieved；
5) according to simplification after two load design rapid fatigue test platforms, and it is dangerous to demarcate master connecting-rod using method for measuring stress
The stress data at position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611008285.9A CN106649990A (en) | 2016-11-16 | 2016-11-16 | Engine main connecting rod load simplifying method applied to rapid fatigue test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611008285.9A CN106649990A (en) | 2016-11-16 | 2016-11-16 | Engine main connecting rod load simplifying method applied to rapid fatigue test |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693387A (en) * | 2020-06-15 | 2020-09-22 | 一汽解放汽车有限公司 | Method for determining minimum number of rapid fatigue tests |
| CN116046408A (en) * | 2022-09-09 | 2023-05-02 | 中国航发沈阳发动机研究所 | Loading determination and testing method for fatigue test of turbine rear casing structural parts |
| CN116423527A (en) * | 2023-06-12 | 2023-07-14 | 之江实验室 | Construction method and device of mechanical arm, storage medium and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411772A (en) * | 2013-06-06 | 2013-11-27 | 中国兵器工业集团第七0研究所 | Fatigue test device applied to starlike main connecting rod |
| WO2015025684A1 (en) * | 2013-08-22 | 2015-02-26 | 日産自動車株式会社 | Internal combustion engine |
| CN105388008A (en) * | 2015-12-14 | 2016-03-09 | 中国北方发动机研究所(天津) | Large-bore engine crankshaft asymmetric bending fatigue test method |
-
2016
- 2016-11-16 CN CN201611008285.9A patent/CN106649990A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411772A (en) * | 2013-06-06 | 2013-11-27 | 中国兵器工业集团第七0研究所 | Fatigue test device applied to starlike main connecting rod |
| WO2015025684A1 (en) * | 2013-08-22 | 2015-02-26 | 日産自動車株式会社 | Internal combustion engine |
| CN105388008A (en) * | 2015-12-14 | 2016-03-09 | 中国北方发动机研究所(天津) | Large-bore engine crankshaft asymmetric bending fatigue test method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693387A (en) * | 2020-06-15 | 2020-09-22 | 一汽解放汽车有限公司 | Method for determining minimum number of rapid fatigue tests |
| CN116046408A (en) * | 2022-09-09 | 2023-05-02 | 中国航发沈阳发动机研究所 | Loading determination and testing method for fatigue test of turbine rear casing structural parts |
| CN116423527A (en) * | 2023-06-12 | 2023-07-14 | 之江实验室 | Construction method and device of mechanical arm, storage medium and electronic equipment |
| CN116423527B (en) * | 2023-06-12 | 2023-09-01 | 之江实验室 | Construction method and device of mechanical arm, storage medium and electronic equipment |
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Application publication date: 20170510 |