CN102539160B - Jogging fatigue simulation experiment system of resonant internal combustion engine - Google Patents
Jogging fatigue simulation experiment system of resonant internal combustion engine Download PDFInfo
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- CN102539160B CN102539160B CN201210011887.5A CN201210011887A CN102539160B CN 102539160 B CN102539160 B CN 102539160B CN 201210011887 A CN201210011887 A CN 201210011887A CN 102539160 B CN102539160 B CN 102539160B
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Abstract
The invention relates to a jogging fatigue simulation experiment system of a resonant internal combustion engine, belonging to the technical field of fatigue strength of an internal combustion engine. The jogging fatigue simulation experiment system comprises a jogging fatigue device, an accelerometer, an electronic control component, an electric vibration exciter, a vibration exciter push rod and two inertia vibration plates; and the jogging fatigue device comprises a testing assembly, a pre-tightening bolt, a pressing head, a U-shaped connector, a base, a loading push rod and a load applying shaft. The jogging fatigue simulation experiment system of the resonant internal combustion engine, disclosed by the invention, can be used for researching a problem of jogging fatigue of a structural assembly under the action of a topical characteristic load of an internal combustion engine, and can consider contact of a plane and a plane and carry out a research on a jogging fatigue problem of the testing assembly under the action of different load characteristics and load levels by changing the size of a total load and a proportion relation of a tangent load and a normal load compared with a traditional jogging fatigue simulation experiment.
Description
Technical field
The present invention relates to a kind of jogging fatigue simulation experiment system of resonant internal combustion engine, belong to internal combustion engine fatigue strength technical field.
Background technology
Under internal combustion engine state,, easily there is fretting damage in the acting in conjunction of organism baffle and main beating cap surface of contact bearing pretightening force and alternation normal direction and circumferential load near surface of contact, accelerates the inefficacy of parts.Research shows, under identical alternation external load function, the effect of fretting fatigue can reduce the fatigue lifetime 30%～50% of test specimen.The research of Fretting Fatigue Damage rule becomes the study hotspot in Related Research Domain in recent years gradually.
Experimental study is most important research means in Fretting Fatigue Damage research.Fretting fatigue experiment has various ways, and difference wherein mainly concentrates on pressure head in shape.The shape of pressure head has a variety of, and different pressure heads can cause different stress distribution.Present stage, the most frequently used pressure head had bridge-type pressure head, column type pressure head and spherical indenter etc.Conventionally can provide fixing normal pressure and controlled circulation change muscle power for fatigue criterion test specimen.But this experiment is difficult to the fretting fatigue failure procedure under simulation cycle normal pressure and the acting in conjunction of periodicity tangential force.The dovetail structure jogging fatigue experiment platform of Oxonian Ruiz exploitation, the basis of this experimental system is an electro-hydraulic servo fatigue experimental machine.Simulate respectively centrifugal force and the acting force of air to blade under aeroengine operation status by the excitation of twin shaft disproportional, realize the control of fine motion amplitude by an additional high cycle fatigue excitation.Realize the fretting fatigue experiment of blade construction part.(list of references Ruiz C, Boddington PHB, Chen KC.An investigation on fatigue and fretting in a dovetail joint.Exp Mech1984; 24:208-17.) present stage does not also have relevant paper and the report about the resonance fretting fatigue experimental system of structural member under internal combustion engine characteristic feature load.
Summary of the invention
The object of the invention is, in order fully to simulate the Fretting Fatigue Damage process under engine load feature, to develop a kind of jogging fatigue simulation experiment system of resonant internal combustion engine.
The object of the invention is to be achieved through the following technical solutions.
A kind of jogging fatigue simulation experiment system of resonant internal combustion engine of the present invention, this system comprises fretting fatigue device 1, accelerometer 2, electronic control part 3, electric activator 4, vibrator push rod 5 and two inertia vibration plates 6; Two inertia vibration plates 6 by steel wire hang in orbit; Fretting fatigue device 1 is fixed between two inertia vibration plates 6 by flange; One end of vibrator push rod 5 is fixed on electric activator 4; The other end of vibrator push rod 5 is fixed on an inertia vibration plate 6; Accelerometer 2 is bonded on another piece inertia vibration plate 6 by magnetic force, and its position and vibrator push rod 5 are symmetrical; Electronic control part 3 is for controlling electric activator 4;
Wherein, fretting fatigue device 1 comprises test specimen 7, pretension bolt 8, pressure head 9, U-shaped connector 10, pedestal 11, loaded push lever 12 and load applying axle 13; Pedestal 11 for entirety be a cylinder; Dug two symmetrical grooves at the downside of cylinder, formed a trapezoidal bracing frame between two grooves, the remainder at cylinder two ends is for being fixedly connected with inertia vibration plate 6; Respectively there is a test specimen mounting groove both sides of trapezoidal bracing frame, for fixing and installation test specimen 7, a side of test specimen 7 has a semicircle orifice, and a side of pressure head 9 has a semicircle orifice, pressure head 9 is placed on the upper surface of test specimen 7, and the semicircle orifice of pressure head 9 becomes a circular hole with the semicircle orifice well shaped of test specimen 7; Test specimen 7 and pressure head 9 are fixedly connected on the both sides of trapezoidal bracing frame by pretension bolt 8; The circular hole that load applying axle 13 forms through pressure head 9 and test specimen 7; The two ends of load applying axle 13 are fixed on two arms of U-shaped connector 10; U-shaped connector is fixedly connected with by loaded push lever 12 with pedestal 11.
Can keep the acceleration amplitude on inertia vibration plate 6 constant by closed-loop control, acceleration amplitude is the second derivative of displacement amplitude, there is corresponding relation with the moment of flexure amplitude of test again in displacement amplitude, so also just makes tired moment of flexure amplitude in process of the test keep constant.And connect and occur that when loosening, the bending stiffness of system declines when the fillet place that bent axle list turns test specimen has germinated crackle or tapered sleeve, resonance frequency decreases, control circuit can adjust again excitation frequency with keeping system all the time in resonant condition.
Wherein, mechanical resonant part mainly comprises test specimen, pressure head, jig and load maintainer.Wherein the version of test specimen, pressure head need be similar to the version of organism baffle and main beating cap.Between jig and pressure head, traverse bolt pretightening, for test specimen provides one and the similar working environment of organism baffle.Load maintainer comprises inertia vibration plate, electric activator and push rod three parts.Inertia vibration plate and jig form a tuning fork resonator system, by changing the length of inertia vibration plate, adjust the natural frequency of tuning fork system, and first natural frequency is adjusted near the load frequency of internal combustion engine under in working order.Electric activator by push rod to inertia vibration plate transmitted load, inertia vibration plate by U-shaped push rod by load applying on test specimen and pressure head, realize the fine motion of surface of contact.
Electronic control part can be realized three functions: keep in experimentation load constant, while guaranteeing experiment system all the time in resonant condition, end experiment in good time.
Load in experimentation is constant to be realized by acceleration closed-loop control.When system works, be placed on the electric charge that the accelerometer on vibration plate produces and amplify and convert to after the voltage signal of criterion and quantity through charge amplifier, deliver to servo controller as the response signal of system.Command signal is provided by function generator, delivers to servo controller simultaneously, and its waveform is sinusoidal wave, and frequency equals the resonant frequency of mechanical part, and amplitude is corresponding with required experiment load.Instruction and response signal enter after servo controller, and servo controller compares their amplitude, and export a signal to power amplifier, and excitation electric activator promotes another vibration plate with certain amplitude vibrations.In experimentation, in the time that certain factor changes load, this variation can be corrected automatically by negative feedback in loop, thereby keeps load constant.
Resonance state in experimentation realizes by Frequency servo.In experimentation, test specimen may be loosening etc. former thereby make Stiffness because there is crackle or clamping, and resonant frequency will decrease, and now original resonance state goes to pot.In circuit, designed a resonant frequency tracking cell, its function generator etc. form frequency automatic adjustment circuit for this reason.Command signal and corresponding signal are input to resonance tracking cell, after testing, amplify after feed back to function generator, revision directive signal frequency makes it the resonant frequency current with system and equates, thereby guarantees the resonance state of system.
Test macro is used for measuring the load capacity on fine motion amount and test specimen and pressure head.Measure the displacement fine motion amount between test specimen and pressure head Contact Pair with grating displacement sensor, in fretting fatigue experimentation, the fine motion amount between Contact Pair is in 100 μ m, and therefore, in experimentation, intending selecting resolution is the grating sensor of 0.1 μ m.Be applied to the size of the load on test specimen and pressure head with the U-shaped push rod of force sensor measuring.
This fretting fatigue simulation system can obtain load, fine motion amount and the relation between the life-span.Wherein, load comprises the periodicity acting force of bolt pretightening and load maintainer.Periodically acting force can be broken down into normal force and tangential force along surface of contact direction.By changing the angle between load maintainer and surface of contact, realize the variation of tangential force and normal force ratio.
Simulated experiment realizes by following step:
By the complete machine multi-body Dynamic Analysis under internal combustion engine multi-state, determine tangential force and normal force ratio under internal combustion engine typical condition, on this basis the angle between load maintainer and surface of contact in definite experiment;
Change the output loads of electric activator, be applied to the magnitude of load on test specimen by the U-shaped push rod of force sensor measuring, the pretightning force of this load and jig simulation is superposeed, thereby obtain the output loads of electric activator and the relation of cyclic loading that test specimen bears;
When tangential force and one timing of normal force ratio, change the size of electric activator output loads, measure the fine motion amount of Contact Pair by grating sensor, obtain the curve that fine motion amount changes with electric activator output loads.Can realize the control to fine motion amount by this curve.
Control between pretightning force, tangential force and normal force ratio and the Contact Pair of pretension bolt the parameters such as fine motion amount, carry out Fretting Fatigue Damage experiment, obtain each parameter and the relation between the Fretting Fatigue Damage life-span.
Beneficial effect
Utilize this system can be used for studying the fretting fatigue problem of structural member under internal combustion engine characteristic feature load, compare with traditional fretting fatigue simulated experiment, can consider plane and plane contact, can, by changing the proportionate relationship of gross load size and circumferential load and normal load, carry out the research of the fretting fatigue problem of test specimen under different loads feature and load level effect.The specific works that can carry out comprises:
The output loads of electric activator and test specimen bear the research of rule between cyclic loading;
The control of fine motion amount research between Contact Pair;
The research of the Fretting Fatigue Damage rule under internal combustion engine feature load.
The observation of fine motion crackle and measurement research
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of jogging fatigue simulation experiment system of resonant internal combustion engine;
Fig. 2 is fretting fatigue device structural representation;
The composition schematic diagram of Fig. 3 electronic control part;
Wherein, 1-fretting fatigue device, 2-accelerometer 3-electronic control part, 4-electric activator, 5-vibrator push rod, 6-inertia vibration plate, 7-test specimen, 8-pretension bolt, 9-pressure head, 10-U type connector, 11-pedestal, 12-loaded push lever, 13-load applying axle.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Embodiment
A kind of jogging fatigue simulation experiment system of resonant internal combustion engine, this system comprises fretting fatigue device 1, accelerometer 2, electronic control part 3, electric activator 4, vibrator push rod 5 and two inertia vibration plates 6; Two inertia vibration plates 6 by steel wire hang in orbit; Fretting fatigue device 1 is fixed between two inertia vibration plates 6 by flange; One end of vibrator push rod 5 is fixed on electric activator 4; The other end of vibrator push rod 5 is fixed on an inertia vibration plate 6; Accelerometer 2 is bonded on another piece inertia vibration plate 6 by magnetic force, and its position and vibrator push rod 5 are symmetrical; Electronic control part 3 is for controlling electric activator 4;
Wherein, fretting fatigue device 1 comprises test specimen 7, pretension bolt 8, pressure head 9, U-shaped connector 10, pedestal 11, loaded push lever 12 and load applying axle 13; Pedestal 11 for entirety be a cylinder; Dug two symmetrical grooves at the downside of cylinder, formed a trapezoidal bracing frame between two grooves, the remainder at cylinder two ends is for being fixedly connected with inertia vibration plate 6; Respectively there is a test specimen mounting groove both sides of trapezoidal bracing frame, for fixing and installation test specimen 7, a side of test specimen 7 has a semicircle orifice, and a side of pressure head 9 has a semicircle orifice, pressure head 9 is placed on the upper surface of test specimen 7, and the semicircle orifice of pressure head 9 becomes a circular hole with the semicircle orifice well shaped of test specimen 7; Test specimen 7 and pressure head 9 are fixedly connected on the both sides of trapezoidal bracing frame by pretension bolt 8; The circular hole that load applying axle 13 forms through pressure head 9 and test specimen 7; The two ends of load applying axle 13 are fixed on two arms of U-shaped connector 10; U-shaped connector is fixedly connected with by loaded push lever 12 with pedestal 11.
By the complete machine multi-body Dynamic Analysis under internal combustion engine multi-state, determine tangential force and normal force ratio under internal combustion engine typical condition, angle between load maintainer and surface of contact in definite experiment on this basis, the foundation of inlaying test specimen 7 place's bevel angles as design jig.In order to make this fretting fatigue experimental system can fully simulate the Fretting Fatigue Damage process under engine load feature, must make test specimen 7 and organism baffle critical size meet structural similarity, the two meets material consistance; Pressure head 9 and main beating cap critical size meet mechanism's similarity, and the two meets material consistance.After the size of pressure head 9, test specimen 7, jig and U-shaped push rod is decided, inertia vibration plate 6 is designed.Two identical inertia vibration plates 6 are fixed on jig two ends symmetrically, have formed a tuning fork resonator system.By changing the length of inertia vibration plate 6, adjust the natural frequency of tuning fork system, first natural frequency is adjusted near the load frequency of internal combustion engine under in working order.
The mechanical resonance system manufacturing and designing is mounted to experimental stand.
Utilize output loads size and the frequency of electronic control part control electric activator 4.
Change the output loads of electric activator 4, be applied to the magnitude of load on test specimen 7 and pressure head 9 by the U-shaped push rod of force sensor measuring, the pretightning force of this load and jig simulation is superposeed, thereby obtain the relation of the output loads of electric activator 4 and test specimen 7, pressure head 9 cyclic loading of bearing.
When tangential force and one timing of normal force ratio, change the size of electric activator 4 output loads, measure the fine motion amount of test specimen 7 and pressure head 9 Contact Pair by grating sensor, obtain the curve that this fine motion amount changes with electric activator 4 output loads.Can realize the control to fine motion amount by this curve.
Control between pretightning force, tangential force and normal force ratio and the Contact Pair of pretension bolt 8 parameters such as fine motion amount, carry out Fretting Fatigue Damage experiment, obtain each parameter and the relation between the Fretting Fatigue Damage life-span.
Claims (1)
1. a jogging fatigue simulation experiment system of resonant internal combustion engine, is characterized in that: this system comprises fretting fatigue device (1), accelerometer (2), electronic control part (3), electric activator (4), vibrator push rod (5) and two inertia vibration plates (6); Two inertia vibration plates (6) by steel wire hang in orbit; Fretting fatigue device (1) is fixed between two inertia vibration plates (6) by flange; One end of vibrator push rod (5) is fixed on electric activator (4); The other end of vibrator push rod (5) is fixed on an inertia vibration plate (6); It is upper that accelerometer (2) is bonded at another piece inertia vibration plate (6) by magnetic force, and its position and vibrator push rod (5) are symmetrical; Electronic control part (3) is for controlling electric activator (4);
Fretting fatigue device (1) comprises test specimen (7), pretension bolt (8), pressure head (9), U-shaped connector (10), pedestal (11), loaded push lever (12) and load applying axle (13); Pedestal (11) for entirety be a cylinder; Have two symmetrical grooves at the downside of cylinder, form a trapezoidal bracing frame between two grooves, the remainder at cylinder two ends is for being fixedly connected with inertia vibration plate (6); Respectively there is a test specimen mounting groove both sides of trapezoidal bracing frame, for fixing and installation test specimen (7), one side of test specimen (7) has a semicircle orifice, one side of pressure head (9) has a semicircle orifice, pressure head (9) is placed on the upper surface of test specimen (7), and the semicircle orifice of the semicircle orifice of pressure head (9) and test specimen (7) just in time forms a circular hole; Test specimen (7) and pressure head (9) are fixedly connected on the both sides of trapezoidal bracing frame by pretension bolt (8); Load applying axle (13) is through the circular hole of pressure head (9) and test specimen (7) formation; U-shaped connector (10) is two, two U-shaped connectors (10) symmetry is fixed in two grooves, wherein two arms of U-shaped connector (10) respectively fixed load apply the two ends of axle (13), two U-shaped connectors (10) are fixedly connected with by loaded push lever (12) with pedestal (11) respectively;
In electronic control part (3), signal is inputed to servo controller by signal generator, servo controller sends the sinusoidal pattern command signal of a standard to electric activator (4) by power amplifier, make electric activator (4) evoke system resonance, then the accelerometer (2) being arranged on inertia vibration plate (6) feeds back to servo controller by charge amplifier rear portion as the response signal of system using the acceleration signal recording, a part feeds back to signal generator by syntonic follow unit, and every circulation primary counter accumulates once; Amplitude and the frequency of servo controller to command signal and response signal compares, with revision directive signal or termination test; In electronic control part (3), be also provided with load amplitude restriction and two unit of resonance frequency restriction, in the time that the variation of load amplitude and frequency exceeds the predetermined value of limiting unit, limiting unit can be ended test with protection test device; CYCLIC LOADING number of times when counter can record test termination, records corresponding fatigue lifetime.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109211508A (en) * | 2018-11-09 | 2019-01-15 | 太原科技大学 | One kind being bolted loosening test macro |
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| CN102901838B (en) * | 2012-09-29 | 2014-03-26 | 东北大学 | Non-synchronous vibration simulation experiment table for blades and experiment operation method thereof |
| CN108827804B (en) * | 2018-07-12 | 2021-04-06 | 浙江工业大学 | Dynamic load error online compensation method for resonant fatigue testing machine |
| CN112763198A (en) * | 2020-12-28 | 2021-05-07 | 国营第六一六厂 | Camshaft bending fatigue test device |
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