CN118013645A - Method and device for determining service life of silicone oil damper, vehicle and storage medium - Google Patents
Method and device for determining service life of silicone oil damper, vehicle and storage medium Download PDFInfo
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- 229920002545 silicone oil Polymers 0.000 title claims abstract description 267
- 238000000034 method Methods 0.000 title claims abstract description 59
- 230000015556 catabolic process Effects 0.000 claims abstract description 116
- 238000006731 degradation reaction Methods 0.000 claims abstract description 116
- 239000006096 absorbing agent Substances 0.000 claims abstract description 36
- 238000003466 welding Methods 0.000 claims abstract description 27
- 230000035939 shock Effects 0.000 claims abstract description 25
- 238000004590 computer program Methods 0.000 claims description 16
- 238000004088 simulation Methods 0.000 claims description 15
- 238000001228 spectrum Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 10
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- 238000004364 calculation method Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 229920001296 polysiloxane Polymers 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
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- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a method and a device for determining the service life of a silicone oil damper, a vehicle and a storage medium. The method for determining the service life of the silicone oil damper comprises the following steps: acquiring the resonance frequency of an engine crankshaft system after the engine is started and the torsional vibration value of a basic crankshaft system under the set operation working condition of the engine, and determining that the torsional vibration state of the engine crankshaft system is normal; acquiring actual crankshaft torsional vibration amplitude, actual damper temperature and actual damper torque, and determining an actual crankshaft torsional vibration state MAP; respectively obtaining the viscosity degradation rate MAP of the silicone oil of the damper and the stress level MAP of the welding line according to the torsional vibration state MAP of the actual crankshaft, and determining the viscosity degradation rate of the actual damper and the estimated fatigue life of the welding line; a first silicone oil damper life based on silicone oil viscosity degradation and a second silicone oil damper life based on weld fatigue are determined, respectively, and a silicone oil damper predicted life of the silicone oil damper is determined. The invention can accurately predict the fatigue life of the silicone oil shock absorber.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method and a device for determining the service life of a silicone oil damper, a vehicle and a storage medium.
Background
The front end of the crankshaft of the commercial vehicle engine is matched with a torsional vibration damper, so that torsional vibration of the crankshaft is reduced, and the safety of the engine vehicle is ensured. The conventional damper has three forms of rubber, silicone oil and springs, wherein the silicone oil damper is most commonly used, the silicone oil damper is structured as shown in fig. 1, and a certain gap between a sealed damper housing 11 and an inertia ring 12 is filled with silicone oil 13 with certain viscosity. When the engine runs, the crankshaft system generates torsional vibration under the action of in-cylinder pressure, the damper shell 11 rotates synchronously with the crankshaft, the inner ring of the inertia ring 12 and the damper shell 11 do relative motion due to inertia, and the relative motion shears the silicone oil 13 to generate torsional rigidity and damping, so that the torsional vibration energy of the whole crankshaft system is converted into heat of the damper to be emitted, and the effect of damping is achieved.
Currently, there are two main failure modes of silicone dampers: one is that the viscosity of the silicone oil is deteriorated at high temperature, so that the vibration damping performance is reduced until the silicone oil damper cannot effectively damp vibration, so that the torsional vibration overrun of the engine crankshaft system is damaged; and the other is that fatigue fracture occurs at the weak position of the sealed shock absorber shell, and the welding seam of the common shock absorber shell is cracked, so that silicone oil leaks, and the performance of the silicone oil shock absorber is disabled. It can be seen that the failure of the silicone oil damper is a result of the accumulation of silicone oil degradation and weld fatigue, which are significantly affected by the damper load history, and therefore, it is very significant to effectively and accurately predict the life of the silicone oil damper in the face of complex and diverse engine vehicle usage scenarios.
Disclosure of Invention
The invention provides a method, a device, a vehicle and a storage medium for determining the service life of a silicone oil damper, which are used for solving the problem that the failure of the silicone oil damper caused by structural fatigue failure of a damper shell is not considered and the silicone oil damper cannot be suitable for various vehicle operation conditions.
According to an aspect of the present invention, there is provided a silicone oil damper life determining method including:
Acquiring the engine crankshaft system resonant frequency after the engine is started and the basic crankshaft system torsional vibration value under the set operation working condition of the engine, and determining that the engine crankshaft system torsional vibration state is normal according to the engine crankshaft system resonant frequency and the basic crankshaft system torsional vibration value;
When the torsional vibration state of the crankshaft system of the engine is determined to be normal, acquiring an actual crankshaft torsional vibration amplitude, an actual vibration damper temperature and an actual vibration damper torque after the engine stably runs, and determining an actual crankshaft torsional vibration state MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration amplitude, the actual vibration damper temperature and the actual vibration damper torque;
Respectively acquiring a vibration damper silicone oil viscosity degradation rate MAP and a welding seam stress level MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration state MAP, determining the actual vibration damper viscosity degradation rate of the engine according to the vibration damper silicone oil viscosity degradation rate MAP, and determining the welding seam estimated fatigue life according to the welding seam stress level MAP;
And respectively determining a first silicone oil damper life of the silicone oil damper based on the silicone oil viscosity degradation and a second silicone oil damper life based on the weld joint fatigue according to the actual damper viscosity degradation rate and the weld joint estimated fatigue life, and determining a silicone oil damper predicted life of the silicone oil damper according to the first silicone oil damper life and the second silicone oil damper life.
According to another aspect of the present invention, there is provided a silicone oil damper life determining apparatus including:
The state normal determining module is used for executing the acquisition of the engine crankshaft system resonant frequency after the engine is started and the basic crankshaft system torsional vibration value under the set running working condition of the engine, and determining that the engine crankshaft system torsional vibration state is normal according to the engine crankshaft system resonant frequency and the basic crankshaft system torsional vibration value;
the state MAP determining module is used for acquiring the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque after the engine stably runs when the torsional vibration state of the crankshaft of the engine is determined to be normal, and determining the actual crankshaft torsional vibration state MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque;
The fatigue life determining module is used for respectively acquiring a damper silicone oil viscosity degradation rate MAP and a weld stress level MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration state MAP, determining the actual damper viscosity degradation rate of the engine according to the damper silicone oil viscosity degradation rate MAP, and determining the estimated fatigue life of the weld according to the weld stress level MAP;
And a predicted life determining module for executing the determination of a first silicone oil life of the silicone oil damper based on the silicone oil viscosity degradation and a second silicone oil life of the silicone oil damper based on the weld fatigue according to the actual damper viscosity degradation rate and the weld estimated fatigue life, respectively, and determining a silicone oil damper predicted life of the silicone oil damper according to the first silicone oil life and the second silicone oil life.
According to another aspect of the present invention, there is provided a vehicle including:
at least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the silicone oil damper life determining method of any one of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to implement the silicone oil damper life determining method according to any one of the embodiments of the present invention when executed.
According to the technical scheme, the engine crankshaft system resonance frequency after the engine is started and the basic crankshaft system torsional vibration value under the set running working condition of the engine are obtained, and the engine crankshaft system torsional vibration state is determined to be normal according to the engine crankshaft system resonance frequency and the basic crankshaft system torsional vibration value; when the torsional vibration state of the crankshaft system of the engine is determined to be normal, acquiring an actual crankshaft torsional vibration amplitude, an actual vibration damper temperature and an actual vibration damper torque after the engine stably runs, and determining an actual crankshaft torsional vibration state MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration amplitude, the actual vibration damper temperature and the actual vibration damper torque; respectively acquiring a vibration damper silicone oil viscosity degradation rate MAP and a welding seam stress level MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration state MAP, determining the actual vibration damper viscosity degradation rate of the engine according to the vibration damper silicone oil viscosity degradation rate MAP, and determining the welding seam estimated fatigue life according to the welding seam stress level MAP; and respectively determining a first silicone oil damper life of the silicone oil damper based on the silicone oil viscosity degradation and a second silicone oil damper life based on the weld joint fatigue according to the actual damper viscosity degradation rate and the weld joint estimated fatigue life, and determining a silicone oil damper predicted life of the silicone oil damper according to the first silicone oil damper life and the second silicone oil damper life. The invention solves the problem that the prior silicone oil shock absorber fails due to structural fatigue failure of the shock absorber shell and cannot adapt to various vehicle operation conditions, realizes comprehensive consideration of factors affecting the silicone oil shock absorber, predicts the fatigue life of the silicone oil shock absorber more accurately, and simultaneously faces to various engine use scenes.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a conventional silicone oil damper;
fig. 2 is a flowchart of a method for determining the life of a silicone oil damper according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of torsional vibration amplitude of a front end pulley of a crankshaft system of an in-line 6-cylinder engine according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for determining the life of a silicone oil damper according to a second embodiment of the present invention;
FIG. 5 is a schematic structural view of a related sensor of a vehicle arrangement provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of an engine real-time road spectrum provided in accordance with an embodiment of the present invention;
FIG. 7 is a schematic diagram of a silicone oil viscosity degradation rate MAP for a damper under actual engine operating conditions provided in accordance with an embodiment of the present invention;
Fig. 8 is a schematic diagram of a silicone oil viscosity degradation rule of a silicone oil damper according to an embodiment of the present invention;
fig. 9 is a schematic structural view of a silicone oil damper life determining apparatus according to a third embodiment of the present invention;
Fig. 10 is a schematic structural view of a vehicle implementing a silicone oil damper life determining method of an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 2 is a flowchart of a method for determining the life of a silicone oil damper according to an embodiment of the present invention, which is applicable to a case of predicting the life of a silicone oil damper, and the method may be performed by a silicone oil damper life determining device, which may be implemented in hardware and/or software, and the device may be configured in a vehicle such as a commercial vehicle in which a front end of an engine crankshaft is matched with a torsional damper. As shown in fig. 2, the silicone oil damper life determining method includes:
S110, acquiring the engine crankshaft system resonant frequency after the engine is started and the basic crankshaft system torsional vibration value under the set operation working condition of the engine, and determining that the engine crankshaft system torsional vibration state is normal according to the engine crankshaft system resonant frequency and the basic crankshaft system torsional vibration value.
In this embodiment, after the engine is started, the hot car reaches the water temperature and the oil temperature are stable, at this time, the engine is at constant load output, the engine speed is increased from the idle speed to the rated speed, taking the torsional vibration amplitude of the crankshaft in the process of increasing the engine speed from the idle speed to the rated speed as shown in fig. 3 as an example, fig. 3 shows the torsional vibration amplitude of the front end belt pulley of the crankshaft of a certain in-line 6-cylinder engine, the resonance frequency of the engine Qu Zhouji is determined according to the corresponding engine speed when the maximum amplitude of the resonance frequency occurs, and the method for determining the resonance frequency of the crankshaft of the engine specifically comprises:
Wherein P is the resonance frequency of the crankshaft of the engine, and the unit is Hz; v is the characteristic harmonic order; n is the engine speed in r/min.
It is known that the harmonic is a multiple or fraction of a rotation frequency, such as 6000rpm of a certain engine, 100Hz of the rotation frequency, 100Hz of fundamental frequency and 200Hz … … of 2 harmonic, and the engine crankshaft system is subjected to torsional vibration under the excitation of periodic simple harmonic excitation torque according to the schematic diagram of the relation between the engine rotation speed and the angular displacement shown in fig. 3, when the crankshaft system torsional vibration response amplitude caused by a certain excitation harmonic is large, the simple harmonic of the excitation harmonic is marked as a characteristic harmonic, for example, order6 in fig. 3, the corresponding characteristic harmonic v is 6, the condition of the characteristic harmonic amplitude is further determined, the engine rotation speed when the maximum amplitude of the characteristic harmonic appears is found, and the engine crankshaft system resonance frequency is further determined according to the formula.
The engine speed reaching the rated speed may be, but not limited to, selected according to the actual working requirement of the engine, and the present embodiment is not limited in this regard.
On the basis of the above, the maximum value of torsional vibration amplitude in the range of the real-time recorded engine rotating speed is determined as effective amplitude by combining with the information of the vehicle such as the engine torque, the running time and the like which are corresponding to the occurrence of the effective amplitude, a theoretical torsional vibration simulation model is corrected, and the torsional vibration amplitude of a basic crankshaft under the set running working condition of the engine is calculated through the theoretical torsional vibration simulation model.
It will be appreciated that the theoretical torsional vibration simulation model may be, but is not limited to, pre-established by one skilled in the art based on the engine controller, and the specific implementation and form of the theoretical torsional vibration simulation model is not limited in this embodiment.
The engine set operating conditions may be, but are not limited to, any of engine idle, acceleration and deceleration, full load, or gear shift conditions, and the present embodiment is not limited in this regard. In this embodiment, when acquiring real-time engine speed, torque, running time and other vehicle information, an engine real-time road spectrum is obtained, and according to the real-time information, a theoretical torsional vibration simulation model is corrected, so as to calculate a basic crankshaft torsional vibration value under a corresponding set running condition of the engine.
In order to ensure that the engine crankshaft torsional vibration values under each operation condition of the covered engine are obtained, after the theoretical torsional vibration simulation model is corrected by the real-time information obtained under any set operation condition of the engine, the basic crankshaft torsional vibration values under the corresponding set operation condition of the engine can be calculated according to the corrected theoretical torsional vibration simulation model.
Further, whether the resonance frequency of the engine Qu Zhouji is in the set resonance frequency range is judged, meanwhile, whether the torsional amplitude value of the basic crankshaft is lower than the set torsional amplitude value reference limit value under the set working condition of the engine is judged, if the torsional amplitude value of the basic crankshaft is not out of limit, the normal torsional vibration state of the engine is indicated, the silicone damper is not failed, the life prediction of the silicone damper can be carried out at the moment, and if any index is out of limit, whether the silicone damper fails cannot be determined.
The set resonance frequency range and the set torsional amplitude value reference limit value may be, but not limited to, selectively set according to the actual working requirement of the engine, which is not limited in this embodiment.
S120, when the torsional vibration state of the crankshaft of the engine is determined to be normal, acquiring the actual torsional vibration amplitude, the actual vibration damper temperature and the actual vibration damper torque of the crankshaft after the engine is stably operated, and determining the actual torsional vibration state MAP of the crankshaft under the actual operation working condition of the engine according to the actual torsional vibration amplitude, the actual vibration damper temperature and the actual vibration damper torque.
The stable operation of the engine means that the engine reaches stable operation under the actual operation condition after being started, and the specific stable operation condition can be determined according to the actual operation condition of the engine, and the embodiment is not particularly limited.
It can be understood that the theoretical crankshaft torsional vibration state MAP in the theoretical state of the damper is obtained through simulation, and then when the engine crankshaft torsional vibration state is determined to be normal, the theoretical crankshaft torsional vibration state MAP is corrected according to the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque, and the actual crankshaft torsional vibration state MAP under the actual running condition of the engine is obtained.
S130, respectively obtaining a damper silicone oil viscosity degradation rate MAP and a weld stress level MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration state MAP, determining the actual damper viscosity degradation rate of the engine according to the damper silicone oil viscosity degradation rate MAP, and determining the estimated fatigue life of the weld according to the weld stress level MAP.
Specifically, considering the relation between the running state of the silicone oil damper and the viscosity degradation of the silicone oil, the viscosity degradation rate MAP of the silicone oil of the damper under the actual running condition of the engine is obtained according to the torsional vibration state MAP of the actual crankshaft system, further, nonlinear accumulation is carried out by combining the running time history of the engine, and the actual viscosity degradation rate of the damper of the engine can be obtained according to the viscosity degradation rate MAP of the silicone oil of the damper.
And similarly, calculating the nominal stress of the welding seam based on the actual structure of the silicone oil damper, acquiring the stress level MAP of the welding seam under the actual operation condition of the engine according to the torsional vibration state MAP of the actual crankshaft system, and further determining the estimated fatigue life of the welding seam according to the stress level MAP of the welding seam by combining the actual operation condition time history of the engine.
On the basis of the above, the method for obtaining the viscosity degradation rate limit value of the damper of the engine may be as follows: and obtaining a first silicone oil viscosity degradation rate limit value according to a silicone oil degradation test or a durability test of the shock absorber, obtaining a second silicone oil viscosity degradation rate limit value according to torsional vibration and strength simulation calculation of an engine crankshaft, and taking the smaller value of the first silicone oil viscosity degradation rate limit value and the second silicone oil viscosity degradation rate limit value as the shock absorber viscosity degradation rate limit value of the engine. Other existing means may be used for determination, and the present embodiment is not limited in this regard.
And S140, respectively determining a first silicone oil damper life of the silicone oil damper based on the silicone oil viscosity degradation and a second silicone oil damper life of the silicone oil damper based on the weld joint fatigue according to the actual damper viscosity degradation rate and the weld joint estimated fatigue life, and determining a silicone oil damper predicted life of the silicone oil damper according to the first silicone oil damper life and the second silicone oil damper life.
On the basis of the above, according to the difference between the actual damper viscosity degradation rate and the damper viscosity degradation rate limit value, obtaining the first silicone oil damper life of the silicone oil damper based on the silicone oil viscosity degradation; and determining the second silicone oil damper life of the silicone oil damper based on the weld joint fatigue according to the difference between the estimated fatigue life of the weld joint and the remaining life of the damper determined by the real-time road spectrum of the engine.
Further, the predicted life of the silicone oil damper is determined to be smaller in the first silicone oil damper life and the second silicone oil damper life.
According to the technical scheme, the engine crankshaft system resonance frequency after the engine is started and the basic crankshaft system torsional vibration value under the set running working condition of the engine are obtained, and the engine crankshaft system torsional vibration state is determined to be normal according to the engine crankshaft system resonance frequency and the basic crankshaft system torsional vibration value; when the torsional vibration state of the crankshaft system of the engine is determined to be normal, acquiring an actual crankshaft torsional vibration amplitude, an actual vibration damper temperature and an actual vibration damper torque after the engine stably runs, and determining an actual crankshaft torsional vibration state MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration amplitude, the actual vibration damper temperature and the actual vibration damper torque; respectively acquiring a vibration damper silicone oil viscosity degradation rate MAP and a welding seam stress level MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration state MAP, determining the actual vibration damper viscosity degradation rate of the engine according to the vibration damper silicone oil viscosity degradation rate MAP, and determining the welding seam estimated fatigue life according to the welding seam stress level MAP; and respectively determining a first silicone oil damper life of the silicone oil damper based on the silicone oil viscosity degradation and a second silicone oil damper life based on the weld joint fatigue according to the actual damper viscosity degradation rate and the weld joint estimated fatigue life, and determining a silicone oil damper predicted life of the silicone oil damper according to the first silicone oil damper life and the second silicone oil damper life. The invention solves the problem that the prior silicone oil shock absorber fails due to structural fatigue failure of the shock absorber shell and cannot adapt to various vehicle operation conditions, realizes comprehensive consideration of factors affecting the silicone oil shock absorber, predicts the fatigue life of the silicone oil shock absorber more accurately, and simultaneously faces to various engine use scenes.
Example two
Fig. 4 is a flowchart of a method for determining the life of a silicone oil damper according to a second embodiment of the present invention, where an alternative implementation manner is provided based on the foregoing embodiment. As shown in fig. 4, the silicone oil damper life determining method includes:
S210, acquiring the engine crankshaft system resonant frequency after the engine is started and the basic crankshaft system torsional vibration value under the set operation working condition of the engine, and determining that the engine crankshaft system torsional vibration state is normal according to the engine crankshaft system resonant frequency and the basic crankshaft system torsional vibration value.
S220, when the torsional vibration state of the crankshaft system of the engine is normal, acquiring the actual torsional vibration amplitude, the actual vibration damper temperature and the actual vibration damper torque of the crankshaft system after the engine stably runs.
In this embodiment, the real-time road spectrum of the engine may be acquired by the sensors disposed on the vehicle shown in fig. 5, specifically: ① The front end shock absorber or the belt pulley of the engine is provided with a rotating speed signal panel or a signal hole which is matched with a rotating speed sensor arranged on the front end engine body of the engine, so that the rotating speed signal of the front end of the crankshaft system of the engine can be measured in real time, and the signal is transmitted to a torsional vibration processor for analysis, and finally the real-time actual torsional vibration amplitude of the crankshaft system is obtained; ② A temperature sensor can be arranged at the front end of the engine and used for measuring the surface temperature of the silicone oil damper in real time, and the real-time measured surface temperature of the silicone oil damper is the real-time damper temperature in the embodiment; ③ The front end of the engine is also provided with a displacement sensor for measuring the real-time distance between the silicone oil damper and the engine body, and the signal is processed to obtain the axial acceleration of the silicone oil damper relative to the engine body.
It can be understood that the engine control unit shown in fig. 5 can also record information such as engine torque and engine operation time in real time, and in addition, the engine control unit can also cooperate with the real-time road spectrum of the engine and the information obtained in real time to determine the torsional vibration state of the crankshaft of the engine.
S230, obtaining a theoretical crankshaft torsional vibration state MAP under the theoretical state of the damper through simulation.
S240, correcting the theoretical crankshaft torsional vibration state MAP according to the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque to obtain the actual crankshaft torsional vibration state MAP under the actual engine operating condition.
S250, respectively obtaining a damper silicone oil viscosity degradation rate MAP and a weld stress level MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration state MAP, determining the actual damper viscosity degradation rate of the engine according to the damper silicone oil viscosity degradation rate MAP, and determining the estimated fatigue life of the weld according to the weld stress level MAP.
Specifically, the actual running condition of the engine is recorded in real time, the engine is graded according to the rotating speed and the load rate, a certain step length is used for grading, the accumulated running time of each grade is recorded, and finally the actual running road spectrum of the engine is formed, as shown in fig. 6. Further, the relation between the operating state of the silicone oil damper and the viscosity degradation of the silicone oil is an empirical formula summarized in the silicone oil damper durability test: viscosity degradation rate of silicone oil(T temperature, A amplitude, omega resonance frequency, eta 0 nominal viscosity, R 0 inertia ring outer diameter, R i inertia ring inner diameter, B inertia ring thickness, delta clearance and running time T), and the viscosity degradation rate MAP of the damper silicone oil under the actual running condition of the engine can be obtained by combining the FIG. 6 and the actual crankshaft torsional vibration state MAP, and is shown in FIG. 7. Further, the actual damper viscosity degradation rate Tsi of the engine may be determined from the damper silicone oil viscosity degradation rate MAP.
For silicone oil damper shell welds, the nominal stress can be calculated using analytical methods, the calculation formula of which is as follows:
According to the distortion energy density theory, the nominal stress sigma v at the weld is equivalent to the nominal normal stress sigma and the nominal shear stress tau. Wherein σ N and σ M represent nominal tensile stress and nominal bending stress, respectively, τ F and τ T represent nominal shear stress and nominal torsional shear stress, respectively, N and M represent axial forces and bending moments acting on dangerous sections at the weld, respectively, F and T represent shear forces and torques acting on sections at the weld, respectively, a N and W M represent section and bending resistance section modulus at the weld, respectively, and a F and W T represent shear section and torsional section modulus at the weld, respectively.
It will be appreciated that the loads N, M, F and T that create these stresses are cavity internal pressure, shell thermal expansion, silicone absorber dynamic torque, silicone absorber axial acceleration, and that these loads are translated into nominal stresses at the weld by mechanical theory in combination with structural parameters of the silicone absorber shell and weld.
The method for determining the estimated fatigue life of the weld according to the stress level MAP of the weld can adopt the existing rain flow counting method, and mainly comprises the following steps: a. selecting a corresponding welding grade for each joint, such as B, C, D, E, F, F, G, W and the like for 8 grades in total, in consideration of joint geometry, loading direction, possible failure parts, welding forms and the like; b. acquiring a nominal stress course of a welded joint in the running process of an engine; c. compiling a stress spectrum by using a rain flow counting method to obtain the number n i of stress cycles of each stage; d. obtaining a service life value N i corresponding to each stage of stress according to a corresponding S-N curve in the BS7608 standard; e. and finally, calculating the damage sum of the stress at each level according to the linear accumulated damage theory, and estimating the estimated fatigue life N si of the welding line. Other existing methods may be used for estimation, and this embodiment is not limited in any way.
S260, acquiring a viscosity degradation rate limit value of the damper of the engine, and obtaining the service life of the first silicone oil damper based on the viscosity degradation of the silicone oil damper according to the difference value between the actual viscosity degradation rate of the damper and the viscosity degradation rate limit value of the damper.
Wherein the first silicone oil viscosity degradation rate limit value is obtained according to a shock absorber silicone oil degradation test or a shock absorber durability testAnd obtaining a second silicone oil viscosity degradation rate limit value/>, according to engine crankshaft torsional vibration and strength simulation calculationTaking the smaller value of the first silicone oil viscosity degradation rate limit value and the second silicone oil viscosity degradation rate limit value as the vibration damper viscosity degradation rate limit value/>, of the engineOn the basis of the above, according to the theory of nonlinear accumulation of the silicone oil viscosity degradation of the silicone oil damper, the analysis of the silicone oil viscosity degradation rate of the silicone oil damper should be performed a plurality of times, and it is determined which stage of the life cycle the silicone oil damper is in, according to the decay slope of the silicone oil viscosity degradation rate.
As shown in fig. 8, the life cycle of the silicone oil damper can be divided into three stages according to the viscosity degradation tendency of the silicone oil: t1: the initial running-in, the viscosity degradation of the silicone oil is larger in a certain range, and the performance of the silicone oil damper is unstable but the torsional vibration of the crankshaft of the engine is not out of control; t2: stable operation, low degradation rate of the viscosity of the silicone oil for a long time, and stable performance of the silicone oil shock absorber; t3: at the end of the life, the viscosity of the silicone oil rises in a short time, rapidly deteriorates, the carbonization degree of the silicone oil increases, and the silicone oil damper cannot maintain the performance. In this embodiment, the viscosity of the silicone oil at the end of the steady operation of the life cycle T2 is deteriorated as the damper viscosity deterioration rate limit of the engine.
Further, when the silicone oil damper is in the initial running-in T1 stage, the residual life of the silicone oil damper can be judged by adopting a quadratic function, the accuracy is not high, and a proper explanation should be given to a person skilled in the art; when the stable operation T2 stage is entered, the residual life of the shock absorber can be linearly deduced by adopting the degradation rate of the silicone oil shock absorber under the driving mileage of nearly two times, namely the life of the first silicone oil shock absorber of the silicone oil shock absorber based on the viscosity degradation of the silicone oil isTsi is the actual damper viscosity degradation rate.
S270, determining the second silicone oil damper life of the silicone oil damper based on the fatigue of the welding seam according to the difference between the estimated fatigue life of the welding seam and the remaining life of the damper determined by the real-time road spectrum of the engine. Specifically, according to the linear relation between the driving mileage and the fatigue life of the welding seam, the life prediction N weld＝Nsi of the vibration damper based on the fatigue accumulation of the welding seam is obtained, namely the life of the vibration damper is determined by the real-time road spectrum of the engine, wherein the life of the vibration damper determined by the real-time road spectrum of the engine can be determined according to the operation duration in the real-time road spectrum of the engine shown in fig. 6.
S280, determining the predicted life of the silicon oil damper according to the life of the first silicon oil damper and the life of the second silicon oil damper.
Specifically, the predicted life of the silicone oil damper is determined to be smaller in the first silicone oil damper life and the second silicone oil damper life.
According to the technical scheme provided by the embodiment of the application, the actual crankshaft torsional vibration state under the actual operation working condition process of the engine is obtained by adopting the engine operation speed, torque, the torsional vibration amplitude of the silicone oil damper, the temperature of the silicone oil damper and the axial acceleration of the silicone oil damper in real time, and further, the service life influencing factors of the silicone oil damper are fully considered by considering the nonlinear rule of the degradation accumulation of the silicone oil of the damper and the weak position of the shell structure of the damper, namely the fatigue accumulation of a welding line, so that the method can be oriented to complex and changeable engine use scenes.
Example III
Fig. 9 is a schematic structural diagram of a silicone oil damper life determining device according to a third embodiment of the present invention. As shown in fig. 9, the silicone oil damper life determining apparatus includes:
The state normal determining module 310 is configured to perform obtaining an engine crankshaft system resonant frequency after engine starting and a basic crankshaft system torsional vibration value under the set operation condition of the engine, and determine that the engine crankshaft system torsional vibration state is normal according to the engine crankshaft system resonant frequency and the basic crankshaft system torsional vibration value;
A state MAP determining module 320, configured to obtain an actual crankshaft torsional vibration amplitude, an actual damper temperature, and an actual damper torque after the stable operation of the engine when determining that the torsional vibration state of the crankshaft of the engine is normal, and determine an actual crankshaft torsional vibration state MAP under the actual operation condition of the engine according to the actual crankshaft torsional vibration amplitude, the actual damper temperature, and the actual damper torque;
The fatigue life determining module 330 is configured to obtain a damper silicone oil viscosity degradation rate MAP and a weld stress level MAP under the actual engine operating condition according to the actual crankshaft torsional vibration state MAP, determine an actual damper viscosity degradation rate of the engine according to the damper silicone oil viscosity degradation rate MAP, and determine an estimated fatigue life of the weld according to the weld stress level MAP;
A predicted lifetime determination module 340 for performing a determination of a first silicone oil absorber lifetime of a silicone oil absorber based on silicone oil viscosity degradation and a second silicone oil absorber lifetime based on weld fatigue, respectively, based on the actual absorber viscosity degradation rate and the weld estimated fatigue lifetime, and determining a silicone oil absorber predicted lifetime of the silicone oil absorber based on the first silicone oil absorber lifetime and the second silicone oil absorber lifetime.
Optionally, the resonant frequency of the crankshaft of the engine after the engine is started is obtained, which is specifically used for:
And acquiring torsional vibration amplitude of a crankshaft system in a process of increasing the engine speed from idle speed to rated speed after the engine is started, and determining the resonant frequency of the crankshaft system of the engine according to the torsional vibration amplitude of the crankshaft system in the process.
Optionally, the silicone oil damper life determining device further includes:
The theoretical crankshaft torsional vibration state MAP determining module is used for executing the theoretical crankshaft torsional vibration state MAP under the theoretical state of the damper obtained through simulation;
determining an actual crankshaft torsional vibration state MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque, wherein the actual crankshaft torsional vibration state MAP is specifically used for:
And correcting the theoretical crankshaft torsional vibration state MAP according to the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque to obtain the actual crankshaft torsional vibration state MAP under the actual running condition of the engine.
Optionally, the silicone oil damper life determining device further includes:
A limit value acquisition module for performing acquisition of a damper viscosity degradation rate limit value of the engine;
determining a first silicone oil damper life of the silicone oil damper based on silicone oil viscosity degradation according to the actual damper viscosity degradation rate, specifically for:
And obtaining the first silicone oil damper life of the silicone oil damper based on the silicone oil viscosity degradation according to the difference between the actual damper viscosity degradation rate and the damper viscosity degradation rate limit value.
Optionally, the method further comprises obtaining a damper viscosity degradation rate limit of the engine, specifically for:
obtaining a first silicone oil viscosity degradation rate limit value according to a silicone oil degradation test or a durability test of the shock absorber, and obtaining a second silicone oil viscosity degradation rate limit value according to torsional vibration and strength simulation calculation of an engine crankshaft;
And taking the smaller value of the first silicone oil viscosity degradation rate limit and the second silicone oil viscosity degradation rate limit as a vibration damper viscosity degradation rate limit of the engine.
Optionally, determining the second silicone oil damper life of the silicone oil damper based on the fatigue of the weld according to the estimated fatigue life of the weld, and specifically for:
And determining the second silicone oil damper life of the silicone oil damper based on the weld joint fatigue according to the difference between the estimated fatigue life of the weld joint and the remaining life of the damper determined by the real-time road spectrum of the engine.
Optionally, determining a predicted life of the silicone oil damper according to the first silicone oil damper life and the second silicone oil damper life is specifically configured to:
And taking the smaller value of the service life of the first silicone oil damper and the service life of the second silicone oil damper as the predicted service life of the silicone oil damper.
The device for determining the service life of the silicone oil damper provided by the embodiment of the invention can execute the method for determining the service life of the silicone oil damper provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the method for determining the service life of the silicone oil damper.
Example IV
Fig. 10 shows a schematic structural diagram of a vehicle 410 that may be used to implement an embodiment of the invention. Vehicles include digital computers intended to represent various forms, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The vehicle may also include a device representing various forms of mobile devices, such as personal digital assistants, cellular telephones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 10, the vehicle 410 includes at least one processor 411, and a memory, such as a read only memory (ROM 412), a random access memory (RAM 413), etc., communicatively connected to the at least one processor 411, wherein the memory stores computer programs executable by the at least one processor, and the processor 411 can perform various appropriate actions and processes according to the computer programs stored in the read only memory (ROM 412) or the computer programs loaded from the storage unit 418 into the random access memory (RAM 413). In the RAM 413, various programs and data required for the operation of the vehicle 410 may also be stored. The processor 411, the ROM 412, and the RAM 413 are connected to each other through a bus 414. An I/O (input/output) interface 415 is also connected to bus 414.
Various components in the vehicle 410 are connected to the I/O interface 415, including: an input unit 416 such as a keyboard, a mouse, etc.; an output unit 417 such as various types of displays, speakers, and the like; a storage unit 418, such as a magnetic disk, optical disk, or the like; and a communication unit 419 such as a network card, modem, wireless communication transceiver, etc. The communication unit 419 allows the vehicle 410 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.
The processor 411 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 411 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 411 performs the various methods and processes described above, such as the silicone oil damper life determination method.
In some embodiments, the silicone oil damper life determining method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as storage unit 418. In some embodiments, some or all of the computer program may be loaded and/or installed onto the vehicle 410 via the ROM 412 and/or the communication unit 419. When a computer program is loaded into RAM 413 and executed by processor 411, one or more steps of the silicone oil damper life determining method described above may be performed. Alternatively, in other embodiments, the processor 411 may be configured to perform the silicone damper life determination method in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a vehicle having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or a trackball) by which a user can provide input to the vehicle. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A silicone oil damper life determining method, comprising:
Acquiring the engine crankshaft system resonant frequency after the engine is started and the basic crankshaft system torsional vibration value under the set operation working condition of the engine, and determining that the engine crankshaft system torsional vibration state is normal according to the engine crankshaft system resonant frequency and the basic crankshaft system torsional vibration value;
When the torsional vibration state of the crankshaft system of the engine is determined to be normal, acquiring an actual crankshaft torsional vibration amplitude, an actual vibration damper temperature and an actual vibration damper torque after the engine stably runs, and determining an actual crankshaft torsional vibration state MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration amplitude, the actual vibration damper temperature and the actual vibration damper torque;
Respectively acquiring a vibration damper silicone oil viscosity degradation rate MAP and a welding seam stress level MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration state MAP, determining the actual vibration damper viscosity degradation rate of the engine according to the vibration damper silicone oil viscosity degradation rate MAP, and determining the welding seam estimated fatigue life according to the welding seam stress level MAP;
And respectively determining a first silicone oil damper life of the silicone oil damper based on the silicone oil viscosity degradation and a second silicone oil damper life based on the weld joint fatigue according to the actual damper viscosity degradation rate and the weld joint estimated fatigue life, and determining a silicone oil damper predicted life of the silicone oil damper according to the first silicone oil damper life and the second silicone oil damper life.
2. The method of determining a life of a silicone oil damper according to claim 1, wherein acquiring a resonance frequency of an engine crankshaft after an engine start comprises:
And acquiring torsional vibration amplitude of a crankshaft system in a process of increasing the engine speed from idle speed to rated speed after the engine is started, and determining the resonant frequency of the crankshaft system of the engine according to the torsional vibration amplitude of the crankshaft system in the process.
3. The method of determining a life of a silicone oil damper of claim 1, further comprising, prior to determining an actual crankshaft torsional state MAP under actual operating conditions of the engine from the actual crankshaft torsional amplitude, the actual damper temperature, and the actual damper torque:
obtaining a theoretical crankshaft torsional vibration state MAP under the theoretical state of the vibration damper through simulation;
determining an actual crankshaft torsional vibration state MAP under the actual engine operating condition according to the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque, wherein the method comprises the following steps:
And correcting the theoretical crankshaft torsional vibration state MAP according to the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque to obtain the actual crankshaft torsional vibration state MAP under the actual running condition of the engine.
4. The silicone oil damper life determining method according to claim 1, characterized by comprising, after determining an actual damper viscosity degradation rate of the engine from the damper silicone oil viscosity degradation rate MAP:
Acquiring a viscosity degradation rate limit value of a shock absorber of the engine;
determining a first silicone oil damper life of the silicone oil damper based on silicone oil viscosity degradation based on the actual damper viscosity degradation rate, comprising:
And obtaining the first silicone oil damper life of the silicone oil damper based on the silicone oil viscosity degradation according to the difference between the actual damper viscosity degradation rate and the damper viscosity degradation rate limit value.
5. The silicone oil damper life determining method of claim 4, wherein obtaining a damper viscosity degradation rate limit of the engine includes:
obtaining a first silicone oil viscosity degradation rate limit value according to a silicone oil degradation test or a durability test of the shock absorber, and obtaining a second silicone oil viscosity degradation rate limit value according to torsional vibration and strength simulation calculation of an engine crankshaft;
And taking the smaller value of the first silicone oil viscosity degradation rate limit and the second silicone oil viscosity degradation rate limit as a vibration damper viscosity degradation rate limit of the engine.
6. The method of determining a life of a silicone oil damper according to claim 1, wherein determining a second life of the silicone oil damper based on fatigue of the weld from the estimated fatigue life of the weld comprises:
And determining the second silicone oil damper life of the silicone oil damper based on the weld joint fatigue according to the difference between the estimated fatigue life of the weld joint and the remaining life of the damper determined by the real-time road spectrum of the engine.
7. The silicone oil damper life determining method according to claim 1, wherein determining a silicone oil damper predicted life of the silicone oil damper from the first silicone oil damper life and the second silicone oil damper life comprises:
And taking the smaller value of the service life of the first silicone oil damper and the service life of the second silicone oil damper as the predicted service life of the silicone oil damper.
8. A silicone oil damper life determining apparatus, comprising:
The state normal determining module is used for executing the acquisition of the engine crankshaft system resonant frequency after the engine is started and the basic crankshaft system torsional vibration value under the set running working condition of the engine, and determining that the engine crankshaft system torsional vibration state is normal according to the engine crankshaft system resonant frequency and the basic crankshaft system torsional vibration value;
the state MAP determining module is used for acquiring the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque after the engine stably runs when the torsional vibration state of the crankshaft of the engine is determined to be normal, and determining the actual crankshaft torsional vibration state MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration amplitude, the actual damper temperature and the actual damper torque;
The fatigue life determining module is used for respectively acquiring a damper silicone oil viscosity degradation rate MAP and a weld stress level MAP under the actual running condition of the engine according to the actual crankshaft torsional vibration state MAP, determining the actual damper viscosity degradation rate of the engine according to the damper silicone oil viscosity degradation rate MAP, and determining the estimated fatigue life of the weld according to the weld stress level MAP;
And a predicted life determining module for executing the determination of a first silicone oil life of the silicone oil damper based on the silicone oil viscosity degradation and a second silicone oil life of the silicone oil damper based on the weld fatigue according to the actual damper viscosity degradation rate and the weld estimated fatigue life, respectively, and determining a silicone oil damper predicted life of the silicone oil damper according to the first silicone oil life and the second silicone oil life.
9. A vehicle, characterized in that the vehicle comprises:
at least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the silicone oil damper life determining method of any one of claims 1-7.
10. A computer readable storage medium storing computer instructions for causing a processor to implement the silicone oil damper life determining method of any one of claims 1-7 when executed.
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