CN115758566A - NVH (noise, vibration and harshness) simulation analysis and evaluation method and device for hybrid assembly - Google Patents
NVH (noise, vibration and harshness) simulation analysis and evaluation method and device for hybrid assembly Download PDFInfo
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Abstract
The invention discloses a hybrid assembly NVH simulation analysis and evaluation method, which comprises the steps of establishing a piston kinematics simulation model, inputting a combustion analysis result into the model by taking the combustion analysis result as an in-sum excitation, and obtaining a piston kinematics result; establishing a timing chain kinematic simulation model to simulate the motion of a timing system; establishing a valve system kinematic model, and considering the contribution of valve seating force to vibration noise; establishing a part model and carrying the part model as a finite element model of the whole machine, and realizing 3D finite element meshing; and (4) inputting the result of the kinematic model into a finite element model of the whole machine as excitation, establishing a sound radiation model of the whole machine, and predicting the noise radiation level of the whole machine under the simulated excitation force. The invention can accurately predict the noise radiation level of the whole machine on the premise of only early design parameters and digital-analog. Compared with the noise test after the model machine is out, the method has more prospective and predictive judgment performance and can effectively control the NVH of the hybrid assembly.
Description
Technical Field
The invention relates to the technical field of NVH, in particular to a mixed motion assembly NVH simulation analysis evaluation method and device.
Background
Generally, in a novel hybrid assembly development project, due to the fact that many data are not clear and unlocked, a traditional NVH analysis method of the hybrid assembly generally carries out modeling analysis on a gas distribution assembly, a crankshaft assembly, a piston assembly and a cylinder cover respectively, and most of the gas distribution assemblies adopt a single valve train model for analysis. The method has the advantages of simple model, relatively less required data and short modeling and operation time. The method has the defect that the NVH performance problem caused by the change of an engine structure and parts cannot be found in the early stage in the platform hybrid assembly modification development project, so that the problem solving efficiency in the later stage is low. At present, the evaluation of the hybrid assembly mainly depends on the later-stage test, so that the NVH problem can not be effectively traced when occurring in the later stage, and more cost can be consumed for optimization. The hybrid assembly is an excitation source of the vibration of the whole vehicle, and how to reasonably predict and evaluate the NVH level of the hybrid assembly in the early development stage becomes the focus of attention of various large host factories.
In the face of increasingly violent automobile industry competition, many enterprises develop platform construction in many times to shorten project development period and reduce research and development cost. The hybrid assembly platform modification is an important part in automobile platform, and is particularly important on how to shorten the development cycle while ensuring the product performance and reliability. The NVH analysis of the automobile hybrid-motion assembly is an important content of the development of the hybrid-motion assembly, is externally shown as a process of analyzing and solving noise, vibration and irregularity of an automobile, and is included in a strategy of searching balance points among the performance, quality and cost of the automobile hybrid-motion assembly. Therefore, how to construct the whole hybrid assembly NVH analysis system becomes an important breakthrough point which needs to be considered in the modern automobile platform hybrid assembly retrofit project NVH analysis.
Based on the property of hybrid assembly platformization, in the modification development project, only the peripheral structure and the components are required to be changed without weakening the dynamic performance of the hybrid assembly and changing the components of the body. Therefore, the mixed motion assembly NVH simulation analysis in the platform-based mixed motion assembly retrofit development project should construct a different idea and method from the traditional NVH simulation analysis. The method can simulate the NVH problem caused by the change of the structure and the parts of the hybrid assembly on the premise of ensuring the dynamic performance of the hybrid assembly, and provides an effective solution.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or other problems with the prior art hybrid assembly.
Therefore, the problem to be solved by the present invention is how to provide a NVH simulation analysis and evaluation method that can participate in the early stage of hybrid assembly development.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for analyzing and evaluating NVH simulation of a hybrid dynamic assembly, which includes,
establishing a piston kinematics simulation model through piston kinematics analysis, inputting a combustion analysis result serving as an on-sum excitation into the piston kinematics simulation model, and acquiring a piston kinematics result;
establishing a timing chain kinematic simulation model through timing system analysis, and acquiring a timing chain kinematic result through simulating the motion of a timing system;
establishing a valve system kinematic model through valve system kinematic analysis, and acquiring a valve system kinematic result through valve system kinematic simulation;
establishing a part model and carrying the part model as a finite element model of the whole machine, and realizing 3D finite element meshing;
and taking the piston kinematics result, the timing chain kinematics result and the valve system kinematics result as excitation, inputting the excitation into the complete machine finite element model, establishing a complete machine sound radiation model, and predicting the noise radiation level of the complete machine under the simulated excitation force.
As a preferred scheme of the mixed motion assembly NVH simulation analysis and evaluation method, the method comprises the following steps: the specific steps for obtaining the result of the piston kinematics comprise,
establishing a piston finite element model through piston kinematic analysis;
partitioning the piston, and directly performing 3D entity finite element meshing on the piston;
the piston dynamics simulation is realized by applying the cylinder internal explosion force obtained by early combustion analysis to the piston as the excitation force of the piston motion;
and obtaining a piston temperature field result and a piston kinematics result, and outputting the results to the crankshaft kinematics analysis.
As a preferred scheme of the mixed motion assembly NVH simulation analysis and evaluation method, the method comprises the following steps: the specific steps of obtaining the kinematic results of the timing chain include,
the timing chain is driven to rotate through the crankshaft motion in the crankshaft kinematics;
the motion of the timing chain is used as input to complete the construction of a timing system kinematic simulation model;
3D entity finite element meshing is carried out on the accessory;
timing chain kinematic results are obtained.
As a preferred scheme of the mixed motion assembly NVH simulation analysis and evaluation method, the method comprises the following steps: the specific steps for obtaining the kinematic result of the valve train comprise,
considering the contribution of the valve seating force to vibration noise, establishing a valve system kinematic model;
obtaining valve system excitation through valve system kinematics simulation, and inputting the valve system excitation into the valve system kinematics model;
and obtaining a valve system kinematic result.
As a preferred scheme of the mixed motion assembly NVH simulation analysis and evaluation method, the method comprises the following steps: the mesh division includes: and (4) importing the model into finite element analysis preprocessing software for region division.
As a preferred scheme of the mixed motion assembly NVH simulation analysis and evaluation method, the method comprises the following steps: the predicting the noise radiation level of the complete machine under the simulated excitation force comprises the following steps,
carrying out grid division on the parts and carrying out modal calculation;
the modal calculation result is aligned with a modal result obtained by actual test;
and if the simulation result error is within 5%, determining that the part modal calculation result is accurate, and realizing model checking.
As a preferred scheme of the mixed motion assembly NVH simulation analysis and evaluation method, the method comprises the following steps: the predicting the noise radiation level of the complete machine under the simulated excitation force further comprises,
combining the finite element models of all key parts, and carrying out the finite element model of the whole machine;
carrying out grid division on the whole machine, and carrying out modal calculation;
the modal calculation result is aligned with a modal result obtained by actual test;
if the error is within 10%, the overall modal calculation result is considered to be accurate, and model checking is realized.
As a preferred scheme of the mixed motion assembly NVH simulation analysis and evaluation method, the method comprises the following steps: the noise radiation level of the whole machine under the simulated excitation force is predicted, a field point network is established according to the ISO standard, the sound pressure level is simulated when a prototype is calibrated and is not formed, and the vibration noise level of the whole machine is evaluated.
In a second aspect, an embodiment of the present invention provides a hybrid assembly NVH simulation analysis and evaluation system, which is based on the hybrid assembly NVH simulation analysis and evaluation method described above, and includes,
the piston kinematics simulation model establishing module is used for establishing a piston kinematics simulation model through piston kinematics analysis, inputting a combustion analysis result serving as an on-sum excitation into the piston kinematics simulation model, and acquiring a piston kinematics result;
the timing chain kinematic simulation system comprises a timing chain kinematic simulation module, a timing kinematic simulation module establishing module, a timing chain kinematic simulation module and a timing chain control module, wherein the timing chain kinematic simulation module establishing module is used for establishing a timing chain kinematic simulation model through timing system analysis and acquiring a timing chain kinematic result through simulating the motion of a timing system;
the valve system kinematics simulation model establishing module is used for establishing a valve system kinematics model through valve system kinematics analysis and acquiring a valve system kinematics result through valve system kinematics simulation;
the whole machine finite element model establishing module is used for establishing a part model and carrying the part model as a whole machine finite element model to realize 3D finite element meshing;
and the complete machine sound radiation model establishing module is used for inputting the piston kinematics result, the timing chain kinematics result and the valve system kinematics result as excitation into the complete machine finite element model, establishing a complete machine sound radiation model and predicting the noise radiation level of the complete machine under the simulated excitation force.
In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, where the memory stores a computer program, and where: the processor, when executing the computer program, performs the steps of any of the methods described above.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, wherein: the computer program when executed by a processor implements the steps of any of the above methods.
The invention has the beneficial effects that:
1. the general NVH test can be carried out only when the prototype is manufactured and 40% of calibration is completed, the noise radiation level of the whole machine can be predicted more accurately on the premise that only the parameters and the digital-analog are designed in the early stage, and compared with the noise test carried out after the prototype comes out, the noise radiation level prediction method has the advantages of being more prospective and predictive, and being more capable of effectively controlling the NVH of the hybrid assembly;
2. in the prior art, a single valve system is mostly adopted for simulation analysis, and the invention adopts multi-valve system simulation analysis considering different axial sections of a camshaft; the invention relates to a full-machine integrated NVH simulation analysis of three components, a gear train, a cylinder body and a cylinder cover which are connected with each other, and an air inlet manifold and an air outlet manifold which are attached to the three components, wherein the load transmission among the components and the whole machine integrated NVH simulation analysis due to structure and part change are considered, and most of excitation on an engine is covered by means of piston kinematics, crankshaft kinematics, valve train kinematics and timing kinematics, so that NVH simulation prediction can be closer to the actual level.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor. Wherein:
fig. 1 is a flowchart of a hybrid assembly NVH simulation analysis and evaluation method.
FIG. 2 shows the deformation of different cylinder segments of a camshaft without VVT.
FIG. 3 is a diagram of a multi-valve system simulation analysis model.
Fig. 4 shows the acting force of each cylinder camshaft on the valve lifter.
Fig. 5 shows the impact force of each cylinder valve against the valve seat.
FIG. 6 is a vertical loading of the bearing seats by the camshaft sections.
FIG. 7 is a transverse loading of the bearing blocks by the camshaft segments.
FIG. 8 is an abnormally worn tappet for prototype # 1, fourth cylinder.
FIG. 9 is the optimized tappet force.
FIG. 10 is a tappet without abnormal wear of prototype # 2 fourth cylinder.
FIG. 11 is a NVH integrated simulation analysis model of a hybrid special engine complete machine.
FIG. 12 is a cloud diagram of vibration acceleration of the whole machine before optimization.
Fig. 13 is a cloud diagram of the optimized vibration acceleration of the whole machine.
FIG. 14 illustrates crankshaft front end torsional vibration prior to optimization.
FIG. 15 illustrates optimized crankshaft front end torsional vibration.
Fig. 16 is a sample 1# front end sound pressure power curve.
Fig. 17 is a front-end sound pressure power curve of prototype # 2.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1, a first embodiment of the present invention provides a method for analyzing and evaluating NVH simulation of a hybrid assembly, which can accurately predict a noise radiation level of a complete machine on the premise of only early design parameters and a digital-analog model, and includes the following specific steps:
s101: and establishing a piston kinematics simulation model through piston kinematics analysis, inputting a combustion analysis result serving as an on-state excitation into the piston kinematics simulation model, and acquiring a piston kinematics result.
It should be noted that, in the process of developing the performance of a certain hybrid special engine, firstly, a piston finite element model is established through piston kinematic analysis, a piston is partitioned, and 3D entity finite element meshing is directly performed on the piston.
Wherein the meshing comprises: and (4) importing the piston model into finite element analysis pretreatment software, and dividing the piston in regions. The direct 3D meshing may ensure the accuracy of subsequent piston stress calculations.
Further, cylinder implosion pressure obtained through early combustion analysis is applied to the piston to serve as excitation of piston motion, piston kinematics simulation is achieved, and finally a piston temperature field result and piston kinematics are obtained and output to crankshaft kinematics analysis.
S102: and (3) establishing a timing chain kinematic simulation model through timing system analysis, and acquiring a timing chain kinematic result through simulating the motion of the timing system.
It should be noted that, in the analysis of the timing system, the crankshaft motion in the crankshaft kinematics drives the timing chain to rotate, and the timing chain is used as the input of the timing chain, the modeling of the timing system is performed, the 3D grid division is performed on accessories such as the chain and the guide plate, and the kinematic result of the timing chain is finally simulated.
S103: and establishing a valve system kinematic model through valve system kinematic analysis, and acquiring a valve system kinematic result through valve system kinematic simulation.
It should be noted that, also in the valve train simulation, the valve train exciting force can be obtained by the valve train kinematic simulation.
S104: and establishing a part model and carrying the part model into a complete machine finite element model to realize 3D finite element meshing.
It should be noted that, the special hybrid engine component is meshed at the same time, and modal calculation is performed to match the modal result obtained by the actual test. And if the error of the simulation result is ensured to be within 5%, the part modal calculation result is considered to be accurate, and model checking is realized.
Furthermore, the finite element models of all key parts are combined, the finite element models of the whole machine are carried, the overall finite element models are also aligned with the modal test results of actual tests, the error is within 10%, the overall modal calculation result is considered to be accurate, and model checking is achieved.
S105: and (3) taking the kinematic result of the piston, the kinematic result of the timing chain and the kinematic result of the valve system as excitation, inputting the excitation into a finite element model of the whole machine, establishing a sound radiation model of the whole machine, and predicting the noise radiation level of the whole machine under the simulated excitation force.
It should be noted that excitation of vibration and noise of the whole hybrid assembly mainly comes from vibration and noise generated by operation of four components, namely a combustion system, a gas distribution component, a piston component and a crankshaft component. The performance of the hybrid assembly NVH generally derives from the combined performance of the valve train assembly, the piston assembly, and the crankshaft assembly under the drive of the combustion system. And the three motion assemblies of the air distribution assembly, the piston assembly and the crankshaft assembly also have mutually transmitted loads.
It should be noted that the kinematics models are excited and loaded on the complete machine finite element model, the complete machine sound radiation simulation model is carried, the field point grid is established according to the ISO standard, the function of simulating the sound pressure level of the complete machine when the prototype calibration is not formed is realized, the vibration noise level of the complete machine can be better evaluated, the early prediction is realized, and the change risk caused after the prototype is locked in the later stage is avoided.
Further, this embodiment also provides a mixed movement assembly NVH simulation analysis and evaluation system, including:
the piston kinematics simulation model establishing module 201 is used for establishing a piston kinematics simulation model through piston kinematics analysis, inputting a combustion analysis result serving as an on-state and excitation into the piston kinematics simulation model, and acquiring a piston kinematics result;
the timing kinematic simulation model establishing module 202 is used for establishing a timing chain kinematic simulation model through timing system analysis and acquiring a timing chain kinematic result through simulating the motion of a timing system;
the valve system kinematics simulation model establishing module 203 is used for establishing a valve system kinematics model through valve system kinematics analysis and acquiring a valve system kinematics result through valve system kinematics simulation;
a complete machine finite element model establishing module 204, configured to establish a part model and carry the part model as a complete machine finite element model, so as to implement 3D finite element meshing;
and the whole machine sound radiation model establishing module 205 is used for inputting the piston kinematics result, the timing chain kinematics result and the valve system kinematics result serving as excitation into the whole machine finite element model, establishing a whole machine sound radiation model and predicting the noise radiation level of the whole machine under the simulated excitation force.
The embodiment further provides a computer device, which is suitable for the situation of the hybrid assembly NVH simulation analysis and evaluation method, and includes: a memory and a processor; the memory is used for storing computer executable instructions, and the processor is used for executing the computer executable instructions to realize the NVH simulation analysis and evaluation method of the hybrid assembly provided by the embodiment.
The computer device may be a terminal comprising a processor, a memory, a communication interface, a display screen and an input means connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
The embodiment also provides a storage medium, on which a computer program is stored, and the program is executed by a processor to implement the method for implementing the NVH simulation analysis and evaluation of the hybrid assembly as proposed in the above embodiments.
The storage medium proposed by the present embodiment belongs to the same inventive concept as the data storage method proposed by the above embodiments, and technical details that are not described in detail in the present embodiment can be referred to the above embodiments, and the present embodiment has the same beneficial effects as the above embodiments.
Example 2
Referring to fig. 2 to 17, a second embodiment of the present invention provides a method for analyzing and evaluating NVH simulation of a hybrid assembly, and scientific demonstration is performed through simulation experiments to verify the beneficial effects of the present invention.
Taking a 1.5-liter hybrid special engine platform as an example, the original model cancels DVVT connected with an air inlet and exhaust camshaft, and changes the structure of a chain of a front-end gear train and an air inlet and exhaust manifold. Therefore, the task of NVH integrated simulation analysis of the whole platform hybrid-motion assembly is to simulate the NVH performance problem of the hybrid-motion special engine after the structure and parts of the engine are changed, and provide an effective solution.
For canceling the intake and exhaust camshaft DVVT, the influence is mainly to change the impact force change among the camshaft, the tappet, the valve seat and the bearing, which is caused by the phase change of the valve opening under the action of cylinder pressure; for changing the silent chain of the front-end gear train into the non-silent chain, the influence is mainly to change the driving torque vibration between the gear trains, and the driving torque vibration can be transmitted to the front end of the crankshaft so as to influence the torque vibration of the crankshaft pulley; for the change of the structure of the intake and exhaust manifolds, the deformation of the cylinder body is mainly influenced by the change of the heat distribution, so that the movement of the piston is further influenced, and the movement of the piston in turn influences the vibration and the knocking of the cylinder body.
Under the condition that the rigidity of different axial sections of the camshaft in the length direction and the influence of air intake and exhaust DVVT are eliminated, firstly, abaqus is applied to firstly carry out simulation analysis on the camshaft without VVT to obtain the deformation of the different axial sections of each cylinder of the camshaft, the deformation is converted into the rigidity, and then the rigidity is substituted into a Valdyn model of Ricardo to carry out simulation analysis without the DVVT. And carrying out multi-valve-train modeling simulation analysis on the N15 model to obtain different impact forces of each cylinder valve on the valve seat and loads borne by each cylinder camshaft bearing seat.
As shown in fig. 2 to 8, it can be seen from the results that the acting force of the camshaft to the valve lifter is different for each cylinder, and the lifter stress of the fourth cylinder has exceeded the evaluation index. From the test results of the later prototype # 1 (before optimization), the tappet of the fourth cylinder was indeed subjected to abnormal wear. The impact force of other cylinders on the valve seat and the vertical and horizontal loads of shaft sections of the camshaft on the bearing seat also show different values.
As shown in fig. 9 and 10, on the premise of ensuring the dynamic performance of the hybrid assembly, after the valve profile and the valve spring force are readjusted, the valve profile and the valve spring force are substituted into the multi-valve system model again for simulation analysis, and as a result, the stress of each cylinder tappet is effectively reduced and is lower than an evaluation index value, and the experimental result of the later model machine 2# (after optimization) shows that the fourth cylinder tappet has no abnormal wear. The abnormal abrasion problem caused by the overlarge acting force of the camshaft on the fourth cylinder valve tappet after the DVVT is cancelled is solved. And different impact force of each cylinder valve to the valve seat and stress condition of each bearing seat can be anticipated.
The driving torque vibration of the front-end gear train is transmitted to the crankshaft, and acts on a crankshaft bearing seat on the cylinder body together with the torque vibration of the crankshaft; the heat distribution of the intake and exhaust manifolds also affects the amount of deformation of the cylinder block and cylinder head, which in turn affects the movement of the piston, which in turn affects the vibration and knocking of the cylinder block. Based on the reasons, a complete machine NVH integrated simulation analysis model which integrates an air inlet and exhaust multi-valve system, a front-end gear train, a crankshaft, thermal deformation of a cylinder cover of the cylinder body and a suspension system is established by utilizing Valdyn, fearc and Engdyn software of Ricardo, so that the driving torque of the camshaft is transmitted to the front end of the crankshaft through the front-end gear train and is acted together with the torque of the crankshaft, and the torque vibration of a crankshaft belt pulley is output as a result.
It should be noted that the overall engine NVH evaluation content mainly relates to crankshaft torsional vibration, overall engine vibration, 1 meter sound pressure level/sound power, sound pressure/sound intensity, and the like.
The sound pressure of the whole engine needs to meet the evaluation standards of five surfaces, the sound pressure value condition of each surface is analyzed, the noise frequency distribution and the component size are obtained through a sound pressure curve, a 1/3 octave and a Colormap diagram, the vibration peak frequency component and the corresponding rotating speed of the engine are analyzed, the peak contribution frequency range is found, and therefore the problem of solving the problem of parts is solved.
As shown in fig. 11, in the NVH integration simulation analysis result of the hybrid special-purpose engine, it was found that the middle-lower part of the engine front end cover has a relatively large vibration acceleration around 4200 rpm. The crankshaft assembly simulation analysis result is checked, and the torsional vibration of the crankshaft has small wave peaks when the engine is in the 4200rpm 4 order, and the amplitude of the wave peaks is close to the evaluation index. Therefore, the problem is basically locked, and the parameters of the crankshaft assembly need to be adjusted in turn to reduce the torsional vibration of the front end of the crankshaft, so that the vibration acceleration of the front end cover of the engine under the working condition is reduced. In the later test, prototype # 1 (not optimized) shows a small wave peak in the range of 4100-4300 rpm in the 1 m sound pressure power curve of the test point, and prototype # 2 (optimized) shows a small wave peak in the range of 4100-4300 rpm in the 1 m sound pressure power curve of the test point.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A mixed motion assembly NVH simulation analysis evaluation method is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
establishing a piston kinematics simulation model through piston kinematics analysis, inputting a combustion analysis result serving as an on-sum excitation into the piston kinematics simulation model, and acquiring a piston kinematics result;
establishing a timing chain kinematics simulation model through timing system analysis, and acquiring a timing chain kinematics result through the motion of a simulation timing system;
establishing a valve system kinematic model through valve system kinematic analysis, and acquiring a valve system kinematic result through valve system kinematic simulation;
establishing a part model and carrying the part model as a finite element model of the whole machine, and realizing 3D finite element meshing;
and inputting the kinematic result of the piston, the kinematic result of the timing chain and the kinematic result of the valve system into the complete machine finite element model as excitation, establishing a complete machine sound radiation model, and predicting the noise radiation level of the complete machine under the simulated excitation force.
2. The hybrid-driven assembly NVH simulation analysis and evaluation method of claim 1, wherein: the specific steps for obtaining the result of the piston kinematics comprise,
establishing a piston finite element model through piston kinematic analysis;
partitioning the piston, and directly carrying out 3D entity finite element meshing on the piston;
the piston dynamics simulation is realized by applying the cylinder internal explosion force obtained by early combustion analysis to the piston as the excitation force of the piston motion;
and obtaining a piston temperature field result and a piston kinematics result, and outputting the results to the crankshaft kinematics analysis.
3. The hybrid-driven assembly NVH simulation analysis and evaluation method of claim 2, wherein: the specific step of obtaining the kinematic results of the timing chain comprises,
the timing chain is driven to rotate through the crankshaft motion in the crankshaft kinematics;
the motion of the timing chain is used as input to complete the construction of a timing system kinematic simulation model;
3D entity finite element meshing is carried out on the accessory;
timing chain kinematics results are obtained.
4. The hybrid-driven assembly NVH simulation analysis and evaluation method of claim 3, wherein: the specific steps of obtaining the kinematic results of the valve train include,
considering the contribution of the valve seating force to vibration noise, establishing a valve system kinematic model;
obtaining valve system excitation through valve system kinematics simulation, and inputting the valve system excitation into the valve system kinematics model;
and obtaining a valve system kinematic result.
5. The hybrid-driven assembly NVH simulation analysis and evaluation method of any one of claims 1 to 3, wherein: the mesh division includes: and (4) importing the model into finite element analysis preprocessing software for region division.
6. The hybrid-driven assembly NVH simulation analysis and evaluation method of claim 5, wherein: the noise radiation level of the complete machine under the simulated excitation force is predicted to comprise,
carrying out grid division on the parts and carrying out modal calculation;
the modal calculation result is aligned with a modal result obtained by actual test;
and if the simulation result error is within 5%, determining that the part modal calculation result is accurate, and realizing model checking.
7. The hybrid-driven assembly NVH simulation analysis and evaluation method of claim 6, wherein: the predicting the noise radiation level of the complete machine under the simulated excitation force further comprises,
combining the finite element models of all key parts, and carrying out the finite element model of the whole machine;
carrying out grid division on the whole machine, and carrying out modal calculation;
the modal calculation result is aligned with a modal result obtained by actual test;
if the error is within 10%, the overall modal calculation result is considered to be accurate, and model checking is realized.
8. A mixed motion assembly NVH simulation analysis and evaluation system is based on the mixed motion assembly NVH simulation analysis and evaluation method of claims 1-7, and is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the piston kinematics simulation model establishing module (201) is used for establishing a piston kinematics simulation model through piston kinematics analysis, inputting a combustion analysis result serving as an on-state and excitation into the piston kinematics simulation model, and acquiring a piston kinematics result;
the timing chain kinematics simulation model establishing module (202) is used for establishing a timing chain kinematics simulation model through timing system analysis and acquiring a timing chain kinematics result through simulating the motion of a timing system;
the valve system kinematics simulation model establishing module (203) is used for establishing a valve system kinematics model through valve system kinematics analysis and acquiring a valve system kinematics result through valve system kinematics simulation;
the whole machine finite element model establishing module (204) is used for establishing a part model and carrying the part model as a whole machine finite element model to realize 3D finite element meshing;
and the complete machine sound radiation model establishing module (205) is used for inputting the piston kinematic result, the timing chain kinematic result and the valve system kinematic result into the complete machine finite element model as excitation, establishing a complete machine sound radiation model and predicting the noise radiation level of the complete machine under the simulated excitation force.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that: the processor, when executing the computer program, performs the steps of the method of any of claims 1 to 8.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program when executed by a processor implements the steps of the method of any one of claims 1 to 8.
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