CN115758566B - NVH simulation analysis and evaluation method and device for hybrid assembly - Google Patents
NVH simulation analysis and evaluation method and device for hybrid assembly Download PDFInfo
- Publication number
- CN115758566B CN115758566B CN202211352540.7A CN202211352540A CN115758566B CN 115758566 B CN115758566 B CN 115758566B CN 202211352540 A CN202211352540 A CN 202211352540A CN 115758566 B CN115758566 B CN 115758566B
- Authority
- CN
- China
- Prior art keywords
- model
- kinematic
- result
- piston
- simulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004088 simulation Methods 0.000 title claims abstract description 97
- 238000004458 analytical method Methods 0.000 title claims abstract description 78
- 238000011156 evaluation Methods 0.000 title claims abstract description 33
- 230000005284 excitation Effects 0.000 claims abstract description 37
- 230000005855 radiation Effects 0.000 claims abstract description 24
- 230000033001 locomotion Effects 0.000 claims abstract description 21
- 238000009838 combustion analysis Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- 238000012821 model calculation Methods 0.000 claims description 3
- 238000000638 solvent extraction Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 5
- 230000000712 assembly Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- LNPDTQAFDNKSHK-UHFFFAOYSA-N valdecoxib Chemical compound CC=1ON=C(C=2C=CC=CC=2)C=1C1=CC=C(S(N)(=O)=O)C=C1 LNPDTQAFDNKSHK-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Testing Of Engines (AREA)
Abstract
The invention discloses a simulation analysis and evaluation method for NVH of a hybrid assembly, which comprises the steps of establishing a piston kinematics simulation model, adopting a combustion analysis result as an excitation, inputting the combustion analysis result into the model, and obtaining the piston kinematics result; establishing a timing chain kinematics simulation model to simulate the movement of a timing system; establishing a valve train kinematic model, and considering the contribution of valve seating force to vibration noise; building a part model and carrying the part model as a complete machine finite element model to realize 3D finite element grid division; and (3) taking the kinematic model result as excitation, inputting the excitation result into a complete machine finite element model, establishing a complete machine acoustic radiation model, and predicting the noise radiation level of the complete machine under the simulated excitation force. The invention can accurately predict the noise radiation level of the whole machine on the premise of only the early design parameters and the digital-analog. Compared with the noise test after waiting for the prototype to come out, the method has the advantages of foresight prejudgement and effective control on NVH of the hybrid assembly.
Description
Technical Field
The invention relates to the technical field of NVH (noise, vibration and harshness), in particular to a simulation analysis and evaluation method and device for NVH of a hybrid assembly.
Background
In general, since many data are not clear and unlocked, the traditional NVH analysis method of the novel hybrid assembly generally models and analyzes 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 system model for analysis. This has the advantage of simple model, relatively few required data, and short modeling and computation times. The defects are that NVH performance problems caused by the change of the engine structure and parts cannot be found in the early stage in the development project of the modification of the platform hybrid assembly, and the problem solving efficiency in the later stage is low. At present, the evaluation of the hybrid assembly mainly depends on a later test, so that the source cannot be traced effectively when the NVH problem occurs in the later stage, and more cost is consumed for optimization. The hybrid assembly is an excitation source of vibration of the whole vehicle, and how to reasonably predict and evaluate NVH level of the hybrid assembly in the early development period becomes a focus of attention of each large host factory.
In the face of the increasingly vigorous competition of automobile industry, a plurality of enterprises develop platform construction in a dispute manner so as to shorten the project development period and reduce the research and development cost. The hybrid assembly platformization modification is an important part in the automobile platformization, and is particularly important how to shorten the development period while ensuring the product performance and reliability. NVH analysis of the automobile hybrid assembly is an important content of development of the hybrid assembly, and is externally expressed as a process of analyzing and solving noise, vibration and harshness of the automobile, and the essence of the NVH analysis is a strategy of searching balance points among performance, quality and cost of the automobile hybrid assembly. Therefore, how to construct a whole NVH analysis system of the hybrid assembly becomes an important breakthrough point to be considered in NVH analysis of a modified project of the modern automobile platform hybrid assembly.
Based on the nature of the hybrid assembly platform, in its retrofit development project, it is required to change only the peripheral structure and parts without weakening the dynamic performance of the hybrid assembly, and without changing the body parts. So the simulation analysis of the NVH of the hybrid assembly in the modified development project of the platform-type hybrid assembly should construct a different thought and method from the traditional simulation analysis of the NVH. The method can simulate NVH problems caused by the change of the structure and 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 intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above and/or problems associated with existing mixing assemblies.
Therefore, the invention aims to provide an NVH simulation analysis and evaluation method which can participate in the early development stage of the hybrid assembly.
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 hybrid assembly NVH simulation analysis and evaluation method, including,
establishing a piston kinematics simulation model through piston kinematics analysis, adopting a combustion analysis result as an excitation, and inputting the combustion analysis result into the piston kinematics simulation model to obtain a piston kinematics result;
the timing chain kinematic simulation model is established through timing system analysis, and a timing chain kinematic result is obtained through simulating the motion of the timing system;
establishing a valve train kinematic model through valve train kinematic analysis, and acquiring a valve train kinematic result through valve train kinematic simulation;
building a part model and carrying the part model as a complete machine finite element model to realize 3D finite element grid division;
and taking the piston kinematics, the timing chain kinematics and the valve train kinematics as excitation, inputting the excitation into the complete machine finite element model, establishing a complete machine acoustic radiation model, and predicting the noise radiation level of the complete machine under the simulation excitation force.
As a preferable scheme of the NVH simulation analysis and evaluation method of the hybrid assembly, the invention comprises the following steps: the specific steps of acquiring the kinematic results of the piston include,
establishing a piston finite element model through piston kinematics analysis;
partitioning the piston, and directly performing 3D entity finite element grid division on the piston;
the in-cylinder explosion force obtained by applying the early combustion analysis to the piston is used as the excitation force of the piston movement, so that the piston dynamics simulation is realized;
and obtaining a piston temperature field result and a piston kinematic result, and outputting the results to crank kinematic analysis.
As a preferable scheme of the NVH simulation analysis and evaluation method of the hybrid assembly, the invention comprises the following steps: the specific steps of obtaining the kinematic result of the timing chain include,
the timing chain is driven to rotate through the motion of a crankshaft in the kinematics of the crankshaft;
taking the motion of the timing chain as input to complete the construction of a kinematic simulation model of the timing system;
performing 3D entity finite element meshing on the accessory;
and obtaining a timing chain kinematic result.
As a preferable scheme of the NVH simulation analysis and evaluation method of the hybrid assembly, the invention comprises the following steps: the specific steps of obtaining the kinematic results of the valve system include,
taking the contribution of valve seating force to vibration noise into consideration, and establishing a valve train kinematic model;
valve train excitation is obtained through valve train kinematic simulation and is input into the valve train kinematic model;
and obtaining the kinematic result of the valve system.
As a preferable scheme of the NVH simulation analysis and evaluation method of the hybrid assembly, the invention comprises the following steps: the meshing includes: and importing the model into finite element analysis preprocessing software to divide the region.
As a preferable scheme of the NVH simulation analysis and evaluation method of the hybrid assembly, the invention comprises the following steps: the predicting the noise radiation level of the complete machine under the simulated excitation force comprises,
dividing grids of the parts and performing modal calculation;
comparing the modal calculation result with a modal result obtained by an actual test;
if the simulation result error is within 5%, the model checking is realized by considering that the model calculation result of the parts is accurate.
As a preferable scheme of the NVH simulation analysis and evaluation method of the hybrid assembly, the invention 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 the whole finite element model;
performing grid division on the whole machine, and performing modal calculation;
comparing the modal calculation result with a modal result obtained by an actual test;
if the error is within 10%, the overall machine mode calculation result is considered to be accurate, and model checking is realized.
As a preferable scheme of the NVH simulation analysis and evaluation method of the hybrid assembly, the invention comprises the following steps: the method for predicting the noise radiation level of the whole machine under the simulated excitation force further comprises the steps of establishing a field point network according to an ISO standard, simulating the sound pressure level when the model machine calibration is not formed, and evaluating the vibration noise level of the whole machine.
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, including,
the piston kinematic simulation model building module is used for building a piston kinematic simulation model through piston kinematic analysis, adopting a combustion analysis result as an excitation, inputting the combustion analysis result into the piston kinematic simulation model, and obtaining a piston kinematic result;
the timing kinematic simulation model building module is used for building a timing chain kinematic simulation model through timing system analysis and obtaining a timing chain kinematic result through simulating the motion of the timing system;
the valve train kinematic simulation model building module is used for building a valve train kinematic model through valve train kinematic analysis and obtaining a valve train kinematic result through valve train kinematic simulation;
the whole machine finite element model building module is used for building part models and carrying the part models into a whole machine finite element model to realize 3D finite element grid division;
and the whole machine acoustic radiation model building module is used for taking the piston kinematics result, the timing chain kinematics result and the valve train kinematics result as excitation, inputting the excitation into the whole machine finite element model, building a whole machine acoustic radiation model and predicting the noise radiation level of the whole machine under the simulation excitation force.
In a third aspect, embodiments of the present invention provide a computer apparatus comprising a memory and a processor, the memory storing a computer program, wherein: the processor, when executing the computer program, performs the steps of any of the methods described above.
In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, wherein: the computer program implementing the steps of the first aspect when executed by a processor.
The invention has the beneficial effects that:
1. the invention can accurately predict the noise radiation level of the whole machine on the premise of only early design parameters and digital-analog, and compared with the noise test after waiting for the appearance of a prototype, the invention has the advantages of more advanced anticipation and effective control on the NVH of the hybrid assembly;
2. in the prior art, single valve system is adopted for simulation analysis, and the invention adopts multi-valve system simulation analysis considering different shaft sections of the cam shaft; the invention relates to a NVH simulation analysis method for a gas distribution assembly, a piston assembly and a crankshaft assembly, which are independent, and the NVH simulation analysis method is characterized in that the three assemblies, a wheel system, a cylinder body and a cylinder cover which are connected with each other, and an intake and exhaust manifold which are attached with the three assemblies are used for considering load transmission among the assemblies and the NVH simulation analysis of the whole engine which is integrated due to structure and part change, and most of excitation on the engine is covered by means of piston kinematics, crankshaft kinematics, valve system kinematics and timing kinematics, so that the NVH simulation prediction is closer to the actual level.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a flow chart of a hybrid assembly NVH simulation analysis and evaluation method.
Fig. 2 shows the deformation of the different shaft segments of the cam shaft without VVT.
FIG. 3 is a diagram of a multiple valve train simulation analysis model.
FIG. 4 shows the force of the camshaft of each cylinder on the valve lifter.
Fig. 5 shows the impact force of each cylinder valve on the valve seat.
Fig. 6 shows the vertical load of the camshaft segments on the bearing.
Fig. 7 shows the transverse loading of the camshaft segments on the bearing.
FIG. 8 is a lifter with abnormal wear of the fourth cylinder of prototype 1.
FIG. 9 is an optimized tappet force.
Fig. 10 is a lifter of prototype 2# fourth cylinder without abnormal wear.
Fig. 11 is a complete machine NVH integrated simulation analysis model of the hybrid dedicated engine.
Fig. 12 is a diagram of the vibration acceleration cloud of the whole machine before optimization.
Fig. 13 is an optimized whole machine vibration acceleration cloud chart.
Fig. 14 shows the front end torsional vibration of the crankshaft before optimization.
FIG. 15 is an optimized crankshaft front end torsional vibration.
Fig. 16 is a plot of sound pressure power at the front end of prototype # 1.
Fig. 17 is a plot of sound pressure power at the front end of prototype # 2.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
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 other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be 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, for a first embodiment of the present invention, the embodiment provides a hybrid assembly NVH simulation analysis and evaluation method, which can accurately predict the noise radiation level of a complete machine on the premise of only the early design parameters and the digital-analog, and specifically includes the following steps:
s101: and establishing a piston kinematics simulation model through piston kinematics analysis, adopting a combustion analysis result as an excitation, and inputting the combustion analysis result into the piston kinematics simulation model to obtain a piston kinematics result.
In the process of developing the performance of a special engine for certain mixing, firstly, a piston finite element model is established through piston kinematic analysis, the piston is segmented, and 3D entity finite element meshing is directly carried out on the piston.
Wherein meshing comprises: and (3) introducing the piston model into finite element analysis preprocessing software, and dividing the piston into areas. The direct 3D meshing can ensure the precision of the subsequent piston stress calculation.
Furthermore, the in-cylinder explosion pressure obtained by the earlier stage combustion analysis is applied to the piston to be used as the excitation of the piston motion, so that the piston kinematic simulation is realized, and finally, a piston temperature field result and a piston kinematic output are obtained and are fed into the crank kinematic analysis.
S102: and (3) establishing a timing chain kinematics simulation model through timing system analysis, and acquiring a timing chain kinematics result through simulating the movement of the timing system.
In the analysis of the timing system, the timing chain is driven to rotate by the motion of the crankshaft in the motion of the crankshaft, the timing chain is used as the input of the timing chain, the timing system is built, the 3D meshing is carried out on accessories such as the chain, the guide plate and the like, and finally the motion result of the timing chain is simulated.
S103: and establishing a valve train kinematic model through valve train kinematic analysis, and obtaining a valve train kinematic result through valve train kinematic simulation.
In the valve train simulation as well, the valve train excitation force can be obtained by the valve train kinematic simulation.
S104: and building a part model and carrying the part model as a complete machine finite element model to realize 3D finite element grid division.
It should be noted that, the special starting parts are mixed at the same time to carry out grid division, and the modal calculation is carried out, and the modal result obtained by the actual test is compared with the standard. Ensuring that the simulation result error is within 5%, and considering that the model calculation result of the parts is accurate, so as to realize model checking.
Furthermore, the finite element models of all key parts are combined, the whole machine finite element model is carried, the standard comparison is carried out with the mode test result of the actual test, the error is within 10%, the mode calculation result of the whole machine is considered to be accurate, and the model checking is realized.
S105: and (3) taking a piston kinematic result, a timing chain kinematic result and a valve train kinematic result as excitation, inputting the excitation into a complete machine finite element model, establishing a complete machine acoustic radiation model, and predicting the noise radiation level of the complete machine under the simulated excitation force.
It should be noted that the excitation of vibration and noise of the whole hybrid assembly mainly comes from vibration and noise generated by operation of four components of 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 gas distribution assembly, the piston assembly, and the crankshaft assembly driven by the combustion system. And the three moving components of the distribution component, the piston component and the crankshaft component are also provided with loads which are mutually transmitted.
It should be noted that, these kinematic models are excited and loaded onto the complete machine finite element model, the complete machine acoustic radiation simulation model is carried, and according to the ISO standard, the site grid is established, so that the function of simulating the sound pressure level of the complete machine when the model machine is calibrated and not yet molded is realized, the vibration noise level of the complete machine can be better evaluated, the early prediction is realized, and the alteration risk caused by locking the later model machine is avoided.
Further, this embodiment also provides a hybrid assembly NVH simulation analysis and evaluation system, including:
the piston kinematic simulation model building module 201 is configured to build a piston kinematic simulation model through piston kinematic analysis, and adopt a combustion analysis result as an excitation and input the combustion analysis result into the piston kinematic simulation model to obtain a piston kinematic result;
the timing kinematic simulation model building module 202 is configured to build a timing chain kinematic simulation model through timing system analysis, and obtain a timing chain kinematic result through simulating the motion of the timing system;
the valve train kinematic simulation model building module 203 is configured to build a valve train kinematic model through valve train kinematic analysis, and obtain a valve train kinematic result through valve train kinematic simulation;
the whole machine finite element model building module 204 is used for building a part model and carrying the part model as a whole machine finite element model to realize 3D finite element grid division;
and the complete machine acoustic radiation model building module 205 is configured to input the piston kinematics result, the timing chain kinematics result and the valve train kinematics result as excitation into the complete machine finite element model, build a complete machine acoustic radiation model, and predict a noise radiation level of the complete machine under a simulated excitation force.
The embodiment also provides a computer device, which is suitable for the situation of the hybrid assembly NVH simulation analysis and evaluation method, and comprises the following steps: 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 hybrid assembly NVH simulation analysis and evaluation method according to the embodiment.
The computer device may be a terminal comprising a processor, a memory, a communication interface, a display screen and 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 includes a non-volatile 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 the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode 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, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
The present embodiment also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the NVH simulation analysis evaluation method for implementing the hybrid assembly as set forth in the above embodiment.
The storage medium according to the present embodiment belongs to the same inventive concept as the data storage method according to the above embodiment, and technical details not described in detail in the present embodiment can be seen in the above embodiment, and the present embodiment has the same advantageous effects as the above embodiment.
Example 2
Referring to fig. 2 to 17, for a second embodiment of the present invention, this embodiment provides a hybrid assembly NVH simulation analysis and evaluation method, and in order to verify the beneficial effects of the present invention, scientific demonstration is performed through simulation experiments.
Taking a special engine platform with 1.5 liters as an example, the original engine type cancels DVVT (digital video valve timing) connected with an air inlet and outlet cam shaft, and changes the structures of a chain of a front-end gear train and an air inlet and outlet manifold. Therefore, the task of integrated simulation analysis of the NVH of the whole platform hybrid assembly is to simulate the NVH performance problem of the hybrid special engine after the engine structure and parts are changed, and an effective solution is provided.
For canceling the DVVT of the intake and exhaust cam shaft, the impact force changes among the cam shaft, the tappet, the valve seat and the bearing caused by the phase change of the valve opening under the action of cylinder pressure are mainly changed; for changing the mute chain of the front-end gear train into an unmuted chain, the influence mainly changes the driving torque vibration among the gear trains, and the driving torque vibration is transmitted to the front end of the crankshaft so as to influence the torque vibration of the crank pulley; for the change of the intake and exhaust manifold structure, the change of heat distribution mainly influences the deformation of the cylinder body, so as to influence the movement of the piston, and the movement of the piston in turn influences the vibration and knocking of the cylinder body.
Under the conditions of considering the rigidity of different shaft sections of the camshaft in the length direction and canceling the influence of DVVT of intake and exhaust, abaqus is firstly applied to carry out simulation analysis on the camshaft without the VVT to obtain the deformation of different shaft sections of each cylinder of the camshaft, the deformation is converted into rigidity, and then the rigidity is substituted into a Valdyn model of Ricardo to carry out simulation analysis without the DVVT. And (3) carrying out multi-valve system modeling simulation analysis on the N15 model to obtain different impact forces of each cylinder valve on a valve seat and loads born by each cylinder camshaft bearing seat.
As shown in fig. 2 to 8, it can be seen from the results that the acting forces of the cam shafts of the cylinders on the valve lifters are different, and the lifter stress of the fourth cylinder exceeds the evaluation index. From the test results of model # 1 (before optimization) at the later stage, the lifter of the fourth cylinder was indeed subjected to abnormal wear. Other cylinders also show different values for impact force on valve seats, vertical and lateral loads of camshaft shaft segments on bearings.
As shown in fig. 9 and 10, on the premise of ensuring the dynamic performance of the hybrid assembly, the valve molded line and the valve spring force are readjusted and then are substituted into a multi-valve system model for simulation analysis, and the result shows that the stress of each tappet of each cylinder is effectively reduced and is lower than an evaluation index value, and the experimental result of a later model machine # 2 (after optimization) shows that the tappet of the fourth cylinder has no abnormal abrasion. The problem of the unusual wearing and tearing that the too big effort of camshaft to fourth jar valve tappet caused after canceling DVVT is solved. And different impact forces of each cylinder valve to the valve seat and stress conditions of each bearing seat can be foreseen.
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 has an influence on the deformation of the cylinder head of the cylinder body, so that the movement of the piston is influenced, and the movement of the piston in turn influences the vibration and knocking of the cylinder body. Based on the above reasons, valdyn, fearce, engdyn software of Ricardo is utilized to build a complete machine NVH integrated simulation analysis model which comprises an air intake and exhaust multi-valve system, a front end gear train, a crankshaft, a cylinder cover thermal deformation and a suspension system, so that the driving torque of a camshaft is transmitted to the front end of the crankshaft through the front end gear train to act together with the torque of the crankshaft, and the torque vibration of a crank pulley is output as a result.
It should be noted that, the evaluation content of the NVH of the whole engine mainly relates to crankshaft torsional vibration, whole engine vibration, 1 meter sound pressure level/sound power, sound pressure/sound intensity and the like.
The sound pressure of the whole engine is required to meet evaluation standards of five surfaces, the sound pressure value condition of each surface is analyzed, noise frequency distribution and component size are obtained through a sound pressure curve, 1/3 octaves and a Colormap diagram, the vibration peak frequency component and the corresponding rotating speed of the engine are analyzed, and the peak contribution frequency range is found, so that the problem is solved.
As shown in fig. 11, in the NVH integrated simulation analysis result of the hybrid dedicated engine, it was found that the lower middle part of the engine front cover had a relatively large vibration acceleration around 4200 rpm. The simulation analysis result of the crankshaft assembly is checked to find that the torsional vibration of the crankshaft of the engine at the 4-order of 4200rpm also has small peaks, and the amplitude of the torsional vibration is close to the evaluation index. Thus, the symptom point of the problem is basically locked, and the parameters of the crankshaft assembly are required to be adjusted in turn, so that the torsional vibration of the front end of the crankshaft is reduced, and the vibration acceleration of the front end cover of the engine is reduced under the working condition. In the post test, the 1 meter acoustic power curve of the test point at model # 1 (not optimized) also exhibits a small peak in the 4100-4300 rpm range, while the 1 meter acoustic pressure power curve of the test point at model # 2 (optimized) decreases at a small peak in the 4100-4300 rpm range.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, 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 the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (6)
1. A hybrid assembly NVH simulation analysis and evaluation method is characterized in that: comprising the steps of (a) a step of,
establishing a piston kinematic simulation model through piston kinematic analysis, adopting a combustion analysis result as an excitation, and inputting the combustion analysis result into the piston kinematic simulation model to obtain a piston kinematic result;
the timing chain kinematic simulation model is established through timing system analysis, and a timing chain kinematic result is obtained through simulating the motion of the timing system;
establishing a valve train kinematic model through valve train kinematic analysis, and acquiring a valve train kinematic result through valve train kinematic simulation;
building a part model and carrying the part model as a complete machine finite element model to realize 3D finite element grid division;
the piston kinematics result, the timing chain kinematics result and the valve train kinematics result are used as excitation and are input into a complete machine finite element model, a complete machine acoustic radiation model is built, and the noise radiation level of the complete machine under the simulation excitation force is predicted;
establishing a piston finite element model through piston kinematics analysis;
partitioning the piston, and directly performing 3D entity finite element grid division on the piston;
the in-cylinder explosion force obtained by applying the early combustion analysis to the piston is used as the excitation force of the piston movement, so that the piston dynamics simulation is realized;
obtaining a piston temperature field result and a piston kinematic result, and outputting the results to crank kinematic analysis;
the timing chain is driven to rotate through the motion of a crankshaft in the kinematics of the crankshaft;
taking the motion of the timing chain as input to complete the construction of a kinematic simulation model of the timing system;
performing 3D entity finite element meshing on the accessory;
obtaining a timing chain kinematic result;
dividing grids of the parts and performing modal calculation;
comparing the modal calculation result with the modal result obtained by the actual test;
if the simulation result error is within 5%, the model checking is realized by considering that the model calculation result of the parts is accurate;
combining the finite element models of all key parts, and carrying the whole finite element model;
performing grid division on the whole machine, and performing modal calculation;
comparing the modal calculation result with the modal result obtained by the actual test;
if the error is within 10%, the overall machine mode calculation result is considered to be accurate, and model checking is realized.
2. The hybrid assembly NVH simulation analysis and evaluation method of claim 1, further comprising: the specific steps of obtaining the kinematic results of the valve system include,
taking the contribution of valve seating force to vibration noise into consideration, and establishing a valve train kinematic model;
valve train excitation is obtained through valve train kinematic simulation and is input into the valve train kinematic model;
and obtaining the kinematic result of the valve system.
3. The hybrid assembly NVH simulation analysis and evaluation method of claim 1, further comprising: the meshing includes: and importing the model into finite element analysis preprocessing software to divide the region.
4. The hybrid assembly NVH simulation analysis and evaluation system is based on the hybrid assembly NVH simulation analysis and evaluation method of any one of claims 1-3, and is characterized in that: comprising the steps of (a) a step of,
the piston kinematics simulation model building module (201) is used for building a piston kinematics simulation model through piston kinematics analysis, adopting a combustion analysis result as an excitation, inputting the combustion analysis result into the piston kinematics simulation model, and obtaining a piston kinematics result;
the timing kinematic simulation model building module (202) is used for building a timing chain kinematic simulation model through timing system analysis and obtaining a timing chain kinematic result through simulating the movement of the timing system;
the valve train kinematic simulation model building module (203) is used for building a valve train kinematic model through valve train kinematic analysis and obtaining a valve train kinematic result through valve train kinematic simulation;
the whole machine finite element model building module (204) is used for building part models and carrying the part models into a whole machine finite element model to realize 3D finite element grid division;
and the whole machine acoustic radiation model building module (205) is used for inputting a piston kinematic result, a timing chain kinematic result and a valve train kinematic result into the whole machine finite element model as excitation, building a whole machine acoustic radiation model and predicting the noise radiation level of the whole machine under the simulated excitation force.
5. 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, implements the steps of the method of any one of claims 1 to 4.
6. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program, when executed by a processor, implements the steps of the method of any of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211352540.7A CN115758566B (en) | 2022-10-31 | 2022-10-31 | NVH simulation analysis and evaluation method and device for hybrid assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211352540.7A CN115758566B (en) | 2022-10-31 | 2022-10-31 | NVH simulation analysis and evaluation method and device for hybrid assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115758566A CN115758566A (en) | 2023-03-07 |
| CN115758566B true CN115758566B (en) | 2024-02-06 |
Family
ID=85354814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211352540.7A Active CN115758566B (en) | 2022-10-31 | 2022-10-31 | NVH simulation analysis and evaluation method and device for hybrid assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115758566B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008123274A (en) * | 2006-11-13 | 2008-05-29 | Mitsubishi Heavy Ind Ltd | Engine component design supporting method and system |
| CN104834763A (en) * | 2014-10-31 | 2015-08-12 | 北汽福田汽车股份有限公司 | Method for obtaining engine radiation noise and engine design optimization method |
| CN105279327A (en) * | 2015-10-16 | 2016-01-27 | 奇瑞汽车股份有限公司 | Computer simulation prediction method of in-car vibration and noise of car |
| CN112597676A (en) * | 2020-12-10 | 2021-04-02 | 东风汽车集团有限公司 | Automobile suspension vibration source sensitivity identification method and device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109711061B (en) * | 2018-12-28 | 2021-06-04 | 重庆长安汽车股份有限公司 | Power assembly suspension robustness optimization method based on whole vehicle idling vibration performance |
| CN114021366A (en) * | 2021-11-12 | 2022-02-08 | 东风汽车股份有限公司 | Simulation analysis method for light truck frame assembly |
-
2022
- 2022-10-31 CN CN202211352540.7A patent/CN115758566B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008123274A (en) * | 2006-11-13 | 2008-05-29 | Mitsubishi Heavy Ind Ltd | Engine component design supporting method and system |
| CN104834763A (en) * | 2014-10-31 | 2015-08-12 | 北汽福田汽车股份有限公司 | Method for obtaining engine radiation noise and engine design optimization method |
| CN105279327A (en) * | 2015-10-16 | 2016-01-27 | 奇瑞汽车股份有限公司 | Computer simulation prediction method of in-car vibration and noise of car |
| CN112597676A (en) * | 2020-12-10 | 2021-04-02 | 东风汽车集团有限公司 | Automobile suspension vibration source sensitivity identification method and device |
Non-Patent Citations (6)
| Title |
|---|
| NVH Performance Analysis and Optimization of a Vehicle Steering System;Li Jian et al.;Transactions of Beijing Institute of Technology;第35卷(第5期);全文 * |
| 发动机薄壁件结构振动优化;张磊;任海军;艾晓玉;钱凌锋;蓝军;;振动工程学报(06);全文 * |
| 某柴油机结构辐射噪声预测;冯垣洁;杨贵春;陈卓群;;小型内燃机与车辆技术;46(01);68-72 * |
| 某直列四缸柴油机振动仿真分析与试验验证;李贵;朱敬安;陈洪涛;王志鹏;;拖拉机与农用运输车(06);全文 * |
| 消隙齿轮降低柴油机怠速噪声的应用研究;李民;陈烨龙;庞建武;杜慧勇;徐斌;;农业工程学报(01);全文 * |
| 马成勋.第十五届全国膨胀节学术会议论文集 膨胀节技术进展.合肥：合肥工业大学出版社,2018,120-121. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115758566A (en) | 2023-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Junhong et al. | CAE process to simulate and optimise engine noise and vibration | |
| Mao et al. | Sound quality improvement for a four-cylinder diesel engine by the block structure optimization | |
| Isermann et al. | Design of computer controlled combustion engines | |
| Novotny et al. | Investigating the influence of computational model complexity on noise and vibration modeling of powertrain | |
| Chen et al. | Study of crankshaft strength based on iSIGHT platform and DOE methods | |
| CN115758566B (en) | NVH simulation analysis and evaluation method and device for hybrid assembly | |
| CN112597676B (en) | Automobile suspension vibration source sensitivity identification method and device | |
| Shahgholi et al. | Computational analysis of the effect of balancer on the vibration performance of the engine: Experimental and simulation | |
| Velmurugan et al. | Prediction of noise, vibration and exhaust gas emission characteristics using palm oil in a four stroke diesel | |
| Souflas et al. | Mode transition optimisation for variable displacement engines | |
| Siano et al. | Noise prediction of a multi-cylinder engine prototype using multi-body dynamic simulation | |
| CN107491570A (en) | A kind of cylinder head cover gasket seal detection method based on finite element analysis | |
| Takagishi et al. | Prediction of camshaft torque and timing chain load for turbo direct injection diesel engine | |
| Yang et al. | Reduction of Engine Sound Radiation through Optimization of Added Ribs | |
| Rivola et al. | Dynamic analysis of a motorbike engine timing system: Experimental and numerical investigation of the geartrain | |
| Urano et al. | Optimization technique for transient emission reduction of heavy duty diesel engine | |
| Khandelwal et al. | Design Development and Weight Optimization of Crankshaft for Commercial Vehicle Application | |
| Deighan et al. | Advanced Analysis Techniques for NVH and Sound Quality Improvement | |
| Mohammad et al. | Structure borne noise optimization of diesel engine by simulation | |
| Kohr et al. | Methodology for the geometric layout of a mechanically fully variable valve train with two synchronously rotating cam disks | |
| Lu et al. | NVH optimization of vehicle powertrain | |
| Fridrichová et al. | Comparative study of engine dynamics for rolling and selective cylinder deactivation | |
| Montazersadgh | Development of an automated cam profile designer and optimizer | |
| Foy et al. | Structural Noise Prediction of an Inline 4 Cylinder Balance Shaft System Using Co-simulation | |
| Bogomolov et al. | Development of Design Assistance System and Its Application for Engine Concept Modeling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |