CN108363868A - Exhaust system suspension hook location arrangements method - Google Patents
Exhaust system suspension hook location arrangements method Download PDFInfo
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- CN108363868A CN108363868A CN201810142017.9A CN201810142017A CN108363868A CN 108363868 A CN108363868 A CN 108363868A CN 201810142017 A CN201810142017 A CN 201810142017A CN 108363868 A CN108363868 A CN 108363868A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
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Abstract
The invention discloses a kind of exhaust system suspension hook location arrangements methods, this method acquires exhaust system suspension hook and arranges required exhaust system model and power assembly parameter first, and its finite element model is established accordingly, quality of materials and attribute are assigned in finite element model, by carrying out model analysis to exhaust system, obtain mode node location, then it is required according to the reconnaissance of lift hook position, it is preliminary to choose suspension hook position point, finally, according to tentatively selected suspension hook position point according to, carry out static force and dynamic force check analysis, compared with prior art, the reasonability of lift hook position can effectively be verified.The optimum choice of exhaust system suspension hook position can be realized early period in automobile research in method provided by the invention, it can be in early stage by testing the ride comfort progress the matching analysis to exhaust system and vehicle, it can effectively predict influence of the suspension hook to vehicle NVH, and this method can greatly simplify the design process of exhaust system, reduce R＆D costs.
Description
Technical field
The present invention relates to automobile exhaust system technical fields, more particularly to a kind of exhaust system suspension hook location arrangements side
Method.
Background technology
With economy and auto industry rapid development and, the living standard of the people is quickly improved, automobile gradually at
For the trip walking-replacing tool of average family.Originally the dynamic property of automobile, it is primary when safety and low oil consumption etc. are client's purchase vehicles
Reference standard, then Automobile Enterprises are among main development effort and input to the research and development and improvement in terms of these.But
With attention and care of the client for subjective feeling in recent years, only with dynamic property, safety is not enough to inhale with oil consumption level
Draw more potential consumers.In this background, the NVH performances (Noise, Vibration, Harshness) of automobile are gradual
It has been brought to brand-new stage.The optimization of NVH performances becomes an important link in Research ＆ Development of Automobile whole flow process.
In the car, exhaust system one end is connected with engine, and the other end is connected by linking up with car body, and engine shakes
It is dynamic to transmit exhaust system, car body is then passed to by suspension hook again.The vibration of car body is direct by seat, steering wheel and floor
It is transmitted to customer, while the vibration of car body can also be radiate, generates noise in the car, therefore, the power that car body is passed in control is row
One of the most important target of gas system vibration control.
The installation site of rational selection suspension hook plays an important roll control NVH, if by suspension hook be mounted on vibration compared with
Big position can cause normal NVH more serious, influence ride experience.In the prior art, exhaust system suspension hook location arrangements are all
It is to use empirical value, the location arrangements of final suspension hook can be caused not reasonable, affect the property of vehicle noise, vibration and comfort
Energy.
Invention content
For this purpose, one embodiment of the present of invention proposes a kind of exhaust system suspension hook location arrangements method, the position of suspension hook is solved
It sets and arranges unreasonable problem.
According to exhaust system suspension hook location arrangements method provided by the invention, including：
Acquire exhaust system model and power assembly parameter；
Exhaust system finite element model is established according to the exhaust system model and the power assembly parameter, and described
Quality of materials and attribute are assigned in exhaust system finite element model；
Model analysis is carried out to the exhaust system, obtains the mode node location of the exhaust system；
It is required according to the reconnaissance of lift hook position, tentatively chooses the suspension hook position point of the exhaust system；
Static analysis and dynamic force analysis are carried out successively to the suspension hook position point tentatively chosen, judge suspension hook by static(al)
Whether it is satisfied by design requirement with by dynamic force；
If suspension hook is satisfied by design requirement by static(al) and by dynamic force, it is determined that the suspension hook position point tentatively chosen is
Final suspension hook position point；
If suspension hook does not meet design requirement by static(al) and by dynamic force one of which, wanted according to the reconnaissance of lift hook position
It asks, chooses the suspension hook position point of the exhaust system again, hung until the suspension hook position point chosen again is corresponding
Hook is satisfied by design requirement by static(al) and by dynamic force.
According to exhaust system suspension hook location arrangements method provided by the invention, acquire first needed for exhaust system suspension hook arrangement
The exhaust system model and power assembly parameter wanted, and its finite element model is established accordingly, material is assigned in finite element model
Quality and attribute obtain mode node location, then according to the reconnaissance of lift hook position by carrying out model analysis to exhaust system
It is required that tentatively choose suspension hook position point, finally, according to tentatively selected suspension hook position point according to, carry out static force and
Dynamic force check analysis can effectively verify the reasonability of lift hook position compared with prior art.Method provided by the invention is whole
Vehicle, which is developed, can be realized the optimum choice of exhaust system suspension hook position early period, can early stage by experiment to exhaust system with it is whole
The ride comfort of vehicle carries out the matching analysis, can effectively predict influence of the suspension hook to vehicle NVH, and this method can greatly simplify
The design process of exhaust system, reduces R＆D costs.
In addition, according to the above-mentioned exhaust system suspension hook location arrangements method of the present invention, there can also be following additional skill
Art feature：
Further, the acquisition exhaust system model and the step of power assembly parameter, include：
The digital-to-analogue and its corresponding quality information for urging assembly to tail pipe assembly in the exhaust system in the past are acquired, and is adopted
Collect power assembly, suspension, lifting lug parameter information.
Further, described that model analysis is carried out to the exhaust system, obtain the mode node position of the exhaust system
The step of setting include：
Modal vibration characteristic of the exhaust system within the scope of 20-200HZ is obtained, dynamic assembly suspension and vehicle body are constrained
The degree of freedom of junction and the degree of freedom for constraining suspension hook and vehicle body connecting place, obtain the mode node position of the exhaust system
It sets.
Further, described to be required according to the reconnaissance of lift hook position, tentatively choose the suspension hook cloth set of the exhaust system
The step of setting include：
On the basis of model analysis, using average driving degree of freedom method, it will be hung from hot junction to cold end along exhaust pipe axis
Hook position number consecutively；
Displacement summation is weighted to each rank mode, obtains the weighting vibration shape instruction displacement of each potential lift hook position；
It is required according to the reconnaissance of lift hook position, takes weighting instruction displacement smaller as the potential position of suspension hook.
Further, described the step of carrying out static analysis to the suspension hook position point tentatively chosen, includes：
In hyper mesh softwares, apply the load of 1g in gravitational field to constructed exhaust system finite element model
Lotus calculates the static(al) suffered by each suspension hook position point tentatively chosen.
Further, described the step of clicking through the analysis of Mobile state power to the suspension hook position tentatively chosen, includes：
According to tentatively selected suspension hook position point, apply the torque that load is 100Nm in power assembly Y-direction, it is right
The each suspension hook position tentatively chosen clicks through the analysis of Mobile state power.
Further, the method further includes：
According to tentatively selected suspension hook position point, apply the torque that load is 100Nm in power assembly Y-direction, it is right
The each suspension hook position tentatively chosen clicks through the analysis of Mobile state power；
It is the dynamic force in 20~200Hz suffered by suspension hook to calculate frequency range, is judged in 20~200Hz suffered by suspension hook
Whether dynamic force meets design requirement.
Further, described that exhaust system finite element is established according to the exhaust system model and the power assembly parameter
Model, and assign quality of materials in the exhaust system finite element model and the step of attribute includes：
Suspension hook is reduced to beam element-CBAEM, exhaust pipe uses 6mm 2D mesh generations；
Bellows is assigned using CONM2 on pipeline using spring CBUSH simulations, the quality of bellows；
Rubber block between master end suspension hook and passive side suspension hook encloses three-way rigidity using spring CBUSH simulations；
Flange is divided using the tetrahedron or hexahedral mesh of 6mm, and is connect with pipeline using RBE2；
Engine mounting encloses three-way rigidity using spring CBUSH simulations；
Power assembly is indicated using lumped mass at Motor Mass Centre, using the attached power assembly quality of CONM2 and rotation
Inertia；
It is connected with RBE2 between engine mounting and engine.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or embodiment through the invention is recognized.
Description of the drawings
In description of the above-mentioned and/or additional aspect and advantage of the embodiment of the present invention from combination following accompanying drawings to embodiment
It will be apparent and be readily appreciated that, wherein：
Fig. 1 is the flow chart of exhaust system suspension hook location arrangements method according to a first embodiment of the present invention；
Fig. 2 is the exhaust system established in exhaust system suspension hook location arrangements method according to a second embodiment of the present invention
CAD model；
Fig. 3 is the exhaust system established in exhaust system suspension hook location arrangements method according to a second embodiment of the present invention
Finite element model；
Fig. 4 is suspension hook potential site point in exhaust system suspension hook location arrangements method according to a second embodiment of the present invention
Distribution map；
Fig. 5 is suspension hook static force value figure in exhaust system suspension hook location arrangements method according to a second embodiment of the present invention；
Fig. 6 is suspension hook dynamic force curve in exhaust system suspension hook location arrangements method according to a second embodiment of the present invention
Figure.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to Fig. 1, the exhaust system suspension hook location arrangements method that first embodiment of the invention proposes, including following step
Suddenly：
S101 acquires exhaust system model and power assembly parameter；
S102 establishes exhaust system finite element model according to the exhaust system model and the power assembly parameter, and
Quality of materials and attribute are assigned in the exhaust system finite element model；
S103 carries out model analysis to the exhaust system, obtains the mode node location of the exhaust system；
S104 requires according to the reconnaissance of lift hook position, tentatively chooses the suspension hook position point of the exhaust system；
S105 carries out static analysis to the suspension hook position point tentatively chosen and dynamic force is analyzed, judges suspension hook successively
Whether it is satisfied by design requirement by static(al) and by dynamic force；
S106, if suspension hook is satisfied by design requirement by static(al) and by dynamic force, it is determined that the suspension hook cloth set tentatively chosen
Set is a little final suspension hook position point；
S107, if suspension hook does not meet design requirement by static(al) and by dynamic force one of which, according to the choosing of lift hook position
Point requires, and chooses the suspension hook position point of the exhaust system again, until the suspension hook position point chosen again corresponds to
Suspension hook be satisfied by design requirement by static(al) and by dynamic force.
Exhaust system suspension hook location arrangements method according to the ... of the embodiment of the present invention acquires exhaust system suspension hook and arranges institute first
The exhaust system model and power assembly parameter needed, and its finite element model is established accordingly, material is assigned in finite element model
Expect quality and attribute, by carrying out model analysis to exhaust system, mode node location is obtained, then according to the choosing of lift hook position
Point requirement, it is preliminary to choose suspension hook position point, finally, according to tentatively selected suspension hook position point according to progress static force
The reasonability of lift hook position can be effectively verified with dynamic force check analysis compared with prior art.Method provided by the invention exists
The optimum choice of exhaust system suspension hook position can be realized early period in automobile research, can early stage by experiment to exhaust system with
The ride comfort of vehicle carries out the matching analysis, can effectively predict influence of the suspension hook to vehicle NVH, and this method can be significantly simple
The design process for changing exhaust system, reduces R＆D costs.
The exhaust system suspension hook location arrangements method that second embodiment of the invention proposes, includes the following steps：
S201 acquires exhaust system model and power assembly parameter, wherein the exhaust system model includes urging in the past always
At to tail pipe assembly digital-to-analogue and its corresponding quality information, the power assembly parameter include power assembly, suspension, lifting lug ginseng
Number information.
Specifically, referring to Fig. 2, exhaust system model parameter specifically includes：Before urge assembly quality, bellows quality and its
Rigidity value, after urge assembly quality, muffler ASSY quality, tail pipe assembly quality.
The power assembly parameter of acquisition please participate in following table：
S202 establishes exhaust system finite element model according to the exhaust system model and the power assembly parameter, and
Quality of materials and attribute are assigned in the exhaust system finite element model；
Wherein, foundation finite element model as shown in figure 3,
Suspension hook is reduced to beam element-CBAEM, exhaust pipe uses 6mm 2D mesh generations；
Bellows is assigned using CONM2 on pipeline using spring CBUSH simulations, the quality of bellows；
Rubber block between master end suspension hook and passive side suspension hook encloses three-way rigidity using spring CBUSH simulations；
Flange is divided using the tetrahedron or hexahedral mesh of 6mm, and is connect with pipeline using RBE2；
Engine mounting encloses three-way rigidity using spring CBUSH simulations；
Power assembly is indicated using lumped mass at Motor Mass Centre, using the attached power assembly quality of CONM2 and rotation
Inertia；
It is connected with RBE2 between engine mounting and engine.
S203 carries out model analysis to the exhaust system, obtains the mode node location of the exhaust system；
Specifically, obtaining modal vibration characteristic of the exhaust system within the scope of 20-200HZ, constraint power assembly is outstanding
It sets and the degree of freedom of vehicle body junction (1.2.3.4.5.6) and oneself of constraint suspension hook and vehicle body connecting place (1.2.3.4.5.6)
By spending, the mode node location of the exhaust system is obtained.
S204 requires according to the reconnaissance of lift hook position, tentatively chooses the suspension hook position point of the exhaust system；
Wherein, lift hook position reconnaissance require for example including：
1) lift hook position, the rigidity of hanging, the rigidity of hook are reasonably selected, exhaust system is made to be transmitted to overcoming on vehicle body
It measures small；
2) it to avoid overlapping with vehicle intrinsic frequency range, avoid overlapping with the driving frequency of engine；
3) when designing exhaust system, to make its mode the smaller the better, if mode is too many, certain frequencies of system
Rate is easy to be energized, and vibration is easy to be passed to car body；
4) exhaust suspension hook is selected as possible in the higher position of body stiffness；
The step specifically includes：
S2041, on the basis of model analysis, using average driving degree of freedom method, along exhaust pipe axis from hot junction to cold
Lift hook position number consecutively, number are please referred to Fig. 4 by end；
S2042 is weighted displacement summation to each rank mode, obtains the weighting vibration shape indicating bit of each potential lift hook position
It moves；
S2043 is required according to the reconnaissance of lift hook position, takes weighting instruction displacement smaller as the potential cloth set of suspension hook
It sets, please refers to Fig. 4.
It should be pointed out that since vehicle is in the design phase, each can need that suspension hook is installed based on experience value first
Region be arranged initial a suspension hook position point namely Fig. 4 in O1, O2, O3, O4.After optimization, it can obtain new
Suspension hook position point namely Fig. 4 in N1, N2, N3, N4, it should be pointed out that O2 and N2 is same position point, and O3
With N3 and same position point.Then by average driving degree of freedom method, respectively to O1 in four positions and N1, O2 and N2,
O3 is compared with N3, O4 and N4, calculates in these positions weighting instruction displacement smaller, from fig. 4, it can be seen that O1 with
The weighting of N1, N1 indicates displacement smaller, therefore (namely is tentatively chosen N1 as the potential position of suspension hook in step S205
Suspension hook position point)；For N2 compared with O2, the weighting indicating bit phase shift of the two is same therefore potential using O2/N2 as suspension hook
Position；Similarly, for N3 compared with O3, the weighting indicating bit phase shift of the two is same, therefore is potentially arranged using O3/N3 as suspension hook
Position；N4 is compared with O4, and the weighting of N4 indicates displacement smaller, therefore using N4 as the potential position of suspension hook.It may be noted that
, in actual implementation, the needs for considering integral arrangement space are also needed, by taking O1 and N1 as an example, although the weighting indicating bit of N1
Smaller is moved, then cannot be using N1 as the potential position of suspension hook but if placing suspension hook to N1 again without space, it can only
Using O1 as the potential position of suspension hook.
S205 carries out static analysis to the suspension hook position point tentatively chosen and dynamic force is analyzed, judges suspension hook successively
Whether it is satisfied by design requirement by static(al) and by dynamic force；
In hyper mesh softwares, 1g is applied in gravitational field (GRAV) to constructed exhaust system finite element model
Load, calculate the static(al) suffered by each suspension hook position point tentatively chosen, specific result of calculation such as following table, analysis
Operating mode such as Fig. 5：
| Suspension hook 1 | Suspension hook 2 | Suspension hook 3 | Suspension hook 4 | |
| Stress size (N) | 42.0 | 45.1 | 54.0 | 20.3 |
In upper table, suspension hook 1 refers to the suspension hook that the suspension hook position point N1 tentatively chosen is placed, what suspension hook 2 was tentatively chosen
The suspension hook that suspension hook position point O2/N2 is placed, suspension hook 3 refer to hanging for the suspension hook position point O3/N3 placements tentatively chosen
Hook, suspension hook 4 refer to the suspension hook that the suspension hook position point N4 tentatively chosen is placed.
Wherein, design requirement is, for example, to be not more than 60N, as can be seen from the above table, in the suspension hook cloth set tentatively chosen
It sets a suspension hook stress for arrangement and is both less than 60N, therefore meet design requirement.If it is to be noted that suspension hook stress be more than 60N,
Illustrate that there are security risks, then need to optimize exhaust system structure, then presses exhaust system suspension hook location arrangements flow weight
It is new to choose lift hook position, until meeting design requirement.
According to tentatively selected suspension hook position point, apply the torque that load is 100Nm in power assembly Y-direction, it is right
The each suspension hook position tentatively chosen clicks through the analysis of Mobile state power；
It is the dynamic force in 20~200Hz suffered by suspension hook to calculate frequency range, is judged in 20~200Hz suffered by suspension hook
Whether dynamic force meets design requirement, analysis result can refering to Fig. 6, by taking N4 and O4 as an example, from the point of view of dynamic force analysis result,
Prioritization scheme (i.e. N4) and former scheme (i.e. O4) all meet design requirement, but in contrast, prioritization scheme is more outstanding, therefore,
The dynamic force of N4 has clear improvement.
In addition, really being transmitted from the bending that can also be seen that in Fig. 6 due to exhaust system in the faces XOY to exhaust system
It to the vibration effect very little of vehicle body, can be neglected, therefore mainly consider that exhaust system is namely vented Z-direction in vertical plane and rings
It answers.
S206, if suspension hook is satisfied by design requirement by static(al) and by dynamic force, it is determined that the suspension hook cloth set tentatively chosen
Set is a little final suspension hook position point；
S207, if suspension hook does not meet design requirement by static(al) and by dynamic force one of which, according to the choosing of lift hook position
Point requires, and chooses the suspension hook position point of the exhaust system again, until the suspension hook position point chosen again corresponds to
Suspension hook be satisfied by design requirement by static(al) and by dynamic force.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (system of such as computer based system including processor or other can be held from instruction
The instruction fetch of row system, device or equipment and the system executed instruction) it uses, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicating, propagating or passing
Defeated program is for instruction execution system, device or equipment or the dress used in conjunction with these instruction execution systems, device or equipment
It sets.
The more specific example (non-exhaustive list) of computer-readable medium includes following：It is connected up with one or more
Electrical connection section (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only memory
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable
Medium, because can be for example by carrying out optical scanner to paper or other media, then into edlin, interpretation or when necessary with it
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each section of the present invention can be realized with hardware, software, firmware or combination thereof.Above-mentioned
In embodiment, software that multiple steps or method can in memory and by suitable instruction execution system be executed with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit application-specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiments or example in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (8)
1. a kind of exhaust system suspension hook location arrangements method, which is characterized in that including：
Acquire exhaust system model and power assembly parameter；
Exhaust system finite element model is established according to the exhaust system model and the power assembly parameter, and in the exhaust
Quality of materials and attribute are assigned in system finite element model；
Model analysis is carried out to the exhaust system, obtains the mode node location of the exhaust system；
It is required according to the reconnaissance of lift hook position, tentatively chooses the suspension hook position point of the exhaust system；
To the suspension hook position point tentatively chosen carry out successively static analysis and dynamic force analysis, judge suspension hook by static(al) and by
Whether dynamic force is satisfied by design requirement；
If suspension hook is satisfied by design requirement by static(al) and by dynamic force, it is determined that the suspension hook position point tentatively chosen is final
Suspension hook position point；
If suspension hook does not meet design requirement by static(al) and by dynamic force one of which, required according to the reconnaissance of lift hook position, weight
The suspension hook position point of the exhaust system is newly chosen, until the corresponding suspension hook of suspension hook position point chosen again is by quiet
Power and it is satisfied by design requirement by dynamic force.
2. exhaust system suspension hook location arrangements method according to claim 1, which is characterized in that the acquisition exhaust system
The step of model and power assembly parameter includes：
The digital-to-analogue and its corresponding quality information for urging assembly to tail pipe assembly in the exhaust system in the past are acquired, and acquisition is moved
Power assembly, suspension, lifting lug parameter information.
3. exhaust system suspension hook location arrangements method according to claim 1, which is characterized in that described to the exhaust system
System carries out model analysis, and the step of mode node location for obtaining the exhaust system includes：
Modal vibration characteristic of the exhaust system within the scope of 20-200HZ is obtained, constraint dynamic assembly suspension is connect with vehicle body
The degree of freedom at place and the degree of freedom for constraining suspension hook and vehicle body connecting place, obtain the mode node location of the exhaust system.
4. exhaust system suspension hook location arrangements method according to claim 1, which is characterized in that described according to lift hook position
Reconnaissance requirement, the step of suspension hook position point for tentatively choosing the exhaust system includes：
On the basis of model analysis, using average driving degree of freedom method, along exhaust pipe axis by suspension hook position from hot junction to cold end
Set number consecutively；
Displacement summation is weighted to each rank mode, obtains the weighting vibration shape instruction displacement of each potential lift hook position；
It is required according to the reconnaissance of lift hook position, takes weighting instruction displacement smaller as the potential position of suspension hook.
5. exhaust system suspension hook location arrangements method according to claim 1, which is characterized in that described to tentatively choosing
Suspension hook position point carry out static analysis the step of include：
In hyper mesh softwares, apply the load of 1g in gravitational field to constructed exhaust system finite element model, counts
Calculate the static(al) suffered by each suspension hook position point tentatively chosen.
6. exhaust system suspension hook location arrangements method according to claim 3, which is characterized in that described to tentatively choosing
Suspension hook position click through Mobile state power analysis the step of include：
According to tentatively selected suspension hook position point, apply the torque that load is 100Nm in power assembly Y-direction, to preliminary
The each suspension hook position chosen clicks through the analysis of Mobile state power.
7. exhaust system suspension hook location arrangements method according to claim 6, which is characterized in that the method further includes：
According to tentatively selected suspension hook position point, apply the torque that load is 100Nm in power assembly Y-direction, to preliminary
The each suspension hook position chosen clicks through the analysis of Mobile state power；
It is the dynamic force in 20~200Hz suffered by suspension hook to calculate frequency range, judges the dynamic suffered by suspension hook in 20~200Hz
Whether power meets design requirement.
8. exhaust system suspension hook location arrangements method according to claim 1, which is characterized in that described according to the exhaust
System model and the power assembly parameter establish exhaust system finite element model, and in the exhaust system finite element model
It assigns quality of materials and the step of attribute includes：
Suspension hook is reduced to beam element-CBAEM, exhaust pipe uses 6mm 2D mesh generations；
Bellows is assigned using CONM2 on pipeline using spring CBUSH simulations, the quality of bellows；
Rubber block between master end suspension hook and passive side suspension hook encloses three-way rigidity using spring CBUSH simulations；
Flange is divided using the tetrahedron or hexahedral mesh of 6mm, and is connect with pipeline using RBE2；
Engine mounting encloses three-way rigidity using spring CBUSH simulations；
Power assembly is indicated using lumped mass at Motor Mass Centre, using the attached power assembly quality of CONM2 and rotary inertia；
It is connected with RBE2 between engine mounting and engine.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109472094A (en) * | 2018-11-14 | 2019-03-15 | 北京长城华冠汽车技术开发有限公司 | It is vented sling point method for optimization analysis and system |
| CN113704879A (en) * | 2021-08-05 | 2021-11-26 | 重庆长安汽车股份有限公司 | Visualized correlation analysis method for engine radiation noise and combustion excitation |
| CN113849911A (en) * | 2021-09-26 | 2021-12-28 | 重庆长安汽车股份有限公司 | Rapid analysis and evaluation method for arrangement of hanging points of exhaust system |
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