CN113111465B - Rigid body and support elastomer combined modal analysis method for power assembly suspension system - Google Patents
Rigid body and support elastomer combined modal analysis method for power assembly suspension system Download PDFInfo
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Abstract
The invention relates to a rigid body and support elastomer combined modal analysis method for a power assembly suspension system. According to the invention, the rigid body and the support elastic body of the power assembly suspension system are combined to perform modal analysis, so that the system simulation degree is effectively improved, the time is saved, the efficiency is high, and the method has a very strong guiding significance for the subsequent NVH work of the system.
Description
Technical Field
The invention belongs to the technical field of modal analysis of a power assembly suspension system, and particularly relates to a rigid body and support elastomer combined modal analysis method of the power assembly suspension system.
Background
The power assembly suspension system mainly plays the roles of connecting the vehicle body frame and the power assembly, supporting the power assembly, limiting the motion of the power assembly and obstructing and attenuating the vibration of the power assembly. In order to realize the function of blocking and attenuating the vibration of the power assembly, the power assembly suspension system needs to perform rigid body modal analysis and support elastomer modal analysis on the power assembly in the design process.
The modal analysis is a modern method for researching the dynamic characteristics of a structure, and is the application of a system identification method in the field of engineering vibration. The modes are natural vibration characteristics of the mechanical structure, each having a specific natural frequency, damping ratio and mode shape. These modal parameters may be derived by calculation or experimental analysis, such a process of calculation or experimental analysis being referred to as modal analysis.
In the prior art, when a mode analysis is performed on a powertrain suspension system, the mode analysis of a rigid body of the powertrain and the mode analysis of a bracket elastic body are generally performed respectively. However, in the actual operation process of the vehicle, the power assembly suspension system as a whole realizes the function of blocking and attenuating the vibration of the power assembly, the existing mode analysis of the rigid body of the power assembly and the bracket elastic body respectively causes the lack of the simulation degree of the whole vehicle, and the process of performing the mode analysis respectively is inefficient and time-consuming, which is not beneficial to developing the subsequent NVH work of the system.
Disclosure of Invention
Aiming at the defects in the prior art, the invention discloses a joint modal analysis method for a rigid body and a support elastic body of a power assembly suspension system. The technical scheme of the invention is as follows by combining the attached drawings of the specification:
the joint modal analysis method comprises the steps of establishing a joint model by taking the rigid body and the support elastic body of the power assembly suspension system as a whole, carrying out constraint modal calculation according to the whole joint model, and evaluating the whole modal according to an obtained result.
Further, the combined modal analysis method comprises the following specific steps:
step S1: collecting modal analysis parameters of the power assembly;
step S2: establishing a joint model of a rigid body and a support elastic body of a power assembly suspension system;
and step S3: performing integral constraint modal calculation by adopting a joint model;
and step S4: evaluating the overall constrained mode calculation result;
further, in step S1, the collecting process of modal analysis parameters includes:
(1) Measuring the mass, the mass center and the rotational inertia of the power assembly without the suspension bracket;
(2) Refining the 3D data of the suspension support;
(3) Designing the rigidity of the suspension rubber;
further, the specific steps of step S2 are as follows:
step S21: build the joint model of power assembly suspension system rigid body and support elastomer, include: a first suspension mount, a first elastic constraint, a first rigid constraint, a second suspension mount, a second elastic constraint, a second rigid constraint, a third suspension mount, a third elastic constraint, a third rigid constraint, a powertrain mass characteristic, a powertrain centroid, a first suspension elastic center, a second suspension elastic center, a third suspension elastic center, a first fixed constraint, a second fixed constraint, and a third fixed constraint;
step S22: meshing the first suspension bracket, the second suspension bracket and the third suspension bracket;
step S23: respectively connecting the first rigid constraint, the second rigid constraint and the third rigid constraint with a power assembly side mounting point and a power assembly mass center on the suspension bracket;
step S24: connecting a first elastic constraint to a suspension side mounting point and a first suspension elastic center on a first suspension support, connecting a second elastic constraint to a suspension side mounting point and a second suspension elastic center on a second suspension support, connecting a third elastic constraint to a suspension side mounting point and a third suspension elastic center on a third suspension support, and presetting that only translational rigidity exists between connecting structures;
step S25: inputting the characteristics of the power assembly including the mass, the mass center and the rotational inertia of the power assembly without the suspension bracket into the built combined model;
step S26: the first suspended elastic center is absolutely fixed by a first fixing constraint, the second suspended elastic center is absolutely fixed by a second fixing constraint, and the third suspended elastic center is absolutely fixed by a third fixing constraint.
Furthermore, the first suspension bracket is a speed reducer front suspension bracket;
the second suspension bracket is a motor front suspension bracket;
the third suspension support is a rear suspension support of the speed reducer.
Further, in the step S22, the mesh division of the first suspension bracket, the second suspension bracket, and the third suspension bracket is implemented by using a CATIA analysis and simulation module.
Further, the specific process of evaluating the overall constrained mode calculation result in step S4 is as follows:
and (4) sequencing the natural modal frequencies from small to large according to the result obtained by calculation in the step (S3), wherein the natural modal frequencies from the first to the sixth are ranked as the rigid body modes of the power assembly, the natural modal frequencies from the seventh to the last are the elastomer modes of each suspension bracket, and the rigid body modes of the power assembly and the elastomer modes of each suspension bracket are evaluated according to the requirements of the rigid body modes of the suspension system and the elastomer modes of the suspension brackets.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a power assembly suspension system rigid body and support elastomer combined modal analysis method, which comprises the steps of establishing a combined model by taking the power assembly suspension system rigid body and the support elastomer as a whole, carrying out constrained modal calculation according to the integrated combined model, and finally evaluating the overall modal according to the obtained result.
Drawings
FIG. 1 is a block diagram of a method for analyzing joint modal of a rigid body and a support elastomer of a suspension system of a powertrain according to the present invention;
fig. 2 is a schematic structural representation of the joint modal analysis method in the powertrain suspension system according to the present invention.
In the figure:
1 a first suspension support, 2 a first elastic constraint, 3 a first rigid constraint,
4 a second suspension bracket, 5 a second elastic constraint, 6 a second rigid constraint,
7 a third suspension bracket, 8 a third elastic constraint, 9 a third rigid constraint,
10 power assembly mass characteristic, 11 power assembly mass center, 12 first suspension elastic center,
13 second suspended elastic center, 14 third suspended elastic center, 15 first fixed constraint,
16 second fixed constraint, 17 third fixed constraint.
Detailed Description
For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:
in the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The invention discloses a rigid body and support elastomer combined modal analysis method of a power assembly suspension system, which comprises the steps of establishing a combined model by taking the rigid body and the support elastomer of the power assembly suspension system as a whole, carrying out constrained modal calculation according to the integrated combined model, and finally evaluating the overall modal according to the obtained result, as shown in figures 1 and 2, the combined modal analysis method comprises the following specific steps:
step S1: collecting modal analysis parameters of the power assembly;
in step S1, the collecting process of the modal analysis parameters includes:
(1) Measuring the mass, the mass center and the moment of inertia of the power assembly without the suspension bracket;
the measurement of the mass, the mass center and the rotational inertia of the power assembly without the suspension bracket is a conventional measurement process in the prior art;
(2) Refining the 3D data of the suspension bracket;
(3) Designing the rigidity of the suspension rubber;
the specific process for designing the rigidity of the suspension rubber is as follows: combining the suspension structure form, the 3D design boundary and the power assembly mass to carry out preliminary estimation;
step S2: establishing a combined model of a rigid body and a support elastic body of a power assembly suspension system;
the step S2 specifically includes the following steps:
step S21: build the joint model of power assembly suspension system rigid body and support elastomer, include:
a first suspension mount 1, a first elastic constraint 2, a first rigid constraint 3, a second suspension mount 4, a second elastic constraint 5, a second rigid constraint 6, a third suspension mount 7, a third elastic constraint 8, a third rigid constraint 9, a locomotion assembly mass characteristic 10, a locomotion assembly centroid 11, a first suspension elastic center 12, a second suspension elastic center 13, a third suspension elastic center 14, a first fixed constraint 15, a second fixed constraint 16, and a third fixed constraint 17;
in this embodiment, the first suspension bracket 1 is a front suspension bracket of a speed reducer; the second suspension bracket 4 is a motor front suspension bracket; the third suspension bracket 7 is a rear suspension bracket of the speed reducer;
the first suspension bracket 1, the first elastic constraint 2, the first rigid constraint 3, the first suspension elastic center 12 and the first fixed constraint 15 are correspondingly matched;
the second suspension bracket 4, the second elastic constraint 5, the second rigid constraint 6, the second suspension elastic center 13 and the second fixed constraint 16 are correspondingly matched;
the third suspension bracket 7, the third elastic constraint 8, the third rigid constraint 9, the third suspension elastic center 14 and the third fixed constraint 17 are correspondingly matched;
step S22: meshing the first suspension bracket 1, the second suspension bracket 4 and the third suspension bracket 7;
in step S22, a CATIA analysis and simulation module is used for implementation;
step S23: respectively connecting a first rigid constraint 3, a second rigid constraint 6 and a third rigid constraint 9 with a power assembly side mounting point and a power assembly mass center 11 on a suspension bracket;
step S24: connecting a first elastic constraint 2 to a suspension side mounting point and a first suspension elastic center 12 on a first suspension bracket 1, connecting a second elastic constraint 5 to a suspension side mounting point and a second suspension elastic center 13 on a second suspension bracket 4, connecting a third elastic constraint 8 to a suspension side mounting point and a third suspension elastic center 14 on a third suspension bracket 7, and presetting that only translational stiffness and no torsional stiffness exist between connecting structures;
step S25: inputting the powertrain characteristics 10 into the constructed combined model;
the characteristics 10 of the powertrain include the mass, center of mass and moment of inertia of the powertrain without the suspension bracket collected in the step S1, wherein the center of mass is the center of mass 11 of the powertrain
Step S26: the first suspension elastic center 12 is absolutely fixed by a first fixing constraint 15, the second suspension elastic center 13 is absolutely fixed by a second fixing constraint 16, and the third suspension elastic center 14 is absolutely fixed by a third fixing constraint 17;
and step S3: performing overall constrained mode calculation by adopting a joint model;
and step S4: evaluating the overall constrained mode calculation result;
in step S4, according to the result obtained by calculation in step S3, the natural modal frequencies are ranked from small to large, wherein the first to sixth natural modal frequencies in ranking are the rigid body modes of the power assembly, the seventh to last natural modal frequencies are the elastomer modes of each suspension bracket, and the rigid body modes of the power assembly and the elastomer modes of each suspension bracket are evaluated according to the industry standard requirements of the rigid body modes of the suspension system and the elastomer modes of the suspension brackets.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. The rigid body and support elastomer combined modal analysis method of the power assembly suspension system is characterized in that:
the joint modal analysis method establishes a joint model by taking the rigid body and the support elastic body of the power assembly suspension system as a whole, carries out constrained modal calculation according to the whole joint model, evaluates the whole modal according to the obtained result,
the combined modal analysis method comprises the following specific steps:
step S1: collecting modal analysis parameters of the power assembly;
step S2: establishing a combined model of a rigid body and a support elastic body of a power assembly suspension system;
the specific steps of step S2 are as follows:
step S21: build the joint model of power assembly suspension system rigid body and support elastomer, include: a first suspension mount, a first elastic constraint, a first rigid constraint, a second suspension mount, a second elastic constraint, a second rigid constraint, a third suspension mount, a third elastic constraint, a third rigid constraint, a powertrain mass characteristic, a powertrain center of mass, a first suspension elastic center, a second suspension elastic center, a third suspension elastic center, a first fixed constraint, a second fixed constraint, and a third fixed constraint;
step S22: meshing the first suspension bracket, the second suspension bracket and the third suspension bracket;
step S23: respectively connecting the first rigid constraint, the second rigid constraint and the third rigid constraint with a power assembly side mounting point and a power assembly mass center on the suspension bracket;
step S24: connecting a first elastic constraint to a suspension side mounting point and a first suspension elastic center on a first suspension bracket, connecting a second elastic constraint to a suspension side mounting point and a second suspension elastic center on a second suspension bracket, connecting a third elastic constraint to a suspension side mounting point and a third suspension elastic center on a third suspension bracket, and presetting that only translational rigidity exists between connecting structures;
step S25: inputting the characteristics of the power assembly including the mass, the mass center and the rotational inertia of the power assembly without the suspension bracket into the built combined model;
step S26: the first suspension elastic center is absolutely fixed through a first fixing constraint, the second suspension elastic center is absolutely fixed through a second fixing constraint, and the third suspension elastic center is absolutely fixed through a third fixing constraint;
and step S3: performing integral constraint modal calculation by adopting a joint model;
and step S4: and evaluating the overall constrained mode calculation result.
2. The method for analyzing the joint modal of the rigid body and the bracket elastomer of the suspension system of the powertrain of claim 1, wherein:
in step S1, the collecting process of modal analysis parameters includes:
(1) Measuring the mass, the mass center and the rotational inertia of the power assembly without the suspension bracket;
(2) Refining the 3D data of the suspension support;
(3) And designing the rigidity of the suspension rubber.
3. The method for analyzing the joint modal of the rigid body and the bracket elastomer of the suspension system of the powertrain of claim 1, wherein:
the first suspension bracket is a front suspension bracket of the speed reducer;
the second suspension bracket is a motor front suspension bracket;
the third suspension support is a rear suspension support of the speed reducer.
4. The method for analyzing the joint modal of the rigid body and the bracket elastomer of the suspension system of the powertrain of claim 1, wherein:
in step S22, the first suspension bracket, the second suspension bracket, and the third suspension bracket are gridded by using a CATIA analysis and simulation module.
5. The rigid body and bracket elastomer combined modal analysis method of the powertrain suspension system of claim 1, wherein:
the specific process of evaluating the overall constrained mode calculation result in the step S4 is as follows:
and (4) sequencing the natural modal frequencies from small to large according to the result obtained by calculation in the step (S3), wherein the natural modal frequencies from the first to the sixth are ranked as the rigid body modes of the power assembly, the natural modal frequencies from the seventh to the last are the elastomer modes of each suspension bracket, and the rigid body modes of the power assembly and the elastomer modes of each suspension bracket are evaluated according to the requirements of the rigid body modes of the suspension system and the elastomer modes of the suspension brackets.
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