CN112560162A - Method and device for reducing power assembly suspension road spectrum load - Google Patents
Method and device for reducing power assembly suspension road spectrum load Download PDFInfo
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Abstract
The application discloses a method and a device for reducing power assembly suspension road spectrum load, wherein the method comprises the following steps: firstly, acquiring superposed road spectrum loads of a target power assembly suspension under various preset working conditions, then carrying out rain flow statistics on the superposed road spectrum loads to obtain a rain flow statistical matrix, calculating a peak value and a valley value of stress of each rain flow cycle in the rain flow statistical matrix and a corresponding displacement amplitude, then calculating a strain amplitude corresponding to the displacement amplitude, further calculating a first damage of the target power assembly suspension rubber according to the corresponding amplitude, and then combining a preset reduction principle to reduce the target power assembly suspension road spectrum loads. Therefore, under the condition that the structural characteristics and the rigidity nonlinear characteristic of the suspension are considered, the first damage generated by the suspension rubber is calculated, and then the preset reduction principle is combined to reduce the target power assembly suspension road spectrum load, so that the suspension road spectrum load can be effectively reduced.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a method and a device for reducing a power assembly suspension road spectrum load.
Background
Along with the high-speed development of economy and the acceleration of urbanization speed, the utilization rate of automobiles is higher and higher, and along with the increase of the driving mileage of the automobiles, the requirement on the fatigue durability of all parts of the automobiles is higher and higher. The force generated by the road excitation on a certain part of the vehicle during the running process of the vehicle is the road spectrum load of the part. In order to predict the fatigue life of the part with reliability and shorten the bench test verification period related to the fatigue performance of the part, an effective method is required to reduce the road spectrum load of the part and calculate the real damage of the part.
The suspension is used as an important element for supporting the power assembly and isolating the vibration of the power assembly on an automobile, and the fatigue durability is a key performance which is concerned by engineers because the main material of the suspension is rubber. And because the suspension has strong nonlinearity in rigidity, the strain generated when the road spectrum load is received is difficult to calculate, and further effective reduction and accurate damage calculation cannot be performed on the road spectrum load. The current common calculation mode in engineering is to assume that the suspension is a cylinder with a regular shape, and perform pseudo-damage calculation on the suspension rubber by using a method for calculating metal damage, that is, the current method only stops reducing the road spectrum load in an empirical method for equivalence by using a plurality of characteristic working condition loads, and cannot effectively reduce the suspended road spectrum load and accurately calculate the damage, so that the accuracy of a calculation result is low, the consumed resources are more, and the failure mode of the suspension in the vehicle running cannot be truly reproduced.
Therefore, how to utilize a more advanced method to effectively reduce the road spectrum load of the vehicle power assembly suspension so as to improve the accuracy of predicting the fatigue life of the suspension part and shorten the test time for truly reproducing the failure mode of the suspension in the vehicle running on the rack becomes a problem to be solved urgently.
Disclosure of Invention
The embodiment of the application mainly aims to provide a method and a device for reducing a power assembly suspension road spectrum load, which can effectively reduce the vehicle power assembly suspension road spectrum load, so as to improve the accuracy of predicting the fatigue life of a suspension part and shorten the test time for truly reproducing the failure mode of the suspension in the running process of a vehicle on a rack.
In a first aspect of the present application, a method for reducing a drive train suspension road spectrum load is provided, including:
acquiring a superposed road spectrum load of a target power assembly suspension under various preset kinds of working conditions;
carrying out rain flow statistics on the superposed road spectrum load to obtain a rain flow statistical matrix;
calculating the peak value and the valley value of each rain flow cycle pair stress in the rain flow statistical matrix;
calculating displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow cycle;
calculating a strain amplitude generated by the target powertrain suspension according to the displacement amplitude of the target powertrain suspension;
calculating first damage generated by the suspension rubber of the target power assembly according to the strain amplitude;
and reducing the target power assembly suspension road spectrum load according to the first damage and a preset reduction principle to obtain a reduction result.
In an optional implementation manner, the obtaining of the superimposed road spectrum load of the target powertrain suspension under multiple preset kinds of working conditions includes:
acquiring road spectrum load of a target power assembly suspended under each preset kind of working conditions;
and performing superposition calculation on the road spectrum load of the target power assembly suspended under each preset kind of working conditions to obtain the superposed road spectrum load.
In an optional implementation, the method further includes:
pre-drawing a three-dimensional model of the target power assembly suspension;
determining a displacement-strain curve corresponding to the target power assembly suspension according to the three-dimensional model;
calculating an amplitude of strain induced in the target powertrain mount based on the amplitude of displacement of the target powertrain mount, comprising:
and inquiring the strain amplitude corresponding to the displacement amplitude of the target power assembly suspension according to the displacement-strain curve.
In an optional implementation manner, the calculating a first damage generated by the target locomotion assembly suspension rubber according to the strain amplitude includes:
calculating the number of cycles required for rubber failure in the suspension of the target power assembly under the strain amplitude;
and calculating first damage generated by the target power assembly suspension rubber according to the number of cycles required by the failure of the rubber in the target power assembly suspension.
In an alternative implementation, the reduction principle includes:
the damage of the reduced road spectrum load to the suspension of the target power assembly is a second damage; the second lesion is 1.5 times the first lesion;
dividing the reduced road spectrum load into 4 sections; wherein, the 1 st section road spectrum load amplitude is 100% of the maximum rain flow circulation counter stress amplitude in the rain flow statistical matrix; the 2 nd section of road spectrum load amplitude is 80% of the 1 st section of road spectrum load amplitude; the 3 rd section of road spectrum load amplitude is 50% of the 1 st section of road spectrum load amplitude; the 4 th section of road spectrum load amplitude is 30% of the 1 st section of road spectrum load amplitude;
the proportion of the damage of the target power assembly suspension caused by the road spectrum load of the 1 st section in the second damage is 3%; the proportion of the damage of the target power assembly suspension caused by the 2 nd section of road spectrum load in the second damage is 7%; the proportion of the damage of the target power assembly suspension caused by the 3 rd section road spectrum load in the second damage is 10%; the proportion of the damage of the target power assembly suspension caused by the 4 th section of road spectrum load in the second damage is 80%;
the average value of the force in the reduced road spectrum load is not more than 20% of the amplitude value of the force.
Corresponding to the above-mentioned power assembly suspension way table load's reduction method, this application has proposed a power assembly suspension way table load's reduction device, includes:
the acquisition unit is used for acquiring the superposed road spectrum load of the target power assembly suspension under various preset kinds of working conditions;
the statistical unit is used for carrying out rain flow statistics on the superposed road spectrum load to obtain a rain flow statistical matrix;
the first calculation unit is used for calculating the peak value and the valley value of each rain flow cycle pair stress in the rain flow statistical matrix;
the second calculation unit is used for calculating the displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow cycle pair;
the third calculation unit is used for calculating the strain amplitude generated by the target power assembly suspension according to the displacement amplitude of the target power assembly suspension;
the fourth calculating unit is used for calculating first damage generated by the suspension rubber of the target power assembly according to the strain amplitude;
and the reducing unit is used for reducing the target power assembly suspension road spectrum load according to the first damage and a preset reducing principle to obtain a reducing result.
In an optional implementation manner, the obtaining unit includes:
the acquisition subunit is used for acquiring the road spectrum load of the target power assembly suspended under each preset kind of working conditions;
and the superposition subunit is used for carrying out superposition calculation on the road spectrum load of the target power assembly suspended under each preset kind of working conditions to obtain the superposed road spectrum load.
In an optional implementation, the apparatus further includes:
the drawing unit is used for pre-drawing a three-dimensional model of the target power assembly suspension;
the determining unit is used for determining a displacement-strain curve corresponding to the target power assembly suspension according to the three-dimensional model;
the third computing unit is specifically configured to:
and inquiring the strain amplitude corresponding to the displacement amplitude of the target power assembly suspension according to the displacement-strain curve.
In an optional implementation manner, the fourth computing unit includes:
the cycle number calculating subunit is used for calculating the cycle number required by rubber failure in the target power assembly suspension under the strain amplitude;
and the first damage calculating subunit is used for calculating the first damage generated by the rubber of the target power assembly suspension according to the cycle number required by the failure of the rubber in the target power assembly suspension.
In an alternative implementation, the reduction principle includes:
the damage of the reduced road spectrum load to the suspension of the target power assembly is a second damage; the second lesion is 1.5 times the first lesion;
dividing the reduced road spectrum load into 4 sections; wherein, the 1 st section road spectrum load amplitude is 100% of the maximum rain flow circulation counter stress amplitude in the rain flow statistical matrix; the 2 nd section of road spectrum load amplitude is 80% of the 1 st section of road spectrum load amplitude; the 3 rd section of road spectrum load amplitude is 50% of the 1 st section of road spectrum load amplitude; the 4 th section of road spectrum load amplitude is 30% of the 1 st section of road spectrum load amplitude;
the proportion of the damage of the target power assembly suspension caused by the road spectrum load of the 1 st section in the second damage is 3%; the proportion of the damage of the target power assembly suspension caused by the 2 nd section of road spectrum load in the second damage is 7%; the proportion of the damage of the target power assembly suspension caused by the 3 rd section road spectrum load in the second damage is 10%; the proportion of the damage of the target power assembly suspension caused by the 4 th section of road spectrum load in the second damage is 80%;
the average value of the force in the reduced road spectrum load is not more than 20% of the amplitude value of the force.
Therefore, the embodiment of the application has the following beneficial effects:
the embodiment of the application provides a method and a device for reducing power assembly suspension road spectrum load, firstly acquiring the superposed road spectrum load of a target power assembly suspension under various preset kinds of working conditions, then carrying out rain flow statistics on the superposed road spectrum load to obtain a rain flow statistical matrix, and calculating the peak value and the valley value of each rain flow cycle pair stress in the rain flow statistical matrix, then, the displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow circulation is calculated, and further, according to the displacement amplitude, the strain amplitude generated by the suspension of the target power assembly can be calculated, then according to the strain amplitude, the first damage generated by the suspension rubber of the target power assembly can be calculated, and finally, according to the first damage and a preset reduction principle, the road spectrum load of the suspension of the target power assembly can be reduced, and a reduction result is obtained. It can be seen that when the power assembly suspended road spectrum load is reduced, under the condition that the structural characteristics and the rigidity nonlinear characteristic of the suspension are considered, the first damage generated by the suspension rubber is calculated firstly, then the target power assembly suspended road spectrum load is reduced according to the first damage and the preset reduction principle, so that the effective reduction of the suspended road spectrum load is realized, the accuracy of predicting the fatigue life of the suspended part is improved, and the test time for truly reproducing the failure mode of the suspension in the running process of the vehicle on the rack is shortened.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for reducing a power train suspension road spectrum load according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a target power assembly suspended road spectrum load collected in one cycle under a certain preset kind of working conditions according to the embodiment of the present application;
FIG. 3 is a schematic diagram of a rain flow statistics matrix according to an embodiment of the present disclosure;
FIG. 4 is a schematic illustration of a force-displacement curve of a target powertrain mount provided by an embodiment of the present application;
FIG. 5 is a schematic diagram of a statistical matrix of displacement amplitudes of a target locomotion assembly suspension provided by an embodiment of the present application;
FIG. 6 is a schematic diagram of a three-dimensional model of a target powertrain suspension rubber provided by an embodiment of the present application;
FIG. 7 is a schematic diagram of a target powertrain mount finite element computational boundary condition provided by an embodiment of the present application;
FIG. 8 is a graphical illustration of a displacement-strain curve corresponding to a target locomotion assembly suspension provided by an embodiment of the present application;
FIG. 9 is a schematic illustration of an E-N curve corresponding to a target powertrain mount provided by an embodiment of the present application;
FIG. 10 is a schematic illustration of a first damage matrix of a target locomotion assembly suspension provided by an embodiment of the present application;
FIG. 11 is a flowchart illustrating a method for reducing a powertrain mount road spectrum load according to an embodiment of the present disclosure;
fig. 12 is a schematic diagram of a power train suspension road spectrum load reduction device according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As described in the background, as the mileage of a vehicle increases, the fatigue durability of various components of the vehicle is required to be higher. In order to predict the reliability of the fatigue life of a vehicle part and shorten the bench test verification period related to the fatigue performance of the part, an effective method is required to reduce the road spectrum load of the part and calculate the real damage of the part.
However, the existing calculation method usually assumes that the suspension is a cylinder with a regular shape, and performs pseudo-damage calculation on the suspension rubber by using a method for calculating metal damage, that is, the existing method only stops reducing the road spectrum load in an empirical method for equivalence by using a few characteristic working condition loads, and cannot effectively reduce the suspended road spectrum load and accurately calculate the damage, so that the accuracy of the calculation result is low, the consumed resources are more, and the failure mode of the suspension in the vehicle running cannot be truly reproduced.
Based on the method and the device, the effective reduction of the vehicle power assembly suspension road spectrum load can be realized, the accuracy of predicting the fatigue life of the suspension part is improved, and the test time of truly reproducing the failure mode of the suspension in the vehicle running process on the rack is shortened.
The method for reducing the power train suspension road spectrum load provided by the embodiment of the application is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, which shows a flowchart of an embodiment of a method for reducing a drive train suspension road spectrum load provided in an embodiment of the present application, the embodiment may include the following steps:
s101: and acquiring the superposed road spectrum load of the target power assembly suspension under various preset kinds of working conditions.
In the present embodiment, the powertrain mount that needs to perform the curtailed road spectrum load is defined as a target powertrain mount, and the vehicle to which the target powertrain mount belongs is defined as a target vehicle. In practical application, in order to effectively reduce the power assembly suspension road spectrum load, firstly, in the actual vehicle road test process, various working conditions, such as emergency braking, rapid acceleration starting, high-speed simulation, large-angle climbing and the like, need to be preset to simulate the actual vehicle using condition of a target vehicle, and the superposed road spectrum load of the target power assembly suspension under the preset various working conditions is obtained.
Specifically, an optional implementation manner is that the implementation process of this step S101 may specifically include the following steps a1-a 2:
and A1, acquiring the road spectrum load of the suspension of the target power assembly under each preset kind of working conditions.
In this implementation manner, in order to effectively reduce the power assembly suspension road spectrum load, a target driving process of multiple cycles performed under various preset kinds of working conditions needs to be simulated in the actual vehicle road test process, and the road spectrum load of the target power assembly suspension under each preset kind of working conditions is collected.
Specifically, in order to shorten the suspension road spectrum load acquisition period, only the road spectrum load of the target power assembly suspension in one cycle is acquired under each preset kind of working condition, as shown in fig. 2, which shows a schematic diagram of the road spectrum load of the target power assembly suspension acquired in one cycle under a certain preset kind of working condition provided by the embodiment of the present application.
For example, the following steps are carried out: in an actual test, if it is calculated that a user needs to climb a heavy slope 100 times in the 10-year use process of a target vehicle, the target vehicle needs to be simulated to repeatedly climb the heavy slope 100 times during the test, that is, 100 cycles are performed under the working condition. However, when the road spectrum load is acquired, the road spectrum data does not need to be acquired in 100 cycles, and because the data is the same in each cycle, only the road spectrum load suspended by the target power assembly in one cycle is acquired.
And A2, carrying out superposition calculation on the road spectrum load of the target power assembly suspended under each preset type working condition to obtain the superposed road spectrum load.
After the road spectrum load of the target power assembly suspension under each preset type of working condition is collected through the step a1, in order to obtain the whole road spectrum load of the target power assembly suspension, the road spectrum load of the target power assembly suspension under each preset type of working condition needs to be superposed, and a specific superposition formula is as follows:
wherein, FtotalRepresenting the overall road spectrum load of the target powertrain suspension; fiRepresenting the road spectrum load of the target power assembly suspension collected in one cycle under the ith preset type working condition; ciAnd indicating the cycle times corresponding to the ith preset type working condition.
S102: and carrying out rain flow statistics on the superposed road spectrum load to obtain a rain flow statistical matrix.
In this embodiment, after the step S101 calculates the superimposed road spectrum load of the target powertrain suspension under various preset kinds of working conditions, since the road spectrum load of the target powertrain suspension is a random load and has no obvious law, for the convenience of subsequent analysis and calculation, it is first necessary to perform rain flow statistics on the acquired superimposed road spectrum load by using a two-parameter rain flow method to obtain a rain flow statistics matrix, as shown in fig. 3. Wherein, the double parameters refer to the amplitude and the mean value of the road spectrum load. In the rain flow statistical matrix shown in fig. 3, each row of data represents a mean value of the road spectrum load, each column of data represents an amplitude value of the road spectrum load, and each element in the rain flow statistical matrix represents a cycle number under a condition of the corresponding mean value and amplitude value.
In practical application, the obtained superposed road spectrum load can be led into nCode software, rain flow statistics is performed on the superposed road spectrum load by using a rainflow module in the software, a rain flow statistical matrix is obtained, the specific calculation process is consistent with the existing mode, and details are not repeated here.
S103: and calculating the peak value and the valley value of each rain flow cycle pair stress in the rain flow statistical matrix.
In this embodiment, after the rain flow statistical matrix is obtained in step S102, based on that the result of the rain flow statistics appears in the form of the road spectrum load amplitude and the mean value in the rain flow statistical matrix, in order to calculate the damage of the road spectrum load after the rain flow statistics on the suspension rubber, the peak value and the valley value of the stress of each rain flow cycle in the rain flow statistical matrix may be calculated first for performing subsequent analysis and calculation. Wherein, the peak value and the valley value calculation formula of each rain flow circulation to stress are as follows:
in practical application, the acquired data in the rain flow statistical matrix can be imported into excel, and calculation is performed in excel, and the specific calculation process is consistent with the existing mode and is not repeated herein.
S104: and calculating the displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow cycle.
In this embodiment, after the peak value and the valley value of each rain flow cycle pair stress in the rain flow statistical matrix are calculated in step S103, the displacement amplitude of the target powertrain mount corresponding to the peak value and the valley value of each rain flow cycle pair stress can be further calculated.
Specifically, since the deformation amount of the target powertrain suspension when receiving a certain load is determined by the stiffness of the target powertrain suspension, the stiffness of the suspension rubber needs to have strong nonlinearity in order to ensure that the vibration generated by the powertrain can be attenuated while controlling the displacement amount of the powertrain in the front compartment of the automobile.
Based on this, when calculating the displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow cycle, firstly, the rigidity test needs to be performed on the target power assembly suspension rubber to obtain a force-displacement curve of the target power assembly suspension, as shown in fig. 4, wherein the abscissa represents displacement (mm) and the ordinate represents force (N). The specific acquisition process comprises the following steps: firstly, a target power assembly is mounted on MTS380 equipment through a tool, the equipment applies force to the target power assembly according to requirements, and the force applied by the equipment and the displacement generated by the target power assembly are recorded. The conditions and force loading requirements at the time of the experiment were as follows:
ambient temperature: 23 +/-3 ℃; MTS380 applied load: -7000N to + 7000N; the loading speed is less than 3 mm/min; the target power assembly is suspended in a room temperature environment and stands for more than 4 hours before testing; pre-circulating loading is needed for more than 3 times before formal experiments, and the 4 th time begins to record numerical values; at least 4 sets of data were recorded and averaged to obtain the force-displacement curve of the target locomotion assembly suspension.
In the diagram of the force-displacement curve shown in fig. 4, the ordinate represents the force applied by the MTS and the abscissa represents the displacement of the target powertrain mount. At this time, the peak and the valley of the rain flow statistical matrix calculated in step S103 for each rain flow cycle versus stress are substituted into the force-displacement curve shown in fig. 4, so that the actual displacement of the target powertrain can be calculated for each rain flow cycle versus stress. Then, the peak force of each rain flow cycle stress is subtracted from the displacement corresponding to the valley force, so as to obtain the displacement amplitude of the target power assembly suspension under the rain flow cycle stress, and based on the displacement amplitude, a statistical matrix of the displacement amplitude of the target power assembly suspension can be calculated, as shown in fig. 5.
S105: and calculating the strain amplitude generated by the target power assembly suspension according to the displacement amplitude of the target power assembly suspension.
In this embodiment, after the displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow cycle is calculated in step S104, the strain amplitude generated by the target power assembly suspension can be further calculated according to the displacement amplitude of the target power assembly suspension.
Specifically, before performing step S105, the present embodiment may perform the following steps B1-B2:
and step B1, pre-drawing a three-dimensional model of the suspension of the target power assembly.
In this implementation, in order to calculate the magnitude of the strain generated by the target powertrain mount, a three-dimensional model of the target powertrain mount rubber may be first drawn by using existing or future drawing software, as shown in fig. 6, where the error between the design size of the three-dimensional model and the actual mount rubber should not exceed 1%.
And step B2, determining a displacement-strain curve corresponding to the suspension of the target power assembly according to the three-dimensional model.
After the three-dimensional model of the target power assembly suspension is pre-drawn through the step B1, the three-dimensional model may be further introduced into Computer Aided Engineering (CAE) software, a fixed constraint is applied to a portion of the target power assembly suspension rubber, which is connected to the metal housing, outside the rubber, and a portion of the target power assembly suspension rubber, which is connected to the metal frame, is coupled to an elastic center point of the rubber portion, and a force is applied to the elastic center point, as shown in fig. 7, an amplitude and a speed of the applied force are consistent with experimental conditions, so that a displacement-strain curve corresponding to the target power assembly suspension may be obtained through simulation, as shown in fig. 8.
Based on this, the specific implementation process of step S105 may include: and inquiring the strain amplitude corresponding to the displacement amplitude of the suspension of the target power assembly according to the displacement-strain curve.
Specifically, after the displacement-strain curve corresponding to the target powertrain suspension is determined through the step B2, the strain amplitude corresponding to the displacement amplitude of the target powertrain suspension can be further searched in the curve.
S106: and calculating first damage generated by the suspension rubber of the target power assembly according to the strain amplitude.
In this embodiment, after the strain amplitude generated by the target powertrain mount is calculated in step S105, the damage generated by the target powertrain mount rubber at the strain amplitude can be further calculated and defined as the first damage.
Specifically, an optional implementation manner is that the implementation process of this step S106 may specifically include the following steps C1-C2:
and C1, calculating the cycle number required by the rubber in the target power assembly suspension to fail under the strain amplitude.
In this implementation, after the strain amplitude generated by the target powertrain suspension is calculated in step S105, the number of cycles required for rubber failure in the target powertrain suspension at the strain amplitude may be further found according to a pre-constructed E-N curve shown in fig. 9, where an abscissa N in fig. 9 represents the number of cycles required for rubber failure in the target powertrain suspension, and an ordinate E represents the strain amplitude generated by the target powertrain suspension.
For example, the following steps are carried out: as shown in FIG. 9, assume that the magnitude of the strain induced in the target powertrain mount is E under certain rain cycle vs. peak and valley stresses0Then, on the E-N curve shown in FIG. 9, it can be looked upInquires out at E0The number of cycles required for rubber failure in the lower target powertrain suspension is N0。
And C2, calculating the first damage generated by the rubber of the target power assembly suspension according to the circulation times required by the failure of the rubber in the target power assembly suspension.
After the number of cycles required for the rubber to fail in the suspension of the target locomotion assembly is calculated through the step C1, the first damage generated by the suspension rubber of the target locomotion assembly is further calculated according to the number of cycles.
For example, the following steps are carried out: based on the above example in step C1, assume that at the strain amplitude E0The number of cycles required for rubber failure in the lower target powertrain suspension is N0And if the number of actual cycles under the peak and valley forces in the entire suspended load path spectrum is NsThe damage to the target powertrain mount from the peak and valley forces is then Ns/N0。
By analogy, the damage of all the rain flow cycles to the stress on the target power assembly suspension in fig. 3 can be calculated by using the method, the damage is calculated in a superposition manner, the total damage generated by the target power assembly suspension is obtained and is used as the first damage, and the corresponding damage matrix is shown in fig. 10.
S107: and reducing the target power assembly suspension road spectrum load according to the first damage and a preset reduction principle to obtain a reduction result.
In this embodiment, after the first damage generated by the target powertrain suspension rubber is calculated in step S106, the target powertrain suspension road spectrum load can be further reduced according to the first damage and a preset reduction principle, so as to obtain a reduction result.
In an alternative implementation manner, the reduction principle may include the following 3 items:
(1) the damage of the reduced road spectrum load to the suspension of the target power assembly is a second damage; wherein the second lesion is 1.5 times the first lesion.
In this implementation, a reduction principle is preset as follows: the damage of the reduced road spectrum load to the suspension of the target power assembly is 1.5 times of the first damage, and the damage is defined as a second damage.
(2) Dividing the reduced road spectrum load into 4 sections; wherein, the 1 st section road spectrum load amplitude is 100% of the maximum rain flow circulation counter stress amplitude in the rain flow statistical matrix; the 2 nd section of road spectrum load amplitude is 80% of the 1 st section of road spectrum load amplitude; the 3 rd section of road spectrum load amplitude is 50% of the 1 st section of road spectrum load amplitude; the 4 th section of road spectrum load amplitude is 30% of the 1 st section of road spectrum load amplitude.
In addition, the proportion of the damage of the 1 st section of road spectrum load to the suspension of the target power assembly in the second damage is 3 percent; the proportion of the damage generated by the 2 nd section of road spectrum load to the suspension of the target power assembly in the second damage is 7 percent; the proportion of the damage generated by the 3 rd section road spectrum load to the suspension of the target power assembly in the second damage is 10 percent; the damage of the 4 th section of road spectrum load to the suspension of the target power assembly accounts for 80% of the second damage.
(3) The mean value of the force in the reduced road spectrum load is not more than 20% of the amplitude value.
For example, the following steps are carried out: based on the above-mentioned 3 reduction rules, assuming that the first damage calculated in step S106 is 1.0, the damage caused by the reduced road spectrum load is 1.5, that is, the second damage is 1.5, according to the reduction rule (1). And assuming that the maximum amplitude of the acquired road spectrum load force is-8000 to 8000N, the 1 st section of road spectrum load is-8000N to 8000N, namely the span from the maximum force to the minimum force is 16000N. According to the reduction principle (2), the span from the maximum force to the minimum force of the 2 nd road spectrum load is 16000 × 80% ═ 12800N; the span of the 3 rd section spectrum load from the maximum force to the minimum force is 16000 x 50 percent to 8000N; the span of the 4 th section spectrum load from the maximum force to the minimum force is 16000 × 30% ═ 4800N. The force amplitude of the load after each reduction is thus determined. Then, according to the reduction principle (2), the damage generated by the 1 st section of road spectrum load can be calculated as: 1.5 × 3% ═ 0.045. The 1 st section of road spectrum load calculated by combining the method is that the damage generated by one cycle of-8000N to 8000N is N1Then divide by N by 0.0451The number of cycles required for the 1 st section of road spectrum loading can be calculated. And so on, the same treatment can be carried out on the 2 nd-4 th section road spectrum load. The reduced four-segment road spectrum load force and the related cycle number are shown in the following table 1:
| serial number | Minimum value (N) | Maximum value (N) | Number of cycles |
| Road spectrum load of 1 st section | -8000 | 8000 | 300 |
| |
-6800 | 6000 | 4000 |
| Road spectrum load of 3 rd section | -3500 | 4500 | 10000 |
| 4 th section road spectrum load | -1800 | 3000 | 300000 |
TABLE 1
It should be noted that, by the method, effective reduction of the target powertrain suspension road spectrum load can be realized, so that the failure mode of the suspension in the vehicle running can be truly reproduced in about one day on the rack, and in the traditional method, in order to truly reproduce the failure mode of the suspension in the vehicle running in a laboratory (on a test rack), fatigue test for two weeks needs to be carried out on the rack.
To sum up, the method for reducing the power assembly suspension road spectrum load provided by the embodiment of the application firstly obtains the superposed road spectrum load of the target power assembly suspension under various preset kinds of working conditions, then carrying out rain flow statistics on the superposed road spectrum load to obtain a rain flow statistical matrix, and calculating the peak value and the valley value of each rain flow cycle pair stress in the rain flow statistical matrix, then, the displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow circulation is calculated, and further, according to the displacement amplitude, the strain amplitude generated by the suspension of the target power assembly can be calculated, then according to the strain amplitude, the first damage generated by the suspension rubber of the target power assembly can be calculated, and finally, according to the first damage and a preset reduction principle, the road spectrum load of the suspension of the target power assembly can be reduced, and a reduction result is obtained. It can be seen that when the power assembly suspended road spectrum load is reduced, under the condition that the structural characteristics and the rigidity nonlinear characteristic of the suspension are considered, the first damage generated by the suspension rubber is calculated firstly, then the target power assembly suspended road spectrum load is reduced according to the first damage and the preset reduction principle, so that the effective reduction of the suspended road spectrum load is realized, the accuracy of predicting the fatigue life of the suspended part is improved, and the test time for truly reproducing the failure mode of the suspension in the running process of the vehicle on the rack is shortened.
For ease of understanding, an overall flow chart of a method of powertrain mounted road spectrum load reduction is now presented in connection with FIG. 11. The implementation process of the method for reducing the power assembly suspension road spectrum load provided by the embodiment of the application is introduced.
As shown in fig. 11, the implementation process of the embodiment of the present application is as follows: firstly, acquiring superposed road spectrum loads of a target power assembly suspension under various preset working conditions, then carrying out rain flow statistics on the superposed road spectrum loads to obtain a rain flow statistical matrix, then calculating a peak value force matrix and a valley value force matrix of each rain flow cycle counter stress according to a mean value and an amplitude value in the rain flow statistical matrix, calculating a displacement amplitude value of the target power assembly suspension corresponding to the peak value and the valley value of each rain flow cycle counter stress through a suspension rigidity curve, then calculating a strain amplitude value under the displacement amplitude value of the target power assembly suspension corresponding to the peak value force matrix and the valley value force matrix by using CAE (computer aided engineering), wherein strain tension can be defined as positive, stress can be defined as negative, then calculating the cycle number required by rubber failure in the target power assembly suspension according to the strain amplitude value, and further calculating the cycle number required by rubber failure in the target power assembly suspension and an E-N curve, the first damage generated by the suspension rubber of the target power assembly can be calculated, finally, the road spectrum load of the suspension rubber of the target power assembly is reduced according to the first damage and a preset reduction principle, a reduction result is obtained, the bench test load after the road spectrum reduction can be calculated, and the specific implementation process is shown in step S101-step S107.
The above embodiments describe the technical solution of the method of the present application in detail, and accordingly, the present application further provides a power train suspension road spectrum load reduction device, which is described below.
Referring to fig. 12, fig. 12 is a structural diagram of a power train suspension road spectrum load reduction device provided in an embodiment of the present application, and as shown in fig. 12, the device includes:
the acquiring unit 1201 is used for acquiring the superposed road spectrum load of the target power assembly suspension under various preset kinds of working conditions;
a statistical unit 1202, configured to perform rain flow statistics on the superimposed road spectrum load to obtain a rain flow statistical matrix;
a first calculating unit 1203, configured to calculate a peak value and a valley value of each rain flow cycle pair stress in the rain flow statistical matrix;
a second calculating unit 1204, configured to calculate a displacement amplitude of the target powertrain mount corresponding to a peak and a valley of the stress of each of the rain flow cycles;
a third calculating unit 1205 for calculating a strain amplitude generated by the target powertrain suspension according to the displacement amplitude of the target powertrain suspension;
a fourth calculating unit 1206, configured to calculate a first damage generated by the suspension rubber of the target powertrain according to the strain amplitude;
a reducing unit 1207, configured to reduce the target powertrain suspension road spectrum load according to the first damage and a preset reducing principle, so as to obtain a reducing result.
In some possible implementations of the present application, the obtaining unit 1201 includes:
the acquisition subunit is used for acquiring the road spectrum load of the target power assembly suspended under each preset kind of working conditions;
and the superposition subunit is used for carrying out superposition calculation on the road spectrum load of the target power assembly suspended under each preset kind of working conditions to obtain the superposed road spectrum load.
In some possible implementations of the present application, the apparatus further includes:
the drawing unit is used for pre-drawing a three-dimensional model of the target power assembly suspension;
the determining unit is used for determining a displacement-strain curve corresponding to the target power assembly suspension according to the three-dimensional model;
the third calculation unit 1205 is specifically configured to:
and inquiring the strain amplitude corresponding to the displacement amplitude of the target power assembly suspension according to the displacement-strain curve.
In some possible implementations of the present application, the fourth calculating unit 1206 includes:
the cycle number calculating subunit is used for calculating the cycle number required by rubber failure in the target power assembly suspension under the strain amplitude;
and the first damage calculating subunit is used for calculating the first damage generated by the rubber of the target power assembly suspension according to the cycle number required by the failure of the rubber in the target power assembly suspension.
In some possible implementations of the present application, the reduction principle includes:
the damage of the reduced road spectrum load to the suspension of the target power assembly is a second damage; the above-mentioned
The second lesion is 1.5 times the first lesion;
dividing the reduced road spectrum load into 4 sections; wherein, the 1 st section road spectrum load amplitude is 100% of the maximum rain flow circulation counter stress amplitude in the rain flow statistical matrix; the 2 nd section of road spectrum load amplitude is 80% of the 1 st section of road spectrum load amplitude; the 3 rd section of road spectrum load amplitude is 50% of the 1 st section of road spectrum load amplitude; the 4 th section of road spectrum load amplitude is 30% of the 1 st section of road spectrum load amplitude;
the proportion of the damage of the target power assembly suspension caused by the road spectrum load of the 1 st section in the second damage is 3%; the proportion of the damage of the target power assembly suspension caused by the 2 nd section of road spectrum load in the second damage is 7%; the proportion of the damage of the target power assembly suspension caused by the 3 rd section road spectrum load in the second damage is 10%; the proportion of the damage of the target power assembly suspension caused by the 4 th section of road spectrum load in the second damage is 80%;
the average value of the force in the reduced road spectrum load is not more than 20% of the amplitude value of the force.
It can be seen from the foregoing embodiments that, the device for reducing power assembly suspension road spectrum load provided in this application embodiment first obtains a superimposed road spectrum load of a target power assembly suspension under multiple preset kinds of working conditions, then performs rain flow statistics on the superimposed road spectrum load to obtain a rain flow statistical matrix, and calculates a peak value and a valley value of each rain flow cycle pair stress in the rain flow statistical matrix, then calculates a displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of each rain flow cycle pair stress, and further calculates a strain amplitude generated by the target power assembly suspension according to the displacement amplitude, and then calculates a first damage generated by a target power assembly suspension rubber according to the strain amplitude, and finally reduces the target power assembly suspension road spectrum load according to the first damage and a preset reduction principle, a reduction result is obtained. It can be seen that when the power assembly suspended road spectrum load is reduced, under the condition that the structural characteristics and the rigidity nonlinear characteristic of the suspension are considered, the first damage generated by the suspension rubber is calculated firstly, then the target power assembly suspended road spectrum load is reduced according to the first damage and the preset reduction principle, so that the effective reduction of the suspended road spectrum load is realized, the accuracy of predicting the fatigue life of the suspended part is improved, and the test time for truly reproducing the failure mode of the suspension in the running process of the vehicle on the rack is shortened.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for reducing a power assembly suspension road spectrum load is characterized by comprising the following steps:
acquiring a superposed road spectrum load of a target power assembly suspension under various preset kinds of working conditions;
carrying out rain flow statistics on the superposed road spectrum load to obtain a rain flow statistical matrix;
calculating the peak value and the valley value of each rain flow cycle pair stress in the rain flow statistical matrix;
calculating displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow cycle;
calculating a strain amplitude generated by the target powertrain suspension according to the displacement amplitude of the target powertrain suspension;
calculating first damage generated by the suspension rubber of the target power assembly according to the strain amplitude;
and reducing the target power assembly suspension road spectrum load according to the first damage and a preset reduction principle to obtain a reduction result.
2. The method of claim 1, wherein the obtaining of the superimposed road spectrum load of the target powertrain suspension under a plurality of preset kinds of operating conditions comprises:
acquiring road spectrum load of a target power assembly suspended under each preset kind of working conditions;
and performing superposition calculation on the road spectrum load of the target power assembly suspended under each preset kind of working conditions to obtain the superposed road spectrum load.
3. The method of claim 1, further comprising:
pre-drawing a three-dimensional model of the target power assembly suspension;
determining a displacement-strain curve corresponding to the target power assembly suspension according to the three-dimensional model;
calculating an amplitude of strain induced in the target powertrain mount based on the amplitude of displacement of the target powertrain mount, comprising:
and inquiring the strain amplitude corresponding to the displacement amplitude of the target power assembly suspension according to the displacement-strain curve.
4. The method of claim 1, wherein calculating a first damage to the target locomotion assembly suspension rubber from the strain amplitude comprises:
calculating the number of cycles required for rubber failure in the suspension of the target power assembly under the strain amplitude;
and calculating first damage generated by the target power assembly suspension rubber according to the number of cycles required by the failure of the rubber in the target power assembly suspension.
5. The method of claim 1, wherein the reduction principle comprises:
the damage of the reduced road spectrum load to the suspension of the target power assembly is a second damage; the second lesion is 1.5 times the first lesion;
dividing the reduced road spectrum load into 4 sections; wherein, the 1 st section road spectrum load amplitude is 100% of the maximum rain flow circulation counter stress amplitude in the rain flow statistical matrix; the 2 nd section of road spectrum load amplitude is 80% of the 1 st section of road spectrum load amplitude; the 3 rd section of road spectrum load amplitude is 50% of the 1 st section of road spectrum load amplitude; the 4 th section of road spectrum load amplitude is 30% of the 1 st section of road spectrum load amplitude;
the proportion of the damage of the target power assembly suspension caused by the road spectrum load of the 1 st section in the second damage is 3%; the proportion of the damage of the target power assembly suspension caused by the 2 nd section of road spectrum load in the second damage is 7%; the proportion of the damage of the target power assembly suspension caused by the 3 rd section road spectrum load in the second damage is 10%; the proportion of the damage of the target power assembly suspension caused by the 4 th section of road spectrum load in the second damage is 80%;
the average value of the force in the reduced road spectrum load is not more than 20% of the amplitude value of the force.
6. A powertrain mount road spectrum load reduction device, comprising:
the acquisition unit is used for acquiring the superposed road spectrum load of the target power assembly suspension under various preset kinds of working conditions;
the statistical unit is used for carrying out rain flow statistics on the superposed road spectrum load to obtain a rain flow statistical matrix;
the first calculation unit is used for calculating the peak value and the valley value of each rain flow cycle pair stress in the rain flow statistical matrix;
the second calculation unit is used for calculating the displacement amplitude of the target power assembly suspension corresponding to the peak value and the valley value of the stress of each rain flow cycle pair;
the third calculation unit is used for calculating the strain amplitude generated by the target power assembly suspension according to the displacement amplitude of the target power assembly suspension;
the fourth calculating unit is used for calculating first damage generated by the suspension rubber of the target power assembly according to the strain amplitude;
and the reducing unit is used for reducing the target power assembly suspension road spectrum load according to the first damage and a preset reducing principle to obtain a reducing result.
7. The apparatus of claim 6, wherein the obtaining unit comprises:
the acquisition subunit is used for acquiring the road spectrum load of the target power assembly suspended under each preset kind of working conditions;
and the superposition subunit is used for carrying out superposition calculation on the road spectrum load of the target power assembly suspended under each preset kind of working conditions to obtain the superposed road spectrum load.
8. The apparatus of claim 6, further comprising:
the drawing unit is used for pre-drawing a three-dimensional model of the target power assembly suspension;
the determining unit is used for determining a displacement-strain curve corresponding to the target power assembly suspension according to the three-dimensional model;
the third computing unit is specifically configured to:
and inquiring the strain amplitude corresponding to the displacement amplitude of the target power assembly suspension according to the displacement-strain curve.
9. The apparatus of claim 6, wherein the fourth computing unit comprises:
the cycle number calculating subunit is used for calculating the cycle number required by rubber failure in the target power assembly suspension under the strain amplitude;
and the first damage calculating subunit is used for calculating the first damage generated by the rubber of the target power assembly suspension according to the cycle number required by the failure of the rubber in the target power assembly suspension.
10. The apparatus of claim 6, wherein the reduction principle comprises:
the damage of the reduced road spectrum load to the suspension of the target power assembly is a second damage; the second lesion is 1.5 times the first lesion;
dividing the reduced road spectrum load into 4 sections; wherein, the 1 st section road spectrum load amplitude is 100% of the maximum rain flow circulation counter stress amplitude in the rain flow statistical matrix; the 2 nd section of road spectrum load amplitude is 80% of the 1 st section of road spectrum load amplitude; the 3 rd section of road spectrum load amplitude is 50% of the 1 st section of road spectrum load amplitude; the 4 th section of road spectrum load amplitude is 30% of the 1 st section of road spectrum load amplitude;
the proportion of the damage of the target power assembly suspension caused by the road spectrum load of the 1 st section in the second damage is 3%; the proportion of the damage of the target power assembly suspension caused by the 2 nd section of road spectrum load in the second damage is 7%; the proportion of the damage of the target power assembly suspension caused by the 3 rd section road spectrum load in the second damage is 10%; the proportion of the damage of the target power assembly suspension caused by the 4 th section of road spectrum load in the second damage is 80%;
the average value of the force in the reduced road spectrum load is not more than 20% of the amplitude value of the force.
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|---|---|---|---|
| CN201910906960.7A CN112560162B (en) | 2019-09-24 | Method and device for reducing suspended road spectrum load of power assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910906960.7A CN112560162B (en) | 2019-09-24 | Method and device for reducing suspended road spectrum load of power assembly |
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| CN112560162A true CN112560162A (en) | 2021-03-26 |
| CN112560162B CN112560162B (en) | 2024-05-10 |
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