CN114429000A - Method, system and equipment for predicting dynamic unbalance finished automobile response of transmission system - Google Patents
Method, system and equipment for predicting dynamic unbalance finished automobile response of transmission system Download PDFInfo
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Abstract
The invention provides a method, a system and equipment for predicting the response of a dynamic unbalance whole vehicle of a transmission system, wherein the method comprises the following steps: acquiring the dynamic unbalance amount of each transmission part and each connecting piece at the corresponding preset equivalent end surface; calculating the equivalent dynamic unbalance amount of each preset equivalent end face according to the dynamic unbalance amount of each transmission part and each connecting piece at the corresponding preset equivalent end face; and calculating the total noise or the total vibration generated by the equivalent dynamic unbalance at each preset response point of the whole vehicle. The invention can effectively and accurately predict the influence of the total unbalance of the transmission system with larger dispersion on the noise or vibration response of the whole vehicle, can realize that the noise and vibration of the whole vehicle which are most concerned by customers are taken as a guide target, comprehensively considers the influence of the dynamic unbalance of each component and the sensitivity of the whole vehicle on the customer perception in the early stage of a project, and reasonably decomposes the dynamic unbalance of the components and the sensitivity target of the whole vehicle by combining cost factors.
Description
Technical Field
The invention relates to the technical field of vibration and noise control (NVH), in particular to a method, a system and equipment for predicting the response of a whole vehicle with dynamic unbalance of a transmission system.
Background
Consumers and automobile manufacturers are increasingly concerned with noise and vibration in four-drive and rear-drive trains. The transmission components such as a transmission shaft, a transfer case, a speed changer, a drive axle and the like have certain dynamic unbalance problems due to manufacturing, design, assembly and the like. In high-speed rotation, the dynamic unbalance of the transmission system can generate huge rotating centrifugal force to act on the transmission system, and noise and vibration which can be sensed by human bodies are generated through the support points of the transmission system and the vehicle body.
To effectively control this problem, the dynamic unbalance mass of the transmission system and the sensitivity of the whole vehicle need to be matched and controlled. Because the unbalanced mass of the components has dispersion, and the vector superposition of the unbalanced mass of the components has randomness during assembly, the total unbalanced mass of the transmission system has larger dispersion.
The dynamic unbalance of the transmission system cannot be eliminated, the dynamic unbalance can only be controlled within a certain range, and the higher the control requirement is, the higher the manufacturing cost is. In order to meet the requirements of mass production and low cost of automobiles, a statistical prediction method of noise and vibration generated by dynamic unbalance of a transmission system is urgently needed, so that design reference is provided for designers, and the designers can better seek a proper balance point between NVH (noise, vibration and harshness) performance and manufacturing cost, so that the noise and vibration of the whole automobile can be stably controlled at low cost.
Disclosure of Invention
Based on this, the present invention provides a method, a system and a device for predicting a dynamic imbalance vehicle response of a transmission system, so as to solve at least one technical problem in the background art.
According to the embodiment of the invention, the method for predicting the response of the dynamic unbalance whole vehicle of the transmission system comprises the following steps:
acquiring at least one group of dynamic unbalance data of a transmission system, wherein the dynamic unbalance data comprise the dynamic unbalance amount of each transmission component in the transmission system at a corresponding preset equivalent end face and the dynamic unbalance amount of each connecting piece at a corresponding preset equivalent end face, and two adjacent transmission components are connected through the connecting piece;
calculating the equivalent dynamic unbalance amount of each preset equivalent end surface according to the dynamic unbalance amount of each transmission component at the corresponding preset equivalent end surface and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end surface;
and calculating the total noise or the total vibration generated by the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface.
In addition, the method for predicting the response of the whole vehicle with the dynamic unbalance of the transmission system according to the embodiment of the invention can also have the following additional technical characteristics:
further, the step of calculating the equivalent dynamic unbalance amount at each preset equivalent end surface according to the dynamic unbalance amount of each transmission component at the corresponding preset equivalent end surface and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end surface comprises:
vector superposition is carried out on the dynamic unbalance amount of the transmission component and the dynamic unbalance amount of the connecting piece corresponding to the same preset equivalent end face, and the equivalent dynamic unbalance amount of each preset equivalent end face is obtained;
wherein the equivalent dynamic unbalance amount at the preset equivalent end surface satisfies the following formula:
in the formula (I), the compound is shown in the specification,
the equivalent dynamic unbalance amount at the ith preset equivalent end face,
representing the amount of dynamic unbalance of the p-th transmission component corresponding to the ith preset equivalent end surface,
representing the amount of dynamic unbalance of the coupling corresponding to the ith predetermined equivalent end surface.
Further, the step of calculating the total noise or the total vibration generated by the equivalent dynamic unbalance amount at each preset response point of the whole vehicle according to the equivalent dynamic unbalance amount at each preset equivalent end surface comprises:
testing and calculating actual noise or vibration generated by the unit dynamic unbalance amount at each preset equivalent end face at each preset response point to obtain dynamic unbalance sensitivity corresponding to each preset equivalent end face;
and calculating the total noise or the total vibration of the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface and the corresponding dynamic unbalance sensitivity.
Further, the dynamic unbalance sensitivity satisfies the following conditional expression:
in the formula (I), the compound is shown in the specification,
representing the sensitivity of the dynamic unbalance between the ith preset equivalent end face and the jth preset response point,
representing the equivalent dynamic unbalance amount at the ith preset equivalent end face,
representing actual noise or vibration generated by the response of the jth preset response point to the equivalent dynamic unbalance of the ith preset equivalent end surface;
wherein, the total noise or the total vibration generated by the preset response point satisfies the following conditional expression:
in the formula (I), the compound is shown in the specification,
representing the total noise or vibration generated by the jth predetermined response point.
Further, the step of obtaining at least one set of dynamic imbalance data for the drive train comprises:
respectively acquiring statistical probability density distribution functions of dynamic unbalance amounts of the transmission parts and the connecting pieces at corresponding preset equivalent end surfaces;
and generating at least one group of dynamic unbalance data by adopting a Monte Carlo method according to the statistical probability density distribution function of the dynamic unbalance of the transmission component and the connecting piece at the corresponding preset equivalent end surfaces.
Further, when acquiring a plurality of sets of the dynamic unbalance data, after the step of calculating the total noise or the total vibration generated by each preset response point of the entire vehicle according to the equivalent dynamic unbalance amount at each preset equivalent end surface, the method further includes:
calculating the probability distribution mean u and the standard deviation sigma of the total noise or the total vibration of each preset response point according to the total noise or the total vibration generated by each preset response point, which is obtained by correspondingly calculating the multiple groups of dynamic unbalance data;
and calculating a predicted value range interval of the total noise or the total vibration predicted by each preset response point in batch production according to the probability distribution mean value u and the standard deviation sigma, wherein the predicted value range interval is [ u-lambda sigma, u + lambda sigma ], and lambda is a preset acceptable standard deviation level.
Further, the preset response points at least comprise one or more combinations of ears, steering wheels, seats and floors of all the seats;
the preset equivalent end face at least comprises one or more combinations of a front axle end face, a front output end face of the transfer case, a rear axle end face and a rear output end face of the transfer case.
According to the invention, the system for predicting the response of the whole vehicle with the dynamic unbalance of the transmission system comprises:
the data acquisition module is used for acquiring at least one group of dynamic unbalance data of the transmission system, wherein the dynamic unbalance data comprise the dynamic unbalance amount of each transmission component in the transmission system at the corresponding preset equivalent end surface and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end surface, and two adjacent transmission components are connected through the connecting pieces;
the equivalent dynamic unbalance amount calculating module is used for calculating the equivalent dynamic unbalance amount at each preset equivalent end face according to the dynamic unbalance amount of each transmission component at the corresponding preset equivalent end face and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end face;
and the response calculation module is used for calculating the total noise or the total vibration generated by the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface.
The invention also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the dynamic unbalance vehicle response prediction method of the transmission system.
The invention also provides a device for predicting the response of the transmission system dynamic unbalance whole vehicle, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the method for predicting the response of the transmission system dynamic unbalance whole vehicle.
Compared with the prior art: by providing a steady transmission system dynamic unbalance whole vehicle response prediction scheme, the influence of the total unbalance of a transmission system with large dispersion on the noise or vibration response of a whole vehicle can be effectively and accurately predicted, the noise and vibration of the whole vehicle which are most concerned by a client can be taken as a guide target, the influence of the dynamic unbalance of each component and the sensitivity of the whole vehicle on the perception of the client is comprehensively considered at the early stage of a project, and the dynamic unbalance of the component and the sensitivity of the whole vehicle are reasonably decomposed by combining cost factors.
Drawings
FIG. 1 is a flow chart of a vehicle dynamic unbalance response prediction method of a transmission system in a first embodiment of the invention;
FIG. 2 is a schematic structural diagram of a transmission system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a resultant response of a conventional system to dynamic unbalance according to an embodiment of the present invention;
FIG. 4 is a sample distribution of the equivalent dynamic imbalance magnitudes at the end face of the rear axle as provided by an embodiment of the present invention;
FIG. 5 is a sample distribution of equivalent dynamic imbalance phase at an end face of a rear axle, provided by an embodiment of the present invention;
FIG. 6 is a statistical distribution of the external ear sound pressure of a driver predicted by an embodiment of the present invention;
FIG. 7 is a predicted driver outer ear noise curve for an embodiment of the present invention;
FIG. 8 is a graph of noise contribution for the amount of dynamic unbalance of each equivalent end face predicted by an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a powertrain dynamic imbalance vehicle response prediction system in a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of a dynamic unbalance overall vehicle response prediction device of a transmission system in a fourth embodiment of the invention.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
Referring to fig. 1, a method for predicting a dynamic imbalance vehicle response of a transmission system according to a first embodiment of the present invention is shown, where the method may be implemented by software and/or hardware, and the method specifically includes steps S01-S03.
Step S01, at least one group of dynamic unbalance data of the transmission system is obtained, the dynamic unbalance data comprises the dynamic unbalance amount of each transmission component in the transmission system at the corresponding preset equivalent end face and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end face, wherein two adjacent transmission components are connected through the connecting pieces.
For a four-wheel drive vehicle, the transmission components generally include, but are not limited to, a transmission case, a front axle, a front transmission shaft, a transfer case, a rear transmission shaft, and a rear axle, and the connecting member generally is a connecting flange, that is, in a general transmission system, two adjacent transmission components are connected by a flange. By way of example and not limitation, referring to fig. 2, a transmission system of a four-wheel drive vehicle is shown, which includes a transmission case 1, a front axle 2, a front transmission shaft 3, a transfer case 4, a rear transmission shaft 5 and a rear axle 6, wherein an output end of the transmission case 1 is connected with an input end of the transfer case 4, one end of the front transmission shaft 3 is connected with the front axle 2 through a front axle flange 7, the other end of the front transmission shaft 3 is connected with a front output end of the transfer case 4 through a transfer case front output end flange 8, one end of the rear transmission shaft 5 is connected with the rear axle 6 through a rear axle flange 9, and the other end of the rear transmission shaft 5 is connected with a rear output end of the transfer case 4 through a transfer case rear output end flange 10. For a four-wheel drive vehicle, the preset equivalent end face comprises a transfer case rear output end face, a rear axle end face, a transfer case front output end face and a front axle end face. For the rear-drive vehicle, the transmission shaft does not exist in the rear-drive vehicle, the transmission part generally comprises but is not limited to a gearbox and a rear axle, so the preset equivalent end surface can comprise a gearbox output end surface and a rear axle end surface, for the front-drive vehicle, the transmission part generally comprises but is not limited to a gearbox, a front transmission shaft and a front axle, so the preset equivalent end surface can comprise a gearbox output end surface and a front axle end surface.
Specifically, the equivalent end face mainly corresponds to the dynamic unbalance of the transmission component and the connecting piece adjacent to the equivalent end face, for example, the front axle end face corresponds to the dynamic unbalance of the front transmission shaft 3, the dynamic unbalance of the front axle 2, the dynamic unbalance generated by the comprehensive runout of the front axle flange 7, and the other equivalent end faces are analogized in sequence. The dynamic unbalance of the transmission component at the corresponding equivalent end face can be obtained based on actual test of the existing vehicle type, or the dynamic unbalance of the transmission component can be equivalent to the dynamic unbalance of the transmission component at the corresponding equivalent end face, and the dynamic unbalance of the connecting flange at the corresponding equivalent end face is mainly generated by the comprehensive jump amount of the connecting flange, so that the dynamic unbalance of the connecting flange at the corresponding position of the existing vehicle type can be determined based on the comprehensive jump amount test of the connecting flange at the corresponding position.
Step S02, calculating the equivalent dynamic unbalance amount at each preset equivalent end surface according to the dynamic unbalance amount of each transmission component at the corresponding preset equivalent end surface and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end surface.
Specifically, in some alternative embodiments, step S02 may specifically include:
vector superposition is carried out on the dynamic unbalance amount of the transmission component and the dynamic unbalance amount of the connecting piece corresponding to the same preset equivalent end face, and the equivalent dynamic unbalance amount of each preset equivalent end face is obtained;
wherein the equivalent dynamic unbalance amount at the preset equivalent end face satisfies the following formula:
in the formula (I), the compound is shown in the specification,
the equivalent dynamic unbalance amount at the ith preset equivalent end face,
represents the amount of dynamic unbalance, p e 1,2, of the pth transmission component corresponding to the ith preset equivalent end face (i.e. each equivalent end face is generally adjacent to two transmission components, when three are adjacent, p e 1,2,3, and so on),
representing the amount of dynamic unbalance of the coupling corresponding to the ith predetermined equivalent end surface.
For example, the equivalent dynamic unbalance amount of the rear axle end face of the transmission system is a composite value of 3 vectors of the equivalent dynamic unbalance amount of the rear transmission shaft at the rear axle end face, the equivalent dynamic unbalance amount of the rear axle assembly at the rear axle end face, and the equivalent dynamic unbalance amount of the rear axle connecting flange runout amount at the rear axle end face.
Step S03, calculating total noise or total vibration generated at each preset response point of the entire vehicle by the equivalent dynamic unbalance amount at each preset equivalent end surface according to the equivalent dynamic unbalance amount at each preset equivalent end surface.
Specifically, in some alternative embodiments, step S03 may specifically include:
testing and calculating actual noise or vibration generated by the unit dynamic unbalance amount at each preset equivalent end face at each preset response point to obtain dynamic unbalance sensitivity corresponding to each preset equivalent end face;
and calculating the total noise or the total vibration of the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface and the corresponding dynamic unbalance sensitivity.
The dynamic unbalance sensitivity is a sensitivity degree of converting dynamic unbalance into noise or vibration, is related to the transmission performance of a vehicle body and is used for measuring actual noise or vibration generated by unit dynamic unbalance, the noise or vibration is a response parameter of the whole vehicle, and the dynamic unbalance sensitivity meets the following conditional expression:
in the formula (I), the compound is shown in the specification,
representing the sensitivity of the dynamic unbalance from the ith preset equivalent end surface to the jth preset response point,
representing the equivalent dynamic unbalance amount at the ith preset equivalent end face,
to represent the actual noise or vibration generated by the jth preset response point in response to the equivalent dynamic unbalance amount of the ith preset equivalent end face,
the vehicle model is obtained by measuring the whole vehicle of a vehicle with a similar upper vehicle body or is obtained by CAE calculation in a digital-analog stage;
wherein, the total noise or the total vibration generated by the preset response point satisfies the following conditional expression:
in the formula (I), the compound is shown in the specification,
representing the total noise or vibration generated by the jth predetermined response point.
In summary, in the method for predicting response of the dynamic unbalance whole vehicle of the transmission system in the above embodiment of the present invention, by providing a robust method for predicting response of the dynamic unbalance whole vehicle of the transmission system, the influence of the total unbalance of the transmission system with a large dispersion on the noise or vibration response of the whole vehicle can be effectively and accurately predicted, the noise and vibration of the whole vehicle, which are most concerned by customers, can be taken as a guidance target, the influence of the unbalance of each component and the sensitivity of the whole vehicle on the customer perception can be comprehensively considered at the early stage of a project, and the dynamic unbalance of the component and the sensitivity of the whole vehicle can be reasonably decomposed by combining cost factors.
Example two
The second embodiment of the present invention also provides a response prediction method for a dynamic imbalance vehicle of a transmission system, where the response prediction method for a dynamic imbalance vehicle of a transmission system in this embodiment is different from the response prediction method for a dynamic imbalance vehicle of a transmission system in the first embodiment in that, in step S01, the step of obtaining at least one set of dynamic imbalance data of a transmission system may specifically include:
respectively acquiring statistical probability density distribution functions of dynamic unbalance amounts of the transmission parts and the connecting pieces at corresponding preset equivalent end surfaces;
and generating at least one group of dynamic unbalance data by adopting a Monte Carlo method according to the statistical probability density distribution function of the dynamic unbalance amount of the transmission part and the connecting piece at the corresponding preset equivalent end surfaces.
When acquiring a plurality of groups of dynamic unbalance data, after the step of calculating the total noise or total vibration generated by each preset response point of the whole vehicle according to the equivalent dynamic unbalance amount at each preset equivalent end surface, the method further comprises the following steps:
calculating the mean value u and the standard deviation sigma of the probability distribution of the total noise or the total vibration of each preset response point according to the total noise or the total vibration generated by each preset response point, which is obtained by correspondingly calculating the plurality of groups of dynamic unbalance data;
and calculating a predicted value range interval of the total noise or the total vibration predicted by each preset response point in batch production according to the probability distribution mean value u and the standard deviation sigma, wherein the predicted value range interval is [ u-lambda sigma, u + lambda sigma ], lambda is a preset acceptable standard deviation level, and lambda is generally 3, namely the acceptable standard deviation level is +/-3 sigma.
In specific implementation, the dynamic unbalance amount corresponding to each transmission part and each connecting piece of the existing batch production vehicle model can be tested (or obtained by CAE calculation in a digital-analog stage), and the test result is subjected to statistical analysis to determine the statistical probability density distribution function of the dynamic unbalance amount corresponding to each transmission part and each connecting piece. Specifically, the dynamic unbalance amount vector includes an amplitude and a phase, the amplitude of the dynamic unbalance amount is a product of a dynamic unbalance mass and a rotation radius, and the phase is an angle formed by a rotation center connecting line and a circumferential reference position in a rotation direction. The amplitude of the dynamic unbalance of the transmission component conforms to normal, rectangular or Weibull distribution, and the phase conforms to random distribution. In addition, according to statistics, the amplitude probability density distribution of the dynamic unbalance amount generated by the connecting flange jumping amount accords with normal distribution, the maximum value, the average value and the standard deviation of the amplitude probability distribution are calculated values of the following formula, and the phase probability density distribution accords with random distribution between 0 and 360 degrees.
In the formula (II), HMiIs the suspended mass of the drive shaft at the equivalent end face i and is 1/2 of the drive shaft mass between 2 equivalent end faces.
Is the maximum value of the comprehensive bounce quantity of the connecting flange near the equivalent end surface i,
、
、
the maximum value, the average value and the standard deviation of the probability distribution of the amplitude of the dynamic unbalance generated by the connecting flange jumping quantity are respectively.
By way of example and not limitation, referring to table 1 below, a statistical probability density distribution of the amplitude and phase of the dynamic unbalance of each transmission component and each connecting flange of the conventional transmission system is shown, and each component randomly samples the amplitude and phase of the dynamic unbalance of each component in a corresponding probability distribution by a monte carlo method according to the probability distribution parameters in the table to generate N samples, where N is preferably greater than 3000. The method comprises the steps of performing vector superposition on the dynamic unbalance of adjacent components and the dynamic unbalance generated by the jump quantity of the connecting flange on N groups of sample quantities to obtain N groups of samples (including amplitude and phase) of the equivalent dynamic unbalance at an equivalent surface, performing noise or vibration prediction calculation on each response point based on the N groups of samples to obtain N groups of noise or vibration prediction data of each response point, and calculating a probability distribution mean value u and a standard deviation sigma of the N groups of noise or vibration prediction data, so that the range interval of the noise or vibration prediction value of each response point can be determined, and the noise range, the steering wheel vibration range, the seat vibration range, the floor vibration range and the like of each seat ear under the condition that the transmission system is carried by the vehicle type can be known. Fig. 4-5 are the distribution of the equivalent dynamic unbalance amplitude and phase of the rear axle end face after vector superposition.
Table 1:
FIG. 3 is a composite graphical representation of the vehicle response to the amount of driveline dynamic imbalance. The excitation source of the problem is the equivalent dynamic unbalance of 4 equivalent surfaces, and the main response of the whole vehicle is the sound of ears of each seat, the vibration of a steering wheel, the vibration of a seat and the vibration of a floor. TFijIs the sound or vibration generated by the unit equivalent dynamic unbalance amount of the equivalent plane i at the in-vehicle response point j. The noise or vibration at each response point is the vector sum of the vibration or noise components generated by the 4 equivalent surfaces at the response point, respectively. Fig. 6 is a driver's external ear sound pressure distribution situation calculated according to the present prediction method. Comparing this distribution with the design target value of 88dB, it can be determined that the failure rate that does not meet the target is 0.02%. FIG. 7 is a driver's external ear total noise curve calculated according to a predictive method, including a total noise mean curve and an upper bound curve, the upper bound curve being the noise mean plus a sample standard deviation of 3. Fig. 8 is a noise contribution amount curve of the dynamic unbalance amount of each equivalent end face calculated according to the prediction method, and the contribution amount of the dynamic unbalance amount of each equivalent end face to the noise in the vehicle can be determined through the curve, so that the control with a large contribution degree can be conveniently selected.
In summary, the method for predicting the response of the whole vehicle to the dynamic imbalance of the transmission system in the embodiment of the invention at least has the following beneficial effects:
1) the method can simulate manufacturing and assembling dispersion, predict the noise and vibration range of the response point of the whole vehicle on probability statistics, and predict the response of the whole vehicle more accurately and truly. 2) The whole vehicle response predicted by the method is used for controlling the noise and vibration of the whole vehicle, so that the control accuracy is improved, and the reasonable rate of products in batch production is improved. 3) The method can achieve the aim of guiding the noise and vibration of the whole vehicle which are most concerned by customers, comprehensively considers the influence of the dynamic unbalance of each component and the sensitivity of the whole vehicle on the customer perception in the early stage of a project, and reasonably decomposes the dynamic unbalance of the components and the sensitivity of the whole vehicle by combining cost factors.
EXAMPLE III
Another aspect of the present invention further provides a system for predicting a response of a vehicle with a dynamic imbalance of a drive train, referring to fig. 9, which shows a system for predicting a response of a vehicle with a dynamic imbalance of a drive train according to a third embodiment of the present invention, where the system for predicting a response of a vehicle with a dynamic imbalance of a drive train includes:
the data acquisition module 11 is configured to acquire at least one set of dynamic unbalance data of the transmission system, where the dynamic unbalance data includes dynamic unbalance amounts of transmission components in the transmission system at corresponding preset equivalent end surfaces and dynamic unbalance amounts of connection components at corresponding preset equivalent end surfaces, where two adjacent transmission components are connected by the connection components;
the equivalent dynamic unbalance amount calculating module 12 is configured to calculate an equivalent dynamic unbalance amount at each preset equivalent end face according to a dynamic unbalance amount of each transmission component at the corresponding preset equivalent end face and a dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end face;
the response calculation module 13 is configured to calculate, according to the equivalent dynamic unbalance amount at each preset equivalent end surface, total noise or total vibration generated at each preset response point of the entire vehicle by the equivalent dynamic unbalance amount at each preset equivalent end surface.
Further, in some optional cases of this embodiment, the equivalent dynamic unbalance amount calculating module 12 is further configured to perform vector superposition on the dynamic unbalance amount of the transmission component and the dynamic unbalance amount of the connecting member corresponding to the same preset equivalent end surface to obtain the equivalent dynamic unbalance amount at each preset equivalent end surface;
wherein the equivalent dynamic unbalance amount at the preset equivalent end surface satisfies the following formula:
in the formula (I), the compound is shown in the specification,
is the equivalent dynamic unbalance amount at the ith preset equivalent end face,
representing the amount of dynamic unbalance of the p-th transmission component corresponding to the ith preset equivalent end surface,
representing the amount of dynamic unbalance of the coupling corresponding to the ith predetermined equivalent end surface.
Further, in some optional cases of this embodiment, the response calculating module 13 is further configured to test and calculate actual noise or vibration generated by the unit dynamic unbalance amount at each preset equivalent end surface at each preset response point, so as to obtain a dynamic unbalance sensitivity corresponding to each preset equivalent end surface;
and calculating the total noise or the total vibration of the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface and the corresponding dynamic unbalance sensitivity.
Wherein the dynamic unbalance sensitivity satisfies the following conditional expression:
in the formula (I), the compound is shown in the specification,
representing the sensitivity of the dynamic unbalance from the ith preset equivalent end surface to the jth preset response point,
representing the equivalent dynamic unbalance amount at the ith preset equivalent end face,
representing the actual noise generated by the jth preset response point responding to the equivalent dynamic unbalance amount of the ith preset equivalent end surfaceOr vibration;
wherein, the total noise or the total vibration generated by the preset response point satisfies the following conditional expression:
in the formula (I), the compound is shown in the specification,
representing the total noise or vibration generated by the jth predetermined response point.
Further, in some optional cases of this embodiment, the data obtaining module is further configured to obtain statistical probability density distribution functions of dynamic unbalance amounts of the transmission components and the connection components at the corresponding preset equivalent end surfaces respectively;
and generating at least one group of dynamic unbalance data by adopting a Monte Carlo method according to the statistical probability density distribution function of the dynamic unbalance amount of the transmission part and the connecting piece at the corresponding preset equivalent end surfaces.
Further, in some optional cases of this embodiment, when acquiring multiple sets of the dynamic imbalance data, the system for predicting the response of the dynamic imbalance vehicle of the transmission system further includes:
the prediction range calculation module is used for calculating the mean value u and the standard deviation sigma of the probability distribution of the total noise or the total vibration of each preset response point according to the total noise or the total vibration generated by each preset response point, which is obtained by correspondingly calculating the plurality of groups of dynamic unbalance data; and calculating a predicted value range interval of the total noise or the total vibration predicted by each preset response point in batch production according to the probability distribution mean value u and the standard deviation sigma, wherein the predicted value range interval is [ u-lambda sigma, u + lambda sigma ], and lambda is a preset acceptable standard deviation level.
The preset response points at least comprise one or more combinations of ears, a steering wheel, a seat and a floor of each seat;
the preset equivalent end face at least comprises one or more combinations of a front axle end face, a front output end face of the transfer case, a rear axle end face and a rear output end face of the transfer case.
The functions or operation steps of the modules and units when executed are substantially the same as those of the method embodiments, and are not described herein again.
Example four
Referring to fig. 10, the present invention is a device for predicting a vehicle response to a dynamic imbalance of a drive train according to a fourth embodiment of the present invention, which includes a memory 200, a processor 100, and a computer program 300 stored in the memory and executable on the processor, where the processor 100 executes the computer program 300 to implement the method for predicting a vehicle response to a dynamic imbalance of a drive train as described above.
The driveline dynamic imbalance vehicle response prediction device may be a computer, a vehicle test device, or the like, and the processor 100 may be a Central Processing Unit (CPU), a controller, a microcontroller, a microprocessor, or another data Processing chip in some embodiments, and is configured to run a program code stored in the memory 200 or process data, for example, execute an access restriction program.
The memory 200 includes at least one type of readable storage medium including a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, and the like. The memory 200 may be, in some embodiments, an internal storage unit of the driveline dynamic imbalance vehicle response prediction device, such as a hard disk of the driveline dynamic imbalance vehicle response prediction device. The memory 200 may also be an external storage device of the vehicle response prediction device in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, provided on the vehicle response prediction device. Further, the memory 200 may also include both an internal memory unit and an external memory device of the driveline dynamic imbalance vehicle response prediction apparatus. The memory 200 may be used not only to store application software installed in the drive train dynamic unbalance entire vehicle response prediction apparatus and various types of data, but also to temporarily store data that has been output or will be output.
It should be noted that the configuration shown in FIG. 10 does not constitute a limitation of the driveline dynamic imbalance vehicle response prediction apparatus, which in other embodiments may include fewer or more components than shown, or a combination of certain components, or a different arrangement of components.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the method for predicting the response of the whole vehicle with the dynamic unbalance of the transmission system is realized.
Those of skill in the art will understand that the logic or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable storage medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable storage medium may even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
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 do not necessarily 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.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for predicting response of a dynamic unbalance whole vehicle of a transmission system is characterized by comprising the following steps:
acquiring at least one group of dynamic unbalance data of a transmission system, wherein the dynamic unbalance data comprise the dynamic unbalance amount of each transmission component in the transmission system at a corresponding preset equivalent end face and the dynamic unbalance amount of each connecting piece at a corresponding preset equivalent end face, and two adjacent transmission components are connected through the connecting piece;
calculating the equivalent dynamic unbalance amount of each preset equivalent end surface according to the dynamic unbalance amount of each transmission component at the corresponding preset equivalent end surface and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end surface;
and calculating the total noise or the total vibration generated by the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface.
2. The method for predicting the response of the dynamic unbalance whole vehicle of the transmission system as claimed in claim 1, wherein the step of calculating the equivalent dynamic unbalance amount at each preset equivalent end surface according to the dynamic unbalance amount of each transmission component at the corresponding preset equivalent end surface and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end surface comprises:
vector superposition is carried out on the dynamic unbalance amount of the transmission component and the dynamic unbalance amount of the connecting piece corresponding to the same preset equivalent end face, and the equivalent dynamic unbalance amount of each preset equivalent end face is obtained;
wherein the equivalent dynamic unbalance amount at the preset equivalent end surface satisfies the following formula:
in the formula (I), the compound is shown in the specification,
the equivalent dynamic unbalance amount at the ith preset equivalent end face,
representing the amount of dynamic unbalance of the p-th transmission component corresponding to the ith preset equivalent end surface,
representing the amount of dynamic unbalance of the coupling corresponding to the ith predetermined equivalent end surface.
3. The method for predicting the response of the dynamic unbalance whole vehicle of the transmission system according to claim 1, wherein the step of calculating the total noise or the total vibration generated by the equivalent dynamic unbalance amount at each preset response point of the whole vehicle at each preset equivalent end surface according to the equivalent dynamic unbalance amount at each preset equivalent end surface comprises the following steps:
testing and calculating actual noise or vibration generated by the unit dynamic unbalance at each preset equivalent end face at each preset response point to obtain dynamic unbalance sensitivity corresponding to each preset equivalent end face;
and calculating the total noise or the total vibration of the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface and the corresponding dynamic unbalance sensitivity.
4. The dynamic unbalance whole vehicle response prediction method of the transmission system according to claim 3, wherein the dynamic unbalance sensitivity satisfies the following conditional expression:
in the formula (I), the compound is shown in the specification,
represents the ith preset equivalenceThe sensitivity of the dynamic imbalance between the end face and the jth preset response point,
representing the equivalent dynamic unbalance amount at the ith preset equivalent end face,
representing actual noise or vibration generated by the response of the jth preset response point to the equivalent dynamic unbalance of the ith preset equivalent end surface;
wherein, the total noise or the total vibration generated by the preset response point satisfies the following conditional expression:
in the formula (I), the compound is shown in the specification,
representing the total noise or vibration generated by the jth predetermined response point.
5. The driveline dynamic imbalance vehicle response prediction method of claim 1, wherein the step of obtaining at least one set of dynamic imbalance data for the driveline comprises:
respectively acquiring statistical probability density distribution functions of dynamic unbalance amounts of the transmission parts and the connecting pieces at corresponding preset equivalent end surfaces;
and generating at least one group of dynamic unbalance data by adopting a Monte Carlo method according to the statistical probability density distribution function of the dynamic unbalance amount of the transmission part and the connecting piece at the corresponding preset equivalent end surfaces.
6. The method for predicting the response of the whole vehicle with the dynamic unbalance of the transmission system according to claim 5, wherein when a plurality of sets of the dynamic unbalance data are obtained, after the step of calculating the total noise or the total vibration generated by the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface, the method further comprises:
calculating the mean value u and the standard deviation sigma of the probability distribution of the total noise or the total vibration of each preset response point according to the total noise or the total vibration generated by each preset response point, which is obtained by correspondingly calculating the plurality of groups of dynamic unbalance data;
and calculating a predicted value range interval of the total noise or the total vibration predicted by each preset response point in batch production according to the probability distribution mean value u and the standard deviation sigma, wherein the predicted value range interval is [ u-lambda sigma, u + lambda sigma ], and lambda is a preset acceptable standard deviation level.
7. The vehicle dynamic unbalance response prediction method of the transmission system according to any one of claims 1 to 6, wherein the preset response points at least comprise one or more combinations of ears, steering wheel, seat and floor of each seat;
the preset equivalent end face at least comprises one or more combinations of a front axle end face, a front output end face of the transfer case, a rear axle end face and a rear output end face of the transfer case.
8. A driveline dynamic imbalance vehicle response prediction system, said system comprising:
the data acquisition module is used for acquiring at least one group of dynamic unbalance data of the transmission system, wherein the dynamic unbalance data comprise the dynamic unbalance amount of each transmission component in the transmission system at the corresponding preset equivalent end surface and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end surface, and two adjacent transmission components are connected through the connecting pieces;
the equivalent dynamic unbalance amount calculating module is used for calculating the equivalent dynamic unbalance amount at each preset equivalent end face according to the dynamic unbalance amount of each transmission component at the corresponding preset equivalent end face and the dynamic unbalance amount of each connecting piece at the corresponding preset equivalent end face;
and the response calculation module is used for calculating the total noise or the total vibration generated by the equivalent dynamic unbalance at each preset response point of the whole vehicle according to the equivalent dynamic unbalance at each preset equivalent end surface.
9. A computer-readable storage medium, having stored thereon a computer program, which, when being executed by a processor, carries out a method for driveline dynamic imbalance vehicle response prediction as claimed in any one of claims 1 to 7.
10. A driveline dynamic imbalance vehicle response prediction apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor when executing the program implementing a driveline dynamic imbalance vehicle response prediction method as claimed in any one of claims 1 to 7.
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