CN111723434B - Electric drive assembly design scheme evaluation method and system based on howling - Google Patents
Electric drive assembly design scheme evaluation method and system based on howling Download PDFInfo
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- CN111723434B CN111723434B CN202010455641.1A CN202010455641A CN111723434B CN 111723434 B CN111723434 B CN 111723434B CN 202010455641 A CN202010455641 A CN 202010455641A CN 111723434 B CN111723434 B CN 111723434B
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- 238000013461 design Methods 0.000 title claims abstract description 45
- 238000011156 evaluation Methods 0.000 title claims abstract description 26
- 230000002860 competitive effect Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 13
- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000035559 beat frequency Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/10—Noise analysis or noise optimisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention relates to a howling-based electric drive assembly design scheme evaluation method and a howling-based electric drive assembly design scheme evaluation system, wherein the method comprises the following steps: collecting noise data and motor rotation speed information when the competitive product electric drive assembly operates; eliminating order howling in the noise data of the competitive electric drive assembly to obtain pure tone noise data; adding the corresponding orders of the assembly parameters of the electric drive assembly design scheme into the pure tone noise data to obtain NVH noise data under the electric drive assembly design scheme; evaluating NVH noise data; and evaluating different electric drive assembly designs according to the evaluation result. The system comprises a plurality of noise sensors and an upper computer connected with the noise sensors, wherein the upper computer is connected with a motor controller of the electric drive assembly. The invention has the advantages that: howling data can be obtained in the conceptual design stage of the electric drive assembly, the development period of the electric drive assembly is shortened, the die opening cost of the physical prototype of the electric drive assembly with different howling schemes is saved, and the development cost is saved.
Description
Technical Field
The invention relates to the field of electric drive assembly design, in particular to a howling-based electric drive assembly design scheme evaluation method.
Background
Compared with the traditional fuel oil automobile, the electric automobile has the advantages of smaller background noise, insufficient noise masking effect and obvious high-frequency howling characteristics. The human ear is sensitive to high-frequency noise more than low-frequency noise because the human ear has different sensitivity to noise in different frequency bands, so that even if the noise level is lower, the high-frequency order howling has the NVH risk of causing customer discomfort, and a larger proportion of working content in the whole research and development process is developed around how to improve the howling of the electric drive assembly. On the other hand, for the electric vehicle speed reducer, if the intervals between the output level of the speed reducer and the low-frequency level of the motor are unreasonable, the intervals between the output level and the low-frequency level of the motor are relatively close, so that beat frequency is formed by modulating the output level and the low-frequency level of the motor, and howling of the electric drive assembly is aggravated. Therefore, the comprehensive selection of the pole number of the reasonable motor and the speed ratio of the speed reducer can effectively improve the squeal performance of the electric drive assembly when the electric drive assembly is designed.
However, in the development and design process of the electric drive assembly, howling data of the electric drive assembly can be obtained only when a physical prototype is required to be produced, which may cause poor howling performance of the newly developed electric drive assembly, thereby not only increasing the development cost, but also prolonging the development period.
However, there is no patent at present that discloses a method or apparatus that can obtain squeal data for the number of poles and speed ratios of a particular motor without obtaining a physical prototype.
Disclosure of Invention
The invention mainly solves the problem that howling data of a certain motor drive assembly design scheme cannot be obtained before a physical model machine is obtained, and provides the howling data based on the howling, which can be obtained in the conceptual design stage of the electric drive assembly, is convenient for screening the electric drive assembly design scheme, and reduces the development cost and development period of the electric drive assembly.
The technical scheme adopted by the invention for solving the technical problems is that the electric drive assembly design scheme evaluation method based on howling comprises the following steps:
s1: collecting noise data and motor rotation speed information when the competitive product electric drive assembly operates;
s2: eliminating order howling in the noise data of the competitive electric drive assembly to obtain pure tone noise data;
s3: adding the corresponding orders of the assembly parameters of the electric drive assembly design scheme into the pure tone noise data to obtain NVH noise data under the electric drive assembly design scheme;
s4: evaluating NVH noise data;
s5: and evaluating different electric drive assembly designs according to the evaluation result.
The method comprises the steps of carrying out data processing on the competing noise of the electric drive assembly under the same power torque platform to obtain pure tone noise data except for order squeal of the competing electric drive assembly, wherein the pure tone noise data is characterized in that the noise energy is continuously increased along with the increase of the rotating speed of the electric drive assembly, but no order squeal exists. After pure tone noise data of the competitive electric drive assembly are obtained, howling orders under the matching of pole grooves of different motors and the matching of different gear ratios of a speed reducer are added to the pure tone noise, howling data of the electric drive assembly with different schemes are obtained, and the electric drive assembly design scheme is evaluated by evaluating the howling data. The NVH engineer can optimally design NVH for howling of the electric drive assembly in the conceptual design stage of the electric drive assembly, so that the development period of the electric drive assembly is shortened, the die opening cost of the physical model machine of the electric drive assembly with different howling schemes is saved, and the development cost is saved.
As a preferable scheme of the scheme, running-in preheating and lubrication are further required for the racing electric drive assembly before executing step S1. The electric drive assembly can be operated in a good state, and the reliability and the reference property of the collected noise data are improved.
As a preferable scheme of the scheme, when the noise data of the racing product electric drive assembly is collected in the step S1, the noise data of the vehicle accelerator with different degrees, which is evenly increased in depth and the noise data of the vehicle accelerator with different degrees, which is evenly decreased in energy recovery torque, are collected for a plurality of times.
As a preferred embodiment of the foregoing, the assembly parameters of step S3 include motor pole count, slot count, number of teeth of the input gear set of the reduction gear and number of teeth of the intermediate gear set.
Correspondingly, the invention also provides an electric drive assembly design scheme evaluation system based on howling, which is suitable for the electric drive assembly design scheme evaluation method based on howling, and comprises a plurality of noise sensors and an upper computer connected with the noise sensors, wherein the upper computer is connected with a motor controller of the electric drive assembly, and the noise sensors are arranged in different directions of the electric drive assembly and are arranged at fixed distances from an outer package of the electric drive assembly.
Noise data are acquired through a plurality of noise sensors and used for acquiring the noise data of the comprehensive electric drive assembly, so that the acquired noise data are more fit with actual conditions.
As a preferable mode of the above-described mode, the electrically driven assembly and the noise sensor are disposed in a semi-anechoic chamber. The influence of the echo on noise collection is reduced, and a small amount of echo existing in actual conditions is simulated.
The invention has the advantages that: the howling data can be obtained in the conceptual design stage of the electric drive assembly, namely under the condition that no prototype is provided, so that NVH engineers can carry out NVH optimization design on howling of the electric drive assembly in the conceptual design stage of the electric drive assembly, the development period of the electric drive assembly is shortened, the die opening cost of physical prototypes of the electric drive assembly with different howling schemes is saved, and the development cost is saved.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of a howling-based electric drive assembly design evaluation method.
Detailed Description
The technical scheme of the invention is further described below through examples and with reference to the accompanying drawings.
Examples:
the embodiment relates to an electric drive assembly design scheme evaluation system based on howling, the system includes 5 noise sensors and an upper computer connected with the noise sensors, the upper computer is further connected with a motor controller of the electric drive assembly, the noise sensors are respectively arranged above, on the left side, on the right side, on the front side and on the rear side of the electric drive assembly, each noise sensor is arranged 1 meter away from the outer envelope of the electric drive assembly, in order to simulate the running state of the electric drive assembly in a vehicle, the electric drive assembly needs to be arranged at a certain height from the ground, in this implementation, the mass center of the electric drive assembly needs to be arranged 1 meter away from the ground, and meanwhile, the electric drive assembly and the noise sensors need to be arranged in a semi-anechoic chamber to reduce the influence of indoor echo and simulate the echo generated by the noise in actual conditions on surrounding buildings or the vehicle surface through retaining certain echo.
Correspondingly, the embodiment provides a howling-based electric drive assembly design scheme evaluation method, which is implemented by adopting the howling-based electric drive assembly design scheme evaluation system, as shown in fig. 1, and comprises the following steps:
s1: the noise microphone is arranged at the front, rear, left and right positions of the finished racing electric drive assembly and at the position 1 meter above the center of the electric drive assembly, MCU signals of a motor controller are synchronously collected and used for extracting motor rotation speed data, running-in preheating and full lubrication of the electric drive assembly are needed, specifically, lifting speed warming-up is carried out for 4-6 times by using the maximum torque of the 30% electric drive assembly and negative torque under an energy recovery strategy, and then steady state warming-up is carried out for 5 minutes at a constant speed of 4000rpm under the maximum torque of 20%. After the warm-up of the racing electric drive assembly is finished, starting the collection of noise data and motor rotation speed information, when the collection is carried out, enabling the electric drive assembly to operate under different test working conditions, wherein the test working conditions are respectively uniform speed rise under 30%, 50% and 70% of the depth of the whole vehicle accelerator and uniform speed reduction under the energy recovery torque, the motor rotation speed change rate is kept to be 200rpm/s in the collection process, the motor rotation speed change range is between 500 and 8000rpm, and collecting three times of data for each working condition, and analyzing and processing median data;
s2: the method comprises the steps that motor orders and reducer orders in noise data of a competing product electric drive assembly are eliminated through a filter function in simulation software in an upper computer, and pure tone noise data which continuously increases with rising noise energy of the rotating speed of the electric drive assembly but does not have order howling is obtained;
s3: adding the corresponding ORDER of assembly parameters of the electric drive assembly design scheme to pure tone noise data through a FILTER function in simulation software in an upper computer to obtain NVH noise data under the electric drive assembly design scheme, wherein the assembly parameters comprise motor pole numbers, slot numbers, gear set tooth numbers of an input stage of a speed reducer and gear set tooth numbers of a middle shaft, and in the implementation, the adopted simulation software is LMS Time Signal Calculator, and the adopted FILTER function is Filter_ORDER;
s4: evaluating NVH noise data through corresponding noise evaluation software, and simultaneously carrying out subjective evaluation on howling schemes of different electric drive assemblies in a subjective evaluation room through an organization subjective evaluation team;
s5: and evaluating different electric drive assembly designs according to the evaluation result.
According to the method, the competing product noise of the electric drive assembly under the same power torque platform is subjected to data processing to obtain pure tone noise data except for order squeal of the competing product electric drive assembly, wherein the pure tone noise data is characterized in that the noise energy is continuously increased along with the increase of the rotating speed of the electric drive assembly, but no order squeal exists. After pure tone noise data of the competitive electric drive assembly are obtained, howling orders under the matching of pole grooves of different motors and the matching of different gear ratios of a speed reducer are added to the pure tone noise, howling data of the electric drive assembly with different schemes are obtained, and the electric drive assembly design scheme is evaluated by evaluating the howling data. The NVH engineer can optimally design NVH for howling of the electric drive assembly in the conceptual design stage of the electric drive assembly, so that the development period of the electric drive assembly is shortened, the die opening cost of the physical model machine of the electric drive assembly with different howling schemes is saved, and the development cost is saved.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
1. An electric drive assembly design scheme evaluation method based on howling is characterized by comprising the following steps: the method comprises the following steps:
s1: collecting noise data and motor rotation speed information when the competitive product electric drive assembly operates;
s2: eliminating order howling in the noise data of the competitive electric drive assembly to obtain pure tone noise data;
s3: adding howling orders corresponding to assembly parameters of the electric drive assembly design scheme under the coordination of motor pole grooves and different gear ratios of a speed reducer into pure tone noise data to obtain NVH noise data under the electric drive assembly design scheme;
s4: evaluating NVH noise data;
s5: and evaluating different electric drive assembly designs according to the evaluation result.
2. The howling-based electric drive assembly design evaluation method of claim 1, wherein: before executing step S1, running-in preheating and lubrication are also required for the racing electric drive assembly.
3. The howling-based electric drive assembly design evaluation method of claim 1, wherein: when the noise data of the racing product electric drive assembly is collected in the step S1, the noise data of the racing product electric drive assembly, which are evenly increased in speed and evenly decreased in energy recovery torque under the depth of the accelerator of the whole vehicle with different degrees, are collected for a plurality of times under the same power torque platform.
4. The howling-based electric drive assembly design evaluation method of claim 1, wherein: the assembly parameters in step S3 include motor pole count, slot count, number of teeth of the input gear set of the reduction gear and number of teeth of the intermediate gear set.
5. Howling-based electric drive assembly design evaluation system, adapted to the howling-based electric drive assembly design evaluation method as set forth in any one of claims 1 to 4, characterized in that: the intelligent control system comprises a plurality of noise sensors and an upper computer connected with the noise sensors, wherein the upper computer is connected with a motor controller of an electric drive assembly, the noise sensors are arranged in different directions of the electric drive assembly and are arranged at fixed distances from an outer package of the electric drive assembly.
6. The howling-based electric drive assembly design evaluation system of claim 5, wherein: the electric drive assembly and the noise sensor are arranged in the semi-anechoic chamber.
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| CN103994892A (en) * | 2014-05-05 | 2014-08-20 | 中国汽车技术研究中心 | Test system for vehicle acoustical power and test method thereof |
| CN109297718A (en) * | 2018-09-29 | 2019-02-01 | 重庆长安汽车股份有限公司 | A kind of evaluation method of order whistler |
| WO2019207952A1 (en) * | 2018-04-24 | 2019-10-31 | 株式会社日立製作所 | Vibration noise response plan recommendation system |
| CN110427709A (en) * | 2019-08-06 | 2019-11-08 | 华研慧声（苏州）电子科技有限公司 | Sound quality order balance optimizing and active sounding design method based on genetic algorithm |
| CN110481470A (en) * | 2019-08-15 | 2019-11-22 | 中国第一汽车股份有限公司 | A kind of electric car active sonification system design method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994892A (en) * | 2014-05-05 | 2014-08-20 | 中国汽车技术研究中心 | Test system for vehicle acoustical power and test method thereof |
| WO2019207952A1 (en) * | 2018-04-24 | 2019-10-31 | 株式会社日立製作所 | Vibration noise response plan recommendation system |
| CN109297718A (en) * | 2018-09-29 | 2019-02-01 | 重庆长安汽车股份有限公司 | A kind of evaluation method of order whistler |
| CN110427709A (en) * | 2019-08-06 | 2019-11-08 | 华研慧声（苏州）电子科技有限公司 | Sound quality order balance optimizing and active sounding design method based on genetic algorithm |
| CN110481470A (en) * | 2019-08-15 | 2019-11-22 | 中国第一汽车股份有限公司 | A kind of electric car active sonification system design method |
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