CN112326261A - Automobile door closing sound quality checking method - Google Patents
Automobile door closing sound quality checking method Download PDFInfo
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- CN112326261A CN112326261A CN202011148450.7A CN202011148450A CN112326261A CN 112326261 A CN112326261 A CN 112326261A CN 202011148450 A CN202011148450 A CN 202011148450A CN 112326261 A CN112326261 A CN 112326261A
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- door closing
- closing sound
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
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- Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
Abstract
The invention discloses a method for checking the door closing sound quality of an automobile, which comprises the following steps of S1, carrying out subjective evaluation and objective test analysis on the door closing sound quality of the automobile; s2, judging whether the low-frequency energy reaches the standard; if so, the investigation is finished; if not, go to step S3; s3, judging whether each component meets the corresponding setting condition; if not, optimizing the part; if yes, go to step S4; s4, the quality of the door closing sound of the automobile is objectively tested and analyzed, and the step S2 is executed. The invention can improve the quality of door closing sound.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method for checking the door closing sound quality of an automobile.
Background
With the rapid development of the automobile industry, the living standard of people is continuously improved, and the requirements of customers on the all-round quality of automobiles are higher and higher, for example, the requirement on the NVH performance of automobiles is gradually shifted from a simple low noise level to good sound quality, and the texture of sound products of automobiles becomes a new target pursued by a plurality of host factories.
Sound quality refers to the result of the auditory perception of a sound event by the human ear and the subjective judgment made. The sound quality of the automobile comprises five types, namely door closing sound quality, uniform speed sound quality, accelerating sound quality, power assembly sound quality and electric appliance sound quality.
The door closing sound quality refers to the sound characteristic perceived by a consumer in the whole door closing process of an automobile door, the quality of the door closing sound can enable the consumer to think whether the automobile is expensive or cheap, the good door closing sound quality gives a sense of being muddy, moderate in loudness and compact, and the poor door closing sound quality enables the consumer to feel that the loudness is large, thick, sharp and loose.
The sound involved in the door closing process mainly comprises: the impact between the door lock and the lock pin of the vehicle door is high-frequency sound, and the inner door plate, the outer door plate, the inner decorative plate and accessories are excited to generate low-frequency resonance sound. Wherein, the low-frequency resonance sound directly influences whether the door closing process is thick and thick or not.
How to improve the quality of the door closing sound of the car is one of the important problems to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a method for checking the door closing sound quality of an automobile, which is used for solving the defects in the prior art and is beneficial to improving the door closing sound quality of the automobile.
The invention provides a method for checking the quality of automobile door closing sound, which comprises the following steps,
s1, performing subjective evaluation and objective test analysis on the quality of the door closing sound of the automobile;
s2, judging whether the low-frequency energy reaches the standard; if so, the investigation is finished; if not, go to step S3;
s3, judging whether each component meets the corresponding setting condition; if not, optimizing the part; if yes, go to step S4;
s4, the quality of the door closing sound of the automobile is objectively tested and analyzed, and the step S2 is executed.
The method for checking the quality of the door closing sound of the automobile comprises the following steps of optionally performing objective test analysis on the quality of the door closing sound of the automobile, wherein the objective test analysis comprises the test of a low-frequency energy value in the door closing process;
the condition that the low-frequency energy reaches the standard is that the low-frequency energy is not less than 34dB (A).
The method for checking the quality of the door closing sound of the automobile as described above, wherein optionally, in step S3, whether each component satisfies the corresponding setting condition includes:
whether the car door assembling and adjusting precision is full or not;
whether the collision position of the car door lock body and the lock catch meets the condition or not;
whether the air tightness of the whole vehicle meets the condition or not;
whether the door rubber strip meets the condition or not;
whether the door frame adhesive tape meets the condition or not;
whether the two sealing gaps of the vehicle door meet the condition or not.
The method for checking the quality of the door-closing sound of the automobile as described above, wherein optionally, the step S3 further includes adjusting the door installation accuracy until the door installation accuracy is greater than 90% when the door installation adjustment accuracy does not meet the condition.
The method for checking the quality of door-closing sound of the vehicle as described above, wherein, optionally, in step S3, the method further includes adjusting the relative position of the door lock body and the latch until the door lock body and the latch are aligned when the collision position of the door lock body and the latch does not satisfy the condition.
The method for checking the quality of the door closing sound of the automobile as described above, wherein optionally, in step S3, the method further includes optimizing the air tightness of the entire automobile until the air tightness of the entire automobile is not less than 90scfm when the air tightness of the entire automobile does not meet the condition.
The method for checking the quality of the door closing sound of the automobile as described above, wherein optionally, in step S3, the method further includes optimizing the compression amount of the sealing rubber strip until the compression amount of the door rubber strip is greater than 6mm when the compression amount of the door rubber strip does not satisfy the condition.
The method for checking the quality of the door closing sound of the automobile as described above, wherein optionally, in step S3, the method further includes optimizing the compression amount of the door frame rubber strip until the compression amount of the door frame rubber strip is greater than 3mm when the compression amount of the door frame rubber strip does not satisfy the condition.
The method for checking the quality of the door closing sound of the automobile as described above, wherein optionally, in step S3, when the door sealing gap does not satisfy the condition, the method further includes optimizing the door sealing gap until the door sealing gap satisfies the design requirement and is uniform.
Compared with the prior art, the invention can effectively improve the door closing sound quality of the automobile by detecting and troubleshooting the door closing sound quality at low frequency. According to the method, whether the low-frequency energy in the door closing sound is qualified or not is checked one by one to judge whether the relevant parts meet the corresponding setting conditions or not, and then the relevant parts are optimized in a targeted manner, so that the quality of the door closing sound of the automobile is improved.
Drawings
FIG. 1 is a flow chart of the steps of the present invention
FIG. 2 is a low frequency energy plot of closing sound of a door in accordance with the present invention;
FIG. 3 is a graph of the closing sound spectrum of a door according to the present invention;
fig. 4 is a detailed step flow diagram of the present invention.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
In order to improve the quality of the door closing sound of the automobile, the inventor carries out deep research on parameters influencing the quality of the door closing sound of the automobile, and finally finds that the low-frequency energy can represent the quality of the door closing sound of the automobile. That is, when the door of the car is closed, the greater the generated low frequency energy is, the better the door closing sound quality is. In order to further explore the influence of low-frequency energy generation factors, the inventor has conducted intensive research on components influencing low-frequency energy, and found out a specific method for investigating the quality of door closing sound as follows:
referring to fig. 1 and 4, the present invention provides a method for checking the quality of door closing sound of a car, which comprises the following steps,
s1, performing subjective evaluation and objective test analysis on the quality of the door closing sound of the automobile; in particular implementations, sound quality refers to the result of the auditory perception of sound events by the human ear and the subjective judgment made. The sound quality of the automobile comprises five types, namely door closing sound quality, uniform speed sound quality, accelerating sound quality, power assembly sound quality and electric appliance sound quality. The door closing sound quality refers to the sound characteristic perceived by a consumer in the whole door closing process of an automobile door, the quality of the door closing sound can enable the consumer to think whether the automobile is expensive or cheap, the good door closing sound quality gives a sense of being muddy, moderate in loudness and compact, and the poor door closing sound quality enables the consumer to feel that the loudness is large, thick, sharp and loose. In specific implementation, the step can be carried out by multiple people for subjective evaluation and scoring, and whether the average score reaches the standard or not is judged.
S2, judging whether the low-frequency energy reaches the standard; if so, the investigation is finished; if not, go to step S3; that is, in the present application, the low frequency energy is used as a main index for determination. The low-frequency energy is sound energy in a frequency range of 20Hz-80Hz in the door closing process, and the unit dB (A) is an objective index for measuring the thickness and heaviness at the door closing moment. As shown in FIG. 2, the low-frequency energy of a certain vehicle door is greatly improved through related optimization measures, and the subjective evaluation of the heavy feeling is obviously improved. The low-frequency energy of the original state is 32.46dB (A), and the low-frequency energy of the optimized state is 36.19dB (A). Referring to fig. 3, a frequency spectrum diagram refers to the total energy in the square frame region, and each peak value is mainly caused by the entire car door, the local mode of the sheet metal, the mode of the acoustic cavity, and the like. Generally, the low-frequency energy influence factors are mainly as follows: the door closing process exciting force (including door lock exciting force and door sheet metal exciting force) and the sealing performance of the whole vehicle. Therefore, it needs to be examined from the above two aspects.
Further, S3, determining whether each component satisfies a corresponding setting condition; if not, optimizing the part; if yes, go to step S4; specifically, in this step, the parts that affect the quality of the door closing sound are mainly checked one by one, and the parts that are not qualified are judged one by one.
S4, the quality of the door closing sound of the automobile is objectively tested and analyzed, and the step S2 is executed.
By the method, the method for influencing the door closing sound quality of the automobile can be found out in time, and the improvement of the door closing sound quality of the automobile is facilitated.
As a better implementation mode, objective test analysis is carried out on the quality of the door closing sound of the automobile, including testing the low-frequency energy value in the door closing process; the condition that the low-frequency energy reaches the standard is that the low-frequency energy is not less than 34dB (A). If the low-frequency energy reaches the standard, the low-frequency energy can be finished without next step of checking, and if the low-frequency energy does not reach the standard, the related parts are checked one by one.
As a preferred implementation manner, in step S3, whether each component satisfies the corresponding setting condition includes:
whether the car door assembling and adjusting precision is full or not; specifically, when the door fitting adjustment accuracy does not satisfy the condition, the door fitting accuracy is adjusted until the door fitting accuracy is greater than 90%.
Whether the collision position of the car door lock body and the lock catch meets the condition or not; specifically, when the collision position of the door lock body and the lock catch does not meet the condition, the relative position of the door lock body and the lock catch is adjusted until the door lock body and the lock catch are centered.
Whether the air tightness of the whole vehicle meets the condition or not; specifically, when the air tightness of the whole vehicle does not meet the condition, the air tightness of the whole vehicle is optimized until the air tightness of the whole vehicle is not less than 90scfm (cubic feet per minute). The air tightness is a key index for measuring the leakage quantity of the whole vehicle, and influences the low-frequency energy released by the modal excitation of the air flow pressure of the vehicle body cavity in the door closing process. The better the air tightness of the whole vehicle, the stronger the air flow pressure as an excitation source of the cavity mode of the vehicle body, and the more the low-frequency energy can be released. The following table shows the effect of the airtightness optimization on the low-frequency energy for closing the door. If the step does not meet the requirement, optimizing the air tightness until the air tightness reaches the standard, and if the step meets the requirement, checking the compression amount of the rubber strips of the vehicle door and the door frame. The effect of airtightness on low frequency energy can be seen intuitively from the following table:
whether the door rubber strip meets the condition or not; specifically, when the compression amount of the rubber strip of the vehicle door does not meet the condition, the compression amount of the sealing rubber strip is optimized until the compression amount of the rubber strip of the vehicle door is greater than 6 mm. Whether the door frame adhesive tape meets the condition or not; specifically, when the door frame adhesive tape compression capacity does not meet the conditions, the door frame adhesive tape compression capacity is optimized until the door frame adhesive tape compression capacity is larger than 3 mm. Whether the compression amount of the door and door frame rubber strips meets the requirement is checked, the compression amount of the door rubber strips is generally required to be more than or equal to 6mm, and the compression amount of the door frame rubber strips is more than or equal to 3 mm. If the requirements are not met, the compression amount of two sealing rubber strips is optimized, and if the requirements are met, the inspection of two sealing gaps of the vehicle door is carried out. Under the condition that the door structure and the acoustic cavity mode are not variable, the compression amount of the rubber strip directly influences the magnitude of the interaction force of the door-sealing strip-vehicle body system in the door closing process, and the compression amount of the rubber strip meets the requirement and is enough to excite the low-frequency energy in the closing process of the door system;
whether the two sealing gaps of the vehicle door meet the condition or not. Specifically, when the door seal clearance does not satisfy the condition, the door clearance is optimized until the door seal clearance satisfies the design requirements and is uniform. Checking whether two sealing gaps of the vehicle door meet design requirements and whether the gaps are uniform or not, optimizing the sealing gaps if the two sealing gaps do not meet the requirements to ensure that the two sealing gaps meet the design requirements and the gaps are uniform and consistent, and performing local modal checking on the inner plate and the outer plate of the vehicle door if the two sealing gaps meet the requirements;
the first (outer) sealing gap d1 of the general vehicle door needs to satisfy the following requirements: 10 < d1 < 14mm, and the second (inner) sealing gap d2 needs to satisfy the following conditions: 12 < d2 < 16mm, and the sealing clearance is controlled at d1/d2 +/-1.5 mm, and it is required to ensure that the two-side out-of-tolerance cannot be too large, for example, half of the two-side out-of-tolerance is excessive, and the other half of the two-side out-of-tolerance is poor, so that the sealing clearance is not uniform, the compression amount and the pressure distribution of the rubber strip are not uniform, the closing resistance of the vehicle door is increased, the compression potential energy of the sealing strip at a local position is large, the vehicle door is closed and shaken, and. The following table shows that after the sealing clearance of a certain vehicle type is manually adjusted to ensure the uniformity of the compression amount of the whole door frame rubber strip, the thickness and the weight are obviously improved, and the low-frequency energy is improved by about 2.4dB (A).
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (9)
1. A method for checking the quality of automobile door closing sound is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s1, performing subjective evaluation and objective test analysis on the quality of the door closing sound of the automobile;
s2, judging whether the low-frequency energy reaches the standard; if so, the investigation is finished; if not, go to step S3;
s3, judging whether each component meets the corresponding setting condition; if not, optimizing the part; if yes, go to step S4;
s4, the quality of the door closing sound of the automobile is objectively tested and analyzed, and the step S2 is executed.
2. The car door closing sound quality inspection method according to claim 1, wherein: performing objective test analysis on the quality of the automobile door closing sound, including testing the low-frequency energy value in the door closing process;
the condition that the low-frequency energy reaches the standard is that the low-frequency energy is not less than 34dB (A).
3. The car door closing sound quality inspection method according to claim 2, wherein: in step S3, whether each component satisfies the corresponding setting condition includes:
whether the car door assembling and adjusting precision is full or not;
whether the collision position of the car door lock body and the lock catch meets the condition or not;
whether the air tightness of the whole vehicle meets the condition or not;
whether the door rubber strip meets the condition or not;
whether the door frame adhesive tape meets the condition or not;
whether the two sealing gaps of the vehicle door meet the condition or not.
4. The car door closing sound quality inspection method according to claim 3, wherein: the step S3 further includes adjusting the door installation accuracy until the door installation accuracy is greater than 90% when the door installation adjustment accuracy does not satisfy the condition.
5. The car door closing sound quality inspection method according to claim 3, wherein: step S3, when the collision position between the door lock and the latch does not satisfy the condition, adjusting the relative position between the door lock and the latch until the two are aligned.
6. The car door closing sound quality inspection method according to claim 3, wherein: and step S3, optimizing the air tightness of the whole vehicle when the air tightness of the whole vehicle does not meet the condition until the air tightness of the whole vehicle is not less than 90 scfm.
7. The car door closing sound quality inspection method according to claim 3, wherein: and step S3, optimizing the compression amount of the sealing rubber strip when the compression amount of the door rubber strip does not meet the condition until the compression amount of the door rubber strip is more than 6 mm.
8. The car door closing sound quality inspection method according to claim 3, wherein: and step S3, optimizing the compression amount of the door frame adhesive tape until the compression amount of the door frame adhesive tape is more than 3mm when the compression amount of the door frame adhesive tape does not meet the condition.
9. The car door closing sound quality inspection method according to claim 3, wherein: and step S3, when the door sealing gap does not meet the condition, optimizing the door sealing gap until the door sealing gap meets the design requirement and is uniform.
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Cited By (1)
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| CN114486286A (en) * | 2022-01-12 | 2022-05-13 | 中国重汽集团济南动力有限公司 | Method and equipment for evaluating quality of door closing sound of vehicle |
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Application publication date: 20210205 |