Objective evaluation method of transmission whine noise

An objective evaluation method and transmission technology, applied in the direction of machine gear/transmission mechanism testing, etc., can solve the problems of low practicality, reduce the accuracy of objective evaluation, and the inability to directly obtain analysis results, etc., to achieve simple data analysis process and improve accuracy degree of effect

Inactive Publication Date: 2015-06-10
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology

In the existing methods, one is to use the difference between the total sound pressure level and the sound pressure level of the transmission howling order as an evaluation index, but the difference is not a value in the frequency domain, which cannot take into account the impact of sound frequency characteristics on human The influence of the ear, thereby reducing the accuracy of objective evaluation
Another method is to use the difference between the sound pressure level of the transmission howling order and its background noise as an evaluation index, but the calculation method of the background noise is very complicated, and it is often impossible to directly obtain the analysis results when using professional software analysis, which has low practicability

Method used

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  • Objective evaluation method of transmission whine noise
  • Objective evaluation method of transmission whine noise
  • Objective evaluation method of transmission whine noise

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing.

[0020] Such as figure 1 and figure 2 The objective evaluation method of transmission whistling noise comprises the following steps:

[0021] Step 1: Preparation of test conditions: Air conditioners, fans, radios, multimedia systems, doors, windows, and ventilation holes are all closed to ensure that the tire pressure of the vehicle is within the range specified in the manual. Install the noise test sensor in the passenger compartment, and connect the noise test sensor with the data acquisition and analysis system. The noise test sensor adopts PCB 377B02, two in total, arranged at the front seat and the rear seat respectively, see figure 2 .

[0022] Step 2, test: the car slides freely in each gear with uniform acceleration or uniform deceleration, and the noise test sensor collects the noise data in the car. While collecting noise data, a tachometer is required to co...

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Abstract

The invention discloses an objective evaluation method of transmission whine noise. The objective evaluation method of the transmission whine noise comprises the following steps: slicing a one-third octave spectrogram of a vehicle interior noise based on a transmission whine order to obtain a sound pressure level curve; calculating a difference between the obtained sound pressure level curve and the sound pressure level curve of the transmission whine order; using the obtained differential curve as an objective evaluation index for the transmission whine; finally, comparing the index with a qualified line to obtain an objective evaluation conclusion. The objective evaluation method of the transmission whine noise uses the parameterized evaluation index for objectively and precisely evaluating the subjective feeling of people to the transmission whine noise. Meanwhile, the objective evaluation method of the transmission whine noise is convenient in use, and high in practicality.

Description

technical field [0001] The invention belongs to the field of automobile NVH (Noise Vibration Harshness, noise vibration and harshness), and in particular relates to a new objective evaluation method for transmission whistling noise. Background technique [0002] As customers in the market have increasingly stringent requirements on vehicle quality, it is even more important to improve the NVH performance of vehicles. The optimization of transmission whistling noise is a major difficulty in improving the NVH performance of automobiles. In the process of transmission howling noise optimization, how to accurately and objectively evaluate the level of transmission howling noise is the first problem that needs to be faced. In the existing methods, one is to use the difference between the total sound pressure level and the sound pressure level of the transmission howling order as an evaluation index, but the difference is not a value in the frequency domain, which cannot take int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/02
Inventor 陈扬森彭国民余波罗贤能蓝军
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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