Transmission whistle NVH (Noise Vibration Harshness) performance offline detection method

Abstract

The invention discloses a transmission whistle NVH (Noise Vibration Harshness) performance offline detection method. The adopted offline detection system comprises a sensor and an offline detection device with an offline analyzer and the sensor is electrically connected with the offline analyzer. The offline detection method comprises steps of mounting a to-be-detected transmission and the sensor,simulating acceleration and deceleration working conditions under different gears and acquiring order vibration displacement-rotation speed curves in acceleration and deceleration working conditionsunder each gear and judging whether the whistle NVH performance of the to-be-detected transmission is qualified. The offline detection method can highlight the middle and low frequency peak characteristics of the transmission whistle and weaken the high frequency characteristics, and consistency with whole real vehicle whistle characteristic feeling is realized.

Description

technical field [0001] The invention belongs to the technical field of automobile NVH (Noise Vibration Harshness, that is, noise, vibration and harshness) detection, and in particular relates to an off-line detection method of transmission whistling NVH performance. Background technique [0002] Transmission whine is one of the key NVH issues complained by customers. The current consistent control measures for transmission whine performance in the industry mainly use the control of components, which consumes a lot of manpower and material resources and has little effect. At the same time, the detection ability is usually It cannot meet the high-volume and high-frequency detection requirements of mass production. [0003] In the existing transmission off-line detection methods: one part is to control the transmission in the form of order spectrum, and howling is a relationship curve between order and speed change. The order spectrum can only represent a maximum value and cann...

AI Technical Summary

Problems solved by technology

[0002] Transmission whine is one of the key NVH issues complained by customers. The current consistent control measures for transmission whine performance in the industry mainly use the control of components, which consumes a lot of manpower and material resources and has little effect. At the same time, the detection ability is usually It cannot meet the high-volume and high-frequency detection requirements of mass production

[0003] In the existing transmission off-line detection methods: one part is to control the transmission in the form of order spectrum, and howling is a relationship curve between order and speed change. The order spectrum can only represent a maximum value and cannot contain all speeds. The detailed features within the range are likely to cause a large number of misjudgments; the other part is to use vibration acceleration as the howling characteristic parameter to control, such as a kind of off-line detection of vibration noise of automobile transmission disclosed in the patent application with publication number CN106092310A method, which extracts the effective feature information of the vibration signal and the speed signal, and uses the method of self-learning and speed interval diagnosis to automatically analyze whether the transmission has vibration and noise defects

However, this method of off-line detection of vibration and noise still has the following problems: (1) It is necessary to divide the speed range of the concerned characteristic order, and the vibration acceleration increases with the speed. The characteristics are weak, and the main complaints of the vehicle's howling are concentrated in the middle and low frequency stage, resulting in a large gap between the detection situation and the performance of the real vehicle, which cannot be effectively controlled, resulting in repeated occurrence of the howling consistency problem; (2) Failure to check the off-line testing platform It is easy to cause inaccurate test results; (3) The reference value of the vibration and noise index (that is, the reference spectral line) is self-study based on the principle of mathematical statistics, and the actual performance acceptance assembly is not used as a reference value. It is easy to cause large-scale misjudgment

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