NVH analysis device

Abstract

To provide an NVH analysis device that can perform an evaluation and a good or bad determination about a noise component not based on a gear ratio.SOLUTION: An NVH analysis device 100 acquires a frequency, a rpm and a sound pressure detected from an object X. The NVH analysis device 100 generates a map of a two-dimensional coordinate system using the frequency as one coordinate axis and the rpm as the other coordinate axis, in which the sound pressure corresponding the frequency and the rpm is mapped at each coordinate. The NVH analysis device 100 sets one or more areas on the map. The NVH analysis device 100 sets a face standard for each one or more areas, and outputs a maximum sound pressure in the area. The NVH analysis device 100 implements a good or bad determination of the object X on the basis of the face standard set for each one or more areas, or the maximum sound pressure in the area output for each one or more areas.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an NVH (Noise, Vibration, Harshness) analysis device. [Background technology]

[0002] The technology of Patent Document 1 discloses a measurement method capable of classifying the factors affecting gear noise into gear-related parts and other parts. In this technology, the factors affecting gear noise are classified into gear factors and other factors based on the similarity or dissimilarity of the rotation order ratio analysis waveform shape in each frequency range. In this technology, the signal waveforms of the sound and the speed fluctuation are compared by the rotation speed, so that it is possible to classify whether the gear noise requiring countermeasures is strongly influenced by the gear-related parts or is influenced by other factors. This makes it possible to take appropriate measures to reduce the gear noise. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-257685 A Summary of the Invention [Problem to be solved by the invention]

[0004] The technology disclosed in Patent Document 1 can evaluate and judge the pass / fail of a tracking order based on a specific gear ratio, but has a problem in that it cannot evaluate and judge the pass / fail of noise components that are not based on the gear ratio.

[0005] In consideration of such problems, the present disclosure has an object to provide an NVH analysis device that can evaluate and determine the acceptability of noise components that are not based on the gear ratio. [Means for solving the problem]

[0006] The NVH analysis device of the present disclosure is Acquire the frequency, rotation speed, and sound pressure detected from the target; A map of a two-dimensional coordinate system is generated, with the frequency as one coordinate axis and the rotation speed as the other coordinate axis, and the sound pressure corresponding to the frequency and the rotation speed is arranged on each coordinate. Setting one or more regions on the map; A surface standard is set for each of the one or more areas, and the maximum sound pressure within the area is output; A pass / fail judgment of the object is performed based on a surface standard set for each of the one or more regions and a maximum sound pressure within the one or more regions output for each of the one or more regions. Effect of the Invention

[0007] The present disclosure makes it possible to provide an NVH analysis device that can evaluate and judge the acceptability of noise components that are not based on gear ratio. [Brief description of the drawings]

[0008] [Figure 1] FIG. 4 is a diagram showing a problem in a comparative example of the NVH analysis device according to the first embodiment. [Diagram 2] 1 is a diagram showing an example of the configuration and operation of an NVH analysis device according to a first embodiment. [Diagram 3] FIG. 2 is a diagram showing an example of analysis data of the NVH analysis device according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and duplicated descriptions will be omitted as necessary for clarity of explanation.

[0010] First, a problem in a comparative example (e.g., the technology according to Patent Document 1) of the NVH analysis device 100 according to the first embodiment will be specifically described with reference to Fig. 1. Fig. 1 is a diagram showing the problem in the comparative example of the NVH analysis device 100 according to the first embodiment.

[0011] As shown in FIG. 1, the comparative example had a problem that it could evaluate and judge the pass / fail of the tracking order based on a specific gear ratio, but could not evaluate and judge the pass / fail of noise components that are not based on the gear ratio. As examples, there are the following two problems. 1) It has been confirmed that gears produced by tooth surface grinding, which is a technology for improving the tooth surface precision, generate NVH due to micron-level irregularities. It has been confirmed that this NVH is not based on the gear ratio, and a method for evaluating and judging the pass / fail is necessary, but the technology related to the comparative example cannot evaluate and judge the pass / fail. 2) It is necessary to manage areas and features that are not based on the gear ratio (i.e., they change for each unit) and areas and features that suddenly deteriorate (e.g., NVH caused by Brg failure) because it is not possible to manage them, but a method for managing them is necessary, but the technology related to the comparative example cannot manage them.

[0012] In the following embodiment, by taking such a problem into consideration, an object is to provide an NVH analysis device 100 that can evaluate and judge the acceptability of noise components that are not based on the gear ratio.

[0013] (First embodiment) Next, the configuration and operation of the NVH analysis device 100 according to the first embodiment will be described with reference to FIG. 2 is a diagram showing an example of the configuration and operation of the NVH analysis device 100 according to the first embodiment. As shown in FIG. 2, the NVH analysis device 100 of the present disclosure includes a microphone 1, an acceleration pickup 2, a measuring device 3, and analysis software 4.

[0014] The microphone 1 detects sound from an object (eg a gear) X and provides a sound signal representative of the detected sound to a measuring device 3 . The acceleration pickup 2 detects vibrations from the object X and supplies a vibration signal representing the detected vibrations to a measuring instrument 3 . The measuring instrument 3 detects rotation from the object X and obtains a rotation pulse signal representing the detected rotation. The measuring instrument 3 also obtains a sound signal of the object X from the microphone 1 and a vibration signal of the object X from the acceleration pickup 2.

[0015] The analysis software 4 performs a pass / fail judgment of the object X based on the sound signal, vibration signal, and rotation pulse signal of the object X acquired by the measuring device 3 as follows. First, the analysis software 4 generates (maps) a map of a two-dimensional coordinate system with frequency (Hz) on one axis and rotation speed (rpm) on the other, based on the sound signal, vibration signal, and rotation pulse signal of the object X, and arranges sound pressure (dB) corresponding to frequency and rotation speed on each coordinate. Specifically, the analysis software 4 generates a color map as shown in Fig. 2, in which the rotation speed (rpm) is shown on the vertical axis, the frequency (Hz) is shown on the horizontal axis, and the sound pressure (dB) corresponding to the frequency and rotation speed is shown as brightness on each coordinate. Next, the analysis software 4 sets regions A1 to C4 (regions A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, and C4) on the mapped map.

[0016] Next, the analysis software 4 sets a standard for each of the areas A1 to C4. The standard is also called a surface standard, and is a reference value for the sound pressure in each area. The analysis software 4 also outputs the maximum sound pressure in each of the areas A1 to C4.

[0017] Next, the analysis software 4 performs a standard evaluation for each of the regions A1 to C4. More specifically, the analysis software 4 determines whether or not the maximum sound pressure in each of the regions A1 to C4 satisfies the set standard. The analysis software 4 also calculates the process capability for each of the regions A1 to C4. Then, the analysis software 4 performs a process capability evaluation for each of the regions A1 to C4. More specifically, the analysis software 4 determines whether or not the process capability satisfies a predetermined standard for each of the regions A1 to C4.

[0018] Next, the analysis software 4 performs a pass / fail judgment of the object X based on the standard evaluation and the process capability evaluation for each of the regions A1 to C4. In detail, the analysis software 4 judges the object X to be a pass / fail product when the maximum sound pressure in each of the regions A1 to C4 meets the set standard and when the process capability meets the predetermined standard. On the other hand, the analysis software 4 judges the object X to be a defective product in other cases. The analysis software 4 may judge the object X to be a pass / fail product when the maximum sound pressure in each of the regions A1 to C4 meets the set standard or when the process capability meets the predetermined standard. On the other hand, the analysis software 4 may judge the object X to be a defective product in other cases.

[0019] Next, an example of the pass / fail judgment of the object X in the NVH analysis device 100 according to the first embodiment will be described with reference to FIG. 3. FIG. 3 is a diagram showing an example of the pass / fail judgment of the object X in the NVH analysis device according to the first embodiment. FIG. 3 shows the data values ​​of the specification (dB) and Cpk3σ (process capability index) for each of the regions A1 to C4. FIG. 3 also shows a plot diagram in which the data values ​​(n=24) of the maximum sound pressure (dB) in each of the regions A1 to C4 are plotted, and the average value and 3σ range of the maximum sound pressure data in each of the regions, as well as the specification set for each of the regions, are shown. FIG. 3 also shows the data values ​​of the specification margin (specification-average value-3σ range) for each of the regions A1 to C4. For example, in the region A1, the specification margin (specification-average value-3σ range) is 12.1, which is equal to or greater than a predetermined threshold (for example, the threshold is 0). Similarly, in areas A2 to C4, the specification margin (specification-average-3σ range) is equal to or greater than the predetermined threshold. Therefore, it is determined that the maximum sound pressure in all of areas A1 to C4 meets the set specification. Furthermore, in area A1, Cpk3σ is 3.50, which is equal to or greater than the predetermined threshold (e.g., threshold is 1.33). Similarly, in areas A2 to C4, Cpk3σ is equal to or greater than the predetermined threshold. Therefore, it is determined that the process capability meets the predetermined standard in all of areas A1 to C4. Therefore, in the example of FIG. 3, object X is determined to be a non-defective product.

[0020] As described above, the NVH analysis device 100 according to the first embodiment performs evaluation and pass / fail judgment of the object X using a surface standard, not a line standard as in the comparative example. Therefore, the NVH analysis device 100 can also evaluate and pass / fail judgment on noise components that are not based on the gear ratio.

[0021] Each component of the NVH analysis device 100 in the above-described embodiment is configured by hardware or software, or both, and may be configured by one piece of hardware or software, or may be configured by multiple pieces of hardware or software.

[0022] Specifically, each component of the NVH analysis device 100 in the above-described embodiment is configured by a computer including a processor and a memory. The processor may be, for example, a microprocessor, a micro processing unit (MPU), or a central processing unit (CPU). The processor may include multiple processors. The memory is configured by a combination of a volatile memory and a non-volatile memory. The memory may include a storage located away from the processor. In this case, the processor may access the memory via an I / O interface not shown. The processor executes one or more programs including a group of instructions for causing the computer to execute the algorithm described with reference to the drawings.

[0023] The program includes a set of instructions (or software code) that, when loaded into a computer, causes the computer to perform one or more functions described in the embodiments. The program may be stored in a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, the computer-readable medium or tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray® disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The program may be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, the transitory computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0024] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention. As in the above embodiment, the NVH analysis device 100 according to the first embodiment is not limited to the areas A1 to C4, and it is sufficient that at least one area is set. [Explanation of symbols]

[0025] 1 microphone, 2 acceleration pickup, 3 measuring instrument, 4 analysis software, 100 NVH analysis device, X target, A1~C4 area

Claims

[Claim 1] Acquire the frequency, rotation speed, and sound pressure detected from the target; a map of a two-dimensional coordinate system having the frequency as one coordinate axis and the rotation speed as the other coordinate axis, the map being arranged so that the sound pressure corresponding to the frequency and the rotation speed is arranged on each coordinate; Setting one or more regions on the map; A surface standard is set for each of the one or more areas, and a maximum sound pressure within the area is output; A pass / fail judgment is performed on the object based on a surface standard set for each of the one or more regions and a maximum sound pressure outputted within each of the one or more regions. NVH analysis device.

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