JP2019114114A - Vibration analysis device for panel member of vehicle - Google Patents

Abstract

To provide a vibration analysis device that improves the accuracy in vibration analysis on a panel member of a vehicle in a middle frequency region.SOLUTION: A vibration analysis device for a panel member of a vehicle including a storage device and a computing device. The storage device stores equivalent radiant power obtained by vibration simulation for multiple evaluation panels of all panel members to be subjected to vibration analysis, acoustic transfer function P/Qi measured for the multiple evaluation panels by experiment, and soundproof material skin vibration ratio γi measured for the multiple evaluation panels by experiment. The computing device calculates sound pressure sensitivity P/F for each panel member on the basis of the equivalent radiant power, the acoustic transfer function, and the soundproof material skin vibration ratio, and analyzes the contribution to sound production.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a panel vibration analysis device that performs vibration analysis such as calculation of sound pressure sensitivity of a panel member of a vehicle.

  In a vehicle such as an automobile, a panel member such as a floor panel vibrates when vibration is input from an engine or suspension, and noise is emitted from the panel member. May occur. Therefore, measures have been conventionally taken to reduce these vibrations and noises.

  As one of the measures to reduce the vibration and noise, it is well known that the simulation of vibration by the finite element method is performed and the equivalent radiation power ERP of each evaluation panel of the panel member is obtained from the result of the vibration simulation. For example, Patent Document 1 below is configured to create a vibration analysis model for analyzing the vibration generated in a panel member by calculating the equivalent radiation power of each evaluation panel of the panel member from the result of vibration simulation. A panel vibration analysis system is described.

JP, 2015-185142, A

[Problems to be solved by the invention]
The sound pressure sensitivity and the sounding contribution for the panel members of the vehicle depend on the frequency of the vibration. In particular, in the medium frequency region of 200 to 500 Hz, it has been found that the influence of the acoustic transfer function at each portion of the panel member and the vibration of the skin member of the panel member on the generation of the in-vehicle sound is significant. In the conventional panel vibration analysis device as described in Patent Document 1, there is a problem that the vibration analysis of the medium frequency region is not accurate because the acoustic transfer function and the vibration of the skin material are not taken into consideration.

  The object of the present invention is to calculate the sound pressure sensitivity based on the acoustic transfer function and the vibration of the skin material in addition to the equivalent radiation power based on the above-mentioned findings obtained by the inventor of the present invention. The accuracy of the vibration analysis of the panel member is improved.

[Means for Solving the Problems and Effects of the Invention]
According to the present invention, there is provided a vibration analysis apparatus (10) for a panel member of a vehicle comprising the storage means (12) and the calculation means (14), the storage means comprising the panel member to be subjected to the vibration analysis of the vehicle 20) Equivalent radiation power (ERP panel j) obtained by vibration simulation for a plurality of evaluation panels (24i), acoustic transfer functions (P / Qj) measured by experiments for a plurality of evaluation panels, and a plurality of evaluation panels The soundproofing material skin vibration ratio (γj) measured by the experiment is configured to be stored, and the computing means is configured to calculate the sound pressure sensitivity (Pl) of the panel member based on the equivalent radiation power, the acoustic transfer function and the soundproofing material skin vibration ratio. A vibration analysis device (10) of a panel member of a vehicle configured to calculate (F) is provided.

  According to the above configuration, the equivalent radiation power obtained by the vibration simulation for the plurality of evaluation panels of the panel member to be subjected to the vibration analysis of the vehicle, the acoustic transfer function and the soundproofing skins measured by the experiment for the plurality of evaluation panels The vibration ratio is stored in the storage means. The calculation of the sound pressure sensitivity for the panel member is performed by the calculation means based on the equivalent radiation power, the acoustic transfer function and the sound insulation skin vibration ratio.

  Therefore, the sound pressure sensitivity is calculated based on the equivalent radiation power ERP without considering the sound transfer function and the sound insulation material skin vibration ratio, and compared with the conventional vibration analysis apparatus in which the vibration analysis such as the sound generation contribution is performed. It is possible to perform sound pressure sensitivity calculation and vibration analysis with high accuracy.

  The "acoustic transfer function" is an acoustic transfer function between a measurement point (ear position) set in advance and the vicinity of each evaluation panel, and is a ratio of sound pressure at the measurement point to the volume acceleration. The “soundproof skin vibration ratio” is the ratio of the vibration amplitude of the soundproofing material to the vibrational amplitude of the panel in each evaluation panel of the panel member consisting of the panel formed of metal or the like and the soundproofing material joined thereto. . The “sound pressure sensitivity” is the ratio of the sound pressure to the external force input to the panel member, and is specifically calculated according to the equation (3) described later. "Sound pressure sensitivity" takes different values depending on the frequency of vibration.

  In the above description, in order to help the understanding of the present invention, the reference numerals used in the embodiments are attached in parentheses to the configuration of the invention corresponding to the embodiments to be described later. However, each component of the present invention is not limited to the component of the embodiment corresponding to the code attached in parentheses. Other objects, other features and attendant advantages of the present invention will be readily understood from the description of the embodiments of the present invention which is described with reference to the following drawings.

It is a schematic block diagram which shows the vibration-analysis apparatus of the panel member concerning embodiment of this invention. It is a perspective view showing a floor panel member as an example of a panel member of vehicles which should be analyzed by vibration analysis device. It is an enlarged fragmentary sectional view which shows the point which measures the vibration of the panel of a panel member, and a soundproof material. It is a flow chart which shows a control routine of calculation of sound pressure sensitivity and pronunciation contribution analysis in the embodiment. It is a graph which shows an example (solid line) of a relation between frequency [Hz] of vibration and sound pressure sensitivity P / F [dB] computed according to an embodiment with an actual measurement value (broken line). It is a graph which shows the example of the relationship between frequency [Hz] and sound pressure sensitivity P / F [dB] about the various panel members with the sound in a car. It is a top view which shows a sound generation level about each evaluation panel of a roof panel. It is a rear view which shows a pronunciation level about each evaluation panel of a windshield. It is a flow chart which shows a procedure and signal processing in case vibration analysis of a panel member of vehicles is performed using a vibration analysis device by an embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

  In FIG. 1, a vibration analysis device 10 of a panel member of a vehicle according to an embodiment of the present invention includes a storage device 12, an arithmetic device 14, a display device 16, and an input device 18. The storage unit 12 and the arithmetic unit 14 mutually exchange information as needed, and the input unit 18 is operated by the operator to input necessary data and commands to the storage unit 12 and the arithmetic unit 14. Although not shown in FIG. 1, the vibration analysis device 10 includes a hard disk and a RAM as the storage device 12, a CPU as the arithmetic device 14, a monitor as the display device 16, a keyboard and a mouse as the input device 18, etc. And a personal computer.

  FIG. 2 shows a part (front floor panel) of the floor panel member 20 as an example of a panel member of a vehicle to be subjected to vibration analysis by the vibration analysis device 10. The floor panel member 20 has a hook portion 20A extending in the vehicle longitudinal direction at a central portion in the vehicle width direction, and a side portion 20B extending upward at both side portions in the vehicle width direction. The floor panel member 20 is divided into a plurality of substantially rectangular evaluation panels 24i from i = 1 to i = n (a positive integer) by dividing lines 22 extending in the vehicle longitudinal direction and the vehicle width direction. The ○ marks 26 indicate the positions at which the acoustic transfer function P / Qi and the sound insulation material skin vibration ratio γi are to be measured. Although not shown in the drawings, other panel members of the vehicle to be subjected to vibration analysis are similarly divided into a plurality of evaluation panels. Other panel members include, for example, a roof panel, a windshield (front glass), a rear panel, and a side door.

  For example, a simulation of vibration when an external force F is input to the panel member is executed by the finite element method, and the storage device 12 stores the equivalent radiation power ERPpaneli of the panel member to be analyzed by the vibration simulation. ing. The simulation by the finite element method may be performed by storing the program on a hard disk and executing the program by the CPU, or may be performed by a device other than the panel vibration analysis device 10.

Although not shown in the figure, each evaluation panel 24i is divided into a plurality of elements from j = 1 to j = m (a positive integer). As well known, the equivalent radiation power ERPpaneli has the impedance of air as cc, the velocity component of each element as Vj (j = 1 to m), and the area of each element as Dj (j = 1 to m). It may be calculated according to equation (1) of

  Further, the storage unit 12 stores the acoustic transfer function P / Qi measured by an experiment on the evaluation panel 24i. The acoustic transfer function P / Qi is an acoustic transfer function between a preset measurement point (ear position) and the vicinity of each evaluation panel, and is a ratio of the sound pressure P at the measurement point to the volume acceleration Qi.

  Furthermore, the storage device 12 stores the soundproofing material skin vibration ratio γi (i = 1 to n) measured by an experiment on each evaluation panel 24i of the panel member to be subjected to vibration analysis. As shown in FIG. 3, the panel member 28 such as the floor panel member 20 is composed of a metal panel 30 and a soundproof material 32 formed of a synthetic resin or the like and joined to the panel 30. . By means of the accelerometer 34 mounted on the surface of the panel 30 and the accelerometer 36 mounted on the surface of the soundproofing material 32 at a position aligned therewith, the vibrations (amplitudes) Apaneli and Atrimi of the panel 30 and the soundproofing material 32 are respectively It measures about evaluation panel 24i. Then, the soundproofing material skin vibration ratio γi is calculated as a vibration amplification ratio Atrimi / Apaneli for each evaluation panel.

  For each evaluation panel 24i, the vibrations Apaneli and Atrimi may be measured at the measurement position 26 and a plurality of positions in the vicinity thereof, and the soundproofing material skin vibration ratio γi may be calculated as an average value of the respective vibration amplification ratios Atrimi / Apaneli. .

  Furthermore, the storage device 12 stores a control program corresponding to the flowchart shown in FIG. 4 described later. Arithmetic unit 14 executes the control program to determine the sound pressure sensitivity P / F of each panel member to be subjected to vibration analysis based on equivalent radiation power ERPpaneli, acoustic transfer function P / Qi and soundproofing material skin vibration ratio γi. Calculation and analysis of the pronunciation contribution. The display device 16 displays necessary information based on the control program, and also displays a message prompting the operator to input commands and data as needed.

  Next, the control routine of the calculation of the sound pressure sensitivity P / F and the analysis of the sound production contribution in the embodiment will be described with reference to the flowchart shown in FIG. The control according to the flowchart shown in FIG. 4 is executed when the start button of the control program displayed on the display device 16 is clicked. In the following description, control according to the flowchart shown in FIG. 4 is simply referred to as "control".

  First, in step 10, the operator operates the input device 18 to calculate the sound pressure sensitivity P / F and analyze the sound generation contribution, for example, the floor panel, the roof panel, and the front panel. Set in glass, rear panel, side door. The set panel members are stored in the storage unit 12.

  In step 20, it is determined whether or not the storage device 12 stores the equivalent radiation power ERPpaneli determined by the vibration simulation for all panel members set in step 10. When a positive determination is made, the control proceeds to step 40, and when a negative determination is made, the control proceeds to step 30.

  In step 30, a message is displayed on the display unit 16 prompting the user to enter the equivalent radiation power ERPpaneli that has not been input, and a standby for a predetermined time is performed, and then the control returns to step 20.

  In step 40, it is determined whether the storage unit 12 stores the acoustic transfer function P / Qi measured by experiment for all the panel members set in step 10. When a positive determination is made, the control proceeds to step 60, and when a negative determination is made, the control proceeds to step 50.

  In step 50, a message is displayed on the display unit 16 to prompt the user to enter the acoustic transfer function P / Qi which has not been input, and the process waits for a predetermined time, and then the control returns to step 40.

  In step 60, it is determined whether or not the storage device 12 stores the sound insulation material skin vibration ratio γi measured by experiment for all the panel members set in step 10. When a positive determination is made, the control proceeds to step 80, and when a negative determination is made, the control proceeds to step 70.

  In step 70, a message to prompt the user to input the sound insulation material skin vibration ratio γi is displayed on the display device 16, and a standby for a predetermined time is performed, and then the control returns to step 60.

In step 80, the average vibration Apanelai of each evaluation panel 24i is calculated according to the following equation (2) based on the equivalent radiation power ERPpaneli.

In step 90, based on the average vibration Apanelai of each evaluation panel 24i, the acoustic transfer function P / Qi, and the soundproofing material skin vibration ratio γi, various frequencies of, for example, 100 to 600 [Hz] according to the following equation (3) Sound pressure sensitivity P / F [dB] is calculated. The sound pressure sensitivity P / F is calculated for all panel members set in step S10.

  In step 100, the in-car sound [dB] is calculated as the sum of the sound pressure sensitivities P / F for all panel members set in step 10, and the relationship between the sound pressure sensitivities P / F of each panel member to the in-car sound The pronunciation contribution is analyzed as (degree of influence).

  In step 110, the relationship between the sound pressure sensitivity P / F calculated in step 90 and the in-vehicle sound obtained in step 100 and the frequency [Hz] is displayed on the display device 16. The operator may select an item to be displayed, a display mode, and the like by operating the input device 18.

  For example, the solid line in FIG. 5 shows an example of the relationship between in-vehicle sound [dB] and frequency [Hz] calculated according to the embodiment. The broken line in FIG. 5 is an actual measurement value, and it is understood that the in-vehicle sound based on the sound pressure sensitivity calculated according to the embodiment has a good correspondence with the actual measurement value even in the middle frequency band of 200 to 500 Hz. Therefore, according to the vibration analysis device 10 of the present invention, the relationship between the frequency and the in-vehicle sound can be accurately estimated.

  In addition, in FIG. 5, the vibration is analyzed based on the equivalent radiation power ERP without considering the acoustic transfer function and the sound insulation material skin vibration ratio like the vibration analysis device described in the above-mentioned patent document 1 The relationship between the frequency required by the vibration analysis device of and the vehicle interior sound is not shown. However, according to the vibration analysis device 10 of the present invention, the sound pressure sensitivity P / F is calculated using the acoustic transfer function and the sound insulation material skin vibration ratio in addition to the equivalent radiation power. In comparison, the sound pressure sensitivity P / F can be calculated with high accuracy, and the accuracy of vibration analysis can be increased.

  Further, FIG. 6 shows an example of the relationship between the sound pressure sensitivity P / F and the frequency [Hz] for various panel members together with the in-vehicle sound. In the case of the illustrated example, it is understood that the sounding contribution to the in-vehicle sound at 260 Hz is the highest for the roof panel, and the sounding contribution to the in-vehicle sound at 360 Hz is the highest for the windshield, ie, the windshield. By obtaining the relationship between the sound pressure sensitivity P / F and the frequency [Hz] for various panel members according to the embodiment from FIG. It can be identified.

  Furthermore, FIG. 7 is a plan view showing the sound generation level of each evaluation panel 24i of the roof panel 32, and FIG. 8 is a rear view showing the sound generation level of each evaluation panel 24i of the windshield 34. In FIG. 7 and FIG. 8, each evaluation panel 24 i is filled, but the higher the filling density, the higher the sounding level. It can be understood from FIGS. 7 and 8 that the magnitude of the pronunciation differs depending on the portion of the panel member. Therefore, by determining the sound generation level for each evaluation panel of various panel members according to the embodiment, it is possible to specify a portion where the sound generation is to be reduced with high accuracy.

  FIG. 9 is a flowchart showing a procedure and signal processing when vibration analysis of a panel member of a vehicle is performed using the vibration analysis device 10 according to the above-described embodiment.

  In step 210, equivalent radiation power ERPpaneli is calculated by executing vibration simulation when external force F is input to the panel member by the finite element method for all panel members of the vehicle to be subjected to vibration analysis. .

  In step 220, equivalent radiation power ERPpaneli for all panel members is input by the operator to the vibration analysis device 10 and stored in the storage device 12. When the vibration simulation and the calculation of the equivalent radiation power ERPpaneli are executed by the vibration analysis apparatus 10, the input by the operator is unnecessary.

  In step 230, the vibration analysis apparatus 10 calculates, for all panel members, the average vibration Apanelai of each evaluation panel according to the above equation (2) based on the equivalent radiation power ERPpaneli.

  In step 240, the acoustic transfer function P / Qi is measured by experiment for each evaluation panel of all panel members, and in step 250, the acoustic transfer function P / Qi is input to the vibration analysis apparatus 10 by the operator and stored. It is stored in the device 12.

  Similarly, in step 260, the sound insulation skin vibration ratio γi is measured by experiment for each evaluation panel of all panel members, and in step 270, the sound insulation skin vibration ratio γi is input to the vibration analysis apparatus 10 by the operator. And stored in the storage unit 12.

  Note that the execution order of steps 210 to 230, steps 240 and 250, and steps 260 and 270 is not limited to the above-described order, and average vibration Apanelai, acoustic transfer function P /, by the time step 280 described below is started. The Qi and the sound insulation skin vibration ratio γi may be stored in the storage device 12.

  In step 280, for all panel members, the sound pressure sensitivity P / F [in accordance with the above equation (3) based on the average vibration Apanelai of each evaluation panel 24i, the acoustic transfer function P / Qi, and the soundproofing material skin vibration ratio .gamma.i. dB] is calculated.

  In step 290, the in-car sound is calculated as the sum of the sound pressure sensitivities P / F for all panel members, and the sound pressure sensitivities P / F and in-car sounds and frequencies [Hz] for all panel members. Relationships are sought. Further, the sound generation contribution is analyzed as the relationship between the sound pressure sensitivity P / F of each panel member to the in-vehicle sound.

  In step 300, the sound pressure sensitivity P / F for all panel members, the relationship between the in-vehicle sound and the frequency [Hz], the sounding contribution of each panel member to the in-vehicle sound, and the like are displayed.

  From the above description, by using the vibration analysis device 10 of the embodiment, the method of vibration analysis of the panel member of the vehicle shown in FIG. 9 can be efficiently implemented, and the analysis result can be efficiently displayed. I understand.

  Although the invention has been described in detail with reference to particular embodiments, the invention is not limited to the embodiments described above, and various other embodiments are possible within the scope of the invention. Will be apparent to those skilled in the art.

  For example, in the above embodiment, in step 10, the operator operates the input device 18 to set the panel member of the vehicle on which the calculation of the sound pressure sensitivity P / F and the analysis of the sound generation contribution are to be performed. . However, when it is determined that the vehicle panel member on which the calculation of the sound pressure sensitivity P / F and the analysis of the sound generation contribution should be performed is determined, step 10 may be omitted.

  In the above-described embodiment, in steps 20, 40 and 60, it is determined whether or not the storage device 12 stores the equivalent radiation power ERPpaneli, the acoustic transfer function P / Qi, and the sound insulation material skin vibration ratio γi. To be done. However, if the operator inputs the equivalent radiation power ERPpaneli, the acoustic transfer function P / Qi, and the sound insulation material skin vibration ratio γi and then calculates the sound pressure sensitivity P / F and analyzes the sound generation contribution, steps 20 to 70 are performed. May be omitted.

  Furthermore, in the above-described embodiment, in step 90, the sound pressure sensitivity P / F is calculated according to the above equation (3) using an absolute value of (Apanelai / F) × Si, an absolute value of P / Qi and an absolute value of γi. Calculated as the sum of squares of products. However, at least one of the three absolute values may be multiplied by the weighting factor.

DESCRIPTION OF SYMBOLS 10 ... Vibration analysis apparatus, 12 ... Storage apparatus, 14 ... Arithmetic apparatus, 16 ... Display apparatus, 18 ... Input apparatus, 20 ... Floor panel member, 22 ... Division line, 24i ... Evaluation panel, 28 ... Panel member, 32 ... Soundproof Material

Claims (1)

In the vibration analysis apparatus for a panel member of a vehicle comprising a storage means and a calculation means, the storage means is equivalent radiation power obtained by vibration simulation for a plurality of evaluation panels of the panel member to be subjected to a vibration analysis of the vehicle; The acoustic transfer function measured by experiment for the plurality of evaluation panels and the sound insulation material skin vibration ratio measured by experiment for the plurality of evaluation panels are configured to be stored, and the calculation unit is configured to calculate the equivalent radiation power An apparatus for analyzing vibration of a panel member of a vehicle configured to calculate sound pressure sensitivity for the panel member based on the acoustic transfer function and the sound insulation skin frequency.

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