JPS5853574Y2 - Gear noise evaluation sensory education device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gear noise evaluation sensory training device for inspectors who evaluate gear noise.

Conventionally, noise specific to actual vehicles, such as differential noise, has been ranked based on sensory tests, but in reality, the magnitude of actual vehicle noise felt by people is determined by the suddenness of the sound rather than the sound level itself. Because gear noise is greatly influenced by changes in gear noise, noise around the vehicle, and vehicle acceleration conditions, the evaluation of gear noise by sensory evaluation inspectors is also likely to vary due to noise other than gear noise. In order to prevent variations, it is necessary to practice a considerable amount of G++ on a daily basis, but there is a limit to the amount of training that can be done using an actual vehicle, and as a result, it takes a considerable number of years to be recognized as an inspector for sensory evaluation. There were some drawbacks, such as the need for

The purpose of the present invention is to provide a gear noise evaluation sensory training device that can train sensory evaluation inspectors in a short period of time and improve the accuracy and reliability of sensory evaluation. The purpose is to eliminate shortcomings.

Next, the configuration of an embodiment of the present invention will be explained with reference to the drawings.

When analyzing the gear noise generated by the differential gear in each speed range during actual vehicle operation, it is found that in addition to the frequency determined by the gear rotation speed and number of teeth, harmonics based on this frequency are also included. Since the frequency that humans perceive as noise is in a relatively low frequency range, the pseudo gear noise oscillator uses not only the fundamental wave but also the second wave in the low speed range (approximately 5 QKm).
A pseudo gear noise oscillator compatible with the 3rd harmonic, in the medium speed range (approximately 90km), only a pseudo gear front oscillator compatible with the 2nd harmonic is required, and as a result, in the low speed range, 300 Hz, 600±, 900 Hz Pseudo gear front oscillators OL 1 and OL 2. Office lady 3,
The pseudo gear front oscillators OMI and OM2 output frequencies of 500 Hz and 800 Hz in the medium speed range, and the pseudo gear front oscillator OH1 outputs a frequency of 600 Hz in the high speed range. VR6, on/off switch SW1~SW
6. Mixing amplifier MAL, MAM, variable resistor VR7
It is connected to fixed contacts Ll, Ml, Hl for each speed range of rotary switch R3W1 via VR8.

The main amplifier AMI connected to the movable contact CNI of this rotary switch R5W1 via the resistor R1 has a resistor R.
In addition to the headphone HPI connected through 2. variable resistors VR18, VR9, VR10 for each speed range, and each contact L of rotary switch R8W1. M2. H
2, CN 2, meter amplifier AM2, and variable resistor VR11 for each speed range.

VR12, VR13, each contact L of rotary switch R3W1 3. M3. An output level display meter M1 corresponding to the headphone HPI is connected via H3 and CN 3, and the input side of the main amplifier AMI is connected to the input side of the main amplifier AMI. Tape recorder TR that plays back tapes recorded at both ears of the sensory evaluation examiner while sitting at the seat.
D is connected via variable resistor VR14, on/off switch SW7, and resistor R3, and variable resistor VR15, VR
16, VR17 Rotary switch R3W1 contact L
4. M4. The output terminal of the pseudo acceleration simultaneous oscillator OAC whose oscillation frequency is switched for each speed range via H4 and CN4 is connected via the CdS photocoupler PHC, and the power supply terminal of this pseudo acceleration simultaneous oscillator OAC is connected to the on/off switch SW8. DC power supply circuit POW with DC12V output via
It is connected to the.

Next, the operation of this embodiment will be explained.

First, with switch SW8 and rotary switch R3W1 of the pseudo acceleration simultaneous oscillator OAC in the OFF position, the sensory evaluation examiner turns on the headphone HPI and turns on switch SW7.
Pl is input with the playback sound from the tape recorder TRD, that is, the background noise inside the car while the car is running other than the gear noise that can be heard by the inspector during the sensory evaluation. Pseudo gear noise oscillator 0' for each speed range corresponds to an arbitrary rank selected from, for example, 12 ranks, in which 1, 5 to 2.0 dB, which is said to be the limit of the discrimination threshold, is set as one rank. L 1 ;O
L 2. Office lady 3. OM1. OM2. OH1 and mixing amplifier MAL, MAM variable resistance VRI~VR
8, and turn on the switches SW1 to SW6 appropriately in accordance with each speed range and arbitrarily selected harmonic.

In this adjustment completed state, the operator sequentially switches the rotary switch R5W1 to the low speed, medium speed, and high speed ranges in response to the actual vehicle driving, and turns on and off the switch SW8 of the pseudo acceleration simultaneous oscillator OAC during each speed range. , tape recorder T via variable resistor VR14.
The output of the background noise from the RD is also changed, and the sensory evaluation inspector is asked to answer the rank of the differential noise felt at each time point. Accurate sensory evaluation ability is achieved by comparing the rank answered by the test shell and the rank operated by the operator. In addition to being able to train in a short period of time, taking this sensory evaluation test also prevents unevenness in one's own sensory evaluation and also prevents individual differences in sensory evaluation due to each test shell. I can do that.

Next, the effects of the present invention will be explained.

This invention uses a pseudo gear noise oscillator that generates a frequency output corresponding to the gear noise generated during vehicle operation at each preset vehicle speed, and a pseudo gear noise oscillator that reproduces prerecorded background noise inside the vehicle while the vehicle is running other than gear noise. a background noise regenerator, and a speaker, for example, a headphone HP1, which inputs the outputs from the arbitrarily selected pseudo gear noise oscillator and the background noise regenerator set and mixed at a level corresponding to an arbitrary evaluation value. There is a gear noise evaluation sensory education device equipped with each of these.

As a result, this invention not only enables the training of sensory evaluation inspectors in a short period of time, but also has the effect of preventing individual differences in sensory evaluation and significantly improving the accuracy and reliability of sensory evaluation. .

[Brief explanation of the drawing]

The drawing is an electrical circuit diagram of an embodiment of the present invention. OL 1, OL 2. Office lady 3. OM1, OM
2. OH1...Pseudo gear noise oscillator, TRD・
...Tape recorder, MAL, MAM...
・Mixing amplifier, vR1 to VR6, VR14...
...Variable resistor, R5W 1...Rotary switch, AMl...Main amplifier, HPI...
...Headphones.

Claims (1)

[Scope of utility model registration request] A pseudo gear noise oscillator that generates a frequency output corresponding to the gear noise generated during vehicle operation at each preset vehicle speed, and a background noise reproduction that reproduces pre-recorded background noise inside the vehicle while driving other than gear noise. and a speaker that inputs outputs from the arbitrarily selected pseudo gear noise oscillator and the background noise regenerator set and mixed at a level corresponding to an arbitrary evaluation value. Gear noise evaluation sensory education device.