JP2002131042A - Noise measure system of rolling sound - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the remarkable roughness of the tread of a wheel from the vibration value of a rail and the magnitude of noise along a railway line to perform the measure. SOLUTION: The inventor and his followers finds correlation of the vibration value of the rail due to rolling of the wheel and the magnitude of the noise measured by a noise sensor. The noise measure system of rolling sound is constituted of a vibration acceleration sensor 3 installed on the rail 1, a noise sensor 4 installed at a proper part along the rail 1, and a judging device for judging the remarkable roughness of the tread of the wheel from the measured value of the vibration acceleration sensor 4 and the measured value of the noise sensor 4. Thus, in the case that the vibration acceleration of the rail and a noise level exceed respective threshold values, the remarkable roughness of the tread of the wheel can be surely detected by judging that the remarkable roughness of the tread of the wheel of flat wear and the like exists.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting significant roughness of a wheel tread when a wheel contacts a rail by a vibration acceleration sensor installed on the rail and a noise sensor installed at an appropriate position along the rail. The present invention relates to a rolling noise suppression system for instructing grinding of a wheel when it is determined that the roughness is large, thereby reducing the rolling noise.

[0002]

2. Description of the Related Art For example, when a brake is operated while a vehicle is running, the wheels are locked when the braking force is too strong, or on a track with many rainfalls or falling leaves, and the rotation of the wheels is stopped. And slides on the rail, causing flat wear parallel to the tangent to the rail on the wheel tread. This flat abrasion generates an impact sound at the moment of contact with the rail with the rotation of the wheel, causing a noise along the road due to the rolling noise of the wheel. Therefore, when there is significant roughness of the wheel tread such as flat wear, it has been necessary to detect this and take countermeasures. As a method of eliminating flat wear, a sliding control device for wheels has been provided, but it is not provided in all vehicles because it is extremely expensive, and it has not been completely eliminated. Was the current situation.

Therefore, conventionally, a vibration acceleration sensor is installed on the rail to measure the vibration of the rail, and when the vibration exceeds a certain threshold value corresponding to the train speed, the wheel tread becomes extremely rough. A flat detection device that determines that there is is provided in some places. When a significant vibration value is detected, the worker visually inspects the tread surface of the corresponding wheel and grinds the wheel tread surface when it is confirmed that the flaw of the wheel tread surface is larger than a predetermined size. Processing was performed to make the wheel treads perfectly round. As described above, in the related art, the measurement of the rail vibration by the vibration acceleration sensor and the inspection of the flaw of the wheel tread surface by the operator's visual inspection have been performed to detect the significant roughness.

[0004]

However, in a conventional method for detecting a significant roughness of a wheel tread using a flat detecting device and also using a visual inspection of an operator, the flat detecting device is disclosed. It was found that there was no clear correlation between the magnitude of the vibration acceleration (vibration value) due to the size of the flaw on the wheel tread and the magnitude of the vibration acceleration, and it was judged that the wheel tread was extremely rough from the magnitude of the vibration acceleration In some cases, the determination method using the flat detection device cannot solve the roadside noise caused by the rolling noise of the wheels. Therefore, in response to regular inspections and reports of abnormal impact sounds from crew members and passengers, the wheel treads are visually inspected by the worker, and the wheel treads are ground based on the determination results. Was the current situation. Therefore, it has not been possible to quantitatively and reliably detect significant roughness of the wheel tread surface, and the problem of the roadside noise of wheel rolling noise caused by this has not been fundamentally solved.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems and has been improved and eliminated. The present invention has been developed to reduce the large roughness of the wheel tread surface from the vibration value of the rail and the magnitude of the noise along the railway. It is an object of the present invention to provide a noise countermeasure system that detects and takes countermeasures to reduce the rolling noise of wheels.

In order to solve the above-mentioned problems, the present invention employs a vibration acceleration sensor installed on a rail, a noise sensor installed at an appropriate position along the rail, and measurement of these vibration acceleration sensors. This is a noise reduction system for rolling noise, which comprises a judgment device for judging significant roughness of the wheel tread from the values and the values measured by the noise sensor. The present invention has found that there is a correlation between the vibration value of the rail due to the rolling of the wheel and the magnitude of the noise measured by the noise sensor. When the vibration value and the noise level of the rail exceed the respective threshold values, it is determined that the wheel tread is extremely rough, such as flat wear. After that, ordinary measures may be taken, and grinding of the wheel tread, which is extremely rough, can be performed, and the problem of the roadside noise due to the rolling noise can be solved.

Further, according to a second aspect of the present invention, when the measured value of the vibration acceleration sensor and the measured value of the noise sensor exceed respective thresholds corresponding to the speed of the corresponding train, the wheel tread surface is determined. 2. The rolling noise suppression system according to claim 1, wherein the system is determined to be extremely rough. Since the vibration value of the rail and the noise level along the railroad change for each train (type) depending on the speed of the train, threshold values corresponding to these speeds and train types are required,
Makes accurate decisions possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the embodiments of the invention shown in the drawings. FIG. 1 is a schematic basic configuration diagram for explaining the basic principle of the device of the present invention. As shown in the figure, in this embodiment, an ID antenna 2 for reading train information is erected near a rail 1 behind an arbitrarily set measurement point, and is mounted on the rail 1 at the measurement point. The acceleration sensor 3 is attached. Further, a microphone 4 for detecting noise is set up near the rail 1 at the measurement point. The train information is transmitted from the communication device 6 installed at the lower part of the side of the train 5,
The composition number is transmitted.

The train information received by the ID antenna 2, the magnitude of the acceleration (acceleration value) measured by the acceleration sensor 3, and the magnitude of the noise (noise level) measured by the microphone 4 Is sent to the personal computer 7 for the measurement process in the wired system or the wireless system, and a predetermined arithmetic process is performed. The result can be displayed on a display device such as a cathode ray tube. Further, data is transmitted to the computer 8 of each district via online as needed.

Next, an operation mode of the noise reduction system for wheel rolling noise configured as described above will be described. First, train 5
When the vehicle approaches the ID antenna 2, the train information transmitted from the communication device 6 is received by the ID antenna 2, taken into the personal computer 7, and the train 5 is specified. Subsequently, the measurement data of the vibration acceleration sensor 3 at the measurement point is taken into the personal computer 7. Similarly, noise data measured by the microphone 4 at the measurement point is taken into the personal computer 7. FIGS. 2 to 4 show the vibration acceleration at the measurement point, the measurement point, and 15.6 m from this point when a high-speed train composed of 221 series 8-car trains passes at 89 km / h.
It shows the noise level at a distant point (a point 18.3 m away from the center of the orbit). FIG. 5 is a drawing showing the relationship between the rail acceleration (the maximum value for two weeks at the same point) and the peak noise level at the measurement point.

As apparent from FIG. 5, the present inventors have found that the vibration acceleration of the rail has a correlation with the peak level of noise. That is, the relationship between the vibration acceleration of the rail and the peak level of the noise appears as a group of measured data, and it is clear that there is a certain correlation. In order to clarify what the correlation is, the present inventors simultaneously record the vibration acceleration and the noise level, record the sense of hearing the noise due to human hearing as data, and record the noise along the roadside. The subjects of the noise level considered to be the problem of the above were listed up, and the rail vibration acceleration of the wheel to be measured at that time was compared with the measured noise level to analyze the correlation. According to this, the rail vibration acceleration that occurs when the measurement target wheel comes into contact with the rail when it is considered that a problem of the wayside noise will be caused by human hearing is 50 G or more. The noise level was M + 2σ, where M is the average value. The meaning of the parameter of 2σ is in the range of 95.5% of all data, and M + 2σ
The data that exceeds is very small, only about 2%,
The idea is that it hardly occurs.

Accordingly, in the personal computer 7 shown in FIG. 1, the peak value of the measurement signal transmitted from the acceleration sensor 3 exceeds 50 G, and the noise level transmitted from the microphone 4 exceeds M + 2σ. If it is picked up, it is possible to reliably detect significant roughness of the wheel tread surface such as flat wear. And
In this way, for the wheels corresponding to the trains that have been found to have extremely rough wheel treads, the treads are ground and processed to become a perfect circle. As a result, as for the impact noise due to the contact between the wheel tread surface and the rail, a loud noise that causes the problem of the wayside noise is not generated, and the problem of the wayside noise due to the rolling noise can be solved.

[0013]

As described above, the present invention has found that there is a correlation between the vibration value of the rail due to rolling and the magnitude of the noise measured by the noise sensor. , A noise sensor installed in the right place along the rail, and a judgment device that judges the presence or absence of a flat wheel tread from the measured values of these vibration acceleration sensors and the noise sensor Was configured. Therefore, when the vibration acceleration and the noise level of the rail exceed the respective threshold values, it is determined that the wheel tread is extremely rough, such as flat wear, so that the wheel tread is significantly roughened. Can be detected at the same time.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an entire system according to an embodiment of the present invention.

FIG. 2 is a view showing measured data of rail vibration acceleration according to the present invention.

FIG. 3 is a drawing showing measurement data of a noise level at a measurement point according to the present invention.

FIG. 4 is a diagram showing noise level measurement data at a point 18.3 m away from a measurement point according to the present invention.

FIG. 5 is a diagram illustrating a correlation between a rail vibration acceleration and a noise level according to the present invention.

[Explanation of symbols]

1 ... rail, 2 ... ID antenna, 3 ... acceleration sensor,
4: Microphone, 5: Train, 6: Communication equipment, 7: Personal computer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazunori Oda 2-4-2, Shibata, Kita-ku, Osaka-shi West Japan Railway Company F-term (reference) 2F068 AA36 CC03 KK16 TT01 2F069 AA60 BB27 DD30 GG04 GG09 GG19 GG56 GG59 GG72 HH30 JJ17 MM26 NN13

Claims (2)

[Claims] 1. A vibration acceleration sensor installed on a rail,
A rolling noise suppression system consisting of a noise sensor installed at an appropriate position along the rail, and a judgment device that judges the severe roughness of the wheel tread from the measurement values of these vibration acceleration sensors and the noise sensor. . 2. The apparatus according to claim 1, wherein when the measured value of the vibration acceleration sensor and the measured value of the noise sensor exceed respective threshold values corresponding to the speed of the corresponding train, the wheel tread becomes extremely rough. The rolling noise suppression system according to claim 1, wherein the system determines that there is a rolling noise.