JP3176772B2 - Extraction device of vibration wave by tracked track - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle passing through a specific area, that is, an endless track of a tracked vehicle or a tire of a wheeled vehicle and an engine mounted on these vehicles (hereinafter referred to as "sounding body"). ) By detecting vibration waves or sound waves (hereinafter simply referred to as “vibration waves”) and analyzing the characteristics of the vibration waves to determine the vehicle category of the sounding body and to determine the infinity of the tracked vehicle.
The present invention relates to a device for extracting an orbital vibration wave.

[0002]

2. Description of the Related Art Conventionally, techniques in such a field include:
For example, there is one disclosed in Japanese Patent Application Laid-Open No. 5-79898, in which a vibration sensor detects a vibration wave generated by a sounding body, and a vibration wave generated by an endless track of a tracked vehicle and a vibration wave generated by a tire of a wheeled vehicle. Focusing on the fact that the vibration wave generated by the engine and the frequency of the main energy are different from each other, the frequency band in which the main energy of the vibration wave exists is divided into a plurality of parts, and the vibration wave in these divided frequency bands is set. Based on the relative levels of the main energies, the vehicle type classification of the sounding body was performed.

FIG. 8 is a block diagram of such a conventional intruder vehicle detecting device.

As shown in FIG. 1, a vibration wave S1 generated from a sounding body 1 is detected by, for example, a vibration sensor 2 provided in the ground, converted into an electric signal, and an analog electric signal S2 is output from the vibration sensor 2. Is output. This electric signal S
The signal 2 is amplified to a required level by a transmitter 3 and further modulated and amplified as necessary, and sent as a detection signal S3 to a receiver 4 via a transmission system.

[0005] The detection signal S3 is amplified to a required level by the receiver 4 and further demodulated and amplified as necessary.
It becomes a detection signal S4, frequency-analyzed by a frequency analysis circuit 5 to become sound pattern data S5, and a branching circuit 6, as shown in FIG. 9 and FIG.
And C, and are divided into frequency band A data S6a, frequency band B data S6b, and frequency band C data S6c (hereinafter, “data S
6a, S6b, S6c "). Each of the frequency band data S6a, S6b, S6c is composed of a frequency band and a level of main energy in the frequency band.

The frequency band A is the frequency band of the vibration wave due to the endless track of the tracked vehicle , the frequency band B is the frequency band of the vibration wave due to the tire of the wheeled vehicle, and the frequency band C is the frequency band A and the frequency band B. , Respectively. Note that the frequency band A is also a lower band of the frequency band of the vibration wave generated by the engine.

The vehicle type classification circuit 7 determines the relative level among the frequency band data S6a, S6b, S6c, determines the vehicle type classification of the sounding body 1 according to a predetermined standard, and outputs it as the determination data S7. Then, the image is displayed on the display device 8.

[0008]

However, in the above-mentioned prior art, the relative level between a plurality of frequency bands fluctuates in a complicated manner due to fluctuations in the engine load, double sounds, etc., based on the conditions of the running road surface and the like. , From the relative main energy levels of the data in multiple frequency bands,
In many cases, it is difficult to determine the vehicle type category of the sounding body in a unified manner, and there is a problem that the probability of the vehicle type category determination cannot be increased.

As described above, according to the present invention, the engine load fluctuation, noise, etc. based on the condition of the traveling road surface, etc.
Even when it is difficult to unify the vehicle type classification of the sounding body from the relative levels of the main energy between data in a plurality of frequency bands, an excellent tracked vehicle that can obtain highly reliable determination results It is an object of the present invention to provide an apparatus for extracting a vibration wave by an endless orbit .

[0010]

According to the present invention, in order to achieve the above object, a vibration wave generated from a sounding body of a vehicle passing through a specific area is detected and a characteristic of the vibration wave is analyzed. In the device that extracts the vibration wave due to the endless track of the tracked vehicle, the cylinder rate extraction circuit that extracts the instantaneous cylinder rate at the same time from the instantaneous sound pattern data, and the relationship between the cylinder rate data and the integer ratio at the same time An engine vibration data creation circuit that extracts a group of frequencies every moment, an engine vibration data removal circuit that removes engine vibration data from every moment's sound pattern data, and a tracker in the tracked vehicle 's endless track vibration frequency band data. And a vehicle type discrimination circuit for discriminating the presence or absence of the spectrum of the vibration wave due to the endless track of the vehicle.

[0011]

According to the present invention, a vibration rate generated by a sounding body of a vehicle passing through a specific area is detected, and a momentary sound pattern is detected by a cylinder rate extracting circuit in order to determine a vehicle classification of the sounding body. From the data, the instantaneous cylinder rate at the same time is extracted, an instantaneous frequency group having an integer ratio relationship with the cylinder rate data at the same time is extracted by the engine vibration data creating circuit, and the engine vibration data removing circuit extracts The engine vibration data is removed from the instantaneous sound print data, and the vehicle type classification
It is determined whether or not there is a spectrum of a vibration wave due to the endless track of the tracked vehicle in the data of the tracked vehicle 's endless track vibration frequency band at every moment.

Therefore, the relative main energy level between data in the divided frequency bands is:
Even in the case of a large disturbance due to fluctuations in engine load, noise, etc. based on the conditions of the road surface, etc., it is possible to determine the presence or absence of endless track vibration of the tracked vehicle regardless of the relative level, and obtain a highly reliable determination result. be able to.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[0014] Figure 1 is infinite instrumentation軌車showing an embodiment of the present invention
FIG. 2 is a block diagram of an orbital vibration wave extracting device, FIG. 2 is a frequency characteristic diagram of a vibration wave spectrum by a tracked vehicle, and FIG. 3 is a frequency characteristic diagram of a vibration wave spectrum by a wheeled vehicle.

As shown in FIG. 1, a vibration wave S11 generated by the sounding body 11 is detected by a sensor 12, and this sensor 1
2 is input to the transmitter 13, the output of the transmitter 13 is received by the receiver 14 via the transmission system, and the output of the receiver 14 is input to the frequency analysis circuit 15. The output of the frequency analysis circuit 15 is input to a CR extraction circuit 16. The output of the CR extraction circuit 16 is input to the engine vibration data creation circuit 17.

The engine vibration data generating circuit 1
The output of the frequency analysis circuit 15 is input to 7. The output of the engine vibration data creation circuit 17 is input to an engine vibration data removal circuit 18. The output of the engine vibration data removal circuit 18 is input to a vehicle type classification circuit 19, and the output of the vehicle type classification circuit 19 is
Connected to 0.

Here, attention is paid to the fact that the vibration wave of the endless track of the tracked vehicle and the vibration wave of the engine have different frequency bands, and the engine vibration wave is removed from the sound pattern data.
Extracting a vibration frequency band of the endless track, extracted in the vibration frequency band of the track <br/> that, by the presence or absence of spectrum of the vibration wave track, is to determine the vehicle type classification of the sounding body.

That is, the vibration wave S generated by the sounding body 11
11 is detected by the sensor 12, and the sensor 12 outputs an analog sensor output signal S12. The sensor output signal S12 is amplified to a required level by the transmitting end device 13, further modulated and amplified as necessary, and sent as a detection signal S13 to the receiving end device 14 via a transmission system.
Here, the transmission system may be either wired or wireless, and may be relayed as necessary.

The detection signal S13 is amplified to a required level by the receiver 14, and further demodulated and amplified as necessary to become a detection signal S14.
5 becomes the voice print data S15. The frequency analysis circuit 1
In 5, when a sound wave is used as the vibration wave, a high-pass filter (HPF) may cut off a frequency of about 10 Hz or less, if necessary, in order to avoid the influence of wind noise.

Until the sound pattern data S15 is obtained, there is basically no difference from the device according to the prior art.

Further, the sound pattern data S15 is input to a CR extraction circuit 16 and an engine vibration data creation circuit 17, and is also input to an engine vibration data removal circuit 18.

In the CR extraction circuit 16, as shown in FIGS. 2 and 3, first, the frequency band in which the energy of the engine vibration wave exists is divided into a plurality of frequency bands, that is, frequency bands A and D. The voice print data S15 is separated into frequency band A data and frequency band D data corresponding to each frequency band.

The frequency band A may correspond to the frequency band of the vibration wave by track, the frequency band D from the frequency band of the vibration wave by the engine, but excluding the frequency band of the vibration wave by track, vibration by the engine Corresponds to the higher side of the frequency band.

Further, in the frequency band D, for example,
The CR, which is the fundamental frequency of the vibration wave generated by the engine, is momentarily extracted with high accuracy by the autocorrelation method or another method, and is output as CR data S16. For example, FIG.
As shown in (1), the CR is extracted from the regularity of the peak value.
Since various methods for extracting the CR are known, the description is omitted here.

In the engine vibration data creating circuit 17, the instantaneous sound pattern data S applied to the sound pattern data input terminal is output.
15, a frequency that matches or is very close to the value in the same ratio as the CR data S16 at the same time is extracted, and as shown in FIG. The signal is output as S17 and input to the engine vibration data input terminal of the engine vibration data removal circuit 18.

The engine vibration data removing circuit 18 subtracts data corresponding to each frequency of the engine vibration data S17 at the same time from the instantaneous sound print data S15 in the frequency band A, as shown in a schematic spectrum in FIG. As shown in a schematic spectrum in FIG. 7, the data is output as endless track vibration frequency band data S <b> 18 of the tracked vehicle every moment and input to the vehicle type classification circuit 19.

[0027] If the sounding body 11 is a So軌車is, infinite
The track vibration frequency band data S18 mainly consists of endless track vibration waves, and in the case of a wheeled vehicle , the track vibration frequency band data S18 mainly consists of ambient noise.

In the CR extraction circuit 16, the frequency band D
In the same manner as that of extracting the CR which is the fundamental frequency of the engine vibration from the vibration wave generated by the engine in the vehicle, the vehicle type classification discriminating circuit 19 generates the endless track vibration frequency band data S18.
From is subjected to a process of extracting the fundamental frequency f _CAT infinite track vibration of So軌車, check the presence or absence of f _CAT, if f _CAT is present, i.e., if the spectrum of the endless track vibration wave is present instrumentation If there is no spectrum of the track and track vibration waves, it is discriminated as a wheeled vehicle, the discrimination result is output as discrimination data S19, and the discrimination result is displayed on the display device 20.
To be displayed.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible based on the gist of the present invention, and these are not excluded from the scope of the present invention.

[0030]

As described in detail above, according to the present invention, a CR extraction circuit for extracting a momentary CR at the same time from a momentary sound pattern data, and a CR data at the same time An engine vibration data creation circuit that extracts a momentary frequency group that has a relationship with the integer ratio, an engine vibration data removal circuit that removes the engine vibration data from the momentary sound pattern data, and an endless orbit vibration frequency band data. By providing a vehicle type discrimination circuit for discriminating the presence or absence of the spectrum of the vibration wave due to the endless trajectory, the relative level of the main energy between the data in the plurality of divided frequency bands is determined based on the state of the running road surface and the like. variation of the load, even if that increases disturbed by noise or the like, regardless of the relative level, to determine the presence or absence of track vibration, reliability It is possible to obtain a high determination result of.

[Brief description of the drawings]

FIG. 1 is a block diagram of an apparatus for extracting a vibration wave from an endless track of a tracked vehicle according to an embodiment of the present invention.

FIG. 2 is a frequency characteristic diagram of a vibration wave spectrum by a tracked vehicle.

FIG. 3 is a frequency characteristic diagram of a vibration wave spectrum by a wheeled vehicle.

FIG. 4 is a diagram showing voiceprint data at a certain time for CR extraction of a wheeled vehicle.

FIG. 5 is a diagram showing extracted CR data of a wheeled vehicle.

FIG. 6 is a diagram showing an instantaneous schematic spectrum in a frequency band A.

FIG. 7 is a diagram illustrating a schematic spectrum in which an engine sound in a frequency band A is subtracted.

FIG. 8 is a block diagram of a conventional intrusion vehicle detection device.

FIG. 9 is a frequency characteristic diagram of a vibration wave spectrum by a tracked vehicle.

FIG. 10 is a frequency characteristic diagram of a vibration wave spectrum by a wheeled vehicle.

[Explanation of symbols]

Reference Signs List 11 sounding body 12 sensor 13 sending end machine 14 receiving end machine 15 frequency analysis circuit 16 CR extraction circuit 17 engine vibration data creation circuit 18 engine vibration data removal circuit 19 vehicle type classification circuit 20 display device S11 vibration wave S12 sensor output signal S13, S14 Detection signal S15 Sound pattern data S16 CR data S17 Engine vibration data S18 Endless track vibration frequency band data of tracked vehicle S19 Discrimination data

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Suzuki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) G01H 3 / 08 G01H 17/00

Claims (1)

(57) [Claims] 1. A device for detecting a vibration wave generated from a sounding body of a vehicle passing in a specific area and analyzing a characteristic of the vibration wave to extract a vibration wave due to an endless track of a tracked vehicle. a) a cylinder rate extraction circuit for extracting the instantaneous cylinder rate at the same time from the instantaneous sound print data; and (b) an engine for extracting the instantaneous frequency group having an integer ratio relationship with the cylinder rate data at the same time. and vibration data creation circuit, (c) and engine vibration data removing circuit for removing the engine vibration data from the voiceprint data every moment, (d) track of So軌車during track vibration frequency band data So軌車vibration of the extractor by endless track So軌車characterized by comprising a vehicle type classification determination circuit for determining the presence or absence of a spectrum of the vibration wave by.