JPH01206271A - Trouble detector - Google Patents

Abstract

PURPOSE:To know the abnormal vibration of an antenna device, by a method wherein a vibration detection signal is separated with respect to a plurality of frequency bands in a frequency separation part and each of the separated signals is compared with the threshold value set at every frequency band. CONSTITUTION:When an antenna is rotated, vibration is generated in an antenna apparatus 1. This vibration is detected by a vibration detection part 2 and converted to a vibration signal to be outputted to an amplifying part 4. The amplifying part 4 outputs an amplified vibration signal 5 to a frequency separation part 6. The signal 5 is separated at every component of each frequency band by each filter in the frequency separation part 6 to be outputted to a comparator part 8 as a filter output signal 7. When abnormal vibration is generated in the antenna apparatus 1, the level of either one of the output signals 7 of the filters A-I of the frequency separation part 6 becomes high by said abnormal vibration and exceeds each of the threshold values SHa-SHi of the comparators corresponding to the respective filters. By this method, a high level comparator output signal 9 is outputted and an alarm generation part 10 outputs alarm output 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a failure detection device, and particularly to a failure detection device suitable for detecting a failure in an antenna device of a radar device.

[Prior Art] A radar device measures the direction and distance of a target by receiving reflected waves of emitted radio waves. The antenna of a radar device has sharp directional characteristics, and by pointing the antenna in a direction to be measured, it is possible to measure the distance to a target in that direction.

Therefore, the antenna is driven by an appropriate drive unit and constantly rotates or reciprocates.

Conventionally, failures in an antenna apparatus having a rotating or reciprocating antenna have been detected by an inspector using his or her five senses to detect abnormal vibrations in the tuning fork.

[Problem to be solved by the invention] However, in detecting a malfunction in the above-mentioned antenna device, judgment is made using the human five senses, so there are individual differences, and the tuning fork does not grasp the absolute value of vibration, etc. Therefore, there is a problem in that it is difficult to distinguish between failures and to discover failures early.

The present invention has been made in view of the above problems, and by detecting abnormal vibrations of the antenna device, it is possible to determine the occurrence of a malfunction in the antenna device, and to discover the malfunction at an early stage. The purpose of the present invention is to provide a failure detection device that can perform the following steps.

[Means for Solving the Problems] A failure detection device according to the present invention includes a vibration detection section that is placed in a detected device and detects its vibration, and a detection signal of this vibration detection section that is separated into a plurality of frequency bands. A frequency separation section, a comparator section that sets a threshold for each frequency separated component and compares it with each specified value, and an alarm generation section that outputs an alarm signal based on the output of this comparator section. It is characterized by having the following.

[Operation] In the present invention, vibrations of a detected device such as an antenna device are detected by a vibration detection section, and this detection signal is separated into a plurality of frequency bands by a frequency separation section. Then, the components of each frequency band are compared with the specified value by the threshold set in the comparator section, and the alarm generation section sets the vibration detection signal of one of the frequency bands, respectively, based on the output of the comparator section. Outputs an alarm signal if the value exceeds the specified value.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a failure detection device according to an embodiment of the present invention. The antenna device 1 is mounted on a suitable fixed stand (
(not shown), and its antenna (not shown) is rotationally driven by an appropriate drive unit. A vibration detection unit 2 provided in the antenna device 1 detects vibrations of the antenna device 1, converts the vibrations into an electric signal, and outputs a vibration signal 3 to the amplification unit 4. The amplification section 4 amplifies this vibration signal 3 and outputs an amplified vibration signal 5 to the frequency separation section 6 .

The frequency separation unit 6 has a plurality of filters A to I (not shown in FIG. 1), and the filters A to I separate the amplified vibration signal 5 into each frequency band, and output the filter output signal 7 as a filter output signal 7. It is output to the comparator section 8. FIG. 2 is a graph diagram showing an example of the amplified vibration signal 5 and characteristics of filters A to I. As shown in FIG. 2, each filter output signal 7 is obtained by separating the amplified vibration signal 5 into each frequency band.

The comparator section 8 has a plurality of comparators (not shown) corresponding to each of the filters A to I, and the filter output signals 7 of the corresponding filters A to (2) are input to the comparators, respectively. FIGS. 3(b) to 3(j) are graphs showing the outputs of filters A to (2) and the thresholds SH to SHI of each comparator. Further, FIG. 3(a) shows the amplitude of the amplified vibration signal 5. Each threshold SH, to SH, is set to a value larger than the amplitude of each filter output signal 7 when the antenna device 1 is normal. , when abnormal vibration occurs in the antenna device 1, an output signal 7 in a specific frequency band is generated depending on the type of abnormality.
becomes large and exceeds the threshold SH or SHI determined for that frequency band, the comparator outputs a comparator output signal 9. That is, when the output signals 7 of the filters A to A are larger than the thresholds SH and SHI, the comparators output, for example, a high level comparator output signal 9, and when they are smaller, the comparator outputs a low level. Outputs signal 9.

Each comparator output signal 9 of the comparator section 8 is input to an alarm generation section 10, and the alarm generation section 10 calculates the sum of each comparator output signal 9, and determines whether a high-level output signal 9 is input from one of the comparators. In this case, the alarm output 11 is output to the alarm output terminal 12.

Next, the operation of the failure detection device configured as described above will be explained with reference to FIGS. 2 and 3.

Now, when the antenna is rotated, vibrations are generated in the antenna device 1 accordingly. This vibration is detected by the vibration detection section 2, converted into a vibration signal 3, and outputted to the amplification section 4. The amplifying section 4 amplifies this vibration signal 3 to generate an amplified vibration signal 5.
is output to the frequency separator 6.

When the amplified vibration signal 5 is input to the frequency separator 6, the second
As shown in the figure, the components of each frequency band are separated by each filter, and the filter output signal 7 is output to a comparator section 8.
is output to. In the example shown in FIG. 2, the amplified vibration signal 5 has the largest amplitude in the frequency band passed by the filter C1D, and the next largest amplitude in the frequency band passed by the filters F and G.

By comparing the output levels of the filters C and D with each other in FIG. It can be seen that this is caused by vibrations in a normal state.

The output levels of the filters A to (2) are all lower than the thresholds SH, to SH of the comparator section 8, and each comparator outputs a low level comparator output signal 9. Therefore, in this case,
The alarm output 11 from the alarm generator 10 is never output to the alarm output terminal 12.

Now, when abnormal vibration occurs in the antenna device 1, the level of any of the output signals 7 of the filters A to I of the frequency separation section 6 becomes high due to this abnormal vibration, and the thresholds SHa to SH of the comparators corresponding to each filter increase.
, exceeds. As a result, a high-level comparator output signal 9 is output from the comparator whose filter output signal 7 exceeds the threshold SH or SHI, and the alarm generator 10 outputs the alarm output 11 to the alarm output terminal 12.
Output.

In this way, the antenna device 1 Since abnormal vibrations of the antenna device 1 can be detected, it is possible to determine a failure of the antenna device 1 and to discover the failure early.

Effects of the Invention As described above, according to the present invention, the vibration detection section detects vibration of the detected device, the frequency separation section separates this vibration detection signal into a plurality of frequency bands, and the comparator section separates the vibration detection signal into multiple frequency bands. By comparing the vibration detection signal component of each frequency band with the threshold set for each frequency band, it is possible to detect abnormal vibrations of the antenna device from the output of this comparator section, which can indicate the occurrence of a malfunction of the antenna device. can be precisely judged without relying on the five human senses, and
Failures can be detected early.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing a failure detection device according to an embodiment of the present invention, Figure 2 is a graph diagram showing filter characteristics of the frequency separation section, and Figures 3 (a) to (j) are filter output signals and thresholds. It is a graph diagram showing the relationship with hold.

Claims (1)

[Claims] (1) A vibration detection unit that is placed in the detected device and detects its vibration, a frequency separation unit that separates the detection signal of this vibration detection unit into multiple frequency bands, and components of each frequency band separated by frequency. What is claimed is: 1. A failure detection device comprising: a comparator section that sets a threshold for and compares it with each specified value; and an alarm generation section that outputs an alarm signal based on the output of the comparator section.