JP2680712B2 - Vibration control device malfunction detection method - Google Patents

Description

The present invention relates to a vibration damping device malfunction detection method for detecting malfunction of a vibration damping device used for a structure or the like.

[Conventional technology]

In order to detect a malfunction of the vibration damping device, conventionally, if the control circuits are provided in parallel in two series or three series, and one of them issues a command different from the other series, is it judged as a failure of that series? Or, a method such as adopting a directive by majority decision is adopted.

[Problems to be solved by the invention]

However, these methods are uneconomical because they are costly. The present invention has been proposed in view of such circumstances, and provides an economical vibration damping device malfunction detection method that is inexpensive and can be temporarily implemented only during inspection without being permanently installed in some cases. The purpose is to provide.

[Means for solving the problem]

To this end, the present invention provides an occasional correlation between a function representing an occasional vibration of the vibration-damped structure and a function representing a temporal variation of the driving force with respect to the occasional vibration of the vibration-damped structure by the vibration damping device. The function is obtained, and the value of the occasional correlation function when the time lag S of the occasional correlation function is S = 0 and the correlation function when the vibration damping device is normally operating are used as a reference correlation function and the above A difference from the value of the reference correlation function when the reference correlation function time lag S is S = 0, and the magnitude of the time lag S when the above-mentioned occasional correlation function has a minimum value;
Time lag S when the correlation function of the above reference has a minimum value
It is characterized in that the magnitude of the value of at least one of the differences from the magnitude is detected to detect the occurrence of a malfunction of the vibration damping device.

[Action]

According to such a configuration, it is determined whether the motion of the vibration damping device is moving so as to suppress the vibration of the target structure or the target structure is vibrated due to a computer failure or the like. I understand.

〔Example〕

An embodiment in which the present invention is applied to the damping of the fetching vibration due to the wind speed fluctuation of a building will be described with reference to the drawings.
Figure 1 shows the correlation function Rx between building acceleration and motor torque.
FIG. 2 is a diagram showing a normal function of y, FIG. 2 is a diagram when the performance of the vibration damping device is slightly degraded, and FIG. 3 is a diagram when the vibration damping device operates abnormally.

Here, the correlation function Rxy is Rxy (τ) = (1 / T) ∫ _{-T / 2} ^{-T / 2} X (t) · Y (t + τ)
dt is the acceleration X of the building as a structure to be damped
(T), which is obtained by the motor torque Y (t) as a driving force for the vibration of the structure to be damped by the vibration damping device at any time. First, when the vibration damping device is normal as shown in FIG. The maximum response value of the acceleration of, for example, was 17.0 gal when vibration was not damped, but decreased to 7.2 gal.

However, when the performance of the vibration damping device is slightly degraded as shown in FIG. 2, the minimum value of the building acceleration is, for example, 1
It is 1.1 gal.

If the vibration control device malfunctions and acts as an exciter on the contrary, the maximum value of the building acceleration becomes, for example, 19.1 gal, which is higher than 17.0 gal when the vibration control is not performed.

Looking at the correlation Rxy at the time lag (S) = 0, Rxy≈−0.75 in FIG. 1, Rxy≈−0.15 in FIG. 2, Rxy≈0.5 in FIG. 3, and the correlation of S = 0 when the correlation is normal. If it increases to the + side of the correlation, it can be determined that the state of the device has become abnormal.

Looking at the value of the time lag (S) at which the correlation Rxy has a minimum value, S≈0.0 in FIG. 1 and S≈− in FIG.
1.0 sec, S≈−3.5 sec in FIG. 3, and in this example, when S = −1.5 to −2.0 sec or less, it can be determined that an abnormality has occurred in the device.

The only equipment required to implement the above method is a pickup that detects building vibrations, a motor torque meter, and an analyzer.Therefore, these equipments do not need to be installed permanently, and should be set only during inspection. It is also possible to perform an inspection by using one set even if there are a plurality of vibration damping devices.

Further, the method of the present invention is highly independent since it is an inspection method completely independent of the control circuit.

〔The invention's effect〕

In short, according to the present invention, a function that represents the vibration of the vibration-damped structure at any time and a function that represents the temporal variation of the driving force with respect to the vibration of the vibration-damped structure by the vibration damping device at any time The correlation function is obtained, and the correlation function when the vibration damping device is normally operating is used as a reference correlation function, and the correlation function value at the same time when the time lag S of the correlation function at any time is S = 0 and A difference from the value of the correlation function of the same reference when the time lag S = 0 of the reference correlation function, and the magnitude of the time lag S when the correlation function of the above occasion has a minimum value;
Time lag S when the correlation function of the above reference has a minimum value
Since the occurrence of malfunction of the vibration damping device is detected by detecting the magnitude of the difference value of at least one of the differences with the magnitude of the difference, for example, the wind speed that constantly fluctuates irregularly, etc. The phase relationship between the occasional vibration of the controlled structure that vibrates and does not become a steady vibration and the temporal change of the driving force with respect to the occasional vibration of the controlled structure by the vibration control device The function that represents the vibration of the object at any time and the function that represents the temporal variation of the driving force with respect to the vibration at any time of the vibration-damped structure by the vibration damping device are monitored by the correlation function at any time. Focusing on the ever-changing time lag, it will detect the occurrence of malfunction of the vibration damping device,
When the malfunction of the vibration damping device is detected, it is possible to detect the malfunction of the vibration damping device within a short time by allowing some flexibility in determining whether or not the malfunction of the vibration damping device has occurred. In addition, it is possible to detect a malfunction of the vibration damping device by using the vibration damping device malfunction detection means that has a simple structure and can be manufactured at low cost without using a large-scale device. Even if it is not installed permanently, it can be temporarily installed and used only at the time of inspection.

[Brief description of the drawings]

FIG. 1 is a diagram showing a normal relationship between a building acceleration and a motor torque in an embodiment in which the present invention is applied to the damping of the fetching vibration due to the wind speed fluctuation of the building, and FIG. 2 is the performance of the damping device. Is a diagram when the vibration is slightly decreased, and FIG. 3 is a diagram when the vibration damping device operates abnormally.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Manabu Fujishiro 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Jun Hirai 4-chome, Kannon Shinmachi, Nishi-ku, Hiroshima Prefecture 6-22 No. 22 Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. (56) Reference JP-A-2-221725 (JP, A)

Claims (1)

(57) [Claims] 1. A function that represents vibration of a structure to be damped at any time,
Obtain a correlation function at any time with a function that represents the temporal variation of the driving force with respect to the occasional vibration of the vibration-damped structure by the vibration damping device, and obtain the correlation function when the vibration damping device is operating normally. As the reference correlation function, the value of the correlation function at any time when the time lag S of the above correlation function is S = 0 and the correlation function of the same reference when the time lag S of the above correlation function is S = 0 At least one of the difference between the value and the magnitude of the time lag S when the correlation function at any time has a minimum value and the magnitude of the time lag S when the reference correlation function has a minimum value. A method for detecting malfunction of a vibration damping device, comprising detecting the occurrence of malfunction of the vibration damping device by detecting the magnitude of the value.