JPH0867352A - Transportation method - Google Patents

Abstract

(57) [Summary] [Object] The present invention reliably grasps vibrations, which are typified by nuclear fuels, that may be applied to dangerous substances in a transportation container that humans cannot enter by a vibration sensor installed outside the container. And contribute to its safe transportation. In a transportation method for measuring the vibration applied to a transportation object housed in a container during transportation, a vibration sensor S1 is provided, in which vibration applied to a simulated transportation object 1'is installed at a point P1 inside the container and a point P2 outside the container. , S2, a simulated transportation test is performed in advance, and a vibration transfer function between the P1 point and the P2 point is obtained from the comparison of the simulated transportation vibration data at the P1 point and the P2 point obtained by the simulated transportation test.
In actual transportation, vibration sensor S installed at point P2 above
A transportation method in which the vibrations are measured by S1 and S2 and the vibration applied to the object to be transported is estimated from the vibration transfer function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transportation method for appropriately measuring vibration applied to a transportation object when the transportation object accommodated in a container is transported by transportation means such as a vehicle, a ship and an aircraft. The present invention relates to a transportation method suitable for grasping vibration data during transportation of nuclear fuel, for example.

[0002]

2. Description of the Related Art Conventionally, in transporting dangerous substances such as nuclear fuel, they are housed in a closed container made of a specific metal,
Transportation is carried out in a state of being cut off from the outside world. At this time, vibration applied to the object to be transported (nuclear fuel) is installed on the outside of the closed container with a vibration sensor, and the transportation vibration data output from this vibration sensor is transferred to a tape recorder or the like. It was recorded by a recording device and placed, and after transportation, the recorded transportation vibration data was observed with an oscilloscope or taken out on a recording paper to analyze all the information in detail.

In addition to the nuclear fuel, it is necessary to measure outside the container for a transportation object in which a vibration sensor is difficult to install inside the container.

[0004]

However, in the above method, since the elastic absorbing material for protecting the container or the object to be transported is interposed, the vibration data actually applied to the object to be transported in the container cannot be accurately grasped. In particular, when vibration that causes resonance of the object to be transported is applied, the external vibration is greatly amplified and added to the object to be transported, causing damage. It is impossible to accurately grasp the vibration caused by the above, that is, the vibration due to the resonance applied to the object to be transported, and it is not possible to take effective post-measures.

Further, the tape recorder has a limit in recording,
Unattended recording was difficult because the tapes had to be changed regularly during long-term transportation.

Further, since all unnecessary vibration data during transportation is recorded, not only the data becomes enormous, but also the subsequent data analysis leads to a long analysis work and an increase in cost, resulting in a lack of reliability. Had.

[0007]

SUMMARY OF THE INVENTION The present invention is a transportation method capable of accurately grasping vibration applied to an object to be transported contained in a container outside the container. A simulated transportation test is carried out in advance by a vibration sensor installed at the point P1 and a point P2 outside the container. From the comparison of the simulated transportation vibration data at the point P1 and the point P2 obtained by this simulated transportation test, a point P1 is obtained. Provided is a transportation method in which a vibration transfer function between P2 points is obtained, vibration is measured by a vibration sensor installed at the P2 point in actual transportation, and vibration applied to a transportation object is estimated from the vibration transfer function.

The present invention also provides a transportation method in which transportation vibration data of the vibration sensor at the point P2 is selected and stored as a threshold value and is input to a vibration storage device which can be output to a data analysis personal computer.

[0009]

According to the present invention, the vibrating element such as the magnitude and frequency of the vibration applied to the object to be transported in the container is installed outside the container based on the previously known vibration transfer function inside and outside the container. Can be accurately estimated from the output of the vibration sensor,
This can be effectively reflected in the packaging system for actual transportation.

In particular, even when an increased vibration is applied to the object to be transported in the container due to the resonance phenomenon, the resonance phenomenon in the container, which has been difficult in the past, is known from the knowledge of the vibration transfer function that causes the resonance. It became easy to understand from the analysis of external vibration.

Further, by using the vibration storage device, only necessary transportation vibration data can be collected and efficiently stored, and tape replacement or the like is not required even during long-time transportation, so that labor saving and measurement cost reduction can be achieved. In addition, after transportation, the vibration storage device that holds the vibration data selected and stored at this threshold value can be carried to a remote location, and data analysis by a personal computer can be performed easily, quickly and efficiently, and labor saving of analysis work Not only can low cost be achieved, but the reliability of analysis results can be improved.

[0012]

EXAMPLE As shown in FIG. 1, nuclear fuel (transportation object) 1
Is hermetically housed in an inner container 2 formed of a shielding metal, supported in the same container 2 by an arbitrary vibration absorbing member 3, and while further accommodating the inner container 2 in an outer container 4, the vibration absorbing member It is supported in the outer container via 5 and is transported by vehicle. This vehicle 6 can be replaced by a ship or an aircraft.

As shown in FIG. 2, as a learning before the actual transportation, the vibration sensor S1 is installed in the container, and the vibration sensor S2 is installed outside the container, and the simulated transportation object 1'is housed in the container. Conduct one or more simulated transportation tests.

The vibration sensor S in the simulated transportation test
The installation location of 1 is P1 point, and the installation location of the same sensor S2 is P
2 points.

In the present invention, when the vibration sensor S1 is arranged in the inner container 2 and the point P1 is set, the vibration sensor S2 is installed inside or outside the outer container 4 and is set as P1.
Including the case of 2 points.

Further, a vibration sensor S1 is arranged in the outer container 4,
When this is set to the point P1, it includes the case where the vibration sensor S2 is installed outside the outer container 4 and is set to the point P2.

When a dangerous material such as a nuclear fuel is planned as a transportation object, the vibration sensor S1 is arranged in a container in which human beings cannot enter, and the vibration sensor S2 is arranged outside the container.
To arrange for simulated transportation.

Preferably, the vibration sensor S1 is installed directly at a position where the vibration applied to the simulated transport object 1'can be detected most faithfully, for example, the transport object itself or its package.

The present invention can be applied not only to the nuclear fuel described above but also to all objects to be transported such as other dangerous substances contained in a closed container, or to objects to be transported contained in a semi-enclosed container. Conduct a simulated transportation test according to the transportation object of.

The transportation vibration data detected by the respective vibration sensors S1 and S2 installed at the points P1 and P2 in the above-mentioned simulated transportation are stored in the vibration storage device M installed at an appropriate place of the transportation means.

This vibration memory device includes each vibration sensor S1,
Either every S2 or shared. Each vibration sensor S
1, S2 and the vibration storage device M are connected by a cable 7 via a connector 8 attached to the case of the same device, or have built-in storage device vibration sensors S1, S2. Alternatively, the vibration sensors S1 and S2 are directly attached to the outer surface of the case of the storage device M via a connector.

As the vibration sensors S1 and S2, a known piezoelectric sensor, for example, is used, and vibration in each of the X, Y and Z directions can be detected.

The storage device M comprises a storage operation unit A and a threshold value setting unit B, and the transportation vibration data detected by the vibration sensors S1 and S2 are fetched into the storage operation unit A via the amplification unit C, The above data, which changes over time during transportation, is stored and accumulated.

The threshold value setting unit B sets a threshold value of the vibration data to be stored in the storage / calculation unit A, and selects and stores waveform data having a peak point equal to or higher than the threshold value.

The memory computing unit A and the threshold value setting unit B are CP
Operates on U, ROM and RAM.

The storage device M may include a timer for storing the time of occurrence of the vibration data stored in the storage / calculation unit A.

An interface D for taking out the transportation vibration data stored in the storage operation unit A to a personal computer E (personal computer) is built in the storage device M, and after the simulated transportation object 1'is transported, the vibration is carried out. Storage device M
P from the transportation means to the analysis room, and by connecting the personal computer E to the connector 9 attached to the case of the storage device M, the points P1 and P stored in the storage operation unit A
The personal computer E analyzes the transportation vibration information at two points.

As described above, in the transportation method for measuring the vibration applied to the transportation object 1'contained in the container during transportation, the vibration applied to the simulated transportation object is measured in the container P1.
Vibration sensors S1 and S2 installed at the point and P2 point outside the container
In the actual transportation, a simulated transfer test is performed in advance, and the vibration transfer function between the P1 point and the P2 point is obtained from the comparison of the simulated transport vibration data at the P1 point and the P2 point obtained by the simulated transport test. Measures the vibration by the vibration sensor S2 installed at the point P2, and estimates the vibration applied to the object to be transported from the vibration transfer function.

Vibration sensor S at the points P1 and P2
The transportation vibration data of 1 and S2 are selected by the threshold value as described above.
The data is input to the vibration storage device M which can be stored and output to the data analysis personal computer E.

In order to explain the vibration transfer function, a standing wave, a pulse wave, and a resonance wave will be described as typical examples of the vibration elements applied to the points P2 and P1 during transportation.

The standing wave is a vibration that is constantly generated at points P2 and P1 when the transportation means is operating stably in the simulated transportation test (see FIG. 5), and the pulse wave is a vehicle having road surface projections. This is a shock wave that suddenly occurs at points P2 and P1 when the vehicle crosses a ditch or a ditch, when an aircraft crashes into an air pocket, or when a ship encounters an abnormal sea wave (see FIG. 6).

The resonance wave means the vibration at the points P1 and P2, which causes the resonance at the point P1 by the vibration applied to the point P2 (see FIG. 7).

For the standing wave of FIG. 5, when the amplitude of the vibration waveform at the point P2 is h2 and the amplitude of the vibration waveform at the point P1 is h1, the value of h1 / h2 is the vibration transfer function a1. .

For example, when traveling on a flat paved road at a legal speed using a vehicle under the transportation conditions shown in FIG.
If a vibration of 2G (h2) is applied, the vibration attenuated from this, for example, 0.12G (h1) is applied to the point P1, and the vibration transfer function a1 = 0.12 / 0.2 =
It is 0.6, and by using this vibration transfer function a1, it can be estimated that the amplitude h1 at the point P1 is h1 = a1 × h2 from the amplitude h2 at the point P2.

Regarding the pulse wave of FIG. 6, when the amplitude of the vibration waveform is h4 and the amplitude of the vibration waveform at the point P1 is, the value of h3 / h4 is the vibration transfer function a2. For example, when passing through a projection or ditch on a paved road, P2
If 2.0 G (h4) vibration is applied to the point, P1
At the point, the vibration attenuated from this, for example 1.4 G (h
1) is added, the vibration transfer function at this time a2 = 1.4 /
2.0 = 0.7, and using this vibration transfer function a2, the amplitude h4 at the point P2 to the amplitude h3 at the point P1 is h3 = a2.
It can be estimated as × h4.

In the case of a pulse wave, the amplitude h4 of vibration applied to the point P2 may be inversely increased and applied to the point P1 according to the pulse response theory. This relationship is also P2 point and P1
If the vibration transfer function of the point is obtained and placed, the vibration at the point P1 in the actual transportation described later can be estimated.

Next, the resonance wave of FIG. 7 will be described.
When the vibration applied to the point P2 matches the natural frequency at the point P1, resonance is induced at the point P1 and the amplitude is greatly increased.

Similar to the above, the amplitude of the vibration waveform at point P2 is h
6, when the amplitude of the resonance vibration waveform at the point P1 is h5, the value of h5 / h6 is the vibration transfer function a3.

For example, a vibration of 0.2 G (h6) is applied to the point P2 and a resonance is generated at the point P1 to, for example, 0.6 G (h5).
Is added, the vibration transfer function a3 = 0.
6 / 0.2 = 3, and using this vibration transfer function a3, the amplitude h6 at the point P2 to the amplitude h5 at the point P1 is h5 = a3.
It can be estimated as × h6.

The vibration transfer function in the simulated transportation test is obtained by connecting the vibration storage device M used in the simulated transportation to the personal computer E as described in FIG. 4 and analyzing the transportation vibration data at the points P1 and P2.

As described above, the vibration transfer functions a1, a2, a3, etc. are obtained as learning values in advance by the simulated transportation test, and at the time of actual transportation, the same as shown in FIGS. 1 and 2 as shown in FIG. Under the transportation conditions, the actual transportation object 1 is transported, and the vibration sensor S2 is installed at the point P2 to measure the vibration. The actual transportation vibration data detected by this sensor is taken into the vibration storage device M installed in the proper place of the transportation means, and the vibration which will be applied to the point P1 in the actual transportation using the vibration transfer functions a1, a2 and a3 learned previously. To estimate. That is, the vibration storage device M used for actual transportation is brought from the transportation means to the analysis place, connected to the personal computer E as shown in FIG. 4, and the vibration analysis is performed to obtain the vibration transfer function a.
The vibration mode at the point P1 is estimated from 1, a2 and a3.

At the time of actual transportation, the threshold value setting unit B sets the threshold value to be stored in the storage / calculation unit A as in the case of the simulated transportation, and the stored transportation vibration data is stored in the data analysis personal computer E. Output and perform the analysis.

[0043]

According to the present invention, by using the vibration transfer function inside and outside the container which is known in advance by the simulated transportation test, the magnitude of the vibration, the frequency, etc. which may be applied to the object to be transported inside the container can be determined. The vibrating element can be accurately estimated from the output of the vibration sensor installed outside the container during actual transportation, and this can be effectively used for transportation specifications such as a packaging system during actual transportation.

In particular, even when the increased vibration is applied to the object to be transported in the container due to the resonance phenomenon, the resonance phenomenon in the container, which has been difficult in the past, can be removed from the container by learning the vibration transfer function that causes the resonance. It became easy to understand from the vibration.

Further, only the required transportation vibration data selected by the threshold value by the vibration storage device can be collected and effectively stored, and after the transportation, the vibration storage device can be carried to a remote place to facilitate data analysis by a personal computer. In addition to being able to perform the analysis work quickly and efficiently, it is possible to reduce the cost of the analysis work and reduce the cost, and also to significantly improve the reliability of the analysis result.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing a vehicle transportation state of dangerous substances such as nuclear fuel.

FIG. 2 is a cross-sectional view schematically showing a state where a simulated transportation test is being performed under the transportation conditions of FIG.

FIG. 3 is a cross-sectional view schematically showing a state where actual transportation is performed under the transportation conditions of FIGS. 1 and 2.

FIG. 4 is a conceptual diagram of a vibration storage device.

FIG. 5 is a waveform diagram of transportation vibration data (stationary wave) at points P2 and P1 in a simulated transportation test.

FIG. 6 is a waveform diagram of transportation vibration data (pulse waves) at points P2 and P1 in a simulated transportation test.

FIG. 7 is a waveform diagram of transportation vibration data (resonant wave) at points P2 and P1 in a simulated transportation test.

[Explanation of symbols]

 1'simulated transportation target 2 actual transportation target 3 inner container 4 outer container 6 vehicle S1, S2 vibration sensor M vibration memory device E personal computer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shuichi Yabushita 3-28-7 Nakamagome, Ota-ku, Tokyo Yamaichi Electric Co., Ltd. (72) Inventor Hozawa 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Inside the formula company Toshiba Yokohama office (72) Inventor Yoshio Kitada 8 Shinsita-cho, Isogo-ku, Yokohama-shi Kanagawa Co., Ltd. Inside the formula company Toshiba Yokohama office (72) Inventor Mina Hanada 8 Shinsugita-cho, Isogo-ku, Yokohama-shi Kanagawa Company Toshiba Yokohama Office

Claims (2)

[Claims] 1. A transportation method for measuring vibration applied to a transportation object housed in a container during transportation, wherein vibration applied to a simulated transportation object is set by a vibration sensor installed at a point P1 inside the container and a point P2 outside the container. A simulated transportation test for preliminary measurement was performed, and the above-mentioned P1 obtained by this simulated transportation test
P1 from the comparison of simulated transportation vibration data at point P2
A vibration transfer function between a point P2 and a point P2 is obtained, and in actual transportation, vibration is measured by a vibration sensor installed at the point P2, and the vibration applied to the object to be transported is estimated from the vibration transfer function. Law. 2. The transportation method according to claim 1, wherein the transportation vibration data of the vibration sensor at the point P2 is selected and stored as a threshold value and input to a vibration storage device capable of being output to a data analysis personal computer. .