JP2519256B2 - Fender displacement measuring method and device using berthing speedometer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fender displacement measuring method and a fender displacement measuring method using a berth speedometer for measuring a distance from a berth position and a moving speed when a ship or the like berths, for example. Regarding the device.

[Prior Art] Generally, the berthing position for berthing a ship is as shown in FIG. That is, the docking position of the ship 1 in the stern direction at the docking position 2 is referred to as the docking normal line 6, and as the docking position 2, a pier, a quay, a berth, a dolphin, etc. are usually used, and the impact of the ship 1 at the docking A fender (fender) 3 which is generally made of an elastic material such as synthetic rubber is provided in order to relax and prevent the destruction of various equipment near the berthing position 2.

Usually, in order to dock a ship at such a docking position,
There is a strong demand for safety as well as speeding up the work for connecting vessels. For large tankers and large carriers that carry flammable substances such as heavy oil, LPG, and LNG, safety is especially required because a slight misjudgment when berthing can lead to a serious accident. Incorrect estimation of the speed of the ship to berth or the distance to the quay will cause the ship to collide with the quay, for example, the impact may cause distortion of the hull,
The cargo may be damaged, and in extreme cases, the risk of ignition of flammable gas or heavy oil may increase, possibly resulting in a serious accident.

In order to prevent such an accident, a very expensive fender 3 is installed at the berth position 2 as shown in FIGS. 5 and 6 at the joint position of the bow and stern to absorb the impact of the collision. are doing. In addition, an ultrasonic berth speed meter is provided at the berth position 2 as an effective means for informing the ship of the speed of the berth to be berthed and the distance to the berth in order to accurately maneuver the berth. Has been.

The ultrasonic berthing speedometer is usually docked at the same position on the pier of the base when a large ship as mentioned above is docked, and as shown in FIG. 5 and FIG. Transducers 5-1 and 5-2 of the berth speedometer are installed at the two connecting positions of the bow and stern of the ship 1, respectively, and the distance of the ship approaching the berth position 2 from a distance of 100m or 200m. The moving speed is measured, and the measurement result is
A large display (not shown), such as an electronic bulletin board, formed so as to be visible even when the ship is at a distance.
Is installed on the quay at docking position 2.

In this conventional berth speed meter, the measuring instrument body 4 is set at the berth position 2
Installed in the transmitter / receiver for transmitting and receiving ultrasonic waves 5-
1 and 5-2 are installed in seawater, and from the berth position 2 the ship 1
The ultrasonic wave is transmitted and received in the horizontal direction.

The conventional ultrasonic berthing speed meter configured as above is
For example, it works as follows.

First, the electric signal generated from the measuring instrument main body 4 is supplied via a signal line to the transducers 5-1 and 5-2 installed in seawater at the berth 2 of the bow and stern to generate ultrasonic signals. An ultrasonic signal having a narrow beam width is emitted from the transducers 5-1 and 5-2 after being converted into seawater toward the measurement target ship. A part of this ultrasonic beam hits the hull of the ship 1 and is reflected. The reflected wave from the ship 1 is transmitted / received by a transmitter / receiver 5-
It returns to 1, 5-2, is converted into an electric signal again, and is transmitted to the measuring instrument main body 4. Since the time from the emission of the ultrasonic signal from the transducers 5-1 and 5-2 to the arrival of the reflected signal is proportional to the distance between the transducers 5-1 and 5-2 and the ship 1, By measuring the time, the distance between the berthing position 2 and the bow and stern of the ship 1 can be measured. Further, by knowing the change in the distance within the unit time, the moving speed of the ship 1 with respect to the berth position 2 can be known. These measurement results are displayed by numbers on a large display (not shown) provided on the quay.

A pilot or the like can see the display and steer the boat 1 so that the bow and stern of the boat 1 move in a posture parallel to the berthing position 2 and at a predetermined speed.

[Problems to be Solved by the Invention] However, even if the ship is maneuvered by knowing the distance between the ship and the berth position and the speed of the ship with the berth speed meter, the ship should be accurately aligned with the berthing position before berthing. Is often difficult due to the inertia of the ship and the effects of waves, tides, and wind. Therefore, the hull of the fender 3
Can often collide with. The fender 3 serves to buffer the impact at the time of this collision, and this prevents the kinetic energy of the ship from being absorbed and the hull from colliding with the quay.

By the way, when an impact is applied to the fender 3, distortion due to stress is generated inside the fender 3. This strain remains on the fender 3 when a shock is frequently applied, causing fatigue in the material forming the fender 3 and leading to destruction when a shock is applied later. In addition, even if the number of times stress is applied is abnormally large strain occurs at one time, this also causes residual strain, material fatigue, etc. when a shock is applied at a later point in the same manner as described above. , Will be destroyed. Moreover, when the fender 3 is destroyed, the shock of the ship cannot be buffered, and the risk of the ship colliding with the quay increases. Also, the impact may cause distortion in the hull,
It may damage the cargo and, in extreme cases, increases the risk of ignition of flammable gases and fuel oil.

Further, even after the ship is connected, the ship may oscillate due to the influence of waves, tides, wind, etc., and the collision with the fender 3 may be repeated frequently. Distortion is also generated in the fender 3 due to this collision, and in addition to the case of the collision at the time of the above-mentioned boat operation, this distortion is also accumulated, and the risk of destroying the fender 3 becomes higher.

In order to prevent the above danger, it is necessary to replace the fender 3 before the fender 3 is destroyed. For that purpose, it is necessary to detect a state where strain is accumulated in the fender 3. The strain of the fender 3 can be detected by detecting the history of the amount of displacement of the tip of the fender 3 due to compression, bending, etc. of the fender 3. That is, by recording the displacement amount of the fender 3, the amount of strain remaining inside can be known to some extent.

Also, if a fender destruction accident occurs,
It is believed that the magnitude of the stress applied to the fender at the time of the accident and the past state can be known, which is also useful for investigating the cause of the accident.

However, providing a special device for this purpose requires a large amount of investment, and thus has not been realized in the past.

An object of the present invention is to provide a fender displacement measuring method that can easily detect a displacement amount of a fender without using a special device by utilizing measurement data of a berth speedometer. Another object of the present invention is to provide a device therefor.

[Means for Solving Problems] The first invention of the present application is, as means for solving the above problems,
The ultrasonic wave is transmitted by the wave transmitter / receiver installed at the berth of the ship, the reflected wave from the ship is received 0, and the distance from the wave transmitter / receiver to the ship is determined by the time required for the ultrasonic wave to return. ,
When measuring the moving speed of the ship, the reference position is set to a constant distance from the transducer, and the distance from the transducer to the ship, and the distance from the transceiver to the reference position, The standardized distance from the reference position to the ship is calculated, and when the ship reaches the reference position or a preset proximity position in the vicinity thereof, the calculated standardized distance is output as displacement information of the ship. The feature is that the displacement amount of the fender tip is obtained from the displacement information.

Further, the second invention of the present application is, as an apparatus for measuring the amount of displacement of the fender, a transducer installed at a berth position of a ship for transmitting and receiving ultrasonic waves, and an ultrasonic transducer Send a sound wave,
An ultrasonic berthing speed including a measuring instrument main body that receives a reflected wave from a ship and measures the distance from the transmitter / receiver to the ship and the moving speed of the ship according to the round trip time of the ultrasonic wave. The reference position is set to a fixed distance from the transducer, and the distance from the transducer to the vessel and the distance from the transducer to the reference position, the standard from the reference position to the vessel. Standardized distance calculating means for calculating the standardized distance, determining means for determining whether or not the vessel reaches the reference position or a preset vicinity thereof, and the reference position by the determining means or the preset vicinity thereof When it is determined that the ship has reached the area of
Displacement information output means for outputting the calculated normalized distance as displacement information of the ship is provided, and the displacement amount of the fender tip is detected from the displacement information.

In the present invention described above, preferably, the reference position,
It is set so as to coincide with the docking normal, and the reference position is set so as to coincide with the fender tip position.

Further, in the above-described present invention, preferably, when the distance from the transducer to the ship is smaller than the distance from the transducer to the reference position, the displacement information is the displacement amount of the fender tip, Measure the fender displacement.

However, the reference position is set to a position inside the tip of the fender, that is, a position between the tip and the base end of the fender, and a position from the reference position to the tip of the fender is set in advance as a near area. It can also be set. Further, it is also possible to set the position to the outside of the tip of the fender, that is, the position away from the tip of the fender.

The fender displacement can be measured by displaying the displacement information as the displacement amount of the tip of the fender or by recording it with a recording device such as a printer.

Further, it is also possible to set a limit value of the displacement amount set at the time of designing in advance, judge whether the obtained displacement information has reached this limit value, and issue an alarm. Further, an alarm may be issued when the cumulative value of the displacement amount reaches a preset warning value.

[Operation] In the measurement of the displacement amount of the fender, which is the object of the present invention, the displacement amount of the fender is measured by measuring the displacement of the ship, focusing on the fact that the displacement of the fender is caused by the pressure of the hull of the ship. ing. Therefore, the present invention utilizes the measurement data of the berth speedometer.

That is, in the present invention, a reference position is set at a constant distance from the transducer, the distance from the transducer to the ship is standardized to the distance from the reference position, and the standard position is determined by the standardized distance. Represents the displacement of the ship, and the displacement amount of the fender tip is obtained based on this displacement information. This standardized distance is the distance from the transducer to the ship,
It is calculated from the distance from the transmitter / receiver to the reference position, but is generally obtained by subtracting the latter from the former. In this case, if the ship is offshore from the reference position, the sign of the normalized distance is positive, and if the ship is on the land side of the reference position, the sign of the normalized distance is negative.

It suffices that the detection of the displacement amount of the tip of the fender starts when the ship reaches the reference position or a preset near position near the reference position, and outputs the calculated normalized distance as displacement information. In this case, the reference position is, as described above,
Although it can be set at various positions, it is generally set at the fender tip position. Whether or not the ship has reached the reference position can be determined by setting the normalized distance from positive to zero.

When the tip end position is set, when the normalized distance becomes negative from 0, the negative value directly represents the displacement amount of the fender. Therefore, in this case, the change in the displacement amount of the fender is recorded by recording the normalized distance.

When the reference position is set to a position inside the tip of the fender, and when the position from the reference position to the tip of the fender is preset as a near area, the elastic limit determined by the design of the fender is considered. Then, by setting the maximum displaceable range within the elastic limit of the fender tip to the reference position, it is possible to measure the displacement amount of the fender, excluding the displacement within the range in which the strain is hardly left in the fender.

When the reference position is set outside the tip of the fender, the motion of the hull before the collision with the fender can be recorded as the displacement information. Also, with this displacement information,
If necessary, it is possible to detect changes in the momentum and kinetic energy of the hull before and after the collision, and more detailed information can be obtained regarding damage to the fender.

As described above, according to the present invention, it is possible to easily detect the displacement amount of the fender by using the measurement data of the berth speedometer without providing a special device.

[Embodiment] Next, an embodiment of a fender displacement measuring method and device using a berthing speed meter according to the present invention will be described.

<Structure of Embodiment> First, the arrangement of the ultrasonic shore speedometer used in this embodiment will be described with reference to FIGS. 2A and 2B.

At the berthing position 2 where the ultrasonic berthing speed meter used in this embodiment is arranged, a fender (fender) made of an elastic material such as synthetic rubber is almost the same as that shown in FIG. 3 is provided. The ultrasonic berthing speed meter is provided in the seawater below the berthing position 2 corresponding to the two joining positions of the bow and the stern of the ship 1 berthing.
2 are installed, and the measuring instrument main body 4 is installed at an appropriate position at the berthing position 2.

As shown in FIG. 1, the apparatus for carrying out the fender displacement measuring method of the present embodiment includes a berth speedometer composed of a wave transmitter / receiver 5 and a measuring device main body 4, and a normalized distance calculating means 30,
It is configured to include a determination unit 40 and a displacement information output unit 50. In the present embodiment, the normalized distance calculation means 30, the determination means 40, and the displacement information output means 50 are configured by the microcomputer 14 as described later.

The standardized distance calculating means 30 includes the transceivers 5-1 and 5-
The reference position 7 is set at a constant distance from 2, and the transducer 5
-1, from the distance L from the 5-2 to the ship 1 and the distance A from the transducers 5-1 and 5-2 to the reference position 7,
A standardized distance D from the reference position 7 to the ship 1 is calculated. The calculation is performed by the following formula.

D = L-A In the present embodiment, the reference position 7 is set so as to coincide with the docking normal line 6. As a result, in this embodiment,
The reference position 7 is set to coincide with the tip position of the fender 3.

The determination means 40 determines whether the ship 1 has reached the reference position 7. That is, it is determined whether D ≦ 0.
In this state, a determination signal indicating “D ≦ 0” is sent to the displacement information output means 50.

In response to this, the displacement information output means 50 outputs the calculated normalized distance D as displacement information of the ship 1.
That is, the normalized distance D in the range of D ≦ 0 is output as the displacement information. In this embodiment, as will be described later, a printer 21 is provided as output means, and the printer 21 outputs displacement information.

The measuring apparatus for carrying out the displacement measuring method of the present embodiment described above, and the measuring instrument main body 4 of the berth speedometer to which the measuring apparatus is applied are more specifically configured as shown in FIG. 3A.

In the figure, the measuring device main body 4 includes a timing generation circuit 9 that outputs a transmission timing signal of an ultrasonic pulse and a switching signal of the transducers 5-1 and 5-2, and an ultrasonic pulse that receives the transmission timing signal. Pulser circuit 10 for forming an excitation current pulse that generates a pulse wave, switch 11 for bow and stern transducers 5-1 and 5-2, and transducers 5-1 and 5-
A receiver 12 for receiving a reflected wave from a signal input from 2,
A signal processing circuit 13 that performs signal processing on the received signal to measure the round-trip time of ultrasonic waves, a microcomputer 14, a driver circuit 20, a printer 21, and a display.
22 and 22.

The switching device 11 includes two transducers 5-1 on the bow and the stern.
And 5-2 are used by switching between them and are composed of a mercury relay or the like. This switching command is sent from the timing generation circuit 9.

The receiver 12 includes a limiter 12a that protects an amplifier in the subsequent stage from a high voltage signal from the pulser circuit 10, an amplifier 12b, and a detector.
And 12c. The amplifier 12b has two
If the transmitters / receivers 5-1 and 5-2 of the system have variations in sensitivity, two systems are provided with amplifiers having different amplification degrees so that the variations can be corrected, and switching is performed in synchronization with the switch 1. It may be configured to be used.

The signal processing circuit 13 includes a comparator 13a for pulsing the input signal, a pulse width discriminating circuit 13b for discriminating whether or not the pulse width of the pulse is equal to or larger than a specified width, and eliminating a pulse width of the pulse and a timing generating circuit. 9. A gate control circuit 13c for setting the gate width by the transmission timing sent from 9 and a pulse discriminated to be above the specified width, and a counter for counting clock pulses while the gate is opened at the set gate width. It has 13d and the main part.
In addition to these, although not shown in the drawings, a noise level determination circuit that determines the noise level of the received signal, and an echo level determination circuit that determines the echo level of the received signal,
And a status creating circuit for forming a status signal from these judgment results. This status is stored in the microcomputer 14 together with the count value of the counter 13d.
Is input to

The microcomputer 14 calculates the ultrasonic pulse reciprocating time based on the count value of the counter 13d, and further calculates the distance from the transducers 5-1 and 5-2 to the ship 1 and the time change thereof. It has a function of calculating the speed and. Further, the normalized distance calculation means 30 and the determination means of this embodiment
It also functions as 40 and displacement information output means 50.

The microcomputer 14 outputs an input / output circuit 15, a central processing unit (hereinafter abbreviated as CPU) 16, a read-only memory 17 (ROM), a readable / writable memory 18 (RAM), and a clock pulse as a reference for calculation. It is composed of a clock oscillator 19 and an input / output circuit 15. The signal processing circuit 13 and the display 22 are connected to the input / output circuit 15. A printer 21 that records data is also connected to the CPU 16 via a driver circuit 20 that amplifies distance and moving speed data.

The ROM 17 stores an operation control program for the CPU 16 and data A indicating the set position of the reference position 7, as well as fixed data such as switching data between measurement distance units "m" and "cm".

In the RAM 18, an operation program for calculating the ultrasonic reciprocating time from the count value of the counter 13d, an operation program for calculating the distance L from the time and the sound velocity, and an operation program for calculating the velocity from the time change of the distance. And a calculation program for calculating the normalized distance D by subtracting the distance A between the transducers 5-1 and 5-2 and the reference position 7 from the distance L, and the normalized distance D is D A determination program for determining whether or not it falls within the range of ≦ 0 and a program for executing various signal processing functions in the measuring instrument body 4 are stored. As a result, the function as the berthing speed meter, the function as the normalized distance calculation means 30, the determination means 40, and the displacement information output means 50 are executed.

The display unit 22 is configured with a large number display unit such as an electronic bulletin board so that it can be viewed from a distance.

<Operation of Embodiment> The present embodiment configured as described above operates as follows. This will be described with reference to the above figures and the flowchart of FIG.

In the ultrasonic berthing speed meter, when the ship 1 berths to the berth position 2, the distance between the bow and stern of the ship and the berth position 2 and the moving speed are measured by the transducer 5-1 installed in seawater. The ultrasonic waves emitted from 5-2 are used to measure the propagation time required for the ultrasonic waves to travel to the ship 1, and to be reflected and returned, and based on this, measure the distance and velocity. .

First, under the control of the microcomputer 14, the measuring device body 4 measures the time required for the ultrasonic pulse to make a round trip (step 1).

That is, the pulsar circuit 10 and the switching device 11 are operated by the transmission timing signal sent from the timing generation circuit 9, and the switching device 11 causes the bow and stern transducers 5-
1 and 5-2 are alternately switched and driven by high-voltage pulses from the pulser circuit 10 to transmit ultrasonic waves and receive reflected waves. The received reflected signal is received by the receiver 12, and the received signal is input to the signal processing circuit 13.

The transmission timing signal is also sent to the gate control circuit 13c of the signal processing circuit 13 to open the input gate of the counter 13d. As a result, the clock pulse from the timing generation circuit 9 is input to the counter 13d and counted.

The received signal from the receiver 12 is pulsed by the comparator 13a, and this pulse is discriminated whether or not the width is equal to or larger than the specified width. This is because, since the transmitted wave is transmitted with a constant pulse width, a pulse width of less than that is regarded as noise and erroneous measurement is prevented.

If the received signal is a pulse having a width equal to or greater than the specified width, it is input to the gate control circuit 13c, whereby the input gate of the counter 13d is closed and the counting of clock pulses is completed.
The count value is input to the microcomputer 14.

The CPU 16 of the microcomputer 14 calculates the distance and speed based on this count value (step 2). These are stored in ROM17 by the operation program stored in RAM18.
Is calculated for each bow and stern based on the fixed data stored in. For example, the distance data of the bow and stern from the transducers 5-1 and 5-2 are independently obtained as L ₁ and L ₂ . The calculation result is temporarily stored in a predetermined area of the RAM 18.

The CPU 16 reads out the calculated distance data from the RAM 18, and determines the normalized distance D from the reference position 7 of the ship 1 based on this data (step 3). That is, the distance A from the transducers 5-1 and 5-2 to the reference position 7 is calculated from the obtained bow and stern distance data L ₁ and L ₂ from the transducers 5-1 and 5-2. Then, the normalized distances D ₁ and D ₂ of the ship from the reference position 7 are calculated.

The calculation result is sent to the display 22 via the input / output circuit 15,
Numbers are displayed (step 4). In this case, in this embodiment, it is displayed in "meter" units. It should be noted that the unit of distance measurement may be another unit meter, for example, "feet", "inch", etc., and "meter" and "feet" can be switched. .

The calculation result may be printed out by the printer 21 via the driver circuit 20.

Up to this point, the operation is performed when the present embodiment functions as a normal berthing speed meter.

Next, a peculiar function of the fender displacement measuring method and device of this embodiment will be described.

Based on the standardized distances D ₁ and D ₂ , the CPU 16 determines whether each of the bow and stern of the ship has reached the reference position (step 5). That is, the determination of D ₁ ≤0 and D ₂ ≤0 is performed. If both D ₁ and D ₂ are greater than 0, the ship 1 is located outside the reference position 7, and therefore step 1
Return to and continue the measurement. On the other hand, if D ₁ and D ₂ are 0 or less, a determination signal indicating that D is 0 or less is output.

As a result, the CPU 16 outputs information corresponding to the standardized distances D ₁ and D ₂ as displacement information of the ship 1 (step 6). That is, the normalized distance D in the range of D ≦ 0 is output as the displacement information. In this embodiment, a printer 21 is provided as an output means, and the printer 21 outputs displacement information.

Here, in this embodiment, the CPU 16 switches the display unit from “m” to “cm”, focusing on the fact that the values of the normalized distances D ₁ and D ₂ are within several meters at the maximum. Is converted into.

Next, the CPU 16 determines whether or not a measurement end command is input from the outside (step 7), and if the measurement end command is input, ends the measurement. On the other hand, if there is no end command, the process returns to step 1 and the measurement is continued.

From the above, until the ship 1 reaches the tip position of the fender 3, it functions only as a normal berthing speed meter, and when the ship 1 reaches the tip position of the fender 3, the normalized distance D is output as displacement information, and The standardized distance D in this state indicates a state in which the boat 1 has entered inside (land side) from the reference position 7. In this state, the hull of the vessel 1 is in pressure contact with the fender 3, so this value represents the displacement amount of the fender 3. Therefore, the damage state of the fender 3 can be detected by monitoring this displacement information.

This detection can be most easily performed by the administrator by periodically checking the record output by the printer 21. It is also possible to automatically perform this detection. For example, the displacement amount which is the elastic limit of the fender 3 is stored in the RAM 18 or ROM 17 in advance, and CP
U16 may monitor whether or not the normalized distance D exceeds this amount, and when it exceeds, an alarm may be issued. As for the secular change, the normalized distance D may be cumulatively added, and when the sum reaches a preset value, a message to replace the fender 3 may be output.

In the above embodiment, the reference position 7 is set to coincide with the tip surface of the fender 3, but the present invention is not limited to this, and the position is inside the tip of the fender 3, outside the tip of the fender 3, etc. Can be set to.

For example, when setting the position inside the tip of the fender 3, the reference position may be set to a position where the fender tip can be displaced within the elastic limit at the maximum in consideration of the elastic limit determined by the design of the fender. For example, it is possible to measure by distinguishing the displacement amount information about the displacement within a range in which the strain hardly remains in the fender and the displacement amount about the displacement that damages the fender.

In this case, the area between the reference position and the tip of the fender can be set in advance as a near area, and the normalized distance D can be output as displacement information from the time when the ship reaches this near area. By doing so, the standardized distance D is displayed with a positive sign up to the reference position, and the standardized distance D is displayed with a negative sign after passing the reference position.

When the reference position is set outside the tip of the fender, the motion of the hull before the collision with the fender can be recorded as the displacement information. Also, with this displacement information,
If necessary, it is possible to detect changes in kinetic energy and kinetic energy of the hull before and after collision, and for damage to the fender,
More detailed information can be obtained.

As described above, according to the present invention, it is possible to easily detect the displacement amount of the fender by using the measurement data of the berth speedometer without providing a special device.

Since the sound velocity of ultrasonic waves in seawater changes depending on the seawater temperature, in order to accurately measure the propagation time of ultrasonic waves, a method such as measuring the seawater temperature and changing the clock frequency based on that value is used. Therefore, it is preferable to correct the temperature change of the sound velocity. In this embodiment, the measurement data is corrected at the time of calculation by the output of a seawater temperature sensor (not shown).

<Modification of Embodiment> In the above embodiments, the position of the ship is displayed by the standardized distance D, but the distance L from the transmitter / receiver to the ship may be displayed by the display.

Further, although the example in which the two wave transmitters / receivers are installed is shown in the above embodiment, the number of wave transmitters / receivers is not limited to this, and may be one or three or more in accordance with the size of the ship to be berthed.

Further, in the above embodiment, the reference position is set by storing the data A indicating the reference position in the ROM, but the data A may be stored in the RAM or the counter. Besides, the data A may be stored in an external storage device. Further, the data A may be directly set by a digital switch or the like.

Further, although the above embodiment is an example of application in the sea, the present invention can be applied not only to the sea but also to lakes, rivers, canals and the like.

[Effect of the Invention] As described above, the present invention has an effect that the displacement amount of the fender can be easily detected by using the measurement data of the berth speedometer without providing a special device.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention.
FIG. 2A is a plan view showing the arrangement of a berth speedometer to which the above embodiment is applied, FIG. 2B is a side view of FIG. 2A, and FIG. 3A is a specific circuit for carrying out one embodiment of the present invention. Block diagram showing the configuration, FIG. 3B is a block diagram showing the configuration of the receiver provided in the measuring instrument body used in the above embodiment, 3C
FIG. 4 is a block diagram showing the configuration of the signal processing circuit provided in the measuring instrument body used in the above embodiment, FIG. 4 is a flow chart showing an example of the operation of the above embodiment, and FIG. 5 is a conventional ultrasonic berthing speed. The top view which shows arrangement | positioning of the meter, FIG. 6 is a side view of FIG. 1 ... Vessel, 2 ... Baying position 3 ... Fender (fender), 4 ... Measuring device main body 5-1, 5-2 ... Transceiver, 6 ... Boat normal 7 ... Reference position , 10 ...... Pulser circuit 11 ...... Switcher, 12 ...... Receiver 13 ...... Signal processing circuit 14 ...... Microcomputer 15 ...... I / O circuit 16 ...... CPU (Central processing unit) 17 ...... ROM, 18 ... ... RAM 20 ... driver circuit, 21 ... printer 22 ... indicator 30 ... standardized distance calculation means 40 ... determination means, 50 ... displacement information output means

Claims (12)

(57) [Claims] 1. An ultrasonic wave is transmitted by a wave transmitter / receiver installed at a berth of a ship, a reflected wave from the ship is received, and the wave is transmitted from the wave transmitter / receiver to the ship according to the time required for the ultrasonic wave to make a round trip. When measuring the distance to and the moving speed of the ship, set the reference position to a certain distance from the transducer, and the distance from the transducer to the ship and from the transducer to the reference position. From the reference position, the standardized distance from the reference position to the ship is calculated, and when the ship reaches the reference position or a near position set in advance near the reference position, the calculated standardized distance is set to the displacement information of the ship. And a displacement amount of the fender tip is obtained from the displacement information as described above, and a fender displacement measuring method using a berthing speedometer. 2. A fender displacement measuring method using a berth speedometer according to claim 1, wherein the reference position is set to coincide with a docking normal. 3. A fender displacement measuring method using a berth speedometer according to claim 1, wherein the reference position is set to coincide with the fender tip position. 4. The displacement information is the displacement amount of the fender tip when the distance from the transducer to the ship becomes smaller than the distance from the transducer to the reference position. A fender displacement measuring method using the berth speedometer described in the paragraph. 5. The scope of claim 1, wherein the reference position is set to a position inside the tip of the fender, and a position from the reference position to the tip of the fender is preset as a neighboring area. A fender displacement measuring method using the described berth speedometer. 6. A fender displacement measuring method using a berth speedometer according to claim 1, wherein the reference position is set to a position outside the tip of the fender. 7. A transducer installed at a shore of a ship for transmitting and receiving ultrasonic waves, and an ultrasonic wave transmitted by the transceiver to receive reflected waves from the ship. The distance from the transmitter / receiver to the ship, and
An ultrasonic berthing speed meter equipped with a measuring instrument main body for measuring the moving speed of the ship, set a reference position at a fixed distance from the transducer, and measuring the distance from the transducer to the ship and A standardized distance calculating means for calculating a standardized distance from the reference position to the ship based on the distance from the wave device to the reference position, and whether or not the ship has reached the reference position or a preset vicinity thereof. Displacement that outputs the calculated normalized distance as displacement information of the ship when it is determined that the ship has reached the reference position or an area in the vicinity thereof set in advance by the determination means A fender displacement measuring device using an ultrasonic berthing speed meter, which is provided with information output means and is configured to detect the amount of displacement of the fender tip from the displacement information. 8. A fender displacement measuring device using a berth speedometer according to claim 7, wherein the reference position is set so as to coincide with the docking normal. 9. A fender displacement measuring device using a berth speedometer according to claim 7, wherein the reference position is set to coincide with the fender tip position. 10. The displacement information as the displacement amount of the fender tip when the distance from the transducer to the ship becomes smaller than the distance from the transducer to the reference position. A fender displacement measuring device using the berth speedometer described in the item. 11. The scope of claim 7, wherein the reference position is set to a position inside the tip of the fender, and a position from the reference position to the tip of the fender is preset as a near area. A fender displacement measuring device using the berth speed meter described. 12. A fender displacement measuring device using a berth speedometer according to claim 7, wherein the reference position is set to a position outside the tip of the fender.