JP6869069B2 - Electromagnetic vibration device - Google Patents

Description

The present invention relates to an electromagnetic vibration device that vibrates a structure to be vibrated by an electromagnetic force.

For example, many large structures are installed in various plant equipment such as nuclear power equipment. In this type of plant equipment, it is required to vibrate a large structure (structure to be vibrated) at the time of new construction or restart, and measure the damping ratio thereof.

Conventionally, as a means for vibrating a large structure, an electromagnet is placed facing the structure to be vibrated, and the exciting current and its frequency of the electromagnet are controlled to control the vibrating amplitude of the structure to be vibrated. Is known (see, for example, Patent Document 1). In the configuration in which the electromagnet is used for vibration, the electromagnet is arranged in a non-contact state with the structure to be excited, so that a structure for gripping the electromagnet is not required at the vibration point, and further, the electromagnet is excited. Since the swing point can be changed relatively freely, there is an advantage that the device configuration is simplified.

Jitsufuku No. 01-31945

However, in the above-mentioned conventional configuration, an electromagnet that exerts an electromagnetic force (attracting force) on the structure to be vibrated is arranged on one side of the structure to be vibrated, and the electromagnet can exert only an attractive force. Therefore, when it is desired to vibrate with a predetermined waveform (for example, an arbitrary waveform such as a sine wave), it is necessary to apply a predetermined initial suction force (preload) to the structure to be vibrated. When a predetermined initial attractive force is applied to the structure to be excited, the vibration characteristics of the structure to be excited are changed, so that it is unavoidable to offset the exciting current of the electromagnet. Further, in order to suppress the offset of the exciting current, it is assumed that a permanent magnet or the like is provided in the structure to be excited, but in this case, there is a problem that the device configuration becomes complicated.

The present invention has been made in view of the above circumstances, and provides an electromagnetic vibration apparatus capable of exciting a structure to be excited with a simple apparatus configuration without offsetting the exciting current. The purpose is.

In order to solve the above-mentioned problems and achieve the object, the electromagnetic vibration device according to the present invention includes a pair of electromagnetic coils arranged so as to sandwich the structure to be excited, and excites a predetermined vibration waveform. The positive half-wave component of the current is input to one electromagnetic coil, the negative half-wave component of the exciting current is input to the other electromagnetic coil, and the structure to be excited is alternately attracted by the electromagnetic force of the pair of electromagnetic coils. It is characterized by.

According to this configuration, by inputting the positive half-wave component and the negative half-wave component of the exciting current into the pair of electromagnetic coils, the structure to be excited can be alternately attracted by the electromagnetic force of each electromagnetic coil. Therefore, the structure to be excited can be excited without offsetting the exciting current. Therefore, it is possible to perform appropriate vibration while suppressing changes in the vibration characteristics of the structure to be vibrated.

In this configuration, the pair of electromagnetic coils may be arranged to face each other with the structure to be vibrated interposed therebetween. According to this configuration, the structures to be vibrated can be sucked in opposite directions on a predetermined same straight line, and the structures to be vibrated can be vibrated more appropriately with a simple device configuration. ..

Further, a waveform generation unit that generates a positive half wave component and a negative half wave component of the vibration waveform may be provided. According to this configuration, since the waveform generator can arbitrarily generate the positive half wave component and the negative half wave component of the vibration waveform, the positive half wave component and the negative half wave component to be appropriately generated are appropriately generated according to the excitation state. The half-wave component can be changed and modified.

Further, an oscillating unit that oscillates the oscillating waveform and a rectifying unit that rectifies the exciting current of the oscillated excitation waveform into a positive half wave component and a negative half wave component, respectively, may be provided. According to this configuration, it is not necessary to oscillate a special waveform, and an arbitrary excitation waveform can be rectified into a positive half-wave component and a negative half-wave component and separated by a rectifying unit. Therefore, the configuration of the vibration exciter can be simplified.

Further, the rectifying unit may be a semiconductor diode. According to this configuration, it is possible to realize miniaturization and simplification of the vibration exciter.

Further, an amplification unit may be provided between the oscillation unit and the rectification unit. According to this configuration, the number of amplifiers can be reduced, and the cost and the installation area of the equipment can be reduced.

Further, a vibration force measuring unit that measures the excitation force of each pair of electromagnetic coils and a control unit that controls the excitation waveform based on the measured excitation force may be provided. According to this configuration, the control unit can oscillate the oscillating unit with a more accurate excitation waveform, and the structure to be oscillated can be oscillated more appropriately.

Further, a magnetic flux density measuring unit that measures the magnetic flux densities of the pair of electromagnetic coils, and a control unit that controls the excitation waveform based on the measured magnetic flux densities may be provided. According to this configuration, the control unit can oscillate the oscillating unit with a more accurate excitation waveform, and the structure to be oscillated can be oscillated more appropriately.

According to the present invention, by inputting the positive half-wave component and the negative half-wave component of the exciting current into the pair of electromagnetic coils, the structure to be excited can be alternately attracted by the electromagnetic force of each electromagnetic coil. Therefore, the structure to be excited can be excited without offsetting the exciting current. Therefore, it is possible to perform appropriate vibration while suppressing changes in the vibration characteristics of the structure to be vibrated.

FIG. 1 is a side view showing a schematic configuration of a vibration target structure to which the electromagnetic vibration device according to the first embodiment is attached. FIG. 2 is a block diagram showing a functional configuration of the vibration exciter according to the first embodiment. FIG. 3 is a block diagram showing a functional configuration of the vibration exciter according to the second embodiment. FIG. 4 is a block diagram showing a functional configuration of the vibration exciter according to the third embodiment. FIG. 5 is a block diagram showing a functional configuration of the vibration exciter according to the fourth embodiment. FIG. 6 is a block diagram showing a functional configuration of the vibration exciter according to the fifth embodiment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the embodiment include those that can be easily replaced by those skilled in the art, or those that are substantially the same. Furthermore, the components described below can be combined as appropriate.

[First Embodiment]
FIG. 1 is a side view showing a schematic configuration of a vibration target structure to which the electromagnetic vibration device according to the first embodiment is attached. In the present embodiment, the steam generator 101 as shown in FIG. 1 will be illustrated and described as the structure to be vibrated. The steam generator 101 is a large-scale structure that exchanges heat between a high-temperature and high-pressure primary coolant supplied from a nuclear reactor and a secondary coolant that moves a steam turbine in a nuclear power facility having a pressurized water reactor.

As shown in FIG. 1, the steam generator 101 has a body portion 102 having a hollow cylindrical shape that is elongated in the vertical direction and is sealed. The lower half of the body 102 has a slightly smaller diameter than the upper half, and connects the lower body 102a forming the lower half, the upper body 102b forming the upper half, and the lower body 102a and the upper body 102b. It is composed of a truncated cone-shaped conical body 102c and an upper mirror 102d provided at the upper end of the upper body 102b. Further, the steam generator 101 is provided with a water chamber mirror 103 at the lower end portion. The steam generator 101 is provided with a plurality of heat transfer tubes having an inverted U shape and being elongated in the vertical direction inside the lower body 102a. Further, the steam generator 101 has an air-water separator that separates the supply water into steam and hot water inside the upper body 102b, and a moisture content that removes the moisture content of the separated steam to bring it into a state close to dry steam. A separator is provided. Further, in the steam generator 101, a water supply pipe 111 for supplying secondary cooling water from the outside into the lower body 102a is connected to the lower part of the upper body 102b. Further, in the steam generator 101, a steam discharge pipe 112 is connected to the upper end of the upper mirror 102d. Further, in the steam generator 101, the water chamber mirror 103 is separated by the lower body 102a of the body portion 102 and the pipe plate 104, and the inside is divided into two water chambers by a partition wall. One end of the heat transfer tube penetrates the tube plate and communicates with the one water chamber, and the cooling water pipe 113 to which the primary coolant is supplied from the reactor is connected. In the other water chamber, the other end of the heat transfer tube is communicated through the tube plate, and the cooling water pipe 114 for returning the primary coolant to the reactor is connected.

Such a steam generator 101 is installed inside a reactor containment vessel in a radiation controlled area. The reactor containment vessel is firmly formed of concrete. The steam generator 101 is installed in a loop chamber 121 partitioned by a concrete partition wall 122 inside the reactor containment vessel. In the steam generator 101, the water chamber mirror 103 is connected to the bottom floor 123 of the loop chamber 121 by a plurality of (for example, four) support legs 131, and the water supply pipe 111, the steam discharge pipe 112, and the cooling water described above are connected. By connecting the pipes 113 and 114, they are supported inside the reactor containment vessel (loop chamber 121). Further, the steam generator 101 is supported by the partition wall 122 via the upper support 132 and the lower support 133.

The upper support 132 has an annular (for example, octagonal) ring frame 132A provided around the upper end of the lower body 102a of the steam generator 101, and extends horizontally from the partition wall 122 toward the ring frame 132A. It is provided with a support support 132B provided so as to be present. The ring frame 132A is provided so as to be suspended from the steam generator 101 side (for example, the conical body 102c).

Further, the lower support 133 extends horizontally from the partition wall 122 toward the ring frame 133A and the annular (for example, octagonal) ring frame 133A provided so as to surround the water chamber mirror 103 of the steam generator 101. It is provided with a support support 133B provided so as to be present. The ring frame 133A is provided so as to be suspended from the steam generator 101 side (for example, the lower body 102a or the pipe plate 104).

The upper support 132 has an interval adjusting device 1 between the steam generator 101 and the ring frame 132A, and between the ring frame 132A and the support support 132B, respectively. Similarly, the lower support 133 has an interval adjusting device 1 between the steam generator 101 and the ring frame 133A, and between the ring frame 133A and the support support 133B, respectively.

The interval adjusting device 1 is attached to the ring frames 132A, 133A and the support supports 132B, 133B, and is provided at a predetermined interval in advance with respect to the steam generator 101 and the ring frames 132A, 133A. It suppresses the influence of heat elongation of the generator 101 and ring frames 132A and 133A, and suppresses the influence of vibration of the steam generator 101 and ring frames 132A and 133A.

By the way, in a large structure such as the steam generator 101, it is required to vibrate the steam generator 101 and measure the damping ratio of the vibration at the time of new installation or restart. The body 102 of the steam generator 101 is made of carbon steel, which is a magnetic material. Therefore, in the present embodiment, the steam generator 101 as the structure to be vibrated includes a vibration device (electromagnetic vibration device) 10 that vibrates the steam generator 101 by using an electromagnetic force and its damping. A damping ratio measuring device (not shown) for measuring the ratio is provided. As shown in FIG. 1, the vibration exciter 10 includes a first electromagnetic coil 11A and a second electromagnetic coil 11B arranged so as to sandwich the body portion 102 of the steam generator 101. The first electromagnetic coil 11A and the second electromagnetic coil 11B are each formed of a conductive wire (for example, a copper metal wire). The first electromagnetic coil 11A and the second electromagnetic coil 11B are each wound around a core material (not shown) made of a magnetic material such as iron, and a current (not shown) is applied to the first electromagnetic coil 11A and the second electromagnetic coil 11B, respectively. It constitutes an electromagnet that generates an electromagnetic force (attracting force) by supplying an exciting current).

The first electromagnetic coil 11A and the second electromagnetic coil 11B are arranged on the upper part (upper body 102b) of the steam generator 101, and are supported by, for example, a robot arm (support portion) 140 attached to the partition wall 122. The positions of the first electromagnetic coil 11A and the second electromagnetic coil 11B can be freely changed with respect to the steam generator 101 within the movable range of the robot arm 140. Therefore, the first electromagnetic coil 11A and the second electromagnetic coil 11B can be freely installed at a position avoiding the pipes and peripheral devices provided around the upper body 102b.

Further, as described above, in the steam generator 101, the water chamber mirror 103 is supported on the bottom floor 123 of the loop chamber 121 by the support legs 131, and the steam generator 101, the upper support 132, and the lower support 133 are provided. A predetermined interval is provided between them in consideration of the influence of heat elongation of the steam generator 101 and the like. Therefore, in this configuration, the first electromagnetic coil 11A and the second electromagnetic coil 11B of the vibration exciter 10 are arranged on the upper portion (upper body 102b) separated from the support leg 131 (fulcrum) of the steam generator 101. , The steam generator 101 can be effectively vibrated.

Next, a specific configuration of the vibration exciter 10 will be described. FIG. 2 is a block diagram showing a functional configuration of the vibration exciter according to the first embodiment. As shown in FIG. 2, the vibration exciter 10 includes a first electromagnetic coil 11A and a second electromagnetic coil 11B, a first amplifier 12A and a second amplifier 12B, and a digital signal processor (waveform generator) 13. .. The digital signal processor 13 generates an excitation signal of the exciting current input to the first electromagnetic coil 11A and the second electromagnetic coil 11B, respectively. In the present embodiment, a positive half-wave component WA and a negative half-wave component WB of a predetermined excitation waveform (for example, a sine wave) are generated as excitation signals, respectively, and the regular half-wave component WA is transferred to the first electromagnetic coil 11A. It is supplied and the negative half-wave component WB is supplied to the second electromagnetic coil 11B.

The positive half-wave component WA and the negative half-wave component WB are synchronized with each other, and a predetermined excitation waveform (for example, a sine wave) is formed by synthesizing them. In the present embodiment, a sine wave is exemplified as the excitation waveform, but the present invention is not limited to this, and any waveform can be used as long as the positive half wave component WA and the negative half wave component WB are synchronized. Further, the amplitudes of the positive half-wave component WA and the negative half-wave component WB do not necessarily have to be the same, and one amplitude may be formed larger than the other.

The first amplifier 12A and the second amplifier 12B amplify the exciting current according to the shape of the excitation signal (the positive half-wave component WA and the negative half-wave component WB of the excitation waveform) generated by the digital signal processor 13. And output.

The first electromagnetic coil 11A and the second electromagnetic coil 11B cause the steam generator 101 to exert an electromagnetic force exerted by the input exciting current. Since the electromagnetic force increases as the magnitude of the exciting current increases, the first electromagnetic coil 11A generates an electromagnetic force (attracting force) in a phase in which the amplitude of the half-wave component WA is large. Similarly, the second electromagnetic coil 11B generates an attractive force in a phase in which the amplitude of the negative half-wave component WB is large. Since the positive half-wave component WA and the negative half-wave component WB are synchronized with each other, no electromagnetic force is generated in the second electromagnetic coil 11B when the first electromagnetic coil 11A is sucking the steam generator 101. Similarly, when the second electromagnetic coil 11B is sucking the steam generator 101, no electromagnetic force is generated in the first electromagnetic coil 11A. Therefore, the steam generator 101 can be vibrated by the first electromagnetic coil 11A and the second electromagnetic coil 11B alternately sucking the steam generator 101.

Further, the first electromagnetic coil 11A and the second electromagnetic coil 11B are arranged so as to face each other with the steam generator 101 interposed therebetween. Therefore, the steam generator 101 can be sucked in opposite directions on a predetermined same straight line, and the steam generator 101 can be appropriately vibrated.

Here, when a large structure such as the steam generator 101 is vibrated, it is also possible to suck and vibrate from one side of the steam generator 101 by an electromagnetic force as in the conventional configuration. However, since electromagnetic force (electromagnet) can only generate attractive force, if you want to vibrate with a sine wave (or arbitrary waveform), you need to change the exciting force while generating a predetermined initial attractive force (preload). There is.

Generally, when a large structure with strong non-linearity is vibrated, the vibration characteristics change when the initial suction force is applied (input), so there is a high demand for vibration without applying the initial suction force. In the conventional configuration, only the attractive force can be generated from the electromagnet, and the generation of the excitation current offset cannot be avoided. If the exciting current is offset, the vibration characteristics may change from the installed state when vibrating a structure exhibiting non-linearity, which is not desirable. For example, when vibrating a support (structure) with backlash, you want to simulate the backlash vibration behavior during an earthquake, but if there is an offset current, the suction force will always act, so the backlash will be clogged. Problems such as being able to test only in a state may occur. Further, in general, when a magnetic field is applied to a magnetic material, the upper limit at which a magnetic force can be generated is determined (saturated magnetic field), and if the magnetic field is strengthened, an attractive force is not generated indefinitely. Therefore, in the configuration in which the offset component that does not contribute to the vibration is input, the capacity of the suction force is reduced by that amount, and as a result, the maximum vibration force is limited. Therefore, it is preferable that the exciting current is not offset when the vibration is applied.

According to the present embodiment, the excitation device 10 includes a first electromagnetic coil 11A and a second electromagnetic coil 11B arranged so as to sandwich the steam generator 101, and has a positive excitation current having a predetermined excitation waveform. The half-wave component WA is input to the first electromagnetic coil 11A, the negative half-wave component WB of the exciting current is input to the second electromagnetic coil 11B, and the steam generator 101 is exhibited by the first electromagnetic coil 11A and the second electromagnetic coil 11B. Since each electromagnetic force alternately sucks and vibrates, the steam generator 101 can be appropriately vibrated with a simple configuration without offsetting the exciting current as in the conventional case.

Further, according to the present embodiment, since the first electromagnetic coil 11A and the second electromagnetic coil 11B are arranged so as to face each other with the steam generator 101 interposed therebetween, the steam generator 101 is placed in a predetermined same straight line. The steam generator 101 can be vibrated more appropriately because it can be sucked in the opposite directions on the line.

Further, according to the present embodiment, the vibrating device 10 is a digital signal processor as a waveform generator that generates a positive half-wave component WA and a negative half-wave component WB of a predetermined vibration waveform (for example, a sine wave). Since 13 is provided, a desired positive half-wave component WA and negative half-wave component WB can be generated, and the generated positive half-wave component WA and negative half-wave component WB are appropriately changed according to the excitation state. It can be fixed.

[Second Embodiment]
Next, the vibration exciter 20 according to the second embodiment will be described. FIG. 3 is a block diagram showing a functional configuration of the vibration exciter according to the second embodiment. In the first embodiment described above, the vibrating device 10 includes a digital signal processor 13 that generates a positive half-wave component WA and a negative half-wave component WB of a predetermined vibration waveform, respectively. In the embodiment, the configuration is different in that a predetermined excitation waveform is rectified to demultiplex the positive half wave component WA and the negative half wave component WB. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 3, the vibration exciter 20 includes a first electromagnetic coil 11A and a second electromagnetic coil 11B, a first amplifier 12A and a second amplifier 12B, a first rectifying element 21A, and a second rectifying element 21B. A rectifying unit 21 and a function generator (oscillating unit) 22 are provided. The function generator 22 oscillates a vibration waveform W having a predetermined shape (for example, a sine wave). The oscillated vibration waveform W may be any waveform whose amplitude and wavelength fluctuate as long as it is a continuous waveform.

The rectifying unit 21 allows the flow from the function generator 22 to the first amplifier 12A (direction of arrow A) and prohibits the opposite flow (direction of arrow B) from the first rectifying element 21A and the function generator from the second amplifier 12B. A second rectifying element 21B that allows the flow to 22 (direction of arrow B) and prohibits the opposite flow (direction of arrow A) is provided. The first rectifying element 21A and the second rectifying element 21B are configured to include a semiconductor diode.

The excitation signal (vibration waveform) output from the function generator 22 in the direction of arrow A passes through the first rectifying element 21A, is rectified, and is returned to the function generator 22 via the first amplifier 12A. Further, the vibration signal (vibration waveform W) output from the function generator 22 in the direction of arrow B passes through the second rectifying element 21B, is rectified, and is returned to the function generator 22 via the second amplifier 12B. ..

The vibration signal (vibration waveform W) is rectified by the first rectifying element 21A and the second rectifying element 21B, and is separated into a positive half-wave component WA and a negative half-wave component WB. The first amplifier 12A amplifies the half-wave component WA of the exciting current and supplies it to the first electromagnetic coil 11A. Further, the second amplifier 12B amplifies the negative half-wave component WB of the exciting current and supplies it to the second electromagnetic coil 11B.

In the present embodiment, since one excitation waveform W is separated by the first rectifying element 21A and the second rectifying element 21B, the positive half-wave component WA and the negative half-wave component WB are synchronized. Therefore, by supplying the positive half-wave component WA of the exciting current to the first electromagnetic coil 11A and the negative half-wave component WB to the second electromagnetic coil 11B, the first electromagnetic coil 11A and the second electromagnetic coil 11B become , The electromagnetic force exerted by the input exciting current is alternately applied to the steam generator 101. Therefore, the steam generator 101 can be vibrated by the first electromagnetic coil 11A and the second electromagnetic coil 11B alternately sucking the steam generator 101.

The excitation device 20 of the present embodiment has a function generator 22 that oscillates the excitation waveform W, and a first rectifying the exciting current of the oscillated excitation waveform W into a positive half-wave component WA and a negative half-wave component WB, respectively. Since the first rectifying element 21A and the second rectifying element 21B are provided, no special waveform output is required, and the first rectifying element 21A and the second rectifying element 21B have an arbitrary vibration waveform W negative with the regular half-wave component WA. It can be separated into a half-wave component WB. Therefore, the configuration of the vibration exciter 20 can be simplified.

Further, according to the present embodiment, since the semiconductor diode is used as the first rectifying element 21A and the second rectifying element 21B, the device can be miniaturized and simplified. Further, in the present embodiment, since the function generator 22 that oscillates the vibration waveform W can easily change the vibration conditions including the vibration waveform, the vibration device 20 is actually arranged around the steam generator 101. In some cases, it is easy to change the vibration conditions at the site, which can contribute to speeding up the vibration test.

In the present embodiment, an example in which a semiconductor diode is used as the first rectifying element 21A and the second rectifying element 21B of the rectifying unit 21 is shown, but if the excitation waveform W can be rectified, another configuration is shown. Can also be used, for example, a mercury rectifier or a thyristor may be used.

[Third Embodiment]
Next, the vibration exciter 30 according to the third embodiment will be described. FIG. 4 is a block diagram showing a functional configuration of the vibration exciter according to the third embodiment. In the second embodiment described above, the vibrating apparatus 20 is configured to rectify a predetermined vibrating waveform W, separate it into a positive half-wave component WA and a negative half-wave component WB, and then amplify it. In the embodiment, the configuration is different in that it is rectified after amplification and separated into a positive half-wave component WA and a negative half-wave component WB. The same configurations as those of the first embodiment and the second embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 4, the oscillating device 30 includes a rectifying unit 31 including a first electromagnetic coil 11A and a second electromagnetic coil 11B, a first rectifying element 31A and a second rectifying element 31B, an amplifier 32, and a function generator. The (oscillating unit) 22 is provided. The function generator 22 oscillates a predetermined excitation waveform W and outputs it to the amplifier (amplification unit) 32.

The amplifier 32 amplifies the exciting current of the oscillated predetermined excitation waveform W and outputs it to the rectifying unit 31. The rectifying unit 31 allows the flow from the amplifier 32 to the first electromagnetic coil 11A (direction of arrow A) and prohibits the opposite flow (direction of arrow B) from the first rectifying element 31A and the amplifier from the second electromagnetic coil 11B. A second rectifying element 31B that allows the flow to 32 (direction of arrow B) and prohibits the opposite flow (direction of arrow A) is provided. The first rectifying element 31A and the second rectifying element 31B are rectifying elements for high power and are configured to include a semiconductor diode.

The exciting current of the excitation waveform W output from the function generator 22 is amplified by the amplifier 32, then flows in the direction of arrow A, passes through the first rectifying element 31A, is rectified, and is rectified via the first electromagnetic coil 11A. , Returned to the amplifier 32. Further, the exciting current of the excitation waveform W output from the function generator 22 is amplified by the amplifier 32, then flows in the direction of arrow B, passes through the second rectifying element 31B, is rectified, and causes the second electromagnetic coil 11B. It is returned to the amplifier 32 via.

The exciting current having the excitation waveform W is rectified by the first rectifying element 31A and the second rectifying element 31B, and is separated into a positive half wave component WA and a negative half wave component WB. The half-wave component WA of the exciting current is supplied to the first electromagnetic coil 11A. Further, the negative half-wave component WB of the exciting current is supplied to the second electromagnetic coil 11B.

In the present embodiment, the vibration waveform W output from the function generator 22 is amplified by the amplifier 32 and then separated by the first rectifying element 31A and the second rectifying element 31B, so that the positive half wave component WA and the negative half wave are separated. It is synchronized with the component WB. Therefore, by supplying the positive half-wave component WA of the exciting current to the first electromagnetic coil 11A and the negative half-wave component WB to the second electromagnetic coil 11B, the first electromagnetic coil 11A and the second electromagnetic coil 11B become , The electromagnetic force exerted by the input exciting current is alternately applied to the steam generator 101. Therefore, the steam generator 101 can be vibrated by the first electromagnetic coil 11A and the second electromagnetic coil 11B alternately sucking the steam generator 101.

Since the excitation device 30 of the present embodiment includes an amplifier 32 between the function generator 22 that oscillates the excitation waveform W and the first rectifying element 31A and the second rectifying element 31B, the first rectifying element The 31A and the second rectifying element 31B rectify the exciting current after being amplified by the amplifier 32, respectively, and separate the excitation current into a positive half-wave component WA and a negative half-wave component WB. Therefore, as compared with the configuration of the second embodiment, the number of amplifiers can be reduced, and the cost and the installation area of the equipment can be reduced. Further, in the present embodiment, since the exciting current after being amplified by the amplifier 32 is rectified by the first rectifying element 31A and the second rectifying element 31B, the positive half-wave component WA and the negative half-wave component WB of the exciting current are combined. The frequency characteristics can be improved.

[Fourth Embodiment]
Next, the vibration exciter 40 according to the fourth embodiment will be described. FIG. 5 is a block diagram showing a functional configuration of the vibration exciter according to the fourth embodiment. The present embodiment is different from the third embodiment in that it has a configuration in which the excitation force (electromagnetic force) of each electromagnetic coil is measured and the excitation waveform is controlled based on the measured excitation force. To do. The same configurations as those of the first to third embodiments are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, the oscillating device 40 includes a rectifying unit 31 including a first electromagnetic coil 11A and a second electromagnetic coil 11B, a first rectifying element 31A and a second rectifying element 31B, an amplifier 32, and a function generator. A (oscillation unit) 22, a first load cell 41A and a second load cell 41B, and a control unit 42 are provided.

The first load cell 41A is arranged on the base end side (the side away from the steam generator 101) of the first electromagnetic coil 11A, and the first electromagnetic coil 11A exerts when the half-wave component WA of the exciting current is supplied. Measure the electromagnetic force (excitation force) to be applied. Similarly, the second load cell 41B is arranged on the proximal end side (the side away from the steam generator 101) of the second electromagnetic coil 11B, and the second electromagnetic coil is supplied when the negative half-wave component WB of the exciting current is supplied. The electromagnetic force (excitation force) exerted by 11B is measured. In the present embodiment, the first load cell 41A and the second load cell 41B function as an exciting force measuring unit for measuring an exciting force.

The first load cell 41A and the second load cell 41B output the measured electromagnetic force (vibration force) to the control unit 42. The control unit 42 controls the function generator 22 based on the measured magnitude of the electromagnetic force (excitation force). Specifically, the control unit 42 compares the maximum value of the measured electromagnetic force (vibration force) with a predetermined threshold value, and when the maximum value is smaller than the threshold value, increases the amplitude of the excitation waveform W. The function generator 22 is controlled so as to. Further, the function generator 22 may be controlled so as to calculate the difference between the target excitation waveform and the input (measured) excitation force and compensate the difference amount for each step. Alternatively, the frequency (wavelength) of the excitation waveform W may be controlled.

In general, the amplitude when a large structure such as the steam generator 101 is vibrated is relatively small (on the order of mm), so that the distance dependence of the electromagnetic force exerted by the first electromagnetic coil 11A and the second electromagnetic coil 11B is Basically it doesn't matter. However, in the vibration device 40 according to the present embodiment, the vibration force applied to the steam generator 101 by the first electromagnetic coil 11A and the second electromagnetic coil 11B and the first electromagnetic coil 11A and the second electromagnetic coil 11B is measured. Since the first load cell 41A and the second load cell 41B and the control unit 42 that controls the function generator 22 that oscillates the excitation waveform W based on the measured excitation force are provided, a more accurate excitation waveform W can be obtained. It can oscillate and the steam generator 101 can be properly vibrated.

In the present embodiment, the first load cell 41A and the second load cell 41B, and the control unit 42 that controls the function generator 22 that oscillates the excitation waveform W based on the measured excitation force, are configured in the third embodiment. Although the example added to the above has been described, the present invention is not limited to this, and it goes without saying that the example may be added to the configuration of the first embodiment or the second embodiment.

[Fifth Embodiment]
Next, the vibration exciter 50 according to the fifth embodiment will be described. FIG. 6 is a block diagram showing a functional configuration of the vibration exciter according to the fifth embodiment. The present embodiment is different from the fourth embodiment in that the magnetic flux density of each electromagnetic coil is measured and the excitation waveform is controlled based on the measured magnetic flux density. The same configurations as those of the first to fourth embodiments are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6, the vibration exciter 50 includes a rectifying unit 31 including a first electromagnetic coil 11A and a second electromagnetic coil 11B, a first rectifying element 31A and a second rectifying element 31B, an amplifier 32, and a function generator. It includes a (oscillating unit) 22, a first Hall element 51A and a second Hall element 51B, and a control unit 52.

The first Hall element 51A is arranged on the tip side (steam generator 101 side) of the first electromagnetic coil 11A, and measures the magnetic flux density of the first electromagnetic coil 11A when the half-wave component WA of the exciting current is supplied. To do. Similarly, the second Hall element 51B is arranged on the tip side (steam generator 101 side) of the second electromagnetic coil 11B, and the magnetic flux of the second electromagnetic coil 11B is supplied when the negative half-wave component WB of the exciting current is supplied. Measure the density. In the present embodiment, the first Hall element 51A and the second Hall element 51B function as a magnetic flux density measuring unit for measuring the magnetic flux density.

The first Hall element 51A and the second Hall element 51B output the measured magnetic flux density to the control unit 52. The control unit 52 controls the function generator 22 based on the measured magnetic flux density. Specifically, the control unit 52 calculates the difference between the target excitation waveform and the input (measured) magnetic flux density, and controls the function generator 22 so as to compensate the difference amount for each step. Alternatively, the frequency (wavelength) of the excitation waveform W may be controlled.

In the vibration device 50 according to the present embodiment, the first Hall element 51A and the second hole for measuring the magnetic flux densities of the first electromagnetic coil 11A and the second electromagnetic coil 11B and the first electromagnetic coil 11A and the second electromagnetic coil 11B. Since the element 51B and the control unit 52 that controls the function generator 22 that oscillates the vibration waveform W based on the measured magnetic flux density are provided, a more accurate vibration waveform W can be oscillated, and the steam generator. The 101 can be properly oscillated.

In the present embodiment, the first Hall element 51A and the second Hall element 51B, and the control unit 52 that controls the function generator 22 that oscillates the excitation waveform W based on the measured magnetic flux density, are the third embodiment. Although the example added to the configuration has been described, the present invention is not limited to this, and it goes without saying that the configuration may be added to the configuration of the first embodiment or the second embodiment.

Although one embodiment of the present invention has been described above, the present embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The present embodiment and its modifications are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof. In the above-described embodiment, the steam generator 101 is exemplified as the structure to be vibrated in which the vibrating devices 10 to 50 are arranged, but the present invention is not limited to this, and various types of nuclear facilities having a pressurized water reactor are used. It may be a structure, or may be, for example, a structure in a nuclear facility having another reactor such as a boiling water reactor. Further, the structure is not limited to nuclear power equipment, and may be a large structure installed in other equipment such as thermal power generation equipment.

10, 20, 30, 40, 50 Vibration device 11A 1st electromagnetic coil (electromagnetic coil)
11B 2nd electromagnetic coil (electromagnetic coil)
12A 1st amplifier (amplifier)
12B 2nd amplifier (amplifier)
13 Digital signal processor (waveform generator)
21, 31 Rectifier 21A, 31A 1st rectifier 21B, 31B 2nd rectifier 22 Function generator (oscillator)
32 Amplifier (Amplifier)
41A 1st load cell (excitation force measurement unit)
41B 2nd load cell (excitation force measurement unit)
42, 52 Control unit 51A 1st Hall element (magnetic flux density measurement unit)
51B 2nd Hall element (magnetic flux density measurement unit)
101 Steam generator (structure to be vibrated)
122 Septum 131 Support leg W Vibration waveform WA Positive half wave component WB Negative half wave component

Claims (8)

Steam that is installed on the bottom floor of the loop chamber separated by the partition wall of the reactor containment vessel and has a long body extending in the vertical direction and a plurality of support legs connected to the lower end of the body. An electromagnetic vibration device that vibrates the generator.
It is arranged across the top cylinder forming the upper half of the body portion, a pair of electromagnetic coils that will be supported by a support portion extending from said partition wall, one of the positive half-wave component of the excitation current having a predetermined vibration waveform The electromagnetic coil is characterized in that the negative half-wave component of the exciting current is input to the other electromagnetic coil, and the steam generator is alternately attracted and vibrated by the electromagnetic force of the pair of the electromagnetic coils. Electromagnetic vibration device. The electromagnetic vibration apparatus according to claim 1, wherein the pair of electromagnetic coils are arranged so as to face each other with the upper body interposed therebetween. The electromagnetic vibration apparatus according to claim 1 or 2, further comprising a waveform generator that generates the positive half-wave component and the negative half-wave component of the vibration waveform, respectively. It is characterized by including an oscillating unit that oscillates the oscillating waveform and a rectifying unit that rectifies the oscillated exciting current of the oscillating waveform into the positive half-wave component and the negative half-wave component, respectively. The electromagnetic oscillator according to claim 1 or 2. The electromagnetic vibration apparatus according to claim 4, wherein the rectifying unit is a semiconductor diode. The electromagnetic vibration apparatus according to claim 4 or 5, wherein an amplification unit is provided between the oscillation unit and the rectification unit. The claim is characterized in that it includes a vibration force measuring unit that measures the vibration force of each of the pair of electromagnetic coils, and a control unit that controls the vibration waveform based on the measured vibration force. The electromagnetic vibration exciter according to any one of 1 to 6. Claims 1 to 6 include a magnetic flux density measuring unit that measures each of the magnetic flux densities of the pair of electromagnetic coils, and a control unit that controls the vibration waveform based on the measured magnetic flux densities. The electromagnetic exciter according to any one of the above items.

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