JP2003176849A - Pneumatic type vibratory exciting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic type vibratory exciting device capable of suppressing affixation of a mass member to an elastic member in association with a pressure variation in air chambers and generating a proper vibration suppressing effect. <P>SOLUTION: A vibration control device 10 is equipped with a mounting member 11 having supports 17 and 18 separated up and down from each other and a coupling frame 12 to couple together the supports, a mass member 19 installed between the supports, elastic member coupling parts 21 and 23 to couple the mass member elastically with the supports, and an upper and a lower air chamber K<SB>1</SB>and K<SB>2</SB>formed between the supports and mass member in the tightly closed condition. Solenoid valves 29 and 34 are interposed in a pair of air passages connected with the respective air chambers so as to change over the communicating condition to the air chambers of two air pressure sources having different air pressures. An electric control device 50 controls the changeover operations of the two solenoid valves in conformity to the first and second control pulse signals decided from the reference frequency component of the vibration controlled and generates a pressure change inside the upper and lower air chambers. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention changes the communication state of two air pressure sources having different air pressures to the air chamber of a vibrating device alternately by an electromagnetic switching means to cause a pressure change inside the air chamber. The present invention relates to a pneumatic vibrating device that actively suppresses vibration of a controlled object by vibrating a mass member based on a change in the pressure.

[0002]

2. Description of the Related Art Conventionally, as an exciter of a pneumatic exciter of this type, as shown in, for example, Japanese Unexamined Patent Publication No. 10-169705, a mounting bracket to be mounted on a vibrating body to be controlled and a mounting bracket. A mass member that is disposed above or below the rubber member, a rubber elastic body that elastically connects the mounting bracket and the mass member, and an air chamber that is enclosed by the rubber elastic body between the mounting bracket and the mass member and is in a sealed state. Those with and are known. The air chamber is connected via an air flow passage to a negative pressure generation source, which is two air pressure supply sources having different pressures, and the atmosphere side, and the air flow passage is connected to the air chamber, the negative pressure generation source, and the atmosphere side. An electromagnetic valve that alternately switches to the connected state is installed. Then, by switching the electromagnetic valve based on the control of the electric control device, the air chamber is alternately switched between the negative pressure state and the atmospheric pressure state, and the air pressure change is generated in the air chamber. Due to this change in air pressure, a vibrating force is generated in the mass member, and the vibration of the mass member is transmitted to the vibrating body side through the rubber elastic body, whereby vibration on the vibrating body side can be suppressed.

[0003]

By the way, in the case of the pneumatic type vibration device described above, the mass member is driven only by suctioning downward or upward by setting the negative pressure in the air chamber, and the atmospheric pressure in the air chamber is generated. When it is returned to, the mass member is returned upward or downward by the rubber elastic body. However, depending on the frequency and duty ratio of the control signal, when the air chamber is returned to atmospheric pressure, the rubber elastic body does not return to its original state, and the state in which the mass member sticks to the rubber elastic body is likely to occur. Such sticking of the mass member to the rubber elastic body causes a problem that particularly high-order components of the vibration control characteristics are deteriorated, and unnecessarily high-order vibrations are increased.

The present invention is intended to solve the above-mentioned problems, and it is possible to suppress the sticking of the mass member to the elastic member when the pressure in the air chamber fluctuates, and to obtain an appropriate vibration suppressing effect. An object of the present invention is to provide a vibration type vibration device.

[0005]

In order to achieve the above-mentioned object, a structural feature of the invention according to claim 1 is that a pair of support portions vertically spaced apart from each other, and a pair of support portions. An attachment member that is attached to the vibration control target, and a mass member that is disposed between the pair of support portions; and a elastic connection between the mass member and the pair of support portions. A vibration damper comprising a pair of upper and lower elastic body connecting portions to be connected, and a pair of upper and lower air chambers formed in a sealed state between a pair of supporting portions and a mass member, and connected to the pair of air chambers, respectively. And a pair of upper and lower air flow passages that can be connected to two air pressure sources having different air pressures for each air chamber and a pair of air flow passages, respectively. A pair of top and bottom that alternately switches the communication state of two air pressure sources And electromagnetic switch means, by respectively different first control pulse signal and the second control pulse signal which is determined on the basis of the reference frequency component of the vibration to be controlled,
Switching control means for causing a pressure change inside the upper and lower air chambers by controlling the switching operation of the corresponding upper and lower electromagnetic switching means, and based on the pressure change inside the upper and lower air chambers. The purpose is to actively suppress the vibration of the controlled object by exerting a relative displacement force on the mass member with respect to the mounting member in the vertical direction.

According to the invention of claim 1, which is configured as described above, different first and second control pulses determined based on the reference frequency component of the vibration to be damped under the control of the switching control means. The switching operation of each electromagnetic switching unit corresponding to the upper and lower air chambers is performed by the signal.
As a result, in each of the air flow passages, the communication state between the upper and lower air chambers of the two air pressure sources having different air pressures is alternately switched, and the pressure states of the upper and lower air chambers change from each other. Therefore, the mass member sandwiched between the upper and lower air chambers is in a state of being pulled upward or downward from either air chamber side. As a result, it is possible to reliably suppress the attachment of the mass member to the upper and lower elastic body connecting portions, and to suppress the occurrence of higher-order components in the vibration control characteristics of the pneumatic vibrator that accompany it.

[0007] Further, the constitutional feature of the invention according to claim 2 is that in the pneumatic vibration device according to claim 1, the first and second control pulse signals have the same frequency component as the reference frequency component. , And each phase is different. A different aspect of the first and second control pulse signals is that they have the same frequency component as the reference frequency component but have different phases. By controlling the switching of the electromagnetic switching means by using the first and second control pulse signals having such different phases, the pressure states of the upper and lower air chambers can be changed alternately. The mass member sandwiched between the lower air chambers is in a state of being pulled upward or downward from either air chamber side. As a result, it is possible to reliably suppress the attachment of the mass member to the upper and lower elastic body connecting portions, and to suppress the occurrence of higher-order components in the vibration control characteristics of the pneumatic vibrator that accompany it.

Further, the structural feature of the invention according to claim 3 is that, in the pneumatic type vibration exciter according to claim 2, the phase of each of the first and second control pulse signals is 1
There is a difference of 80 °. As a result, the same effect as in claim 2 is obtained, and since the phases of the first and second control pulse signals are 180 ° different from each other, the first and second control pulse signals have a symmetric waveform. Formation is facilitated.

Further, the constructional feature of the invention according to claim 4 is that, in the pneumatic vibratory device according to claim 1, one of the first and second control pulse signals has the same frequency as the reference frequency component. It has a component and the other has a higher order frequency component relative to the reference frequency component. As a different mode of the first and second control pulse signals, the frequency component of one of the control pulse signals is the same as the reference frequency component, and the frequency component of the other control pulse signal is the higher frequency component of the fundamental frequency component. It was done. By using such first and second control pulse signals having different frequency components, it is possible to reliably suppress the attachment of the mass member to the pair of upper and lower elastic body connecting portions as described above, and further to further suppress a plurality of Vibrations having frequency components can be suppressed and controlled.

Further, the constitutional feature of the invention according to claim 5 is that, in the pneumatic vibratory device according to claim 4, the first control pulse signal has the same frequency component as the reference frequency component, The second control pulse signal has a higher-order frequency component. As described above, by using the second control pulse signal for controlling the pressure state of the lower air chamber as the high-order frequency component, the driving of the mass member can be activated, and the mass member can be connected to the elastic body connecting portion. Sticking can be suppressed more effectively.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an overall configuration of a pneumatic vibration device applied to a vibration control target such as a vehicle body of an automobile to which the first embodiment is applied. This pneumatic vibration device includes a vibration damper 10 and a vibration damper 1
A pair of air flow passages that connect the upper and lower air chambers K1 and K2 to the atmosphere side and the negative pressure source, which are two air pressure sources having different air pressures, and the air that is interposed in each air flow passage. By controlling the switching operation of the upper and lower electromagnetic valves 29 and 34, which are a pair of electromagnetic switching means for switching the communication states of the chambers K1 and K2 to two different air pressure sources, and the upper and lower electromagnetic valves 29 and 34, And an electric control device 40, which is a switching control means for generating an exciting force by changing the air pressure in the air chambers K1, K2.

The vibration damper 10 includes a mounting member 11 mounted on a vibration control target, and a mass member disposed between upper and lower support portions 17 and 18 arranged on the upper plate and the lower plate of the mounting member 11, respectively. 19 and upper and lower elastic body connecting portions 21 and 23 that elastically connect the upper and lower supporting portions 17 and 18 and the mass member 19, respectively.
8 and the mass member 19 between the upper and lower elastic body connecting portions 21,
A pair of upper and lower air chambers K1, which are enclosed and surrounded by 23
It forms K2.

The mounting member 11 has a rectangular frame type connecting frame portion 12 made of a metal plate which is a connecting portion. The connection frame portion 12 includes an upper plate 13, a lower plate 14, and a pair of side plates 15, 15.
The upper plate 13 and the lower plate 14 are surrounded by the mounting holes 13a and 14a. A cylindrical upper support portion 17 is fixed to the lower surface side of the upper plate 13 by welding or the like and protrudes downwardly around the mounting hole 13a, and a port 17a is attached to a through hole of the upper support portion 17. ing. Also,
A cylindrical lower support portion 18 is fixed to the upper surface of the lower plate 14 by welding or the like and protrudes upward around the mounting hole 14a. A port 18a is attached to a through hole of the lower support portion 18. ing. A mass member 19, which is a disc-shaped metal fitting, is coaxially arranged at an intermediate position between the upper support 17 and the lower support 18. The upper and lower surfaces of the mass member 19 are concave surfaces that are recessed from the peripheral edge toward the axial center.

The upper elastic body connecting portion 21 is a ring-shaped plate made of a rubber elastic body, and its inner peripheral edge and outer peripheral edge are located at the outer peripheral edge of the upper supporting portion 17 and the outer peripheral edge of the upper surface of the mass member 19, respectively. The upper support 17 and the mass member 1 are fixed along the circumference.
9 are elastically connected. More specifically, the upper elastic body connecting portion 21 is fixed to the upper supporting portion 17 on the inner peripheral side and to the ring-like connecting metal fitting 22 on the outer peripheral edge by vulcanization adhesion, and the connecting metal fitting 22 is further welded to the mass member. 19
It is fixed in an airtight state. The lower elastic body connecting portion 23 is also
Similar to the upper elastic body connecting portion 21, it is a ring-shaped plate made of a rubber elastic body, and its inner peripheral edge and outer peripheral edge are respectively lower support portions 18.
Is fixed to the outer peripheral edge and the outer peripheral edge of the lower surface of the mass member 19 along the entire circumference, and elastically connects between the lower support portion 18 and the mass member 19. Specifically, the lower elastic body connecting portion 23 has a lower support portion 18 on the inner peripheral side and a ring-shaped connecting metal fitting 2 on the outer peripheral edge.
4 are fixed by vulcanization adhesion, and the connecting metal fittings 24 are fixed to the mass member 19 in an airtight state by welding or the like. As a result, the upper air chamber K1 is provided between the upper support portion 17 and the upper surface of the mass member 19 by the upper elastic body connecting portion 2
1 is formed in an airtight state by being covered with 1, and the lower support portion 18
A lower air chamber K2 is covered between the lower elastic body connecting portion 23 and is formed in an airtight state between the lower air chamber K2 and the lower surface of the mass member 19.

When the vibration damper 10 is attached to the vibration control target portion, as shown in FIG. 1, the upper air circulation pipe 26 is connected to the port 17a of the upper support 17 and extended at one end thereof. Has been done. The other end of the upper airflow pipe 26 is connected to one port of a three-port type upper electromagnetic valve 29 which is an electromagnetic switching unit. Upper solenoid valve 29
An atmosphere side pipe 27 and a negative pressure side pipe 28 are branched and extended from the other two ports. The upper air flow pipe 26, the atmosphere side pipe 27, and the negative pressure side pipe 28 form an upper air flow passage. A lower air circulation pipe 31 is connected to one end of the port 18a of the lower support portion 18 and extends therefrom. The other end of the lower air circulation pipe 31 is connected to one port of a three-port type lower electromagnetic valve 34. Lower solenoid valve 34
An atmosphere side pipe 32 and a negative pressure side pipe 33 are branched and extended from the other two ports. The lower air flow pipe 31, the atmosphere side pipe 32, and the negative pressure side pipe 33 form a lower air flow passage. The atmosphere side pipes 27 and 32 communicate with the atmosphere, and the negative pressure side pipes 28 and 33 are connected to a negative pressure source 35 such as an intake system of the engine.

This vibration damper 10 includes upper and lower electromagnetic valves 2
The upper and lower air chambers K1 and K2 are not energized when
The inside communicates with the atmosphere side through the upper and lower air circulation pipes 26 and 31, and the atmosphere side pipes 27 and 32, and the mass member 19 is located at the steady position. Electromagnetic valve 29, 34
By energizing either of the above, the air in the corresponding upper and lower air chambers K1 and K2 is moved to the upper and lower air circulation pipes 2.
6, 31 and the negative pressure side pipes 28, 33 are sucked to bring the insides of the air chambers K1, K2 into a negative pressure state, and as a result, the mass member 19 is pulled upward or downward.
In this way, the mass member 19 vibrates in the vertical direction by repeating non-energization / energization of the upper and lower electromagnetic valves 29 and 34, and the vibration control target is vibrated by the vibration. It should be noted that the two air pressure sources are not limited to the negative pressure source and the atmosphere side, and a combination of a positive pressure source and the atmosphere side, a negative pressure source and a positive pressure source, and the like are also possible.

The electric control unit 40, as shown in FIG.
The control unit 41 includes a microcomputer and the like, and first and second drive units 44 and 45. Control unit 41
Includes an adaptive control unit 42 and a pulse signal generation unit 43, and executes an “excitation control program” (not shown). The adaptive control unit 42 performs adaptive control based on an input pulse signal having a frequency corresponding to a vibration frequency of a vibration source such as a rotation pulse signal of a rotation speed sensor (not shown) provided in the engine and an error signal described later. Then, the amplitude and phase of the input signal are compensated by the filter coefficient of the digital filter, and the sine wave output signal updated by the amplitude a and the phase φ data is output to the pulse signal generator 43. Here, as the adaptive control, for example, there is a method using a delay harmonic synthesizer least mean square filter (DXHS-LMS filter), adaptive least mean square filter (Filtered-XLMS), or the like.

According to the adaptive control method using the DXHS-LMS filter, the input pulse signal input from the rotation sensor of the vibration source is processed by the frequency determination unit to calculate the reference frequency (control frequency). , A sine wave input signal related to the reference frequency is output to the adaptive filter. Further, based on the error signal input from the pickup acceleration sensor or the like provided at the vibration control position and the estimated transfer function of the controlled system, which is an estimated value, a digital filter (DX
Amplitude compensation and phase compensation are performed by the filter coefficient of the HS-LMS filter), and the amplitude a and phase φ of the input signal are updated in the adaptive filter as a result. The sine wave output signal based on the updated amplitude a and phase φ data is processed by the transfer function of the controlled system, and the error signal is obtained by adding the output and the vibration external force. By repeating this control, an appropriate output signal can be obtained.

The pulse signal generator 43 maps conversion data representing the relationship in which the amplitude of the output signal is converted into the duty ratio of the pulse signal and stores it in the storage unit. The pulse signal generation unit 43 selects duty ratio data from the storage unit based on the amplitude of the sine wave output signal updated by the adaptive control unit 42 by adaptive control, and determines the reference frequency of the input pulse signal and the selected duty ratio. The control pulse signal provided is generated. The control pulse signal is formed, for example, by half-wave rectifying the sine wave output signal and clipping the rectified signal according to the duty ratio. _By delaying by ₀ , the first control pulse signal C1 is formed. By delaying the first control pulse signal C1, the second phase pulse is further delayed by 180 ° ± θ.
The control pulse signal C2 is formed. The first control pulse signal C1 is output from the first output terminal, and the second control pulse signal C2 is output from the second output terminal.

The first output terminal side of the pulse signal generating section 43 is connected to the first driving section 44, and the first driving section 44 is further connected to the upper electromagnetic valve 29. Second
The output terminal side is connected to the second drive unit 45, and the second drive unit 45 is further connected to the lower electromagnetic valve 34. The first and second drive units 44 and 45 perform switching operations according to inputs of the first control pulse signal C1 and the second control pulse signal C2, respectively, and the solenoids of the upper and lower electromagnetic valves 29 and 34 are output by the output signals. Is designed to drive.

In the first embodiment configured as described above, the first and second controls having different phases determined based on the reference frequency component of the vibration to be suppressed based on the control of the electric control unit 40. Switching operations of the upper and lower electromagnetic valves 29 and 34 are performed by the pulse signals C1 and C2. As a result, the communication states of the atmosphere side and the negative pressure source 35 side having different air pressures to the upper and lower air chambers K1 and K2 are alternately switched, and the pressure states of the upper and lower air chambers K1 and K2 change from each other. Therefore, the mass member 19 sandwiched between the upper and lower air chambers K1 and K2 is in a state of being alternately pulled upward or downward from either side of the air chambers. Therefore, attachment of the mass member 19 to the pair of upper and lower elastic body connecting portions 21 and 23 can be reliably suppressed. As a result, it is possible to suppress the generation of unnecessary higher-order components in the vibration control characteristic (driving output) of the pneumatic control device that is caused by the attachment of the mass member 19 to the elastic body connecting portions 21 and 23.

Next, a concrete example of the first embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 shows a frequency component (first-order component (reference frequency component), second-order component of the drive output of the vibration damper 10 when the phase difference between the first control pulse signal C1 and the second control pulse signal C2 is 180 °. And a third-order component) is a graph showing a relationship of data. This graph and
Comparing the drive output results for the vibration damper shown in the conventional example shown in FIG. 8, both the driving second-order component and the third-order component are lower in the embodiment, and the reduction effect is particularly large in the low frequency range. Has become.

Further, FIG. 4 shows the frequency components (first-order component, second-order component, and second-order component) of the drive output of the vibration damper 10 when the phase difference between the first control pulse signal C1 and the second control pulse signal C2 is 140 °. It is a graph which shows the relation of 3rd order component) data. Comparing this graph with the result of the conventional example shown in FIG.
Both the second-order component and the third-order component are significantly lower in the embodiment, and further, the driving second-order component and the third-order component are significantly reduced as compared with the case where the phase difference shown in FIG. 4 is 180 °. . That is, when the phase difference between the first control pulse signal C1 and the second control pulse signal C2 is asymmetrical compared to 180 ° where both signals are symmetrical, the effect of reducing the higher-order drive output may be greater. It became clear. However, regarding the generation of the control pulse signal, the symmetrical waveform is easier to generate.

Next, the second embodiment will be described.
In the second embodiment, the controlled object vibration is not limited to the primary frequency component as in the first embodiment, but the primary and secondary vibrations are
The control is performed when the following frequency components are included.
That is, regarding the first and second control pulse signals D1 and D2 that control the switching operation of the upper and lower electromagnetic valves 29 and 34, as shown in FIG. 6, the first control pulse signal D1 has the same frequency component as the reference frequency component. The second control pulse signal D2 is a secondary frequency component with respect to the reference frequency component.

The control unit 5 of the electric control unit 50 of this embodiment
As shown in FIG. 5, reference numeral 1 denotes an adaptive control unit 52 and first and second pulse signal generation units 5 connected in parallel to the output side thereof.
3, 54 are provided. The adaptive control unit 52 divides a primary frequency component included in the input pulse signal and a secondary frequency component having a frequency twice that of the primary frequency component, performs adaptive control on each of them, and updates the sine wave signal of the primary frequency component. And a sine wave signal having a secondary frequency component are output to the first and second pulse signal generation units 53 and 54, respectively. The first pulse signal generation unit 46 has the same configuration as the pulse signal generation unit 43 shown in the first embodiment, and has the first frequency component and the first control pulse delayed by the control phase θ1 from the input pulse signal. The signal D1 is output to the first driver 44. The second pulse signal generation unit 47 processes the input sine wave signal of the secondary frequency component and outputs the second control pulse signal D2 that is the secondary frequency component and is delayed by the control phase θ2 from the input pulse signal. It outputs to the second drive unit 45, and the basic configuration is the same as that of the first pulse signal generation unit 44.

By using the first control pulse signal D1 and the second control pulse signal D2 having different frequency components, the control target vibrations having a plurality of frequency components are suppressed and controlled by the respective control pulse signals D1 and D2. be able to. In addition, the first control pulse signal D1 and the second control pulse signal D1
By alternately changing the pressure states of the corresponding upper and lower air chambers K1 and K2 by the control pulse signal D2,
Adhesion to the upper and lower elastic body connecting portions 21 and 23 of the mass member 19 can be reliably suppressed. In particular, by making the second control pulse signal for controlling the pressure state of the lower air chamber K2 the secondary frequency component, the driving of the mass member 19 can be activated, and the upper and lower elastic members of the mass member 19 can be activated. Connection part 2
It is possible to more effectively suppress the sticking to the Nos. 1 and 23.

Next, a concrete example of the second embodiment will be described. When the controlled object includes the reference frequency component and the secondary frequency component, the first control pulse signal can suppress the vibration of the reference frequency component as shown in FIG. Depending on the signal,
As shown in (b), the vibration of the secondary frequency component can be suppressed.

In each of the above embodiments, the adaptive control system is used to form the first and second control pulse signals whose amplitude and phase are updated based on the input pulse signal. It is not limited to this. For example, according to the frequency of the input pulse signal, amplitude and phase data updated in advance by adaptive control is acquired and stored in the form of a data map. Using the storage medium storing this data map, the control means reads out appropriate amplitude and phase data from the storage medium according to the input of the input pulse signal and the state signal by the control means, and the first and the first corresponding data are read. Two control pulse signals may be formed. Further, the formation of the amplitude and phase data does not necessarily need to use the adaptive control method, and can be experimentally acquired by using various measuring means. Other,
What is shown in the above embodiment is an example, and various modifications can be made without departing from the gist of the present invention.

[0029]

According to the first aspect of the present invention, the pressure of the corresponding upper and lower air chambers is changed by performing the switching operation of the pair of electromagnetic switching means by the first and second control pulse signals different from each other. The states change from each other, so that the mass member sandwiched between the upper and lower air chambers is alternately pulled up and down from one of the air chamber sides, and the mass member upper and lower elastic body connecting portions are connected to each other. Sticking is surely suppressed.
As a result, it is possible to suppress the generation of higher-order components in the vibration control characteristics of the pneumatic vibration device that accompanies the attachment of the mass member, and it is possible to suppress unnecessary higher-order vibration.

The first and second control signals may have different phases, so that the same effect as the invention of claim 1 can be obtained. Further, when the phases of the both are different by 180 °, the two control signals are symmetrical and thus the signals can be easily formed (the effects of the inventions of claims 2 and 3). Further, the first and second control signals may have different frequency components, and in this case, vibration inputs of a plurality of frequency components can be controlled respectively. Further, in terms of suppressing attachment of the mass member to the elastic body connecting portion, it is particularly preferable to increase the frequency component of the second control pulse signal for controlling the lower air chamber (the invention of claims 4 and 5). effect).

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a pneumatic vibration device according to a first embodiment of the present invention.

FIG. 2 is a graph showing a relationship between first and second control pulse signals and an input pulse signal in the first embodiment.

FIG. 3 is a relationship between the primary component, secondary component, and tertiary component data of the drive output of the pneumatic vibrator when the phase difference between the first and second control pulse signals is 180 ° in the first embodiment. It is a graph which shows.

FIG. 4 is a relationship between the first-order component, second-order component, and third-order component data of the drive output of the pneumatic vibrator when the phase difference between the first and second control pulse signals is 140 ° in the first embodiment. It is a graph which shows.

FIG. 5 is a block diagram showing a schematic configuration of an electric control device of a pneumatic vibrator according to a second embodiment.

FIG. 6 is a diagram showing a first example of different frequency components in the second embodiment.
3 is a graph showing a relationship between a second control pulse signal and an input pulse signal.

FIG. 7 is a graph showing the data of the drive output primary component and the data of the drive output secondary component of the pneumatic vibrator when the first and second control pulse signals are on and off in the second embodiment. Is.

FIG. 8 is a graph showing the relationship among the first-order component, second-order component, and third-order component data of the drive output of the conventional pneumatic vibrator.

[Explanation of symbols]

10 ... Vibration suppressor, 11 ... Mounting member, 12 ... Connection frame part, 17
... Upper support part, 17a ... Port, 18 ... Lower support part, 18a
... port, 19 ... mass member, 21 ... upper elastic body connecting portion, 2
3 ... Lower elastic body connecting portion, 26 ... Upper air circulation pipe, 27 ...
Atmosphere side pipe, 28 ... Negative pressure side pipe, 29 ... Upper electromagnetic valve, 31 ... Lower air circulation pipe, 32 ... Atmosphere side pipe, 3
3 ... Negative pressure side pipe, 34 ... Upper electromagnetic valve, 35 ... Negative pressure source, 40 ... Electric control device, 41 ... Control part, 42 ... Adaptive control part, 43 ... Pulse signal generation part, 44 ... First drive part, 4
5 ... 2nd drive part, 50 ... Electric control device, 51 ... Control part,
52 ... Adaptive control unit, 53 ... First pulse signal generation unit, 54
The second pulse signal generator.

Claims (5)

[Claims] 1. A mounting member, which has a pair of support portions arranged vertically apart from each other and a coupling portion that couples the pair of support portions, and is attached to a vibration control target; and the pair of support portions. A mass member disposed between the parts, a pair of upper and lower elastic body connecting parts that elastically connect the mass member and the pair of supporting parts, respectively, and the pair of supporting parts and the mass member. A vibration damper having a pair of upper and lower air chambers formed in a hermetically sealed state, and connectable to two air pressure sources respectively connected to the pair of air chambers and having different air pressures in the respective air chambers A pair of upper and lower air flow passages, and a pair of upper and lower electromagnetic types that are respectively interposed in the pair of air flow passages and that alternately switch the communication states of the two air pressure sources to the upper and lower air chambers, respectively. Switching means and the reference frequency component of the vibration to be controlled The pressure in the upper and lower air chambers is controlled by controlling the switching operation of the corresponding upper and lower electromagnetic switching means by the different first control pulse signal and second control pulse signal determined based on the minutes. A switching control means for causing a change, and based on a pressure change inside the upper and lower air chambers, a relative displacement force is exerted on the mass member in the vertical direction with respect to the mounting member to vibrate the controlled object. Pneumatic vibrating device that actively suppresses 2. The pneumatic vibration generator according to claim 1, wherein the first and second control pulse signals have the same frequency component as the reference frequency component and have different phases. apparatus. 3. The pneumatic exciter according to claim 2, wherein the phases of the first and second control pulse signals are different by 180 °. 4. The one of the first and second control pulse signals has the same frequency component as the reference frequency component, and the other has a higher-order frequency component with respect to the reference frequency component. Item 2. The pneumatic vibrator according to Item 1. 5. The method according to claim 4, wherein the first control pulse signal has the same frequency component as the reference frequency component, and the second control pulse signal has a higher frequency component. Pneumatic vibrator.