JP3207668B2 - Anti-vibration support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration support device for a device which receives a large impact force, such as a device for traveling on a bad road or an underwater device dropped from the air.

[0002]

2. Description of the Related Art FIG. 10 is a conceptual diagram showing an example of a conventional anti-vibration support device. In this example, an anti-vibration rubber (3) is provided between the structure (1) and a device (2) incorporated in the structure (1).
Insert the vibration G ₁ of the structure is less likely to be transmitted to the device (2).

[0003]

In the above-mentioned conventional anti-vibration support device, when a large impact acceleration acts on the structure (1) (for example, when it is dropped from the air and lands on the sea surface),
Since the relative displacement between the structure (1) and the device (2) becomes extremely large, the displacement exceeds the allowable displacement of the vibration isolating rubber (3), and the vibration isolating rubber (3) is damaged, or the structure ( 1)
The device (2) may collide with the device (2), and the device (2) may be damaged. Further, when close to the natural frequency omega _n is the resonance occurs equipment frequency omega of the vibration acceleration G ₁ of the structure (1) is determined by the device (2) and rubber cushion (3) (2) vibration acceleration G ₂ is very large as shown in FIG. 11, also the function of the device (2) is impaired.

The present invention is directed to an apparatus for supporting a device built in a structure by the structure, even if a large acceleration is applied to the structure, damages due to excessive deformation of the vibration isolating rubber, or damage to the structure and the device. It is an object of the present invention to prevent damage to equipment due to a collision and to avoid resonance of equipment due to vibration acceleration of a structure.

[0005]

In order to achieve the above object, the present inventor proposes the following [1] and [2 ] anti-vibration support devices.

[1] An apparatus for supporting a device built in a structure by vibration isolation using the structure, wherein the device is attached to one of the device and the structure, and has rigidity with a change in spring height. A variable nonlinear spring, a shape memory alloy wire that is delivered between the other and the nonlinear spring, and whose length is reduced by heating to become an actuator that adjusts the height of the nonlinear spring; and that a current is applied to the shape memory alloy wire. An anti-vibration support device comprising: a flowing unit; and a switch for turning on and off the current.

[2] An apparatus for supporting a device incorporated in a structure with vibration isolation by the structure, wherein the device is attached to one of the device and the structure and has rigidity in accordance with a change in spring height. A non-linear spring that changes, a spring provided between the other and the non-linear spring and a shape memory alloy wire whose length is reduced by heating, a unit for passing a current through the shape memory alloy wire, the device and the structure A vibration meter for detecting a vibration acceleration and a vibration frequency of the vehicle, and a control device for adjusting a current supply time based on the vibration acceleration level and the vibration frequency detected by the vibration meter. Support device.

[0008]

[0009]

In the present invention, a non-linear spring whose rigidity changes with a change in the height of the spring is disposed between the structure and the device built in and supported by the structure. By changing, the support rigidity of the device can be changed. Therefore, at normal times, the rigidity of supporting the device by the non-linear spring is reduced so that the vibration of the structure is hardly transmitted to the device, and the device is prevented from being damaged by the vibration. When a large impact acceleration acts on the structure, collision between the structure and the device is prevented by increasing the rigidity of the nonlinear spring, that is, increasing the support rigidity of the device. When the frequency of the vibration acceleration of the structure approaches the natural frequency determined by the device and the nonlinear spring, etc., the resonance frequency is changed by changing the natural frequency of the system by changing the rigidity of the nonlinear spring. Work around.

As means for changing the height of the non-linear spring, in the above means [1] and [2], a shape memory alloy wire is disposed between the non-linear spring and the structure or device, and the shape memory Means for passing a current through the alloy wire is provided, and by turning on and off the current, the shape memory alloy wire is heated or cooled to change its length, and the tension is applied to the nonlinear spring. Further, in the solution [2], not only a shape memory alloy wire but also a spring is provided between the non-linear spring and the structure or the device, and the vibration acceleration and the vibration frequency of the device and the structure are detected by a vibrometer. Since the control device adjusts the current supply time based on the detected value, the tension of the shape memory alloy wire and the restoring force of the spring are adjusted so that the spring height is obtained such that the nonlinear spring has appropriate rigidity. Can be automatically balanced.

[0011]

[0012]

【Example】

[First Embodiment] FIGS. 1 and 2 are conceptual diagrams showing a first embodiment of the present invention. FIG. 1 shows a current-off state, and FIG. 2 shows a current-on state. The device (2) incorporated in the structure (1) and the structure (1) are connected to each other via a vibration-proof rubber (3). In the present embodiment, one of the device (2) and the structure (1) (the device (2) in the illustrated example)
Next, a non-linear spring (4) whose rigidity changes with a change in spring height is mounted in a direction having rigidity in the vertical direction. Further, a shape memory alloy wire (5) is arranged between the other (structure (1) in the illustrated example) and the above-mentioned nonlinear spring (4), and both ends of the shape memory alloy wire (5) are connected to the nonlinear spring (4). ) And the structure (1). The shape memory alloy wire (5) is provided with an electric wire (6) for passing a current through it, a power supply (7), and a switch (8) for turning on / off the current. The length of the shape memory alloy wire (5) at the time of shape memory is such that the spring height h of the non-linear spring (4) when the power is turned on is an appropriate value (so that the non-linear spring (4) has an appropriate vertical rigidity). Value)
Adjust so that

FIG. 3 is a diagram showing the restoring stress of the shape memory alloy wire. When a tensile force is applied to the shape memory alloy wire,
When the temperature is low, strain (elongation) can be easily applied. However, when the temperature of the wire increases under strain, the wire shrinks to return to its original shape. Since the shape memory alloy wire has electric resistance, the temperature can be increased by flowing an electric current.

In addition, by increasing the height of the non-linear spring, the spring constant in the longitudinal direction can be increased as shown in FIG. FIG. 5 is a diagram illustrating an example of the shape of the nonlinear spring. Changing the “height” in this figure changes the rigidity in the “length” direction. Therefore, as shown in FIG. 6, the nonlinear spring (4) is attached to the device (2) so that the "length" direction is vertical, and the shape memory alloy (5)
If the "height" is changed by the restoring force of the structure, the structure (1)
Of the device (2) in the vertical direction can be changed. That is, in the structure shown in FIG. 1, when a current is applied to the shape memory alloy wire (5), the shape memory alloy wire (5) shrinks as shown in FIG. 2, and the spring height h of the nonlinear spring (4) increases. Therefore, the vertical support of the device (2) becomes rigid. When the current is turned off, the temperature of the shape memory alloy wire (5) decreases and the tension of the wire disappears, and the spring height h of the nonlinear spring (4) returns to the state shown in FIG. 1 again, and the device (2) Also returns to the value in the state of FIG.

Therefore, when the structure (1) collides with the sea surface, the current is turned on to increase the rigidity of the nonlinear spring (4) in the vertical direction, that is, by increasing the supporting rigidity of the device (2), thereby preventing the structure. Excessive deformation of the vibration rubber (3) and collision between the structure (1) and the device (2) are prevented. During normal operation, to reduce the support effect of the device (2) by non-linear spring (4) by turning off the current, vibration G ₁ of the structure (1) is transmitted to the device (2) by anti-vibration rubber (3) To prevent damage to the device (2) due to vibration. Also, the frequency ω of the vibration acceleration G ₁ of the structure (1) is
When resonance occurs due to the natural frequency ω _n determined by the vibration control rubber (3) and the vibration isolating rubber (3), the rigidity of the nonlinear spring (4) acts by turning on the current.
And the natural frequency determined by the anti-vibration rubber (3) changes, and resonance can be avoided.

[Second Embodiment] FIG. 7 is a conceptual diagram showing a second embodiment of the present invention. In this embodiment, the device (2) is connected to the structure (1) via the vibration-proof rubber (3) and the linear guide (9) for restraining displacement other than the vertical direction. A nonlinear spring (4) whose rigidity changes with a change in spring height is attached to the device (2) in a direction having rigidity in the vertical direction. A shape memory alloy wire (5) and a spring (10) are arranged between the nonlinear spring (4) and the structure (1), and both ends of the shape memory alloy wire (5) are connected to the nonlinear spring (4) and the structure (1). Stick to 1). The shape memory alloy wire (5) is provided with an electric wire (6) and a power source (7) for supplying a current to the wire. The spring height h of the nonlinear spring (4) (that is, the supporting rigidity of the device) is monitored by the non-contact displacement meter (11). Vibrometers (12a) and (12b) are installed to monitor the vibration acceleration and frequency of the structure (1) and the equipment (2).

As described above, when a tensile force is applied to a shape memory alloy wire, strain (elongation) is easily caused at a low temperature.
However, when the temperature of the wire increases in the stretched state, the wire shrinks in an attempt to return to its original shape. In addition, by increasing the height of the non-linear spring, the spring constant in the longitudinal direction can be increased. In this embodiment, a spring (10) and a shape memory alloy wire (5) are installed between the structure (1) and the non-linear spring (4), and the restoring force of the shape memory alloy wire (5) against the spring force is adjusted. By doing
It changes the support rigidity.

That is, in the structure shown in FIG. 7, if a current is applied to the shape memory alloy wire (5) so that the tension of the shape memory alloy wire exceeds the restoring force of the spring (10), the nonlinear spring (4) Since the spring height h of the device (2) increases, the vertical support of the device (2) becomes rigid. When the current is turned off, the temperature of the shape memory alloy wire (5) decreases and the tension of the wire disappears, and the spring height (h) of the nonlinear spring (4) returns to the original height by the action of the spring (10). The vertical support rigidity of the device (2) is reduced. Further, the shape memory alloy wire (5) passing a pulsed current as shown in FIG. 8, when the time of current on
The ratio between the time during which the shape memory alloy wire (5) has the shape memory effect and the time during which distortion can be easily applied can be changed by adjusting the ratio between the interval and the power supply cycle (duty ratio). In the present embodiment, the control device (14) adjusts the duty ratio of the power supply (7) so that the spring height h such that the nonlinear spring (4) has appropriate rigidity in the vertical direction can be obtained. The balance between the tension of the shape memory wire (5) and the restoring force of the spring (10) can be achieved.

Here, the vibrometer installed on the structure (1)
By monitoring the vibration acceleration in (12a), allowing determination of the support rigidity in accordance with the frequency ω of the vibration acceleration G ₁ of the structure (1). Further, by monitoring the vibration acceleration with the vibrometer (12b) installed in the device (2), the change in the response acceleration can be fed back to the support rigidity determination routine. That is, in the arithmetic unit (13), based on the output of the non-contact displacement meter (11), the spring height h of the non-linear spring (4), the rigidity of the non-linear spring (4), the device (2) and the supporting device (anti-vibration rubber) The natural frequency of the system consisting of (3) and the nonlinear spring (4) is calculated. Further, the vibration acceleration levels and output frequencies of the structure (1) and the device (2) are calculated from the outputs of the vibrometers (12a) and (12b). Then, the support rigidity that can prevent resonance and excessive displacement is calculated, the duty ratio is determined, and an appropriate signal is output to the control device (14) that drives the power supply (7).

As described above, in this embodiment, the structure (1)
Vibration damping rubbers acceleration G ₁ in the frequency omega is a device (2) (3), the natural frequency omega _n determined by non-linear spring (4)
In the case where resonance occurs close to the above, resonance can be avoided by changing the natural frequency of the system by changing the rigidity of the nonlinear spring (4). During normal operation, the spring height h of the non-linear spring (4) is reduced, the effect of supporting the device (2) by the non-linear spring (4) is reduced, and the structure (1) is damped by the anti-vibration rubber (3). vibration G ₁ is equipment device due to vibration and hardly transmitted to the (2) (2)
Damage can be prevented. Further, when a large impact acceleration acts on the structure (1) (such as when it collides with the sea surface), the height h of the nonlinear spring (4) is increased, and the vertical height of the nonlinear spring (4) is increased. By increasing the rigidity, that is, by increasing the support rigidity of the device (2), it is possible to prevent excessive deformation of the vibration isolating rubber (3) and collision between the structure (1) and the device (2).

[0021]

[0022]

[0023]

[0024]

According to the first and second aspects of the present invention,
To change the height of the nonlinear spring
As a step, the shape between the nonlinear spring and the structure or equipment
The memory alloy wire is arranged and the shape memory alloy wire is
Provide a means for supplying current to the
By heating or cooling the shape memory alloy wire with
And apply that tension to the non-linear spring,
Further, according to the invention of claim 2, the nonlinear spring and the structure or machine
Provide not only a shape memory alloy wire rod but also a spring between the container and
And the vibration acceleration and vibration frequency of equipment and structures
Detected by a vibrometer and by the control device based on the detected value
A non-linear spring is suitable because the current application time is adjusted
Shape so that a spring height with high rigidity is obtained.
Automatically balances tension of metal wire and spring restoring force
The configuration and its operation
In the present invention, when the frequency of the vibration acceleration of the structure is close to the natural frequency determined by the device and the non-linear spring and the like, and resonance occurs, by changing the rigidity of the non-linear spring, Resonance can be avoided by changing the natural frequency of. During normal operation, the height of the non-linear spring is reduced, the effect of supporting the device by the non-linear spring is reduced, and vibration of the structure is hardly transmitted to the device, thereby preventing damage to the device due to vibration. . Further, when a large impact acceleration acts on the structure, the spring height of the nonlinear spring is increased to increase the rigidity of the nonlinear spring in the vertical direction, that is, by increasing the support rigidity of the device. Deformation and collision between the structure and the device can be prevented.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a state in which a current is turned off according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a current-on state of the first embodiment.

FIG. 3 is a view showing a restoring stress of a shape memory alloy wire rod.

FIG. 4 is a diagram illustrating a relationship between a spring height of a nonlinear spring and a spring constant;

FIG. 5 is a diagram illustrating an example of a shape of a nonlinear spring.

FIG. 6 is a side view showing a mounting state of the non-linear spring in the first embodiment.

FIG. 7 is a conceptual diagram showing a second embodiment of the present invention.

FIG. 8 is a diagram illustrating a duty ratio.

FIG. 9 is a conceptual diagram showing an example of a conventional anti-vibration support device .

FIG. 10 shows a vibration transmission rate from a structure to a device.
To Figure der Ru.

[Explanation of symbols]

(1) Structure (2) Equipment (3) Anti-vibration rubber (4) Non-linear spring (5) Shape memory alloy wire (6) Electric wire (7) Power supply (8) Switch (9) Linear guide (10) Spring (11) ) non-contact displacement meter (12a), (12b) vibrometer (13) processing unit (14) control equipment (h) spring height (G _1), (G ₂₎ vibration acceleration

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16F 7/00 F16F 15/02 F16F 15/06

Claims (2)

(57) [Claims] 1. An apparatus for supporting an apparatus built in a structure by vibration isolation using said structure, wherein said apparatus is attached to one of said apparatus and said structure, and changes in rigidity with a change in spring height. A non-linear spring, a shape memory alloy wire that is delivered between the other and the non-linear spring, and whose length is reduced by heating to become an actuator that adjusts the height of the non-linear spring, and that a current flows through the shape memory alloy wire. Means,
And a switch for turning on and off the current. 2. An apparatus for supporting a device incorporated in a structure by vibration isolation by said structure, wherein said device is attached to one of said device and said structure, and changes in rigidity with a change in spring height. A non-linear spring, a spring provided between the other and the non-linear spring, and a shape memory alloy wire whose length is reduced by heating, a means for flowing an electric current through the shape memory alloy wire, and the device and the structure An antivibration support comprising: a vibrometer for detecting a vibration acceleration and a vibration frequency; and a control device for adjusting a current supply time based on the vibration acceleration level and the vibration frequency detected by the vibration meter. equipment.