JPH06281531A - Electrodynamic oscillation shock generator - Google Patents

Abstract

PURPOSE:To simultaneously achieve ultralarge displacement and high acceleration. CONSTITUTION:Center poles 5 are arranged and main yokes 6 are provided on the upper part and the lower part of the center poles 5. The center poles 5 and the main yokes 6 are connected with side yokes 7. Excitation coils 4 are provided on both ends of the main yokes 6. Cylindrical drive coils 2 are movably engaged with play in the axial direction of the center poles 5 through specified gaps on the outer circumferential face of both the center poles 5. A shaking table 11 for mounting a test product is arranged between both the center poles 5. The shaking table 11 is movably guided in the axial direction of the center poles 5 through a guide mechanism 9. Here the invention is different from the conventional and the shaking table 11 and the drive coils 2 are connected each other through a connection parts 3 fixed on the outer surface of the drive coils 2 without using any drive shaft. Accordingly mass of a movable part 13 can be reduced and required ultralarge displacement and high acceleration can be satisfied simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodynamic vibration and impact generator for reproducing in a laboratory a vibration and an impact environment with large displacement and acceleration, which is represented by an impact environment at the time of collision of an automobile. is there.

[0002]

2. Description of the Related Art As an example showing the original form of this type of conventional technology, for example, there is an electrodynamic vibration and shock generator shown in Japanese Patent Laid-Open No. 55-31466. In this example, possible displacement is ± 50 mm, acceleration is 1000 m / s
It is about ² . As an example showing a conventional technique that can be regarded as being on an extension line of this original shape, there is a large displacement electrodynamic vibration impact generator shown in FIG.

In FIG. 4, the main body 30 is composed of a cylindrical yoke 31 made of a magnetic material, with the outer side serving as a main yoke 32 and the inner side serving as a center pole 34. A portion that bridges the ends of the main yoke 32 and the center pole 34 is defined as a side yoke 33. An armature 36 provided with a driving coil 35 on the outside is provided at the center of the center pole 34.
4 is loosely fitted so as to be movable in the axial direction. Further, inside both sides of the main yoke 32, exciting coils 37 for generating a magnetic field in the yoke 31 are wound. Reference numeral 39 denotes a drive shaft. One end of the drive shaft 39 is connected and fixed to the armature 36, and the other end is integrally formed with a vibrating table 40 on which a sample is placed. The drive shaft 39 is projectable in the axial direction from the main body 30 via the guide roller 38. Note that FIG. 5 is a perspective view of an essential part of the vibrating table 4.
A guide portion 42 is formed on the lower surface of 0, and a guide shaft 41 integrally protruding from the main body 30 is inserted into a hole 43 bored in the guide portion 42. That is, drive shaft 3
9 can be vibrated in the axial direction by the guide of the guide shaft 41 by the driving (vibration) of the armature 36.

[0004]

In such a conventional example, as apparent from FIG. 4, the length of the main yoke 32 in the vibration direction is increased by the required displacement. The distance between the drive coil 35 and the excitation coil 37, or the distance S between the side surface of the main body 30 and the vibrating table 40 is such that the drive shaft 39 projects outward from the main body 30 when the displacement is ± S. In addition, the drive shaft 39 has a length of 2S or more. In this method, the possible shock displacement is ± 250 mm and the shock acceleration is about 1000 m / s ² . By the way, the typical impact displacement of a car body during an automobile collision is 1 to 3 m, and the acceleration is 10 m.
It is from 00 to 2000 m / s ² . In the method of the conventional example shown in FIG. 4, if it is attempted to enable an extremely large displacement of 1 to 3 m,
The length of the drive shaft 39 must be twice the required displacement or more. Moreover, the mass of the drive shaft 39 is inevitably increased, and the target value of acceleration is 1000 to 2000 m /
It is impossible to achieve s ² . If the drive shaft 39 is made thinner, the increase in mass is reduced, but the axial resonance frequency with the drive shaft 39 as a spring and the drive coil 35 and the vibrating table 40 as a mass is reduced, so that a high frequency can be faithfully reproduced. become unable.

In order to increase the exciting force to reach the target values of displacement and acceleration, the diameter of the drive coil 35 must be increased, and the increase in the diameter increases the mass of the drive coil 35 and the armature 36. Therefore, not only is the effect of increasing the ratio of excitation force to mass, that is, acceleration, not very effective, but the resonance frequency of the drive coil 35 and the armature 36 itself decreases, which may cause the target value to be achieved. Can not. Also, it is clear that an increase in size and mass leads to an increase in cost.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to provide an electrodynamic vibration impact generator capable of simultaneously achieving ultra-large displacement and high acceleration. Especially.

[0007]

Therefore, in the electrodynamic vibration shock generator according to the first aspect, the center pole 5 and the main yoke 6 made of a magnetic material are arranged in parallel, and the center pole 5 is provided.
The main yoke 6 is connected to the main yoke 6 by a side yoke 7 made of a magnetic material, the exciting coil 4 for generating a magnetic field is mounted on the main yoke 6, and the drive coil 2 is axially movably mounted on the outer circumference of the center pole 5. The vibrating table 11 on which the sample 11 is loosely fitted and mounted on the drive coil 2 is connected to the center pole 5 via a connecting portion 3 extending substantially orthogonal to the center pole 5.

According to another aspect of the present invention, there is provided the electrodynamic vibration shock generator, wherein two center poles 5 are arranged side by side, drive coils 2 are provided on both center poles 5, and the drive coils 2 and the vibrating table 1 on both sides are respectively arranged. It is characterized in that they are connected via the connecting portion 3.

[0009]

According to the electrokinetic vibration shock generator of the above-mentioned claim 1, the vibrating table 1 is coupled to the drive coil 2 via the connecting portion 3 without using the drive shaft which has been conventionally used. In addition, this device can be downsized by the amount that the conventional drive shaft is projected. Further, the vibrating table 1, the connecting portion 3 and the drive coil 2
It is possible to reduce the mass of the movable part composed of, etc., and it is possible to simultaneously achieve the required ultra-large displacement and high acceleration. Further, since the conventional drive shaft is not used, there is no resonance frequency using the drive shaft as a spring. Therefore, it is possible to faithfully reproduce a high-frequency vibration shock.

According to the electrokinetic vibration shock generator of the second aspect, the two center poles 5 are arranged in parallel, and the drive coils 2 are provided on both center poles 5, respectively. Can be reduced, and the resonance frequency of the drive coil 2 can be increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the electrodynamic vibration impact generator of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross-sectional view from above of the device, and FIG.
Shows a sectional view seen from the front. Furthermore, FIG. 3 shows a sectional view from the side. As shown in FIG. 1, a columnar center pole 5 made of a magnetic material is arranged on both sides of the main body A, and above and below the center pole 5, respectively.
As shown in FIGS. 2 and 3, a main yoke 6 made of a magnetic material is provided through a predetermined gap. As shown in FIG. 3, the end portion of the center pole 5 and the end portions of the upper and lower main yokes 6 are integrally connected by a side yoke 7 made of a magnetic material. Further, as shown in FIGS. 1 and 3, excitation coils 4 for generating magnetic fields are respectively wound around the center pole 5, the main yoke 6 and the side yokes 7 on the inner peripheral surfaces on both sides of the main yoke 6. There is. These center pole 5, main yoke 6, side yoke 7, etc.,
As shown in FIGS. 2 and 3, it is arranged on the pedestal 8. Further, as shown in FIGS. 1 and 2, the center pole 5 is located between the center poles 5 on the upper surface of the pedestal 8.
A guide mechanism 9 is provided in the same direction as the axial direction of, and a guide groove 10 is provided on the upper surface of the guide mechanism 9.

A cylindrical drive coil 2 is provided on the outer peripheral surface of both center poles 5 with a predetermined gap therebetween.
Is movably fitted in the axial direction. The vibrating table 1 on which the sample 11 is placed is arranged between both center poles 5, and the guide portion 12 protruding from the lower surface of the vibrating table 1 is inserted into the guide groove 10 of the guide mechanism 9 to vibrate. The base 1 is guided in the axial direction of the guide mechanism 9 and the center pole 5 via the guide portion 12 and the guide groove 10. Here, unlike the prior art, the present invention does not use the drive shaft (see FIG. 4) 39, and as shown in FIG. 2, the vibration table 1 and the drive coil 2 are fixed to the outer surface of the drive coil 2. It is connected through 3. That is, the both sides of the vibrating table 1 and the drive coils 2 of the left and right center poles 5 form a movable portion 13 which is integrated via the connecting portion 3. The movable portion 13 is normally located at a substantially central portion of the main body A as shown in FIG.

Next, the operation will be described. When a direct current is caused to flow in the exciting coil 4 located outside both ends of the center pole 5 in the direction shown in FIG. 24, a DC magnetic flux is generated in the direction shown in FIG. This magnetic flux acts in a direction orthogonal to the surface of the cylinder of the drive coil 2. Then, when a current corresponding to a necessary vibration shock waveform is passed through the drive coil 2, an exciting force is generated according to Fleming's left-hand rule. When the direction of the current flowing through the drive coil 2 is the direction shown by 21 in FIG. 3, the exciting force F is generated in the direction shown in FIG. When the direction of the current flowing through the drive coil 2 is opposite, the exciting force is generated in the opposite direction. The arrow 22 shown in FIG. 1 indicates the vibration direction. Here, the movable portion 13 including the drive coil 2, the connecting portion 3, the vibrating table 1 and the sample 11 is guided only in the vibration direction by the guide mechanism 9 (see arrow 22 in FIG. 1),
It is designed to be constrained in directions other than the vibration direction.
Further, S shown in FIG. 3 is a vibration (movement) range of the movable portion 13, and since the movable portion 13 is arranged inside the main body A and is freely movably fitted to the center pole 5 inside, the displacement is caused. The movable part can be made small in spite of the large size.

The magnitude of the exciting force F is proportional to the magnitude of the magnetic flux intersecting with the drive coil 2 and the magnitude of the current flowing through the drive coil 2. This exciting force F is transmitted to the vibrating table 1 through the connecting portion 3 fixed to the outer surface of the drive coil 2, and can give a vibration impact to the sample 11 mounted on the vibrating table 1.

Assuming that the total mass of the drive coil 2, the connecting portion 3, the vibrating table 1 and the sample 11 is m and the exciting force is F, the obtained acceleration A is expressed by the following equation. A = F / m

In the present invention, since the vibrating table 1 and the drive coil 2 are connected via the connecting portion 3 fixed to the outer surface of the drive coil 2 without using the drive shaft in the conventional example, the movable portion 13 is connected.
It is possible to reduce the mass of, and it is possible to satisfy the required ultra-large displacement and high acceleration at the same time.

Further, in the present invention, since the two drive coils 2 arranged in parallel are used in order to obtain a constant exciting force, the diameter of the drive coil 2 can be reduced, and the drive coil can be made smaller. The resonance frequency of 2 can be increased.

Since the drive shaft used conventionally is not used, there is no resonance frequency with the drive shaft as a spring. Therefore, it is possible to faithfully reproduce a high-frequency vibration shock.

The current flowing through the drive coil 2 is obtained by a power amplifier (not shown). The input signal to the power amplifier is obtained by the method described in, for example, Japanese Patent Application Laid-Open No. 2-184906 filed by the present applicant.

[0020]

As described above, according to the electrodynamic vibration impact generator of claim 1, the vibrating table is connected to the drive coil through the connecting portion without using the drive shaft which has been conventionally used. Therefore, the present device can be downsized by the amount that the conventional drive shaft is projected. Further, it is possible to reduce the mass of the movable portion including the vibration table, the connecting portion, the drive coil, and the like, and it is possible to simultaneously achieve the required ultra-large displacement and high acceleration. Furthermore, since the conventional drive shaft is not used,
There is no resonance frequency with the drive shaft as a spring. Therefore, it is possible to faithfully reproduce a high-frequency vibration shock.

According to the electrokinetic vibration shock generator of the present invention, two center poles are provided side by side, and drive coils are provided on both center poles, thereby reducing the diameter of the drive coil. Therefore, the resonance frequency of the drive coil can be increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electrokinetic vibration shock generator according to an embodiment of the present invention as viewed from above.

FIG. 2 is a cross-sectional view of an electrodynamic vibration and impact generator according to an embodiment of the present invention as seen from the front.

FIG. 3 is a cross-sectional view of an electrodynamic vibration and impact generator according to an embodiment of the present invention as seen from a side surface.

FIG. 4 is a cross-sectional view of a conventional electrodynamic vibration impact generator.

FIG. 5 is a perspective view of a main part of a conventional example.

[Explanation of symbols]

 1 Shaking Table 2 Drive Coil 3 Connection Part 4 Excitation Coil 5 Center Pole 6 Main Yoke 7 Side Yoke 9 Guide Mechanism 11 Sample Product 13 Moving Part A Main Body

Claims (2)

[Claims] 1. A center pole (5) made of magnetic material and a main yoke (6) are arranged in parallel, and a side yoke (7) made of magnetic material is provided between the center pole (5) and the main yoke (6). The main yoke (6) is fitted with an exciting coil (4) for generating a magnetic field, and the drive coil (2) is loosely fitted to the outer periphery of the center pole (5) in an axially movable manner. The vibrating table (1) on which the sample (11) is mounted and the drive coil (2) are coupled to each other via a connecting portion (3) extending substantially orthogonal to the center pole (5). An electrokinetic vibration shock generator. 2. Two center poles (5) are arranged side by side, drive coils (2) are provided on both center poles (5), and the drive coils (2) on both sides and the vibrating table (1) are connected to each other. The electrodynamic vibration and shock generator according to claim 1, characterized in that it is connected via a section (3).