JPH0446518B2 - - Google Patents
Info
- Publication number
- JPH0446518B2 JPH0446518B2 JP13851384A JP13851384A JPH0446518B2 JP H0446518 B2 JPH0446518 B2 JP H0446518B2 JP 13851384 A JP13851384 A JP 13851384A JP 13851384 A JP13851384 A JP 13851384A JP H0446518 B2 JPH0446518 B2 JP H0446518B2
- Authority
- JP
- Japan
- Prior art keywords
- head mass
- ring
- mass
- head
- vibrator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000919 ceramic Substances 0.000 claims description 24
- 238000005452 bending Methods 0.000 description 17
- 230000005855 radiation Effects 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
- B06B1/0618—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile of piezo- and non-piezoelectric elements, e.g. 'Tonpilz'
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、水中超音波トランスジユーサに用い
られるボルト締めランジユバン振動子に係わり、
特にアクテイブソーナーに利用されるトランスジ
ユーサに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bolted lunge transducer used in an underwater ultrasonic transducer.
In particular, it relates to transducers used in active sonar.
（従来技術）
ボルト締めランジユバン振動子は第１図に示す
ように、アルミ合金、チタン合金などの高剛性材
料からなり音響放射を行うヘツドマス１１、ヘツ
ドマス１１とリアマス１３の間に配置されたリン
グ状圧電セラミツク１２、フロントマスと同様に
ステンレススチール等の高剛性材料からなるリア
マス１３、及びリング状圧電セラミツク１２に圧
縮応力を加える機能を有する高張力鋼からなるボ
ルト１４、ナツト１５によつて構成されている。
この振動子は、あらかじめ大きな圧縮応力が加え
られる構造となつているため、圧電セラミツク固
有の張力強度の数倍の強度が得られるため、ハイ
パワー駆動が可能であるという大きな特徴を有し
ている。隣接するリング状圧電セラミツク１２ど
うしは第１図の矢印に示すように長手方向に互い
に反対方向に分極処理が施され、横効果縦振動モ
ード（31モード）に比べてはるかに大きな電気機
械結合係数が得られる縦効果縦振動モード（33モ
ード）が用いられる。これらのリング状圧電セラ
ミツク１２は、パワーアンプによつて駆動されや
すいように電気的に並列に接続される。尚、この
ような構造のボルト締めランジユバン振動子にお
いては、周知の如く２分の１波長共振モードが用
いられ、リング状圧電セラミツクス１２部分に振
動節点が存在する。第１図においてヘツドマス１
１の音響放射端から振動節点までの距離l0及び振
動節点からリアマス端面までの距離l′0はそれぞれ
実効的な４分の１波長である。(Prior art) As shown in Fig. 1, the bolted lunge van oscillator includes a head mass 11 that is made of a highly rigid material such as aluminum alloy or titanium alloy and that radiates sound, and a ring-shaped head mass 11 that is arranged between the head mass 11 and the rear mass 13. It consists of a piezoelectric ceramic 12, a rear mass 13 made of a highly rigid material such as stainless steel like the front mass, and a bolt 14 and a nut 15 made of high tensile strength steel that have the function of applying compressive stress to the ring-shaped piezoelectric ceramic 12. ing.
This vibrator has a structure in which a large compressive stress is applied in advance, so it has a strength several times the tensile strength inherent to piezoelectric ceramics, and has the great feature of being able to be driven at high power. . Adjacent ring-shaped piezoelectric ceramics 12 are polarized in opposite directions in the longitudinal direction, as shown by the arrows in Figure 1, and have a much larger electromechanical coupling coefficient than the transverse effect longitudinal vibration mode (31 mode). The longitudinal effect longitudinal vibration mode (33 modes) is used. These ring-shaped piezoelectric ceramics 12 are electrically connected in parallel so that they can be easily driven by a power amplifier. As is well known, in the bolted LangueVant vibrator having such a structure, a half wavelength resonance mode is used, and a vibration node exists in the ring-shaped piezoelectric ceramic 12 portion. In Figure 1, head mass 1
The distance l 0 from the acoustic radiation end of No. 1 to the vibration node and the distance l' 0 from the vibration node to the rear mass end face are each an effective quarter wavelength.
（従来技術の問題点）
上述した水中超音波トランスジユーサに用いら
れるボルト締めランジユバン振動子は、所望の指
向性を得るために通常多数個配列されて用いら
れ、このように多数個配列された振動子アレイは
必然的に大型でかつ極めて重いものになるため、
最近ボルト締めランジユバン振動子の小型、軽量
化が強く要求されている。ボルト締めランジユバ
ン振動子の小型、軽量化をはかる最も有効な手段
として、井上等により、日本電子通信学会超音波
研究会US83−58，pp17−24「水中超音波トラン
スジユーサの小型軽量化のための検討」と題され
た論文によりヘツドマスの厚さl1を小さくするこ
とがもつぱらなされている。しかしながら、ヘツ
ドマスの厚さl1を薄くして行くと、確かに小型軽
量化がはかられるが、ヘツドマス１１が第１図の
点線で示したように屈曲振動を行うようになる。
ヘツドマス自身が屈曲振動を行うと、ヘツドマス
中心部と周辺部で振動変位が異り、はなはだしく
は中心部と周辺部で位相が異り、もはやピストン
放射面とはみなされなくなり、音響放射効率が著
しく劣化するといつた致命的な問題がある。従つ
て、従来ヘツドマスの厚さをむやみに薄くするこ
とはできず、ボルト締めランジユバン振動子の小
型軽量化をはかる場合、このヘツドマスの屈曲振
動が最大の障害となつていた。(Problems with the prior art) The bolt-fastened lunge transducers used in the above-mentioned underwater ultrasonic transducer are usually arranged in large numbers in order to obtain the desired directivity. Since the transducer array is necessarily large and extremely heavy,
Recently, there has been a strong demand for smaller and lighter bolt-tight lunge resonators. As the most effective means for reducing the size and weight of bolt-tight lunge transducers, Inoue et al. In a paper titled ``Study of ``Head mass thickness l1' ', efforts were made to reduce the thickness of the head mass l1. However, if the thickness l1 of the head mass is made thinner, although it is true that the head mass 11 is made smaller and lighter, the head mass 11 starts to undergo bending vibration as shown by the dotted line in FIG.
When the head mass itself undergoes bending vibration, the vibration displacement is different between the center and the periphery of the head mass, and the phase is significantly different between the center and the periphery, so that it is no longer considered as a piston radiation surface, and the acoustic radiation efficiency is significantly reduced. There is a fatal problem when it deteriorates. Therefore, conventionally, the thickness of the head mass cannot be reduced unnecessarily, and the bending vibration of the head mass has been the biggest obstacle when it comes to reducing the size and weight of a bolted lunge resonator.
（発明の目的）
本発明はボルト締めランジユバン振動子の小型
軽量化とともにハイパワー化を達成させるために
なされたものである。(Object of the Invention) The present invention has been made in order to achieve a reduction in size and weight of a bolted lunge-mounted vibrator as well as an increase in power.
（発明の構成）
本発明はリング状圧電セラミツクと、この前後
にそれぞれ配置されるヘツドマス及びリアマス
と、これらを結合するボルトを備えたボルト締め
ランジユバン振動子において、ヘツドマス中央部
に孔部が形成され、該孔部に前記ボルトと結合し
たサブヘツドマスが設置されており、ヘツドマス
とサブヘツドマスは少なくとも当該振動子の中心
軸と直角又は直角以外の所定の角度（当該所定の
角度は中心軸と平行方向は除く）をなす面で接し
ており、当該ヘツドマスとサブヘツドマスが接す
る面を該振動子の中心軸方向から見たときのリン
グ状又は正多角形環状の形状のリング厚みの中心
点が形成する形状の面積をS1とし、前記リング状
圧電セラミツクの厚みの中心部が形成する円の面
積をS2とするとき、
1/2S2S1S2
とすることを特徴とするボルト締めランジユバン
振動子である。(Structure of the Invention) The present invention provides a bolt-tight lunge resonator comprising a ring-shaped piezoelectric ceramic, a head mass and a rear mass disposed before and after the ring-shaped piezoelectric ceramic, and bolts for connecting these, in which a hole is formed in the center of the head mass. , a sub-head mass connected to the bolt is installed in the hole, and the head mass and sub-head mass are at least perpendicular to the central axis of the vibrator or at a predetermined angle other than the right angle (the predetermined angle excludes a direction parallel to the central axis). ), and the area of the shape formed by the center point of the ring thickness of a ring-shaped or regular polygonal annular shape when the surface where the head mass and sub-head mass are in contact is viewed from the central axis direction of the vibrator. A bolt - tight Lange-Vant vibrator characterized in that, where S1 is the area of the circle formed by the center of the thickness of the ring-shaped piezoelectric ceramic, S2 is 1 / 2S2S1S2 . .
（本発明の作用原理）
水中超音波トランスジユーサ用ボルト締めラン
ジユバン振動子の小型軽量化をはかるためには、
材料面ではヘツドマス材料はAl合金のように軽
量でかつ剛性の大きな材料でなければならない
が、形状面ではヘツドマスを従来のものより相当
薄くする必要がある。しかしながら第１図に示し
た従来のボルト締めランジユバン振動子では、ヘ
ツドマスに加わる撓みモーメントのため、ヘツド
マス自身が屈曲振動を行い、中心部と周辺部分で
は大幅に振動振幅が異り、はなはだしくは位相が
互いに180゜異なるといつた悪影響がある。(Principle of operation of the present invention) In order to reduce the size and weight of a bolted lunge transducer for an underwater ultrasonic transducer,
In terms of material, the head mass material must be lightweight and highly rigid, such as Al alloy, but in terms of shape, the head mass must be considerably thinner than conventional ones. However, in the conventional bolt-tight lunge vibrator shown in Figure 1, the head mass itself undergoes bending vibration due to the bending moment applied to the head mass, and the vibration amplitude differs significantly between the center and the periphery, and the phase is significantly different. If they differ by 180 degrees from each other, there is a negative effect.
第２図に、ヘツドマスに働く撓みモーメントを
解明するための第１図に示した振動子前半部の物
理モデルを示す。第２図において、Ｆはヘツドマ
ス１１に働く剪断力、R2は圧電セラミツクリン
グ１２の平均半径、Ｙ−Y′は解析のために設け
た音響放射面に平行な直線、矢印は剪断力の方
向、Ｐ，Ｑはヘツドマス１１と圧電セラミツクリ
ング１２の力の作用点、P′（＝Q′）はヘツドマス
１１とボルト１４の力の作用点を示す。第２図に
示した物理モデルについて、ヘツドマスの屈曲振
動の原因となる撓みモーメントついて考察する。
圧電セラミツク部分が電圧を印加され保電逆効果
によつて伸びた場合、ボルト部分は圧電性をもた
ないわけであるから、ヘツドマスを介して強制的
に伸ばされる。このとき第２図に示した方向に力
Ｆが働き、ヘツドマスには合計２R2Fなる撓みモ
ーメントが発生する。圧電セラミツクスが圧電逆
効果により縮んだ場合は、第２図に全く逆向きの
剪断力が働き全く逆向きの撓みモーメントが発生
する。この剪断力を小さくするためには、当然の
ことながら剛性の小さなボルトを用いれば良いわ
けであるが、リング状圧電セラミツク部分に必要
かつ十分な圧縮応力を供給しなければならないた
め、ボルトの剛性を小さくするためには一定の限
界がある。 FIG. 2 shows a physical model of the front half of the vibrator shown in FIG. 1 for elucidating the bending moment acting on the head mass. In Figure 2, F is the shearing force acting on the head mass 11, R2 is the average radius of the piezoelectric ceramic ring 12, Y-Y' is a straight line parallel to the acoustic radiation surface provided for analysis, and the arrow is the direction of the shearing force. , P, and Q indicate the point of application of the force between the head mass 11 and the piezoelectric ceramic ring 12, and P'(=Q') indicates the point of application of the force between the head mass 11 and the bolt 14. Regarding the physical model shown in Figure 2, we will discuss the bending moment that causes the bending vibration of the head mass.
When a voltage is applied to the piezoelectric ceramic part and the piezoelectric ceramic part stretches due to the reverse effect of holding electricity, the bolt part does not have piezoelectricity, so it is forcibly stretched through the head mass. At this time, a force F acts in the direction shown in FIG. 2, and a total deflection moment of 2R 2 F is generated in the head mass. When the piezoelectric ceramic contracts due to the reverse piezoelectric effect, a shearing force in the completely opposite direction acts as shown in FIG. 2, and a bending moment in the completely opposite direction is generated. In order to reduce this shearing force, it is natural to use bolts with low rigidity, but since it is necessary to supply the necessary and sufficient compressive stress to the ring-shaped piezoelectric ceramic part, it is necessary to increase the rigidity of the bolt. There is a certain limit to how small it can be.
本発明のヘツドマスの屈曲振動を抑圧する原理
は、剪断力Ｆを十分小さくすることが困難である
が、モーメントの腕の長さを小さくすることによ
り、撓みモーメントを小さくすることにある。従
来の第１図に示すような従来の振動子ではモーメ
ントの腕の長さは相当大きなものになつており、
撓みモーメントもモーメント腕の長さに比例して
大きくなつている。 The principle of suppressing the bending vibration of the head mass of the present invention is to reduce the bending moment by reducing the length of the moment arm, although it is difficult to sufficiently reduce the shearing force F. In a conventional vibrator as shown in Fig. 1, the moment arm length is quite large.
The deflection moment also increases in proportion to the length of the moment arm.
即ち、モーメント腕の長さを十分小さくできる
ような振動子の形状が与えられれば、ヘツドマス
の屈曲振動変位は小さくなるわけである。次に、
撓みモーメントを小さくした本発明のボルト締め
ランジユバン振動子のヘツドマス周辺部分の構造
の例を第３図ａ，ｂ，ｃに示す。 That is, if the shape of the vibrator is such that the length of the moment arm can be made sufficiently small, the bending vibration displacement of the head mass will be reduced. next,
An example of the structure of the head mass peripheral portion of the bolted lunge van oscillator of the present invention in which the bending moment is reduced is shown in FIGS. 3a, b, and c.
第３図ｂ，ｃにおいて、１１はヘツドマス、３
２はヘツドマス１１に接しているサブヘツドマス
３１の突起部３２である。該突起部３２がヘツド
マス１１と接する面（振動子中心軸と平行な面は
除く）を振動子中心軸方向から見たときに見える
リング形状（この場合はサブヘツドマス断面は円
形とする）のリングの厚みの中心点を結ぶとこの
場合半径R1の円（面積をS1とする）が形成され
る。また圧電セラミツクリングの厚みの中心部分
は半径R2の円（面積S2とする）を形成する。本
発明の構造では（R2−R1）がモーメント腕の長
さとなるが、R2−R1を十分小さくすることがで
きるため、ヘツドマスの屈曲振動を抑圧すること
ができるわけである。尚、第３図においてサブヘ
ツドマスがヘツドマスと接する小突起部分が形成
するング状図形を円であるとしたが、正方形、正
五角形、正六角形などの正多角形であつても同じ
効果が得られることは言うまでもない。 In Figures 3b and c, 11 is a head mass, 3
2 is a protrusion 32 of the sub-head mass 31 that is in contact with the head mass 11. The surface of the protrusion 32 in contact with the head mass 11 (excluding the surface parallel to the transducer central axis) is a ring shape that appears when viewed from the transducer central axis direction (in this case, the sub-head mass cross section is circular). In this case, by connecting the center points of the thickness, a circle with radius R 1 (area S 1 ) is formed. Further, the center of the thickness of the piezoelectric ceramic ring forms a circle with radius R 2 (area S 2 ). In the structure of the present invention, (R 2 −R 1 ) is the length of the moment arm, and since R 2 −R 1 can be made sufficiently small, the bending vibration of the head mass can be suppressed. In addition, in FIG. 3, the ring-shaped figure formed by the small protrusion portion where the sub-head mass contacts the head mass is a circle, but the same effect can be obtained even if it is a regular polygon such as a square, a regular pentagon, or a regular hexagon. Needless to say.
（実施例）
以下本発明の実施例について図面を参照して詳
細に説明する。第４図に本発明の一実施例を示す
断面図で、第４図においてl0は音響放射端から振
動節点までの実効的４分の１波長、l1はヘツドマ
スクの厚さを示す。ここではl1／l0＝0.2とした。
第４図の振動子は共振周波数12kHzヘツドマス音
響放射断面積が36cm2、圧電セラミツクの実効半径
R2が形成する円の面積S2は6.16cm2（＝πR2 2）であ
る。また、第４図においてサブヘツドマス３１の
小突起が形成する面積S1（πR2 1）を種々変えてい
つたとき、ヘツドマスの音響放射面の共振周波数
12kHzにおける変位分布を外縁部を１と規準化し
て第５図に実線で示す。また第４図と外見は全く
同じ形状を有する第１図に示すような従来の振動
子のヘツドマスの変位分布を第５図に点線で示
す。第５図においてｙは中心軸からの距離、εは
規準化された変位を示す。従来の振動子では、ヘ
ツドマス中心付近の変位が負になつているが、こ
れはヘツドマス周辺部の変位に対して位相が180゜
逆転していることを示すものである。本発明のよ
うな構造を有する振動子であつてもS1／S2＞１で
あれば破線（S1／S2＝1.1）で示すようにサブヘ
ツドマス自身の屈曲振動が励振されサブヘツドマ
ス中心部分とヘツドマス外周部分とは位相が180゜
異つてしまい、実用上の長所は半減する。また
S1／S2＜0.5においてもヘツドマス自身の屈曲振
動を十分に抑圧することができない。(Example) Examples of the present invention will be described in detail below with reference to the drawings. FIG. 4 is a sectional view showing an embodiment of the present invention, in which l 0 represents the effective quarter wavelength from the acoustic radiation end to the vibration node, and l 1 represents the thickness of the head mask. Here, l 1 /l 0 =0.2.
The vibrator in Figure 4 has a resonant frequency of 12 kHz, a head mass acoustic radiation cross section of 36 cm 2 , and an effective radius of piezoelectric ceramic.
The area S 2 of the circle formed by R 2 is 6.16 cm 2 (=πR 2 2 ). In addition, when the area S 1 (πR 2 1 ) formed by the small projections of the sub-head mass 31 is varied in FIG. 4, the resonance frequency of the acoustic radiation surface of the head mass 31 is varied.
The displacement distribution at 12kHz is normalized to 1 at the outer edge and is shown as a solid line in FIG. Furthermore, the displacement distribution of the head mass of the conventional vibrator shown in FIG. 1, which has the same external shape as FIG. 4, is shown by dotted lines in FIG. In FIG. 5, y represents the distance from the central axis, and ε represents the normalized displacement. In the conventional vibrator, the displacement near the center of the head mass is negative, which indicates that the phase is reversed by 180 degrees with respect to the displacement around the head mass. Even with a vibrator having the structure of the present invention, if S 1 /S 2 >1, the bending vibration of the sub-head mass itself is excited as shown by the broken line (S 1 /S 2 = 1.1), and the sub-head mass center part and The phase is 180° different from that of the outer peripheral portion of the head mass, and its practical advantages are halved. Also
Even when S 1 /S 2 <0.5, the bending vibration of the head mass itself cannot be sufficiently suppressed.
尚、以上の実施例においてヘツドマスはすべて
Al合金、圧電セラミツクとしてジルコン・チタ
ン酸鉛系圧電セラミツクス、ボルトとして高張力
鋼、サブヘツドマスとしてAl合金を用いた。 In addition, in the above example, all head masses are
An Al alloy, a zircon-lead titanate based piezoelectric ceramic was used as the piezoelectric ceramic, a high tensile strength steel was used as the bolt, and an Al alloy was used as the sub-head mass.
ボルト締めランジユバン振動子の小型軽量化を
はかる場合、ヘツドマスを薄肉化する必要がある
が、従来の構造であればヘツドマス自身が屈曲
し、そのため音響放射端における媒質排除量が激
減し、良好な音響放射が下可能になるといつた欠
点を有していた。本発明に従つたボルト締めラン
ジユバン振動子では、ヘツドマスの屈曲振動を抑
圧して良好な音響放射が可能である。 When aiming to reduce the size and weight of a bolted lunge resonator, it is necessary to make the head mass thinner, but with the conventional structure, the head mass itself is bent, which drastically reduces the amount of medium excluded at the acoustic radiation end, resulting in good acoustics. It had the disadvantage that radiation could be lowered. In the bolted lunge vibrator according to the present invention, it is possible to suppress the bending vibration of the head mass and achieve good acoustic radiation.
また、サブヘツドマス３１の外径がセラミツク
リングの実効直径2R2とほとんど等しい場合は本
発明の条件に従う限り第６図に示したように小突
起を設けなくとも良好な音響放射を行うことがで
きる。さらに、サブヘツドマスとボルトが一体化
されていても本発明の効果はいささかも阻害され
ることはないことは言うまでもない。 Further, if the outer diameter of the sub-head mass 31 is almost equal to the effective diameter 2R2 of the ceramic ring, good sound radiation can be achieved without providing small protrusions as shown in FIG. 6 as long as the conditions of the present invention are followed. Furthermore, it goes without saying that even if the sub-head mass and the bolt are integrated, the effects of the present invention will not be impaired in the slightest.
（発明の効果）
以上述べた如く、本発明に従つたボルト締めラ
ンジユバン振動子は小型、軽量化かつハイパワー
化に優れており、従来の振動子の性能を大幅に凌
駕するものであり工業的価値も甚大である。(Effects of the Invention) As described above, the bolt-fastened lunge resonator according to the present invention is compact, lightweight, and has high power, and greatly exceeds the performance of conventional resonators, making it suitable for industrial use. The value is also enormous.
第１図は従来のボルト締めランジユバン振動子
の概略図、第２図はボルト締めランジユバン振動
子の前半部物理モデルを示す図、第３図ａ，ｂ，
ｃは本発明のボルト締めランジユバン振動子のヘ
ツドマス周辺部分を示す図、第４図は本発明の一
実施例を示す振動子の概略図、第５図は共振時に
おけるヘツドマス音響放射面の変位分布を示す
図、第６図は本発明の他の一実施例を示す図であ
る。
図において、１１はヘツドマス、１２は圧電セ
ラミツクス、１３はリアマス、１４はボルト、１
５はナツト、３１はサブヘツドマス、３２は小突
起。
Fig. 1 is a schematic diagram of a conventional bolt-tight lunge transducer, Fig. 2 is a diagram showing a physical model of the first half of the bolt-tight lunge transducer, Fig. 3 a, b,
c is a diagram showing the peripheral part of the head mass of the bolted lunge van oscillator of the present invention, FIG. 4 is a schematic diagram of the vibrator showing an embodiment of the present invention, and FIG. 5 is a displacement distribution of the head mass acoustic radiation surface during resonance. FIG. 6 is a diagram showing another embodiment of the present invention. In the figure, 11 is a head mass, 12 is a piezoelectric ceramic, 13 is a rear mass, 14 is a bolt, 1
5 is a nut, 31 is a subhead mass, and 32 is a small protrusion.
Claims (1)
ぞれ配置されるヘツドマス及びリアマスと、これ
らを結合するボルトとを備えたボルト締めランジ
ユバン振動子において、ヘツドマス中央部に孔部
が形成され、該孔部に前記ボルト結合したサブヘ
ツドマスが設定されており、ヘツドマスとサブヘ
ツドマスは少なくとも当該振動子の中心軸と直角
又は直角以外の所定の角度（当該所定の角度は中
心軸と平行方向は除く）をなす面で接しており、
当該ヘツドマスとサブヘツドマスが接する面を該
振動子の中心軸方向から見たときのリング状又は
正多角形環状の形状のリング厚みの中心点が形成
する形状の面積をS1とし、前記リング状圧電セラ
ミツクの厚みの中心部分が形成する円の面積をS2
とするとき、 1/2S2S1S2 とすることを特徴とするボルト締めランシユバン
振動子。[Scope of Claims] 1. A bolted lunge resonator comprising a ring-shaped piezoelectric ceramic, a head mass and a rear mass disposed before and after the ring-shaped piezoelectric ceramic, and bolts connecting these, in which a hole is formed in the center of the head mass. , the bolted sub-head mass is set in the hole, and the head mass and the sub-head mass are at least perpendicular to the central axis of the vibrator or at a predetermined angle other than the right angle (the predetermined angle excludes a direction parallel to the central axis). are in contact with each other on a surface that forms
The area of the shape formed by the center point of the ring thickness of the ring shape or regular polygonal annular shape when the surface where the head mass and the sub-head mass are in contact is viewed from the central axis direction of the vibrator is S1 , and the ring-shaped piezoelectric The area of the circle formed by the center of the thickness of the ceramic is S 2
1/2S 2 S 1 S 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13851384A JPS6118299A (en) | 1984-07-04 | 1984-07-04 | Langevin vibrator tightened with bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13851384A JPS6118299A (en) | 1984-07-04 | 1984-07-04 | Langevin vibrator tightened with bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6118299A JPS6118299A (en) | 1986-01-27 |
| JPH0446518B2 true JPH0446518B2 (en) | 1992-07-30 |
Family
ID=15223901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13851384A Granted JPS6118299A (en) | 1984-07-04 | 1984-07-04 | Langevin vibrator tightened with bolt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6118299A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62176397A (en) * | 1986-01-30 | 1987-08-03 | Nec Corp | Non-directional underwater ultrasonic transducer |
| FR2713429B1 (en) * | 1993-12-03 | 1996-02-09 | France Etat Armement | High power emission process for acoustic waves and corresponding transducer pavilions. |
| JP6201489B2 (en) * | 2013-07-29 | 2017-09-27 | 日本電気株式会社 | SOUND CONVERSION DEVICE AND SOUND CONVERSION METHOD |
-
1984
- 1984-07-04 JP JP13851384A patent/JPS6118299A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6118299A (en) | 1986-01-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |