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1. 发明授权

US3894169A Acoustical damping structure and method of preparation 失效
标题翻译：声阻尼结构及其制备方法
公开(公告)号：US3894169A
公开(公告)日：1975-07-08
申请号：US37904373
申请日：1973-07-13
申请人： ROCKWELL INTERNATIONAL CORP
发明人： MILLER DARROW L
IPC分类号： E04B1/82 , E04B1/84 , G10K11/168 , G10K11/04
CPC分类号： E04B1/82 , E04B2001/8461 , G10K11/168 , Y10T428/249986 , Y10T428/249991 , Y10T428/31515 , Y10T428/31551 , Y10T428/31554 , Y10T428/31569 , Y10T428/31573 , Y10T428/31598 , Y10T428/31663 , Y10T428/3183 , Y10T428/31909
摘要： A three-layer composite acoustical damping coating of elastomer base materials, in which the temperature and frequency at which the maximum damping occurs in the damping layer can be adjustable by integrating proper matrix materials and properties within the elastomer. A primer coating, e.g. a silicone primer, is first applied to the surface of a structure to form a bonding base for two succeeding acoustical coatings. To inhibit the transmission of sound into and through the structure a second absorber coat of filled matrix elastomer, e.g. a silicone containing tungsten particles, is applied to the bonding base coat. Such second coat is followed by a third coat having a suitable polymer matrix, such as a polyurethane or an epoxy, which may be unfilled or filled, e.g. with siliceous particles, in such a degree as to be acoustically impedance matched to the velocity of the incoming sound waves and density of surrounding medium whereby sound reflection is obviated. The composite coating therefore behaves as an acoustical attenuator to prevent surface reflection of sound.
摘要翻译：弹性体基材的三层复合声阻尼涂层，其中在阻尼层中发生最大阻尼的温度和频率可以通过在弹性体内积分适当的基体材料和性质来调节。底漆涂层，例如首先将硅氧烷底漆施加到结构的表面以形成用于两个后续声学涂层的粘合基底。为了抑制声音传播到结构中并穿过该结构，第二吸收层填充的基体弹性体，例如，将含硅氧烷的钨颗粒施加到粘合底涂层上。这样的第二涂层之后是具有合适的聚合物基质的第三涂层，例如聚氨酯或环氧树脂，其可以是未填充的或填充的。具有硅质颗粒，在声学阻抗匹配于入射声波的速度和周围介质的密度，从而消除声音反射。因此，复合涂层作为声衰减器来防止声音的表面反射。

2. 发明授权

US3872330A High power acoustical transducer with elastic wave amplification 失效
标题翻译：具有弹性波放大功能的高功率声学传感器
公开(公告)号：US3872330A
公开(公告)日：1975-03-18
申请号：US40953473
申请日：1973-10-25
申请人： ROCKWELL INTERNATIONAL CORP
发明人： MILLER DARROW L , WELLS WILLIAM Y
IPC分类号： H04R3/00 , B06B1/02 , B06B1/06 , H01V7/00
CPC分类号： B06B1/0215 , B06B1/0611 , B06B2201/55
摘要： A high power acoustic transducer is disclosed, comprised of a number of piezoelectric elements acoustically coupled together. To maximize the available energy in each element, the piezoelectric elements are simultaneously charged by a high voltage source through a high impedance path over a relatively long period. An electrical means is provided for discharging each in succession through a low impedance path. The stored energy is thereby released by each element in a very short time to provide an acoustical pulse of high peak power. Each element is discharged with an electrical phase delay such that the elastic wave of each element adds in phase to the elastic wave of the preceding element, resulting in an amplification of the acoustic wave as it progresses down the transmission path. The entire sequence is repeated at a desired rate to produce an acoustical beam of high-peak power.
摘要翻译：公开了一种大功率声学换能器，其包括声耦合在一起的多个压电元件。为了最大化每个元件中的可用能量，压电元件在相对长的时间段内通过高阻抗路径同时由高电压源充电。提供电气装置，用于连续地通过低阻抗路径放电。存储的能量由此在非常短的时间内由每个元件释放以提供高峰值功率的声学脉冲。每个元件以电相位延迟放电，使得每个元件的弹性波相加于前一元件的弹性波，导致当声波向下传播路径时放大声波。以期望的速率重复整个序列以产生高峰值功率的声束。

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