CAJ | 학술논문

换能器与功率放大器之间的匹配网络设计是宽带大功率水声发射系统的关键技术之一.把水声换能器、功率放大器及其联系两者的匹配网络视为一整体,从系统的观点出发,提出了一种分频段匹配宽带水声换能器的处理方法.通过对水声换能器的导纳特性和发射电压响应的分析,合理地选择匹配网络参数.该方法能充分发挥换能器在不同频段中的特性,实现水声发射系统的宽频带工作.水池实验验证了该方案的有效性:在2～16kHz带宽范围内,发射电压响应级起伏ΔTVR和发射声源级起伏ΔSL均得到改善,尤其在感兴趣的4～15kHz的宽带范围内,功率因数得到显著改善,功放管耗明显降低,发射电压响应级起伏ΔTVR从21dB降到14dB,发射电压声源级起伏ΔSL从24dB降到7dB,但对功放的安全保护电路提出了更高的要求.
환능기여공솔방대기지간적필배망락설계시관대대공솔수성발사계통적관건기술지일.파수성환능기、공솔방대기급기련계량자적필배망락시위일정체,종계통적관점출발,제출료일충분빈단필배관대수성환능기적처리방법.통과대수성환능기적도납특성화발사전압향응적분석,합리지선택필배망락삼수.해방법능충분발휘환능기재불동빈단중적특성,실현수성발사계통적관빈대공작.수지실험험증료해방안적유효성:재2～16kHz대관범위내,발사전압향응급기복ΔTVR화발사성원급기복ΔSL균득도개선,우기재감흥취적4～15kHz적관대범위내,공솔인수득도현저개선,공방관모명현강저,발사전압향응급기복ΔTVR종21dB강도14dB,발사전압성원급기복ΔSL종24dB강도7dB,단대공방적안전보호전로제출료경고적요구.
Matching network design between the transducer and the power amplifier is one of the key techniques for the broadband, high power underwater acoustic transmitter system. Treating the transducer, the power amplifier and the matching network as one entirety, a new piecewise matching method was proposed. By analyzing the admittance characteristics and the transmitting voltage response of the transducer, the matching network parameters were chosen reasonably. With the goal of increasing transmitting bandwidth and improving power factor, the new piecewise matching method provides a good performance. The water-tank experiments show for the bandwidth of 2-16kHz, both the fluctuation dynamic range of transmitting voltage response level ΔTVR and the transmitting source level ΔSL are well-controlled; especially for the interested bandwidth of 4-15kHz, the power factor is increased and the power dissipation is reduced obviously, the fluctuation dynamic range of transmitting voltage response level ΔTVR decreases from 21dB to 14dB, the fluctuation dynamic range of the transmitting source level ΔSL decreases from 24dB to 7dB, however, the better protection circuit is required to the power amplifier of the system, which demonstrate the effectiveness of the system.