Towed array flow noise data acquisition based on DSP 基于DSP的线列阵流噪声数据采集系统
In this paper, the mechanism of flow noise production and the methods of flow noise reduction are presented. 本文阐述了水下流噪声产生的机理以及物体表面状态性能对湍流边界层的影响。
Study on Numerical Simulation of Flow Noise About Rudder Based on Lilley Broad-bound Noise Source Model 基于Lilley宽带声源模型的舵叶流噪声数值模拟研究
Simulation results show that the reducing flow noise ability of this damping structure can be increased by3 times, as well as it does not affect the sensitivity of hydrophone. 仿真结果表明,该减震结构抑制流噪声能力可提高3倍以上,同时几乎不影响水听器的接收灵敏度。
Producing Mechanism of Flow Noise Generation from Perforated Duct Muffler Element 穿孔管消声单元气流再生噪声产生机理
Then the acoustic properties were discussed by analyzing the mechanism of minimizing flow noise while maximizing transmission of signal. 其次通过分析聚氨酯(PU)的透声和降噪机理,讨论了PU的声学性能;
The measurement mechanism of the random flow noise in the cross correlation measurement system for two component or multi component flow is discussed. According to this analysis, a new theoretical model for the cross correlation flow measurement system, called pixel integration model, is offered. 通过对互相关流量测量系统中随机流动噪声检测机理的理论分析和在超声波气液两相相关流量测量系统上的实验结果,建立了适合于多相流的互相关测量的新的理论模型&叠加模型。
Such pulsation frequency is exactly the main reason that causes a sound of quality to worsen, so the experimental result of this research has offered the direction for suppressing the flow noise within the refrigeration system of the ( refrigerator). 这种脉动频率正是导致声品质恶化的主要原因,为抑制冰箱制冷系统内部流动噪声指明方向。
Flow noise elimination for all optic towed arrays is one of the key technologies for fiber optic hydrophone. 光纤水听器拖曳阵流噪声抑制是光纤水听器实用化的关键技术之一。
It is a common practice to fix mufflers in pipes in order to restrain flow noise caused by pump and valve in seawater piping system. Transmission loss of water muffler is an important index for evaluating performance of muffler. 在海水管路系统中,为抑制泵和阀门所产生的流噪声,通常在管路中安装水消声器,水消声器的传递损失是评价其消声性能的一个重要指标。
The Attenuation of Air Flow Noise& Theory and Application 气流噪声衰减理论与应用
In this paper, the pilot adaptive algorithm is used to process flow noise signals and the two-phase flow velocity is calculated from the estimated flow noise transfer parameters. Both convergence behaviour and flow velocity measurement capability of the algorithm are discussed. 提出利用导向式自适应算法处理两相流的流动噪声信号,以估计出的流动噪声传输参数计算两相流流速,对这种算法的收敛性和流速测量性能进行了论证。
Reduction Effect of Flow Noise in Low Frequency 水筒中涂层降低低频流噪声的作用
Determination of Air Flow Noise Value in Design of Ventilation Shaft of Metro& Tunnel 地铁和隧道通风亭设计中气流噪声值的确定
Treatment& research of impulse air-flow noise in tube 管道中脉动气流噪声的治理研究
The method of characteristic line is presented to study the flow field, forecast the flow noise under the control of signal lamp and overcome shortcomings of differential approach that are constrained by initial condition and unblocked velocity. 提出的特征线算法解决了差分数值格式对初始条件和畅流速度等的制约,以及信号灯控制下的流场分布和噪声预报问题。
This paper introduces the principle of crosscorrelation measurement of non-homogeneous bulk material flow in pipeline and the capacitance sensor applying to sampling the random flow noise and concentration signal. A capacitance/ voltage converter was developed. 本文介绍了互相关法测量管道输送非均匀离散物料的原理和电容传感器用于采集随机流动噪声和浓度信号的理论,研制了相应的电容&电压转换器。
Study on Measurement Method and Characteristic of Flow Noise in Seawater Pipes 海水管路系统流噪声测量方法及特性研究
Experimental study of flow noise scaling of an axisymmetric body 回转体流噪声相似律的实验研究
Study on Measuring Chamberlet Method of Flow Noise in Seawater Pipeline System 海水管路系统中流噪声的小室测量方法的研究
Experimental Study on Flow Noise Characteristics of Air Outlet 风口气流噪声特性的实验研究
The flow noise reduction of Al alloy model with low surface energy coatings have been studied in a water tunnel. 低表面能涂层涂覆在铝合金模型上,考察了其在水筒中低频段降低流噪声的效果。
Empirical mode decomposition and its application in the experiment research of flow noise 经验模态分解(EMD)法及其在流噪声实验研究中的应用
Furthermore, by considering the interval and distribution of alerts, an algorithm evaluating reliability of alert is developed to reduce the false positives caused by flow noise and classification errors. 充分考虑了报警的时间间隔及分布情况,提出一种报警可信度评估算法对SVM分类结果进行二次处理,以消除网络流量噪声及分类错误所带来的影响。
Analysis and control of the refrigerant flow noise in household refrigerator 冰箱中制冷剂流动噪声的分析与控制
A mechanism analysis and experimental study on the flow noise response to the profile of an appendage 突体剖面线型的流噪声机理分析和试验研究
Gas inner leakage of valves is process of jet flow, with jet flow noise, which can be inspected by acoustic method. 阀门气体内漏是一喷流过程,伴随着喷射噪声的产生,利用声学方法可检测到这种噪声。
Under the background of the application of thin line towed array, this thesis investigated the optical fiber hydrophone thin line towed array technology and flow noise suppressing methodology. 本文以细线拖曳阵声纳应用为背景,进行光纤水听器细线阵技术和流噪声抑制技术的研究。
The numerical simulation method of flow noise can supply the theoretical support for the optimal design of cavities of submerged bodies. 本文建立的流噪声数值模拟方法,为水下潜体的开孔优化设计提供了理论支撑。
Theory analysis proves the existence of jet flow noise for gas inner leakage of valves, and the formula between quadrupole acoustic intensity and jet flow speed is obtained. 从理论上证明了阀门气体内漏存在着喷流噪声,得到四极子声源强度与喷流速度的关系式。