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Artykuły w czasopismach na temat „Radiated noise”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 4 lutego 2022

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1

Zhu, Zhibo, Wei Yan, Yongan Wang, Yang Zhao, Tao Zhang i Junshuo Huang. "Noise Analysis Method of Radiated EMI based on Non-linear Principal Component Analysis". Applied Computational Electromagnetics Society 35, nr 10 (8.12.2020): 1144–52. http://dx.doi.org/10.47037/2020.aces.j.351006.

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Aiming at the radiated electromagnetic interference (EMI) noise of electronic equipment, a novel method of radiated EMI noise analysis based on non-linear principal component analysis (NLPCA) algorithm is proposed in this paper. In order to obtain multiple independent common-mode / differential-mode radiated sources, and to find the sources that cause the radiated noises that exceed the limit of standard, NLPCA algorithm is used to process the near-field radiated signals superimposed by multiple radiated sources. The simulation results show that NLPCA can successfully screen out the radiated EMI noises which exceed the limit of standard. Moreover, the experiments are carried out with three models: double-common-mode hybrid sources, double-differential-mode hybrid sources and common-differential-mode hybrid sources. Compared with the traditional independent component algorithm (ICA), the method proposed in this paper can separate the radiated EMI noise sources more accurately and quickly. It can be concluded that the accuracy of NLPCA algorithm is 10% higher than ICA algorithm. This work will contribute to trace the radiated EMI noise sources, and to provide the theoretical basis for the future suppression.

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Skudrzyk, Eugen J. "Radiated flow noise". Journal of the Acoustical Society of America 87, S1 (maj 1990): S79—S80. http://dx.doi.org/10.1121/1.2028373.

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Son, Gwan-Hee, Beom-Soo Kim, Seung-Je Cho i Young-Jun Park. "Optimization of the Housing Shape Design for Radiated Noise Reduction of an Agricultural Electric Vehicle Gearbox". Applied Sciences 10, nr 23 (26.11.2020): 8414. http://dx.doi.org/10.3390/app10238414.

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As the demand for agricultural electric vehicles increases, it is becoming important to conduct noise reduction in consideration of the characteristics of an electric powertrain. This study was conducted to optimize the shape design of gearbox housing for radiated noise reduction of an agricultural electric vehicle gearbox. The noise and vibration of the gearbox were measured considering the noise characteristics of the electric vehicle gearbox, which radiates high-frequency pure tone noise. The main noise source radiated by the structural vibration of the gearbox housing was identified and considered when modeling the loading conditions in the numerical analysis. To improve the reliability, the finite element (FE) model was updated and validated. Internal machine elements were modeled as a substructure through a reduced-order modeling method to reduce the computing time and apply a constant gear excitation force. The weak areas of structure were determined and it was used as the design area for optimization. The topology optimization technique was used to reduce the equivalent radiated power (ERP) which was used as an indicator of radiated noise level. The maximum value of the ERP decreased under all operating conditions at the rated speed.

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4

Zhang, Qing Qing, Yi Qi Zhou i Liang Liang Fan. "Radiated Noise Source Localization of Hydraulic Excavator Based on Wavelet Packet Analysis". Applied Mechanics and Materials 415 (wrzesień 2013): 409–13. http://dx.doi.org/10.4028/www.scientific.net/amm.415.409.

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Collect a hydraulic excavators radiated noise ten meters away under set conditions, and also the relevant noises near the excavator. Analyze noise signals with wavelet packet to get the main band of energy distribution. Then calculate the two signals correlation coefficient, which identifies the muffler exhaust noise and inlet noise as the main source for right rear radiated noise.

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5

Yu, Changshuai, Zhong Luo, Haitao Luo, Siwei Guo, Guangming Liu i Zhenxin Li. "Noise simulation and low noise design of skinned panel structure of scientific experiment rack". MATEC Web of Conferences 336 (2021): 01002. http://dx.doi.org/10.1051/matecconf/202133601002.

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The noise of the scientific experiment rack radiates into the space station through the skinned structure, which directly affects the safety and health of astronauts in orbit for a long time, so it is necessary to carry out low-noise design. Firstly, the finite element model of the panel structure is established, and the correctness of the model is verified by modal test. Secondly, select a point as the vibration excitation point on the finite element model of the plate structure to simulate the vibration input of the excitation source, obtain its vibration response through the modal superposition method, take the vibration response as the boundary condition of the acoustic boundary element, use the modal acoustic transfer vector technology to calculate the radiation noise of the plate structure, and verify it through the noise test in the half anechoic chamber. Then, the acoustic pressure contribution analysis of the radiated noise from the skinned panel structure is carried out, and the panel area which can reduce the radiated noise of the target is determined. The constrained damping layer is applied in this area. The results show that the radiated noise at the target position is significantly reduced.

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6

Li, Zhaoxi, Yaan Li i Kai Zhang. "A Feature Extraction Method of Ship-Radiated Noise Based on Fluctuation-Based Dispersion Entropy and Intrinsic Time-Scale Decomposition". Entropy 21, nr 7 (15.07.2019): 693. http://dx.doi.org/10.3390/e21070693.

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To improve the feature extraction of ship-radiated noise in a complex ocean environment, fluctuation-based dispersion entropy is used to extract the features of ten types of ship-radiated noise. Since fluctuation-based dispersion entropy only analyzes the ship-radiated noise signal in single scale and it cannot distinguish different types of ship-radiated noise effectively, a new method of ship-radiated noise feature extraction is proposed based on fluctuation-based dispersion entropy (FDispEn) and intrinsic time-scale decomposition (ITD). Firstly, ten types of ship-radiated noise signals are decomposed into a series of proper rotation components (PRCs) by ITD, and the FDispEn of each PRC is calculated. Then, the correlation between each PRC and the original signal are calculated, and the FDispEn of each PRC is analyzed to select the Max-relative PRC fluctuation-based dispersion entropy as the feature parameter. Finally, by comparing the Max-relative PRC fluctuation-based dispersion entropy of a certain number of the above ten types of ship-radiated noise signals with FDispEn, it is discovered that the Max-relative PRC fluctuation-based dispersion entropy is at the same level for similar ship-radiated noise, but is distinct for different types of ship-radiated noise. The Max-relative PRC fluctuation-based dispersion entropy as the feature vector is sent into the support vector machine (SVM) classifier to classify and recognize ten types of ship-radiated noise. The experimental results demonstrate that the recognition rate of the proposed method reaches 95.8763%. Consequently, the proposed method can effectively achieve the classification of ship-radiated noise.

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7

Chen, Zhe, Yaan Li, Renjie Cao, Wasiq Ali, Jing Yu i Hongtao Liang. "A New Feature Extraction Method for Ship-Radiated Noise Based on Improved CEEMDAN, Normalized Mutual Information and Multiscale Improved Permutation Entropy". Entropy 21, nr 6 (25.06.2019): 624. http://dx.doi.org/10.3390/e21060624.

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Extracting useful features from ship-radiated noise can improve the performance of passive sonar. The entropy feature is an important supplement to existing technologies for ship classification. However, the existing entropy feature extraction methods for ship-radiated noise are less reliable under noisy conditions because they lack noise reduction procedures or are single-scale based. In order to simultaneously solve these problems, a new feature extraction method is proposed based on improved complementary ensemble empirical mode decomposition with adaptive noise (ICEEMDAN), normalized mutual information (norMI), and multiscale improved permutation entropy (MIPE). Firstly, the ICEEMDAN is utilized to obtain a group of intrinsic mode functions (IMFs) from ship-radiated noise. The noise reduction process is then conducted by identifying and eliminating the noise IMFs. Next, the norMI and MIPE of the signal-dominant IMFs are calculated, respectively; and the norMI is used to weigh the corresponding MIPE result. The multi-scale entropy feature is finally defined as the sum of the weighted MIPE results. Experimental results show that the recognition rate of the proposed method achieves 90.67% and 83%, respectively, under noise free and 5 dB conditions, which is much higher than existing entropy feature extraction algorithms. Hence, the proposed method is more reliable and suitable for feature extraction of ship-radiated noise in practice.

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8

Mohd Haris, Siti Nur Aishah, Mohamed Sukri Mat Ali, Sheikh Ahmad Zaki Shaikh Salim, Sallehuddin Muhamad i Muhammad Iyas Mahzan. "Numerical Simulation of Noise Radiated from a Blunt Trailing Edge". Applied Mechanics and Materials 629 (październik 2014): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amm.629.3.

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The Lighthill acoustic analogy is applied to estimate the noise radiation from ﬂow over a blunt trailing edge. The blunt trailing edge is an effective vortex generator. Periodic vortex shedding near the trailing edge induces ﬂuctuating lift that radiates a strong Aeolian tone. The frequency of the Aeolian tone is similar to that of the vortex shedding. A 50.1 dB of Aeolian tone level is radiated from this blunt trailing edge.

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9

Dahl, Milo D., i Philip J. Morris. "Supersonic Jet Noise Reductions Predicted With Increased Jet Spreading Rate". Journal of Fluids Engineering 120, nr 3 (1.09.1998): 471–76. http://dx.doi.org/10.1115/1.2820686.

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In this paper, predictions are made of noise radiation from single, supersonic, axisymmetric jets. We examine the effects of changes in operating conditions and the effects of simulated enhanced mixing that would increase the spreading rate of the jet shear layer on radiated noise levels. The radiated noise in the downstream direction is dominated by mixing noise and, at higher speeds, it is well described by the instability wave noise radiation model. Further analysis with the model shows a relationship between changes in spreading rate due to enhanced mixing and changes in the far field radiated peak noise levels. The calculations predict that enhanced jet spreading results in a reduction of the radiated peak noise level.

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10

Lu, Ding Ding, i Lin He. "Real-Time Calculation of Noise Radiated by Ship Structure via Machinery Exciting Force Estimation". Applied Mechanics and Materials 226-228 (listopad 2012): 87–91. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.87.

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A method which combines the estimation of machinery exciting force and mechano-acoustical transfer function is proposed in this paper to predict real-time radiated noise by ship structure. The measurement methods of mechano-acoustical and mechano-vibrational transfer functions which are used in radiated noise calculation are described. The feasibility and accuracy are verified by an underwater model experiment. Measurement and calculation results are consistent. The average error of the exciting force estimation is about 2dB, and the average error of radiated noise pressure calculation is about 3dB. The accuracy of the radiated noise calculation is directly affected by exciting forces estimation errors, which can be corrected by a correction factor to increase the accuracy of radiated noise calculation effectively.

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11

Zhu, Zhibo, Wei Yan, Yang Zhao, Xingfa Liu i Tao Zhang. "Separation of Radiated EMI Noise based on Joint Approximate Diagonalization Algorithm". Applied Computational Electromagnetics Society 36, nr 1 (27.02.2021): 41–47. http://dx.doi.org/10.47037/2020.aces.j.360106.

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Power electronic devices and electrical equipment produce a large quantity of radiated electromagnetic interference (EMI) in the working process. Electromagnetic field analysis method of the near-field and far-field of the antenna can be employed to separate the radiated interference noises. However, the method has low separation accuracy and requires a lot of time. A novel method based on joint approximate diagonalization algorithm (JADA) to separate the radiated EMI noise is proposed in this paper. Compared with the traditional independent component algorithm method, the accuracy is improved by 14% and the efficiency is increased by 30%. The common-differential mode mixed noise source is taken as the experimental object to demonstrate the

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12

Hirai, Yukino, Toshio Tsuchiya i Etsuro Shimizu. "Underwater Noise Radiated from Ships". Marine Engineering 54, nr 4 (1.07.2019): 593–97. http://dx.doi.org/10.5988/jime.54.593.

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13

Wales, Stephen C. "Ship‐radiated noise‐field characterization". Journal of the Acoustical Society of America 101, nr 5 (maj 1997): 3197. http://dx.doi.org/10.1121/1.419342.

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14

Hinich, Melvin J., Davide Marandino i Edmund J. Sullivan. "Bispectrum of ship‐radiated noise". Journal of the Acoustical Society of America 85, S1 (maj 1989): S127—S128. http://dx.doi.org/10.1121/1.2026718.

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15

Hinich, Melvin J., Davide Marandino i Edmund J. Sullivan. "Bispectrum of ship‐radiated noise". Journal of the Acoustical Society of America 85, nr 4 (kwiecień 1989): 1512–17. http://dx.doi.org/10.1121/1.397352.

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16

Dong, Ying Hua, Mei Yin Liu i Lei Cao. "EMI Noise Testing and Diagnosis for PV Inverter". Advanced Materials Research 805-806 (wrzesień 2013): 31–35. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.31.

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In this paper, a new method is proposed to test the conducted and radiated electromagnetic interference (EMI) noise of photovoltaic invert based on analysis the internal structure and measuring principle of artificial mains network, meanwhile, the power line radiated EMI noise of photovoltaic can also be estimated by CM noise current using current probe and CM noise extraction network. The experiment result show that the conducted EMI noise and radiated EMI noise of photovoltaic inverter can be test more reasonable by this method.

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17

Zou, Chao, Yimin Wang i Ziyu Tao. "Train-Induced Building Vibration and Radiated Noise by Considering Soil Properties". Sustainability 12, nr 3 (27.01.2020): 937. http://dx.doi.org/10.3390/su12030937.

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Constructing buildings above subway tracks exploits urban-area space intensively by adopting the three-dimensional overlapping development mode, which is one of the important measures for solving the contradictions among urban population increase, land resource shortage, and environmental protection. However, the vibration generated by the frequent train operations is transmitted to the upper buildings through the track structure and ground soil, which can cause structural vibrations and radiated noise and bring physical and mental side effects to occupants within the buildings. Subway projects are often located in geologically sensitive areas, while the influences of the encountered geological problems on the generation and propagation of structural vibration and structure-radiated noise within the buildings are not yet clear. Hence, this paper presents a method of studying the train-induced vibration transmission from the ground up into the buildings and the structure-radiated noise within the building. The method consists of a train-track model, track-soil-building model, and structure-radiated noise simulation. The impact of soil properties on the building vibration and structure-radiated noise is analyzed and ground-improvement measures are proposed in order to mitigate vibration and structure-radiated noise within buildings. The results show that the interaction between soil and structure has a great impact on vibration transmission from the ground into the building. Good foundations reduce vibration transmission from ground soil up into the building and lead to a lower level of structure-radiated noise. Ground improvements increase the impedance of ground soil, thereby weakening the vibration transmission and lowering the structure-radiated noise.

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18

Si, Wang, Yuan, Huang, Lin i Wang. "Numerical and Experimental Investigation on Radiated Noise Characteristics of the Multistage Centrifugal Pump". Processes 7, nr 11 (2.11.2019): 793. http://dx.doi.org/10.3390/pr7110793.

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The radiated noise of the centrifugal pump acts as a disturbance in many applications. The radiated noise is closely related to the hydraulic design. The hydraulic parameters in the multistage pump are complex and the flow interaction among different stages is very strong, which in turn causes vibration and noise problems because of the strong hydraulic excitation. Hence, the mechanism of radiated noise and its relationship with hydraulics must be studied clearly. In order to find the regular pattern of the radiated noise at different operational conditions, a hybrid numerical method was proposed to obtain the flow-induced noise source based on Lighthill acoustic analogy theory, which divided the computational process into two parts: computational fluid dynamics (CFD) and computational acoustics (CA). The unsteady flow field was solved by detached eddy simulation using the commercial CFD code. The detailed flow information near the surface of the vane diffusers and the calculated flow-induced noise source was extracted as the hydraulic exciting force, both of which were used as acoustic sources for radiated noise simulation. The acoustic simulation employed the finite element method code to get the sound pressure level (SPL), frequency response, directivity, et al. results. The experiment was performed inside a semi-anechoic room with a closed type pump test rig. The pump performance and acoustic parameters of the multistage pump at different flow rates were gathered to verify the numerical methods. The computational and experimental results both reveal that the radiated noise exhibits a typical dipole characteristic behavior and its directivity varies with the flowrate. In addition, the sound pressure level (SPL) of the radiated noise fluctuates with the increment of the flow rate and the lowest SPL is generated at 0.8Qd, which corresponds to the maximum efficiency working conditions. Furthermore, the experiment detects that the sound pressure level of the radiated noise in the multistage pump rises linearly with the increase of the rotational speed. Finally, an example of a low noise pump design is processed based on the obtained noise characteristics.

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19

Zhan, Shuai. "Study on Feature Extraction of Ship Radiated Noise Based on Cepstrum and Anti-Noise Property". Advanced Materials Research 981 (lipiec 2014): 786–89. http://dx.doi.org/10.4028/www.scientific.net/amr.981.786.

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Line spectrum is one kind of important feature information of the ship radiated noise, which provides a strong basis for the ship detection and identification. Due to the complexity of marine environment and the special nature of underwater acoustic channel,it is difficult to obtain ship radiated noise’ signals from the complex background noise. Under this situation, this paper proposed the cepstrum as the extraction method of obtaining feature information of the ship radiated noise, and the robust to noise performance was analyzed and compared. The analysis’ result shows that the method is simple, which is able to accurately extract feature line spectrum and shows good robust to noise.

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20

Ju, Yang, Zhe Zhang, Xin Yong Wang i Hai Sheng Xu. "Underwater Radiated-Noise Simulation Control Model Based on Propeller Influencing". Applied Mechanics and Materials 651-653 (wrzesień 2014): 940–43. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.940.

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Underwater target radiated-noise of time domain is significant important in underwater defense and security. Its simulation model based on propeller influencing is considered in this paper. Linear difference equation representing relationship between underwater target radiated-noise of time domain and propeller induced noise is fitted from the data. Dynamical programming is employed to investigate the control of the target radiated-noise. Experimental results show the efficiency of our model and the control methods.

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21

Yuan, Fei, Xiaoquan Ke i En Cheng. "Joint Representation and Recognition for Ship-Radiated Noise Based on Multimodal Deep Learning". Journal of Marine Science and Engineering 7, nr 11 (27.10.2019): 380. http://dx.doi.org/10.3390/jmse7110380.

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Ship recognition based on ship-radiated noise is one of the most important and challenging subjects in underwater acoustic signal processing. The recognition methods for ship-radiated noise recognition include traditional methods and deep learning (DL) methods. Developing from the DL methods and inspired by audio–video speech recognition (AVSR), the paper further introduces multimodal deep learning (multimodal-DL) methods for the recognition of ship-radiated noise. In this paper, ship-radiated noise (acoustics modality) and visual observation of the ships (visual modality) are two different modalities that the multimodal-DL methods model on. The paper specially designs a multimodal-DL framework, the multimodal convolutional neural networks (multimodal-CNNs) for the recognition of ship-radiated noise. Then the paper proposes a strategy based on canonical correlation analysis (CCA-based strategy) to build a joint representation and recognition on the two different single-modality (acoustics modality and visual modality). The multimodal-CNNs and the CCA-based strategy are tested on real ship-radiated noise data recorded. Experimental results show that, using the CCA-based strategy, strong-discriminative information can be built from weak-discriminative information provided from a single-modality. Experimental results also show that as long as any one of the single-modalities can provide information for the recognition, the multimodal-DL methods can have a much better multiclass recognition performance than the DL methods. The paper also discusses the advantages and superiorities of the multimodal-Dl methods over the traditional methods for ship-radiated noise recognition.

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22

Teng, Yue Hui, i Ping Xiang Liu. "Research on Underwater Targets Recognition Based on Decision-Makings Fusion". Advanced Materials Research 546-547 (lipiec 2012): 458–63. http://dx.doi.org/10.4028/www.scientific.net/amr.546-547.458.

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A current problem in the development of passive sonar is the classification of different noise sources. The existing Automatic Underwater Target Recognition Technique (AURT) is mainly based on spectrum analysis of radiated noise in passive sonar. However, with the development of noise control techniques, the radiated noise of underwater targets have been reduced enormously in the past few years, even the working states of the same target also weaken the stationarity of spectrum features of its radiated noise. The objective of this paper concentrates on the AURT with multi-method analysis on radiated noise and decision-makings fusion. A kind of multi-classifier decision-makings fusion model to overcome the non-stationarity is presented. Its application of the model on the data derived from sea trial confirms its validation even in the case of low SNR, and the classification rate is above 83%, better than that of spectrum analysis only.

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23

Giordano, J. A., K. A. Cunefare i G. H. Koopmann. "An Experiment on Optimization of Active Noise Control on a Three-Dimensional Extended Radiator". Journal of Vibration and Acoustics 115, nr 1 (1.01.1993): 53–58. http://dx.doi.org/10.1115/1.2930314.

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In this experiment, a 10.6 dB reduction in the total radiated sound power for an extended radiator was achieved via active control through optimization of active sources. An acoustic boundary element program was used to determine the magnitude and phase of the active sources which minimized the total radiated sound power. This paper details the experimental verification of the numerically predicted active source strengths using a box-shaped acoustic radiator. The top and bottom of the radiator were thin steel plates which were driven in one of their structural modes by an electromagnetic shaker. The four corners of the top plate were removed to accommodate baffled loudspeakers, representing the active sources. To provide precise control of the experiment, the driving signals to the shakers and loudspeakers were generated and monitored by a control computer. The experimental results agreed closely with the analytical prediction, confirming that the optimum reduction had been achieved for the primary and active source configuration. The measured sound pressure reductions in the acoustic field of the radiator ranged from 8 dB to 19 dB for the 1,1 structural mode of the plates.

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Song, Leiming, Hao Chen i Baochuan Li. "Aerodynamic Noise Separation of an EMU Trailer Bogie Area Using Train Operation Tests". Shock and Vibration 2018 (2.12.2018): 1–10. http://dx.doi.org/10.1155/2018/7941980.

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The operation transfer path analysis (OTPA) technique was used to measure the vibration and noise transfer coefficient functions of wheel-rail noise and radiated noise from an electric multiple unit (EMU) train (high-speed train in China) trailer bogie structure to the central area of the trailer bogie for a train running at speeds of 0–5 km/h. By applying these transfer coefficient functions to the noise analysis of high-speed train operation, the contributions of wheel-rail noise and frame-radiated noise to the noise of the bogie area at high speeds are obtained, and the aerodynamic noise is separated from the total noise, providing a reference for vibration damping and noise reduction in high-speed trains. Analysis of test data shows that, in the central area of the trailer bogie of high-speed trains, the low-frequency noise mainly comes from the structural radiated noise of the bogie, and the mid- to high-frequency noise is primarily due to aerodynamic noise. In addition, when an EMU train operates at speeds below 250 km/h, the noise in the central area of the trailer bogie is primarily caused by the structural radiated noise. When the operating speed is higher than 250 km/h, the noise in the central area of the trailer bogie is mainly due to aerodynamic noise, and the aerodynamic noise contribution increases with increase in speed.

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Rose, Michael T., B. Dagan Pielstick, Zach T. Jones, Scott D. Sommerfeldt, Kent L. Gee, Scott L. Thomson, Department of Physics and Astronomy, Brigham i Department of Physics and Astronomy, Brigham. "Case study: Noise reduction of a vacuum-assisted toilet". Noise Control Engineering Journal 68, nr 4 (1.07.2020): 294–302. http://dx.doi.org/10.3397/1/376825.

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Flushing a vacuum-assisted toilet generates noise levels that can be disturbing both to users and those nearby. Peak radiated noise levels correlate with the time when the valve opens and closes, while the noise levels when the valve is com- pletely open are also relatively high. Significant noise ranges between 300 Hz and 3000 Hz. It was hypothesized that increasing the in-tube distance between the flush valve and the bowl in addition to increasing the bend radius of the tube would reduce radiated noise levels. These modifications resulted in a reduction of about 14 dB in the radiated noise during the valve opening and closing in ad- dition to a reduction of about 5 dB while the valve is completely opened. Inter- mediate results of varying the tube length and bend radius are presented to show their effects on the radiated sound levels. Two tube inserts were designed to fit (1) underneath and (2) behind the toilet in a compact manner. They were tested to show that they maintain noise control performance without modifying any other part of the toilet.

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Chen, Hui, Wen Bing Tang, Zhen Guan Cao i Hua Ping Zhou. "Radiation Disturbance of Variable Frequency Winch Drive System in Underground Coal Mines". Applied Mechanics and Materials 441 (grudzień 2013): 552–56. http://dx.doi.org/10.4028/www.scientific.net/amm.441.552.

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In order to study the effect of variable frequency drive system upon electromagnetic radiation environment in underground coal mines, the mechanism of electromagnetic radiation from the variable frequency speed regulation system has been analyzed deeply, and the radiated electromagnetic noise from the variable frequency winch system with rated voltage of 1140V in underground coal mines has been measured. The measuring results show that the radiated emission from variable frequency drive system has certain effects on electromagnetic radiation environment in underground coal mines. The maximum radiated E-field strength reaches 123dBμV/m within the range of 9kHz to 20MHz nearby the frequency converter, and radiated E-field strength is no more than 33dBuV/m above 20MHz. Nearby the winch motor, the radiated E-field strength is weak, but the frequency spectrum of radiated E-field noises is more wide, which mainly distributes from 20MHz to 1GHz, but the maximum radiated E-field strength is less than 37dBμV/m above 20MHz.

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Blanchet, Denis, Willem Van Hal i Arnaud Caillet. "Effect of Beading on Radiated Noise". SAE International Journal of Passenger Cars - Mechanical Systems 3, nr 1 (9.06.2010): 868–74. http://dx.doi.org/10.4271/2010-01-1407.

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Xia, Chang Gao, i Zhen Yu Zhang. "Simulation Analysis on Engine Radiated Noise". Advanced Materials Research 421 (grudzień 2011): 354–59. http://dx.doi.org/10.4028/www.scientific.net/amr.421.354.

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In this paper, in order to analyze and predict surface radiated noise, an engine with 6 cylinders is studied by advanced methods. The loads that the engine block is subjected and the modal participation factors can be obtained through multi-body dynamics calculation; by the finite element method, structural modes of the engine can be gotten; by the acoustic boundary element method and the modal acoustic transfer vector method, the acoustic responses on field points can be obtained. According to the simulation results, the acoustic power and the acoustic pressure distributions on field points and noise frequency characteristic can be identified when the engine is operating at different speeds, and the main noise source can be located. These results provide a reference for noise reduction and amelioration of the engine.

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Wales, Stephen C., i Richard M. Heitmeyer. "Merchant ship‐radiated noise source levels." Journal of the Acoustical Society of America 129, nr 4 (kwiecień 2011): 2366. http://dx.doi.org/10.1121/1.3587657.

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Kannan, Venkatesh. "FUEL RAIL FOR ATTENUATING RADIATED NOISE". Journal of the Acoustical Society of America 133, nr 3 (2013): 1847. http://dx.doi.org/10.1121/1.4795056.

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de Jong, Christ A. F., Leonard J. van Lier i Johan Bosschers. "Surface ship underwater radiated flow noise". Journal of the Acoustical Society of America 116, nr 4 (październik 2004): 2568. http://dx.doi.org/10.1121/1.1853012.

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Ni, E.-J., D. S. Snyder, G. F. Walton, N. E. Mallard, G. E. Barron, J. T. Browell i B. N. Aljundi. "Radiated Noise from Tire/Wheel Vibration". Tire Science and Technology 25, nr 1 (1.01.1997): 29–42. http://dx.doi.org/10.2346/1.2137528.

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Abstract As a general trend, vehicle sound quality has significantly improved in recent years. This is primarily due to improved body structure and powertrain design. As demand for better vehicle sound quality increases, it is important to study all possible noise sources contributing to noise, vibration, and harshness (NVH). Tire vibration has long been recognized as a source of airborne noise. Some effects of wheel design on tire noise have also been well understood for sometime. But the dynamic interaction between tire and wheel designs and its effect on vehicle NVH, although frequently observed for many years, has only recently been identified in the 200–350 Hz frequency range. Different wheels can produce perceptible differences in vehicle interior sound pressure levels in a road test. Hence, the authors have developed a process to quantify and reduce noise caused by a vibrating tire/wheel assembly. This paper discusses the general flow of the process, which begins with the identification of NVH issues on a total vehicle level. Modeling and optimization of the aluminum wheel was chosen as the focus of this project for two reasons. First, the interior sound pressure level (SPL) around 285 Hz is about 5–7 dBA higher in a vehicle equipped with aluminum wheels rather than a steel design. Second, modifying the wheel is far more economical and faster due to its simplicity of design than the complexity of either the vehicle body structure or a tire.

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33

Garcia, Patrick, Dirk Wiemeler i Jan-Friedrich Brand. "Surface radiated noise of exhaust systems". MTZ worldwide 67, nr 11 (listopad 2006): 11–13. http://dx.doi.org/10.1007/bf03227883.

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Lilley, Geoffrey M. "The radiated noise from isotropic turbulence". Theoretical and Computational Fluid Dynamics 6, nr 5-6 (październik 1994): 281–301. http://dx.doi.org/10.1007/bf00311842.

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Yu, Hu, Hong Hou i Liang Sun. "CAE Technology Applied to Range Hood’s Noise Control and Optimization Design". Advanced Materials Research 338 (wrzesień 2011): 543–46. http://dx.doi.org/10.4028/www.scientific.net/amr.338.543.

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In this study we use the CAE technology to compute and reduce the radiated noise of range hood. First, a finite element model of a typical range hood is created using Hypermesh. Then, the surface particle velocity is carried out in Nastran, and the radiated noise is calculated by Sysnoise. Finally, the DOE-based structural optimization is preformed using iSIGHT-FD, in which the sound pressure level at four sensitive points and the radiated sound power are selected as the objective function and the thickness of four panels are adopted as design variable. In addition, the weight of the range hood as a constraint is kept no more than its original weight. As a result, a maximum radiated sound power reduction of 3.66W and a maximum sound pressure level reduction of 4.7 dB are successfully achieved. It shows the CAE technology is a very efficient and effective method for reducing radiated noise.

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36

Yan, Jiaquan, Haixin Sun, En Cheng, Xiaoyan Kuai i Xiaoliang Zhang. "Ship Radiated Noise Recognition Using Resonance-Based Sparse Signal Decomposition". Shock and Vibration 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/6930605.

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Under the complex oceanic environment, robust and effective feature extraction is the key issue of ship radiated noise recognition. Since traditional feature extraction methods are susceptible to the inevitable environmental noise, the type of vessels, and the speed of ships, the recognition accuracy will degrade significantly. Hence, we propose a robust time-frequency analysis method which combines resonance-based sparse signal decomposition (RSSD) and Hilbert marginal spectrum (HMS) analysis. First, the observed signals are decomposed into high resonance component, low resonance component, and residual component by RSSD, which is a nonlinear signal analysis method based not on frequency or scale but on resonance. High resonance component is multiple simultaneous sustained oscillations, low resonance component is nonoscillatory transients, and residual component is white Gaussian noises. According to the low-frequency periodic oscillatory characteristic of ship radiated noise, high resonance component is the purified ship radiated noise. RSSD is suited to noise suppression for low-frequency oscillation signals. Second, HMS of high resonance component is extracted by Hilbert-Huang transform (HHT) as the feature vector. Finally, support vector machine (SVM) is adopted as a classifier. Real audio recordings are employed in the experiments under different signal-to-noise ratios (SNRs). The experimental results indicate that the proposed method has a better recognition performance than the traditional method under different SNRs.

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37

Hall, H. R., W. Brent Ferren i R. J. Bernhard. "Active Control of Radiated Sound from Ducts". Journal of Vibration and Acoustics 114, nr 3 (1.07.1992): 338–46. http://dx.doi.org/10.1115/1.2930267.

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The noise radiated by duct and pipe systems is modeled in the laboratory using a circular duct driven by a speaker at one end. Active control is achieved using a control speaker located adjacent to the open end of the duct. The objective of the investigation was to minimize the total sound power radiated by the duct and a single secondary source. However, the adaptive algorithm used by the controller for this investigation seeks to cancel the acoustic pressure only at a single location; that is, the location of the “error” microphone. Analytical studies predict that in order for the total sound power radiated by primary and secondary sources to be minimized, a single secondary source must radiate sound which is of approximately equal magnitude and opposite phase to the noise source and the error microphone must be placed somewhere in the plane of minimum pressure of an ideal acoustic dipole. These analytical results were verified in part, for the case of the secondary source facing the same direction as the primary source in the plane of the pipe outlet. Other cases were studied where the control speaker was located outside the plane of the duct outlet. The performance improved for these alternative orientations for a wide range of error microphone positions. Measured sound power with and without active control is shown for a range of frequencies and error microphone locations for three configurations of the duct and control source.

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38

Hu, Cheng Jun, Yuan Zheng i Han Bo Zhao. "Periodic Signal Detection in Ship Radiated Noise". Advanced Materials Research 1049-1050 (październik 2014): 1577–80. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.1577.

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Periodic signal is abundant in ship radiated noise. Its detection is an important step towards active control of ship’s acoustic signature. Based on power spectrum analysis and DEMON analysis, an approach to detect line spectrum and modulation spectrum of ship radiated noise is proposed. Periodogram method is used for power spectrum estimation. The separation of line and continuous spectrum, false positive removal, and line spectrum merging are conducted to improve the quality of detected characteristic line spectrum. Via DEMON analysis, steady physical characteristics including propeller’s rotational speed and number of blades are obtained. Finally, the effectiveness of the approach is demonstrated by simulation results.

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39

De Robertis, Alex, Christopher D. Wilson, Scott R. Furnish i Peter H. Dahl. "Underwater radiated noise measurements of a noise-reduced fisheries research vessel". ICES Journal of Marine Science 70, nr 2 (21.11.2012): 480–84. http://dx.doi.org/10.1093/icesjms/fss172.

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Abstract De Robertis, A., Wilson, C. D., Furnish, S. R., and Dahl, P. H. 2013. Underwater radiated noise measurements of a noise-reduced fisheries research vessel. – ICES Journal of Marine Science, 70: 480–484. Vessel-radiated noise is traditionally measured at naval acoustic ranges, but lower-cost options are desirable for routine monitoring of research vessels. Measurements of a noise-reduced research vessel made at a naval noise range are compared to those made using an experimental mooring equipped with commercially available instrumentation. The measurements from the mooring were precise and within 2.5 dB of those from the noise range at third-octave bands <500 Hz. At higher frequencies, direct comparisons were precluded by an intermittent shaft-related noise present only during the mooring measurements, but previously observed at the navy range. The agreement between the two methods suggests that simplified, field-deployable hydrophone systems can be used to accurately characterize the noise signatures of research vessels.

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40

Wang, Liang, i Xiao Sun. "The Engine Oil Sump Radiated Noise Optimization Design". Applied Mechanics and Materials 494-495 (luty 2014): 82–85. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.82.

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This paper introduces the meaning of reducing the radiated noise of oil sump. By using Hyperworks and Nastran, the modal analysis and optimization design of engine oil sump are finished. This paper aims at avoiding the actual measured inherent frequency by increasing modal frequency to reduce the radiated noise. At the same time, the optimum quality allocation of oil sump can be achieved. The result of optimization design can be proved through the test.

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41

Lan, Hua Lin, Yun Fei Lv i Jun Jie Shi. "Measurement for the Ship Noise with a Single Vector Sensor". Applied Mechanics and Materials 303-306 (luty 2013): 448–52. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.448.

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To suppress the interference of radiated noise from the other ship and improve the measurement efficiency, a new method of the measurement for the ship noise with a single vector sensor was proposed. The ship at different direction were classified via the DOA estimation with a single vector sensor, then the radiated noise from the special ship was accumulated. The experiment of measuring the ship noise with a single vector sensor was conducted in the Yellow sea of China in the summer of 2010. The results showed the validity of the given method.

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42

Liu, Hai, Junhong Zhang, Peng Guo, Fengrong Bi, Hanzhengnan Yu i Guangjian Ni. "Sound quality prediction for engine-radiated noise". Mechanical Systems and Signal Processing 56-57 (maj 2015): 277–87. http://dx.doi.org/10.1016/j.ymssp.2014.10.005.

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Umeda, Yoshikuni, i Ryuji Ishii. "Reduction of noise radiated from supersonic jets". Journal of the Acoustical Society of America 100, nr 4 (październik 1996): 2566. http://dx.doi.org/10.1121/1.417383.

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MATSUOKA, Hiroki, Kazuki HOSOKAI, Hiromitsu HAMAKAWA i Eru KURIHARA. "116 Aerodynamic Noise radiated from Wells Turbine". Proceedings of Conference of Kyushu Branch 2014.67 (2014): _116–1_—_116–2_. http://dx.doi.org/10.1299/jsmekyushu.2014.67._116-1_.

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Prokopovich, V. V., i A. V. Shafranyuk. "Underwater radiated noise model of marine object". Journal of Physics: Conference Series 1536 (maj 2020): 012005. http://dx.doi.org/10.1088/1742-6596/1536/1/012005.

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IIDA, Akiyoshi, Hiroyuki TANIDA i Akisato MIZUNO. "Aerodynamic noise radiated from a rotating cylinder". Proceedings of the JSME annual meeting 2004.7 (2004): 53–54. http://dx.doi.org/10.1299/jsmemecjo.2004.7.0_53.

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Clark, Joseph, i Gerald Tarasek. "Radiated noise measurements with vector sensor arrays". Journal of the Acoustical Society of America 119, nr 5 (maj 2006): 3444. http://dx.doi.org/10.1121/1.4808867.

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Cole, S. "Minimizing radiated noise in magnetically sensitive applications". IEEE Instrumentation & Measurement Magazine 16, nr 3 (czerwiec 2013): 12–16. http://dx.doi.org/10.1109/mim.2013.6521128.

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Yang, Su, Zhishun Li i Xinlong Wang. "Vessel radiated noise recognition with fractal features". Electronics Letters 36, nr 10 (2000): 923. http://dx.doi.org/10.1049/el:20000651.

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Spence, Jesse. "Reducing underwater radiated noise from gravel islands". Journal of the Acoustical Society of America 119, nr 5 (maj 2006): 3229. http://dx.doi.org/10.1121/1.4785960.

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