摘要：【中文】本发明公开了一种基于时域平均主成分构建和时频联合分析的确定性信号提取方法，属于机械的信号处理领域，包括以下步骤：(1)因数矩阵构建；(2)TSA矩阵构建；(3)基于能量指标的矩阵重排；(4)基于差异谱和能量占比的矩阵降维；(5)基于主成分分析的矩阵分解；(6)基于主成分能量指标的矩阵重构；(7)TSA各阶主成分的频域分析；(8)TSA各阶主成分的时频分析。利用本发明，能够在低信噪比条件下实现确定性信号的有效提取。 【EN】The invention discloses a deterministic signal extraction method based on time domain average principal component construction and time-frequency joint analysis, which belongs to the field of mechanical signal processing and comprises the following steps: (1) constructing a factor matrix; (2) constructing a TSA matrix; (3) matrix rearrangement based on energy indexes; (4) reducing the dimension of the matrix based on the difference spectrum and the energy ratio; (5) matrix decomposition based on principal component analysis; (6) matrix reconstruction based on principal component energy indexes; (7) analyzing the frequency domain of the main component of each order of the TSA; (8) and (4) time-frequency analysis of main components of each stage of the TSA. By using the method and the device, the deterministic signal can be effectively extracted under the condition of low signal-to-noise ratio.

摘要：【中文】本发明涉及一种带C形导叶的全导管式双级吊舱推进器，属于船舶推进技术领域。推进器包括导管及包裹于导管内的前叶轮、后叶轮、C形导叶、导叶轮毂与单一的叶轮驱动电机；在导管轴向上，C形导叶位于前叶轮与后叶轮之间；叶轮驱动电机的定子与转子均水密地套装在导叶轮毂内，用于驱使前叶轮与后叶轮同向转动；在导管径向上，该C形导叶固设在导叶轮毂与导管之间，且导叶腹部相对导叶两端部均朝前叶轮的旋转方向拱起，用于降低导管出口水流的环向速度，以回收叶轮旋转所转换生成的环向旋转能量。通过在前后轮之间布设C形导叶，不仅能回收环向旋转能量，以提高能耗功效，且能便于设备的安装与后续维护，可广泛应用于船舶、舰艇等等领域中。 【EN】The invention relates to a full-duct type double-stage pod propeller with C-shaped guide vanes, and belongs to the technical field of ship propulsion. The propeller comprises a guide pipe, a front impeller, a rear impeller, a C-shaped guide vane, a guide vane wheel hub and a single impeller driving motor, wherein the front impeller, the rear impeller, the C-shaped guide vane, the guide vane wheel hub and the single impeller driving motor are wrapped in the guide pipe; in the axial direction of the duct, the C-shaped guide vane is positioned between the front impeller and the rear impeller; the stator and the rotor of the impeller driving motor are both sheathed in the impeller hub in a watertight manner and are used for driving the front impeller and the rear impeller to rotate in the same direction; in the radial direction of the guide pipe, the C-shaped guide vane is fixedly arranged between the guide vane wheel hub and the guide pipe, and the abdomen part of the guide vane is arched towards the rotating direction of the front impeller relative to the two end parts of the guide vane and is used for reducing the circumferential velocity of water flow at the outlet of the guide pipe so as to recover circumferential rotating energy generated by the rotation of the impeller. By arranging the C-shaped guide vanes between the front wheel and the rear wheel, the annular rotation energy can be recycled to improve the energy consumption effect, the equipment can be conveniently installed and maintained subsequently, and the guide vanes can be widely applied to the fields of ships, naval vessels and the like.

摘要：【中文】本发明公开一种用于水下航行器的水平轴海流发电装置，该发电装置布置在水下航行器的回转体的凹槽内，其包括起落架单元、偏航单元、发电单元，通过起落架单元实现整个发电装置的起落，通过偏航单元使得发电单元能够实现在水平面内360°任意旋转，因此可以随着海流方向的改变进行主动偏航实现迎流功能，发电单元通过对转的前叶片和后叶片分别带动外轴和内轴转动，从而带电机内、外转子反方向相对转动，切割磁感线进行发电。本法的发电装置可控性强、转换效率高、结构紧凑，可作为单独模块直接装载水下航行器上；本装置将海流动能转化为供水下航行器使用的电能，从根本上解决了水下航行器的能源供给问题。 【EN】The invention discloses a horizontal shaft ocean current power generation device for an underwater vehicle, which is arranged in a groove of a revolving body of the underwater vehicle and comprises an undercarriage unit, a yaw unit and a power generation unit, wherein the undercarriage unit is used for realizing the lifting of the whole power generation device, the yaw unit is used for enabling the power generation unit to rotate freely in 360 degrees in a horizontal plane, so that the active yaw can be carried out along with the change of the ocean current direction to realize the current-receiving function, and the power generation unit respectively drives an outer shaft and an inner shaft to rotate through a front blade and a rear blade which rotate oppositely so as to carry out the opposite rotation of the inner rotor and the outer rotor in a motor and cut a magnetic induction line to generate power. The power generation device has strong controllability, high conversion efficiency and compact structure, and can be directly loaded on an underwater vehicle as an independent module; the device converts ocean current kinetic energy into electric energy for the underwater vehicle, and fundamentally solves the problem of energy supply of the underwater vehicle.

摘要：【中文】本发明公开了一种基于辐射噪声调制的桨叶数特征提取方法，包括以下步骤：在调制图上寻找局部峰值，以及局部峰值出现处的谐振频率；确定轴频以及其谐振频率数；根据轴频以及叶频的倍频关系，确定其他谐振频率的值；确定各处谐波频率处的平均谱相干值；用朴素贝叶斯的推断方法，得到桨叶数。利用本发明的方法，能够对各种民用船舶辐射噪声调制谱进行分析，方便的提取出轴频、叶频信息和桨叶数特征量。 【EN】The invention discloses a method for extracting blade number characteristics based on radiation noise modulation, which comprises the following steps: searching a local peak value on a modulation chart and a resonance frequency at which the local peak value appears; determining the axial frequency and the number of the resonant frequencies of the axial frequency; determining values of other resonant frequencies according to the frequency multiplication relation of the axis frequency and the leaf frequency; determining an average spectral coherence value at each harmonic frequency; the blade number is obtained by a naive Bayes inference method. The method of the invention can be used for analyzing the radiation noise modulation spectrums of various civil ships, and conveniently extracting the shaft frequency, the blade frequency information and the blade number characteristic quantity.

摘要：【中文】本发明公开了一种基于快速谱峭度分析的风机健康评价方法，属于旋转机械的健康评估领域，首先采集风机不同工况振动信号，构建原始数据库，从原始振动信号中提取有效的统计学信息；对于待检测信号，通过计算不同频率位置下信号的峭度值，获取风机振动信号的最优解调频带的中心频率和频带宽度进行信号滤波，通过对该段时域信息进行傅里叶变换得到频域信息，将待测风机的振动信息与数据库中不同工况下的振动数据进行对比分析，获得待测风机的健康因子，从而反映该风机的健康程度。利用本发明的方法，可以提高对冲击信号的敏感性，进而准确的反应风机的健康程度。 【EN】The invention discloses a fan health evaluation method based on rapid spectral kurtosis analysis, which belongs to the field of health evaluation of rotary machinery, and comprises the steps of firstly, acquiring vibration signals of a fan under different working conditions, constructing an original database, and extracting effective statistical information from the original vibration signals; for a signal to be detected, the kurtosis values of the signal under different frequency positions are calculated, the center frequency and the frequency bandwidth of the optimal demodulation frequency band of the fan vibration signal are obtained for signal filtering, the time domain information of the segment is subjected to Fourier transform to obtain frequency domain information, the vibration information of the fan to be detected and vibration data under different working conditions in a database are subjected to comparative analysis to obtain health factors of the fan to be detected, and therefore the health degree of the fan is reflected. By utilizing the method, the sensitivity to the impact signal can be improved, and the health degree of the fan can be accurately reflected.

摘要：【中文】本发明公开了一种基于自相关谱和均衡平方包络谱的离心泵汽蚀状态判别方法，包括：采集离心泵不同状态振动信号；对各状态下的信号做自相关谱和均衡平方包络谱处理；对选取的信号进行小波变换与主成分分析，并根据主成分分析结果与自相关谱、均衡平方包络谱的图谱结果，选取特征频率；根据特征频率与参数设计原则，计算不同状态下的参数数值，并确定汽蚀判断阈值；对于待测离心泵，采集振动信号后按上述步骤进行处理，并计算当前参数数值；利用恒虚警率自适应门限的方法，根据噪声强度自适应调整阈值；将当前参数数值与阈值进行比较判断是否汽蚀。本发明的方法，根据参数自动判断离心泵是否发生汽蚀，具有较强的抗噪能力以及强大的实用性。 【EN】The invention discloses a centrifugal pump cavitation state discrimination method based on an autocorrelation spectrum and a balanced square envelope spectrum, which comprises the following steps: collecting vibration signals of the centrifugal pump in different states; performing autocorrelation spectrum and balanced square envelope spectrum processing on the signals in each state; performing wavelet transformation and principal component analysis on the selected signals, and selecting characteristic frequencies according to principal component analysis results and spectrum results of autocorrelation spectrums and balanced square envelope spectrums; calculating parameter values under different states according to the characteristic frequency and a parameter design principle, and determining a cavitation judgment threshold; for the centrifugal pump to be tested, processing the vibration signal according to the steps after the vibration signal is collected, and calculating the current parameter value; the threshold value is adaptively adjusted according to the noise intensity by utilizing a constant false alarm rate adaptive threshold method; and comparing the current parameter value with a threshold value to judge whether cavitation exists. The method of the invention can automatically judge whether the centrifugal pump generates cavitation according to the parameters, and has stronger anti-noise capability and strong practicability.