Achieving a proper time-frequency (TF) resolution is the key to extract information from seismic data using TF algorithms and characterize reservoir properties decomposed frequency components. The generalized S-transform (GST) one of most widely used algorithms. However, it difficult choose an optimized parameter set for whole set. In this paper, we propose parameters GST adaptively instantaneous (IF) traces. Our workflow begins with building relationship between IF synthetic wedge model. We...

In this letter, a new method is introduced for seismic time-frequency (TF) analysis. The proposed called synchrosqueezing generalized S-transform (SSGST), which belongs to postprocessing procedure of the GST. frequency-dependent Gaussian window used in standard may be not suitable real applications. order overcome limitation, replaced by parameterized function containing three parameters. These parameters result flexibility variation TF resolution. Then, transform employed squeeze...

The S transform (ST) is one of the most commonly used time-frequency (TF) analysis algorithms and in assisting reservoir characterization hydrocarbon detection. Unfortunately, TF spectrum obtained by ST has a low temporal resolution at frequencies, which lowers its ability thin beds channels In this letter, we propose three parameters (TPST) to optimize flexibly. To demonstrate validity effectiveness TPST, first apply it synthetic data seismic trace then filed data. Synthetic examples show...

Time-frequency (TF) analysis can reveal local variations in seismic data processing and interpretation, where signals are nonstationary time varying. High-quality TF representation (TFR) is important for revealing the information about these describing geological structures. Due to Heisenberg uncertainty principle, traditional methods (e.g., short Fourier transform continuous wavelet transform) cannot get finest resolution best frequency at same time, which leads ambiguous TFR with a...

Persistently and reliably harvesting wind energy to power intelligent online monitoring devices for transmission lines promotes the sustainable development of Internet Things. Current small-scale wind-energy-harvesting devices, relying on a single conversion principle, face challenges such as low efficiency poor performance at speeds. This paper presents coaxial rotating non-contact coupling transducer structure, its optimization methods have been studied, which are based electret...

A 3-D transient finite-element method to analyze the short-time withstand current for an air circuit breaker (ACB) is presented. The cylindrical contact bridge adopted describe constriction between movable and fixed contacts, then considering influence of eddy current, resistivity thermal conductivity variations with temperature, coupled calculation corresponding electromagnetic field can be performed evaluate capability. To verify results based on ACB model, relevant experiments are also...

By building an adaptive filter bank, the empirical wavelet transform (EWT) decomposes analyzed signal into several intrinsic mode functions (IMFs). Although some applications have certified effectiveness of EWT, EWT is affected obviously when analyzing nonstationary signals (e.g., seismic data). In this letter, we propose improved (IEWT) to decompose a IMFs and describe its frequency features. After computing Fourier spectrum signal, scale-space representation (SSR) used extract slowly...

Flame propagation characteristics of natural gas−hydrogen−air mixtures were studied in a constant volume combustion bomb at room temperature and low initial pressures. The laminar burning velocities, the mass fluxes, Markstein number obtained various hydrogen fractions equivalence ratios. results show that unstretched velocity flux increase with fraction gas−hydrogen blend. stability tends to ratio. For specific ratio, decreases fraction, leading an thermodiffusively generated flame...

Natural gas−hydrogen−air premixed combustion was studied in a constant volume bomb over wide ranges of equivalence ratios and hydrogen fractions two initial pressures. A two-zone model used to calculate heat release rate durations based on the pressure data. The study shows that, with increase fraction mixture, normalized mass burning increases while flame development duration total decrease natural gas−hydrogen blends various ratios. small difference maximum for is presented at near...

Quality factor <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$ </tex-math></inline-formula> can be used for hydrocarbon detection and reservoir characterization. The commonly methods estimation include the logarithm spectral ratio (LSR) method, centroid frequency shift (CFS) peak (PFS) method. However, all these are existing limitations respectively. LSR method is sensitive to random noise. CFS PFS lack...

Time-frequency (TF) analysis is a powerful tool in seismic data processing and interpretation, it characterizes the frequency response of subsurface rocks hydrocarbon reservoirs effectively. In this letter, we proposed new method called second-order synchrosqueezing wave packet transform (SSWPT2) for TF analysis. The approach introduces two posttransform, i.e., reassignment (RM) (SST), into transform. Such technique achieves highly concentrated representation by using local estimate...

Time–frequency (TF) analysis is a powerful tool to describe the frequency response of subsurface rocks and hydrocarbon reservoirs. In this letter, matching demodulation synchrosqueezing S transform (MDSST) that achieves highly concentrated TF representation was introduced seismic analysis. The MDSST includes two steps: technique preprocessing provides rough estimation instantaneous (IF) analyzed signal, (SST) postprocessing produces an accurate IF. Numerical experiments on synthetic real...

A method of designing a family robust compensators for single-input/single-output linear system is presented. Each compensator’s transfer function found by using genetic-algorithm search numerator and denominator coefficients. The minimizes the probabilities unsatisfactory stability performance subject to real parameter variations plant. As progresses, are estimated Monte Carlo evaluation. design procedure employs sweep from lowest feasible transfer-function order higher order, terminating...

A 2-D magnetohydrodynamic (MHD) arc model is developed to simulate the influence of venting configuration on air plasma motion in a low-voltage circuit breaker. It demonstrated that fully closed back helpful accelerate due propagation pressure wave. Side- and central-type front-venting configurations are also compared. found velocity higher, yet probability reignition increased for front venting, as consequence differences current density distribution. Using an chamber with different...

Taking into account the properties of arc plasma and electromagnetic, heat rediative phenomena, commercial computational fluid dynamics software PHOENICS has been adapted modified to develop three-dimensional magneto-hydrodynamic (MHD) model in a low voltage circuit breaker. The effects ignition location, venting size gassing material on behavior have investigated. analysis results show that velocity accelerates with increase distance between location size, existence is beneficial improving...

As a powerful tool for hydrocarbon detection and reservoir characterization, the quality factor, Q, provides useful information in seismic data processing interpretation. In this paper, we propose novel method Q estimation. The generalized wavelet (GSW) function was introduced to fit amplitude spectrum of waveforms with two parameters: fractional value reference frequency. Then derive an analytical relation between GSW factor medium. When wave propagates through viscoelastic medium, can be...

As a powerful tool for hydrocarbon detection and reservoir characterization, the quality factor is desirable in seismic data processing interpretation. There are various methods Q estimation, such as logarithm spectral-ration (LSR) method, peak frequency shift (PFS) centroid (CFS) methods. Each method has its own advantages disadvantages. In this paper, we propose novel estimation. The generalized wavelets (GSW) function was designed to fit asymmetric amplitude spectra of source wavelet by...

The change of vibration signal GIS equipment can reflect the internal mechanical state.In order to improve prediction accuracy characteristics equipment, this paper proposes an improved slime mold algorithm optimize CNN-BiLSTM method.First, characteristic parameters are extracted in frequency domain based on historical through Fourier transformation.Secondly, enhance feature utilization ability BiLSTM model, 1D CNN is used extract parameters; differential evolution strategy integrated into...

As the basis of condition-based maintenance, machine health monitoring aims timely to detect incipient faults and quantitatively assess performance degradation. This study proposes a multiscale sparsity measure (SM) fusion framework enhance bearing degradation assessment with SMs. The consists following three steps. First, SMs are constructed by combining analysis adaptive weighted signal preprocessing technique (AWSPT) for enriching status features. Second, scheme including offline training...

The calculation of the critical electric field strength Ecr hot SF6 is important for a compact circuit breaker design. First, reduced (E/N)cr obtained 2, 4 and 8atm respectively, temperature range 300 to 3000K, by solving Boltzmann equation. Then variation with pressure derived from corresponding data SF6. It found that effect could not be neglected predict comparison results at using 2atm, where maximum deviation above 50%. Finally, are used evaluate dielectric breakdown puffer type high...

Non-contact magnetic measurement method is an effective way to study the air arc behavior experimentally One of crucial techniques solve inverse problem for electromagnetic field. This devoted investigating different algorithms this kind preliminarily, including preconditioned conjugate gradient method, penalty function and genetic algorithm. The feasibility each algorithm analyzed. It shown that valid only few segments, estimation accuracy dependent on initial conditions, convergence should...