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Time-frequency representation based on time-varying autoregressive model with applications to non-stationary rotor vibration analysis
Sādhanā - Tập 35 Số 2 - Trang 215-232 - 2010
A parametric time-frequency representation is presented based on time-varying autoregressive model (TVAR), followed by applications to non-stationary vibration signal processing. The identification of time-varying model coefficients and the determination of model order, are addressed by means of neural networks and genetic algorithms, respectively. Firstly, a simulated signal which mimic the rotor...... hiện toàn bộ
Dự đoán số người chết vì tai nạn giao thông và triển vọng cho sự di chuyển an toàn bền vững Dịch bởi AI
Sādhanā - Tập 32 - Trang 365-395 - 2007
Xu hướng vĩ mô của số người tử vong do tai nạn giao thông ở bất kỳ quốc gia nào có động cơ được mô tả và dự đoán bởi sản phẩm của các hàm phù hợp khá tốt theo thời gian cho sự suy giảm hàm số nguy cơ tử vong theo đơn vị lưu lượng giao thông và hàm Gompertz hình chữ S cho sự tăng trưởng lưu lượng giao thông. Sản phẩm này định nghĩa sự phát triển có đỉnh đơn trong số người chết do tai nạn giao thông...... hiện toàn bộ
Develop a flux cored wire for submerged arc welding of Ni-Mo low alloy steel
Sādhanā - Tập 45 - Trang 1-10 - 2020
Ni-Mo low alloy steel exhibits an admirable amalgamation of high strength and toughness at subzero temperature and show resistance to brittle fracture with good weldability. This steel has been established to fulfill the needs of specific applications, such as the construction of ships and submarines. To develop a companionable wire for welding of Ni-Mo low alloy steel, the amount of the alloying ...... hiện toàn bộ
An efficient implementation of reconfigurable interpolation root-raised cosine FIR filter for software-defined radio application
Sādhanā - - 2016
Design of optimal high-frequency CMOS VCOs for automotive application
Sādhanā - Tập 45 - Trang 1-6 - 2020
In this paper, a design methodology of Voltage-Controlled Oscillator (VCO) for long-range automotive RAdio Detection And Ranging (RADAR) is proposed and simulation analysis is carried out over Virtuoso SpectreRF software on Cadence tool. The frequency ranges of the mm-wave CMOS current-starved ring and LC VCOs for 45-nm CMOS technology are 24 and 76 GHz, respectively. The ring VCO at 25 GHz oscill...... hiện toàn bộ
Effects of injection pressure and length-diameter ratio on the velocity and cavitation inside injector nozzle
Sādhanā - Tập 46 - Trang 1-12 - 2021
Computational investigation was conducted to understand the effects of various parameters on nozzle flow and cavitation in a diesel fuel injector for a diesel engine. The effects of injector parameters were simulated for different conditions including the injection pressure, the outlet pressure, the position of the needle lift, and the length of the nozzle. Results show that some parameters have o...... hiện toàn bộ
Efficacy of cellulose nanocrystals fabricated from Crotalaria juncea as novel adsorbent for removal of cationic dyes
Sādhanā - Tập 49 - Trang 1-13 - 2024
Porous cellulose nanocrystals (CNCs) have been fabricated by acid hydrolysis of pre-treated Crotalaria juncea bast fibers, a major agricultural waste. The objective of this study is to explore the efficacy of cellulose nanocrystals obtained from C. juncea (CJ) as adsorbent for the removal of dyes. Response surface methodology has been employed to model statistically and optimize the process variab...... hiện toàn bộ
Numerical study of effect of oxygen fraction on local entropy generation in a methane-air burner
Sādhanā - Tập 29 - Trang 641-667 - 2004
This study considers numerical simulation of the combustion of methane with air, including oxygen and nitrogen, in a burner and the numerical solution of local entropy generation rate due to high temperature and velocity gradients in the combustion chamber. The effects of equivalence ratio (Φ) and oxygen percentage (γ ) on combustion and entropy generation rates are investigated for different Φ (f...... hiện toàn bộ
Inverse analysis and multi-objective optimization of coupling mechanism based laser forming process
Sādhanā - Tập 45 - Trang 1-16 - 2019
Laser forming of non-developable surfaces necessitates simultaneous bending and shrinkage of the sheet blank. This can be obtained by coupling mechanism based laser forming. However, soft computing based modeling of this process as well as different laser parameter sets under coupling mechanism giving different optimum combinations of simultaneous bending and shrinkage is rarely reported. In this ...... hiện toàn bộ
Interaction between an elliptic vortex ring and a bubble: effect of capture angle
Sādhanā - - 2024
The rich interaction of multiple bubbles with multiple vortical structures makes the study of bubbly turbulent flows quite challenging. An idealisation of this problem would be the interaction between a single bubble and an elliptic vortex ring, the latter of which can be considered a representative vortical structure. The elliptic vortex ring is characterised by its initial aspect ratio
...... hiện toàn bộ
Tổng số: 2,493
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