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Feature Extraction Method Based on Pseudo-Wigner-Ville distribution for Rotational Machinery in Variable Operating Conditions
feature extraction pseudo-wigner-ville distribution
2011/8/4
In the case of fault diagnosis for roller bearings, the conventional diagnosis approaches by using the time interval of energy impacts in time-frequency distribution or the pass-frequencies are based ...
Feature Extraction Method Based on Pseudo-Wigner-Ville distribution for Rotational Machinery in Variable Operating Conditions
feature extraction pseudo-wigner-ville distribution variable operating condition
2011/8/4
In the case of fault diagnosis for roller bearings, the conventional diagnosis approaches by using the time interval of energy impacts in time-frequency distribution or the pass-frequencies are based ...
Data Extraction From CAD Model For Rotational Parts to be Machined at Turning Centres
Data Extraction Process Planning DXF Post-Processing
2009/10/14
Among the most important data produced and stored is product data. CAD data forms one of many
contributors to product data. Although in most circumstances CAD data can be processed within the CIM env...
旋流自吸泵内部湍流场大涡模拟（Large Eddy Simulation on Interior Flow Field of Rotational Flow Self-priming Pump）
旋流自吸泵 大涡模拟 性能预测
2009/9/25
旋流自吸泵蜗壳结构不同于普通泵，具有特殊的流场结构。采用大涡模拟方法和滑移网格技术，通过对设计工况下旋流自吸泵三维非定常湍流场的数值计算，捕捉到泵叶轮和蜗壳内的压力分布、速度分布和尾迹区内旋涡的结构与演化特征等重要流动信息，结果表明叶轮内部静压具有一定的非对称性。分析了分离室内漩涡形成的原因。对含气率分布的分析表明，叶轮中气相主要集中于叶片的吸力面区域。对旋流自吸泵的性能进行预测，得到了预测性能曲...
水泵转速变化对进出水流道水力损失的影响（Influence of Rotational Speed of Pumps on Hydraulic Losses in Suction Boxes and Discharge Passages）
水泵 转速 水力损失 进出水流道
2009/8/11
在比较各种进出水流道水力损失研究方法的基础上，运用计算流体动力学方法数值模拟了4种水泵装置内部流动，研究水泵转速变化对进出水流道水力损失的影响。数值计算结果表明，由于水泵装置中进水流道内部流动受水泵叶轮旋转引起的水流预旋的影响，因而小于无泵单独运行时的水力损失。水泵转速变化后，在相同流量下，进水流道的水力损失基本不变。水泵导叶出口水流条件和剩余环量影响出水流道的水力特性，水力损失随流量变化的关系非...
Variable Rotational Speed Control for Fixed-pitch Type Wind Turbines Using LPV Techniques
Rotational Speed Fixed-pitch Type LPV
2009/4/30
In the paper, we consider the problem of variable rotational speed control for a wind turbine with the pitch fixed from the view point of scheduling by wind speed. For this problem, we apply LPV (Line...
Multi-Shed Rotational Formation (Along the Warp) of Woven Structures
pile loop double-woven structures complex linear textile
2009/2/5
A new concept and implementation is presented of multi-shedding based on rotational formation
of woven structures along the warp. The difference between the hitherto designed
rotational construction...
Dynamical flexibilities of mechanical rotational systems
Applied mechanics Numerical techniques Vibrations Transportation effect
2010/1/19
Purpose: of this work is to present dynamical flexibilities of rotational beams and rods systems. The results of
mathematical calculations were presented in the form of dynamical flexibility of analy...
Analysis and modelling of rotational systems with the Modyfit application
Numerical techniques Computational mechanics Applied mechanics
2010/2/4
Purpose: of this article is to present an application to analysis and modelling of rotational systems. Independent modules of application enables controlling and regulation of characteristics of syste...
Pure rotational Raman lidar with fiber Bragg grating for temperature profiling of the atmospheric boundary layer
pure rotational Raman lidar fiber Bragg grating
2011/5/6
A new pure rotational Raman lidar (PRRL) system at a wavelength of 532.25 nm has been designed for profiling the atmospheric temperature of the planetary boundary layer. A newly compact spectroscope s...
Methods for optimization of rotational latency of the inverse loading of trucks on international routes
international transportations automobile vehicles return loading waiting time optimization specific profit
2010/11/2
The increase of the efficiency of international car transportation of cargoes is an actual problem. For the solution to delivery problems at present the information systems on the basis of INTERNET-te...