A New Method to Solving the Internal Mass of Rigid Body Based on the Principle of Inertia Parameters

2013 ◽  
Vol 344 ◽  
pp. 37-40
Author(s):  
Ning Sun ◽  
Huan Yu Li ◽  
Jing Jing Gong
Keyword(s):  
Rigid Body ◽  
Coordinate Transformation ◽  
Dimensional Space ◽  
Three Dimensional ◽  
New Method ◽  
Internal Mass ◽  
System A ◽  
Coordinate Origin ◽  
Inertia Parameters ◽  
Three Dimensional Space

On the basis of Coordinate transformation analysis of the inertia parameters in three-dimensional space, according to the characteristic that the coordinate direction is existed and unique which the product of inertia is 0 when rotating the coordinate system, a new method to judge and calculate the particle information by searching for the intersection of the two lines that lead from two different coordinate origin is proposed. The processes and procedures to calculate the internal mass of rigid body are deduced theoretically. A special numerical example is given to verify the correctness of the theory. The error factors are analyzed qualitatively as well.

scholarly journals Application of SN-EMD in Mode Feature Extraction of Ship Radiated Noise

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Fang Niu ◽  
Juan Hui ◽  
Anbang Zhao ◽  
Yue Cheng ◽  
Yang Chen
Keyword(s):  
High Frequency ◽  
Dimensional Space ◽  
Three Dimensional ◽  
New Method ◽  
Center Frequency ◽  
Radiated Noise ◽  
Mode Decomposition ◽  
Mixing Problem ◽  
Original Information ◽  
Three Dimensional Space

Due to the randomness of added noise, noise-assisted versions based on EMD (empirical mode decomposition) usually cause new “mode mixing” problem. In addition, these algorithms also have problems such as high time-consuming and large recovering error. For the reasons, a new method SN-EMD (Selective Noise-assisted EMD) is put forward in this paper. It determines whether to add noise as assistance by judging whether there is high frequency intermittent component contained in the signal or not. The new method was proved to have the optimal performance by comparing the performance parameters for evaluating the decomposition. In this paper, SN-EMD was used to decompose ship radiated noise. On account of the differences in the original information contained in each mode of radiated noise signals from different ship, we selected the first three modes for processing. Average instantaneous frequency, center frequency, energy density, and energy distribution ratio were extracted as mode feature of ship targets for classification and recognition. Spatial distribution of the feature quantities in three-dimensional space verified similarity of the same target and separability of different targets.

Stereopsis and the Representation of Space

Perception ◽  
1977 ◽  
Vol 6 (3) ◽  
pp. 327-332 ◽  
Author(s):  
Raymond Klein
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Normal Subjects ◽  
Picture Plane ◽  
Perceptual System ◽  
System A ◽  
Mental Rotations ◽  
Important Input ◽  
Better Than ◽  
Three Dimensional Space

Four stereoblind and four normal subjects were tested on a mental rotation task. It was hypothesized that, if stereopsis is an important input for building up the perceptual system that represents three-dimensional space, then subjects lacking it ought to be deficient at mental rotations in depth. Stereoblind subjects were equally efficient at picture-plane and depth rotations, and were nonsignificantly better than normal subjects at rotations in depth. It was concluded that in the absence of stereopsis other cues are sufficient for the development of the ‘three-dimensional’ perceptual system. A puzzling paradox was raised, however, by the finding that the introspections of the two groups differed markedly.

A Fast Digital 3D-SVPWM Algorithm for Four-Leg Converter

2014 ◽  
Vol 541-542 ◽  
pp. 494-497
Author(s):  
Peng Xian Song ◽  
Ping Wang ◽  
Yao Hua Li
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Coordinate Transformation ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Space Vector Pwm ◽  
Space Vector ◽  
Computational Burden ◽  
Three Phase ◽  
Three Dimensional Space

The three-phase four-leg converter can be obtained by adding a bridge into the traditional three-phase three-leg converter. The average mathematical model of three-phase four-leg converter is described in this paper. The three-dimensional space vector PWM (3D-SVPWM) is analyzed. For simplifying the modulation, a fast digital SVPWM algorithm which eliminates coordinate transformation and saves calculating time was proposed. The feasibility of the proposed modulation technique is verified by computer simulation. These results show that the proposed fast digital 3D-SVPWM technique can be easily implemented without conventional computational burden.

Three-Dimensional Simulation of Virtual Plants Branch Structure Based on Quasi Binary-Tree and L System

2014 ◽  
Vol 1049-1050 ◽  
pp. 1650-1653
Author(s):  
Ying Ying Yin
Keyword(s):  
Binary Tree ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Tree Structure ◽  
New Method ◽  
L System ◽  
Dimensional Simulation ◽  
Binary Tree Structure ◽  
Three Dimensional Space

In order to simulate the plant branch structure in three-dimensional space, and extract the growth more efficiently, this paper presented a new method to simulate the structure of plant branch based on quasi binary-tree structure and three-dimensional L system. The results of the actual trees simulation shows that this method can describe the plants branch structure efficiently and provide a new way for the simulation of plants.

Four Dimensional Holospectrum—A New Method for Analyzing Force Distributions

1997 ◽  
Vol 119 (1) ◽  
pp. 95-104 ◽  
Author(s):  
R. Du ◽  
Yue-Dong Chen ◽  
Yubao Chen
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Major Axis ◽  
Minor Axis ◽  
New Method ◽  
Normal Vector ◽  
Force Analysis ◽  
On Line ◽  
Three Dimensional Space

In this paper, a new method, called four dimensional (4D) holospectrum, is introduced for analyzing force distributions. First, it is shown that the dynamics of a three dimensional force can be represented by the holospectrum, which consists of a series of ellipses in a three dimensional space with each ellipse representing the frequency characteristics of the force at a concerned frequency. An ellipse can be described by its normal vector, major axis, minor axis, eccentric ratio, area, and inclination angle. The formula of calculating these quantities are derived next. 4D holospectrum reveals the dynamic characteristics of a three dimensional force such as phase and spatial correlation that cannot be accessed otherwise. As demonstrated by the experimental tests on a spindle, 4D holospectrum adds a new dimension for force analysis and is very valuable for on-line monitoring and diagnosis as well as design.

The principles of a new method, MNF-3D, for concentration of magnetic particles in three-dimensional space

Measurement ◽  
2017 ◽  
Vol 112 ◽  
pp. 137-140 ◽  
Author(s):  
Ryszard Krzyminiewski ◽  
Bernadeta Dobosz ◽  
Grzegorz Schroeder ◽  
Joanna Kurczewska
Keyword(s):  
Magnetic Particles ◽  
Dimensional Space ◽  
Three Dimensional ◽  
New Method ◽  
Three Dimensional Space
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