Study on Milling Technology of Screw Motor Stator’s Inner Helicoid and Calculation Method of Milling Cutter Contour

2011 ◽  
Vol 101-102 ◽  
pp. 946-949
Author(s):  
Shu Qiang Wang ◽  
Ke Wang ◽  
Xing Wei Sun ◽  
Xi Min Liu
Keyword(s):  
Computer Simulation ◽  
Cross Section ◽  
Calculation Method ◽  
Processing Method ◽  
Processing Technology ◽  
New Method ◽  
Milling Cutter ◽  
Software Programs ◽  
Point Data

Aiming at the slender hole of the screw motor stator which has a large lead and whose cross-section contour composed by convex and concave curve, the article proposed a processing method using finger milling cutter within a continuous inner helicoid and studied the formed theory about the movement of the tool relative to the workpiece. A new method was proposed to calculate the contour of the tool using limited point data of the contour of workpiece and the related software programs was designed. By designing and implementing of computer simulation, the correctness and feasibility of the processing technology are verified.

Application Study of the Calculation Method for Loads of Multi-Arch and Extra Large Cross Section Tunnels in Double-Side Drifts Construction Method

2012 ◽  
Vol 204-208 ◽  
pp. 1488-1491
Author(s):  
Chong Bang Xu ◽  
Xu Zhao
Keyword(s):  
Cross Section ◽  
Calculation Method ◽  
Construction Method ◽  
New Method ◽  
Large Cross Section ◽  
Application Study ◽  
Construction Sequence ◽  
Construction Procedure ◽  
Temporary Support ◽  
Distribution Mode

The calculation method for load of multi-arch and extra large cross section tunnels (MELCST) is a new method accounting for the influences caused by the multi-step construction procedure and temporary support on tunnels. The paper analyses the application of the method in the double-side drift construction method, and gives the distribution mode and the value of loose loads in various construction sequence, example analysis is also given through Luohanshan tunnel.

scholarly journals The Power Losses in Cable Lines Supplying Nonlinear Loads

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1374
Author(s):  
Bartosz Rozegnał ◽  
Paweł Albrechtowicz ◽  
Dominik Mamcarz ◽  
Monika Rerak ◽  
Maciej Skaza
Keyword(s):  
Bessel Function ◽  
Cross Section ◽  
Power Loss ◽  
Sine Wave ◽  
Active Power ◽  
New Method ◽  
Power Losses ◽  
Nonlinear Loads ◽  
Current Harmonics ◽  
Cable Lines

This paper presents the skin effect impact on the active power losses in the sheathless single-core cables/wires supplying nonlinear loads. There are significant conductor losses when the current has a distorted waveform (e.g., the current supplying diode rectifiers). The authors present a new method for active power loss calculation. The obtained results have been compared to the IEC-60287-1-1:2006 + A1:2014 standard method and the method based on the Bessel function. For all methods, the active power loss results were convergent for small-cable cross-section areas. The proposed method gives smaller power loss values for these cable sizes than the IEC and Bessel function methods. For cable cross-section areas greater than 185 mm2, the obtained results were better than those for the other methods. There were also analyses of extra power losses for distorted currents compared to an ideal 50 Hz sine wave for all methods. The new method is based on the current penetration depth factor calculated for every considered current harmonics, which allows us to calculate the precise equivalent resistance for any cable size. This research is part of our work on a cable thermal analysis method that has been developed.

The Simulation of Vision Measurement System for Cannon Barrel Pose

2012 ◽  
Vol 588-589 ◽  
pp. 1337-1340
Author(s):  
Y.X. Zhu ◽  
X.S. Duan
Keyword(s):  
Computer Simulation ◽  
Measurement System ◽  
Simulation Experiment ◽  
New Method ◽  
Simulation Platform ◽  
Motion Model ◽  
Vision Measurement ◽  
Imaging Model

For the pose measurement of cannon barrel, a vision method through checked plane had been proposed. To test and improve the precision of this new method without considering the hardware error and some other inextricable objective factors，derive the imaging model of the marker (checked plane) from motion model of cannon barrel and the position relative to it using variable-controlling method. Establish the computer simulation platform of vision measurement system for cannon barrel pose based on C++ Builder. The simulation experiment validate the veracity and dependability of this method.

A new method for prediction of the acoustic performance and design parameter sensitivity analysis of multi-chamber perforated resonators with an irregular cross-section

2021 ◽  
pp. 1-24
Author(s):  
Rong Guo ◽  
Zanzan Sun ◽  
Zhen Huang ◽  
Rui Luo
Keyword(s):  
Theoretical Prediction ◽  
Cross Section ◽  
Flow Rate ◽  
New Method ◽  
Frequency Noise ◽  
Acoustic Characteristics ◽  
Inlet Flow ◽  
Acoustic Performance ◽  
Inlet Flow Rate ◽  
Prediction Approach

Abstract Aiming at reducing the high-amplitude and wide-frequency noise in charged air intake system of the powertrain, this paper proposes a new method for predicting the acoustic characteristics of an irregular cross-section multi-chamber perforated resonator under flow conditions. By this method, the presence of three-dimensional sound waves and the effects of higher-order modes are considered, and the acoustic performance of the resonator can be evaluated through the computation of transmission loss. Moreover, by discretizing the cross-section of perforated resonator and extracting node information, this method can solve the acoustic characteristics of the perforated resonator with any cross-section. Based on the transfer matrix method, the quadrupole parameters of each chamber are obtained. Then the acoustic characteristics of the multi-chamber perforated resonator could be calculated. The theoretical prediction data and the experimental data have been compared and the results show good agreement within the entire frequency range, which verifies the accuracy of the theoretical prediction approach. Based on this prediction approach, the influence of section ratio, structure parameters and inlet flow rate on the acoustic characteristics of the resonator is explored. The results show that when the structural parameters change, the peak resonance frequency of the resonator will have a regular shift. With the increase of the inlet flow rate, the main frequency band of sound attenuation will decrease significantly. The theoretical method developed in this work can be used for the calculation and optimization of multi-chamber resonators in various applications.

scholarly journals Analysis of Radar Cross Section Reduction of Fighter Aircraft by Means of Computer Simulation

2014 ◽  
Vol 6 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Luan Silva Carvalho dos Santos ◽  
Luiz Alberto De Andrade ◽  
Adriana Medeiros Gama
Keyword(s):  
Computer Simulation ◽  
Cross Section ◽  
Radar Cross Section ◽  
Fighter Aircraft

Computer simulation of (n, p) modifications in silicon nitride (Si3N4) nanoparticles

2020 ◽  
Vol 34 (32) ◽  
pp. 2050318
Author(s):  
T. G. Naghiyev
Keyword(s):  
Computer Simulation ◽  
Silicon Nitride ◽  
Stable Isotope ◽  
Cross Section ◽  
Cross Sections ◽  
Effective Cross Section

(n, p) transmutations in the silicon nitride (Si3N4) nanoparticles by the neutrons at different energies have been studied by computer simulation. The transmutations by neutrons in the nanomaterial were separately investigated for silicon and nitrogen atoms in the Si3N4 particles. Since the effective cross-section of the possible probability of transmutation is different in the various types of silicon and nitrogen atoms, the modeling was performed separately for each stable isotope. The spectra of the effective cross-sections of the (n, p) transmutations for silicon and nitrogen atoms have been studied in relation to each other.

scholarly journals Penentuan Volume Batubara Menggunakan Metode Cross Section di PT. Astri Mining Resources Cabang Batu Ampar Kalimantan Selatan

2017 ◽  
Vol 14 (2) ◽  
pp. 125
Author(s):  
Megawati Megawati ◽  
Sri Cahyo Wahyono ◽  
Fahruddin Fahruddin
Keyword(s):  
Cross Section ◽  
Research Area ◽  
Plant Residues ◽  
Volume Calculation ◽  
Processing Software ◽  
Image Processing Software ◽  
Drill Point ◽  
Point Data ◽  
Organic Deposits ◽  
Cross Section Method

Coal is a combustible sedimentary rock formed from organic deposits of plant residues and carbon, hydrogen and oxygen elements. Modeling of 3D coal distribution and coal volume calculation plays an important role in the exploration because the result of coal volume calculation can be used as consideration for mining. This research uses 6 drill point and calculation of coal volume using cross section method with the help of image processing software that is rockwork16. The result of interpretation of drill point data in the research area were 5 types of rock layers with each rock volume is claystone (25.840.000 m3), claysand (230.00 m3), Coal (5.930.000 m3), carbonaceus clay and soil.

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