Research on Expansion Technique of Lateral Supporting Structure in Explosive Neutralization System Based on Mechanical Mechanics

2013 ◽  
Vol 644 ◽  
pp. 256-259
Author(s):  
Yang Hu ◽  
Han Zhang
Keyword(s):  
Theoretical Calculation ◽  
Chemical Process ◽  
Supporting Structure ◽  
Expansion Technique ◽  
Expansion Time ◽  
Calculation Results ◽  
Double Base ◽  
Physical And Chemical

This paper is focused on the lateral supporting structure of the explosive neutralization system, using the massive gas produced by double base propellant burning in an instance as the expanding power of the lateral supporting structure, which drive the structure to expand smoothly due to the prescribed requirements. In order to accomplish such a complicated physical and chemical process, we choose proper double base propellant and analyses the theory of the burning of double base propellant, build the model instant burning; then calculate parameters such as the force of push, expansion time, make a prototype based on theoretical calculation and make a plan of the experiment. The results of the experiment indicate that the reliability and security of the double base propellant, which is the expanding power of the structure, and that the expanding time of the structure basically tally with the theoretical calculation results.

Physical and chemical process conditions for underground uranium ore leaching

1969 ◽  
Vol 27 (6) ◽  
pp. 1291-1295
Author(s):  
I. K. Lutsenko ◽  
V. G. Bakhurov ◽  
R. S. Meshcherskaya
Keyword(s):  
Chemical Process ◽  
Process Conditions ◽  
Uranium Ore ◽  
Physical And Chemical

Research of Treatment Technology for Electroplating Wastewater

2014 ◽  
Vol 487 ◽  
pp. 713-716 ◽  
Author(s):  
Yi Dan Zhou ◽  
Miao Sun ◽  
Li Juan Wang ◽  
Guan Nan Xi
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Electrochemical Method ◽  
Chemical Process ◽  
Biological Treatment ◽  
Chemical Method ◽  
Treatment Technology ◽  
Electroplating Wastewater ◽  
The Common ◽  
Physical And Chemical

The sources and composition of electroplating waste water are summarized. The common wastewater treatment technology, such as physical and chemical method, physic-chemical process, biological treatment and electrochemical method, and so on. Then the vision for the development of electroplating wastewater treatment technology is made.

MoS2 nanosheets grown on nickel chalcogenides: controllable synthesis and electrocatalytic origins for the hydrogen evolution reaction in alkaline solution

2019 ◽  
Vol 7 (37) ◽  
pp. 21514-21522 ◽  
Author(s):  
Anchun Long ◽  
Wanrong Li ◽  
Min Zhou ◽  
Weicheng Gao ◽  
Bitao Liu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Theoretical Calculation ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Alkaline Solution ◽  
Mos2 Nanosheets ◽  
Controllable Synthesis ◽  
Calculation Results ◽  
Catalytic Mechanisms

Catalytic mechanisms and activity trend of Ni-based heterostructures were revealed by combining experimental data and theoretical calculation results.

The Research on the Stress Analysis of Overhead Steam Pipeline

2020 ◽  
Author(s):  
Zhe Pu ◽  
Jielu Wang ◽  
Bin Ren ◽  
Pan Song ◽  
Fan Zhao
Keyword(s):  
High Temperature ◽  
Stress Analysis ◽  
Industrial Production ◽  
Inspection Method ◽  
Steam Pipeline ◽  
Periodic Inspection ◽  
Whole Plant ◽  
Calculation Results ◽  
Long Time ◽  
Physical And Chemical

Abstract Industrial production is accompanied by a large number of physical and chemical reactions. Steam, whose heat was often used to carry out various production activities, is a common medium in industrial production. Steam pipeline has the characteristics of high temperature and high pressure. The pipeline has been in service at high temperature for a long time, which is prone to metal material degradation such as graphitization and spheroidization. Cause of the expansion of steam pipeline after heating, the natural compensation structure is generally adopted in the whole plant pipe gallery. In recent years, the accidents of steam pipeline occurred frequently, so we must pay more attention to the safety of steam pipeline. Periodic Inspection Regulation for Industrial Pressure Piping (TSG D7005-2018) explicitly requires stress analysis and checking in some cases to determine the safety of the pipeline. The traditional inspection method adopts a random sampling model which has the risk of over inspection and missing inspection. Taking a whole plant steam pipeline as an example, this paper introduced the stress check criterion of pipeline in ASMEB31.3.The model of the pipeline was established by the software, and the stress state and displacement of each node of the pipeline were calculated. According to the calculation results, a targeted inspection scheme was established and effective data support was provided for the regular inspection of steam pipeline.

Research on the Bearing Capacity of Unsupported Random Launching Site

2012 ◽  
Vol 457-458 ◽  
pp. 1096-1100
Author(s):  
Hong Jie Cheng ◽  
Yuan Zhao ◽  
Bin Mao Li ◽  
Jin Chun Zhan
Keyword(s):  
Theoretical Calculation ◽  
Evaluation Model ◽  
Reaction Force ◽  
Data Acquisition System ◽  
Bilateral Symmetry ◽  
Engineering Properties ◽  
Pressure Data ◽  
Bearing Load ◽  
Calculation Results ◽  
Launching Site

Based on the uncertainty of engineering properties of unsupported launching site, fast assessment of preselective site must be done before missile launching, to provide decision for selecting launching position reasonably, and ensure launching missile safely and reliably. Mostly, the launching site is an elastic-plastic structure, the deformation and destruction of launching site is nearly related to the stress and developing process of strain, the support load of the site must be computed before using. In this paper, the bearing load of launching site is analyzed in missile erecting process with the hypothesis that the launching vehicle is bilateral symmetry object. Jack reaction force in erecting process is calculated while the influence of wind load is considered, which provides load criterion for building evaluation model of launching site. The running curve of jack reaction force related to erecting angle is yielded through using pressure data acquisition system. The amplitude and variation trend of jacks reaction force are in well match with theoretical calculation results by analyzing the running curves, and the rationality of result is verified by this way. The research conclusions can offer references for selecting and judging intensity of missile launching site when unsupported random launching way is applied.

scholarly journals Experimental investigation of homogeneous freezing of sulphuric acid particles in the aerosol chamber AIDA

2003 ◽  
Vol 3 (1) ◽  
pp. 211-223 ◽  
Author(s):  
O. Möhler ◽  
O. Stetzer ◽  
S. Schaefers ◽  
C. Linke ◽  
M. Schnaiter ◽  
...  
Keyword(s):  
Ice Formation ◽  
Data Set ◽  
Aerosol Analysis ◽  
Expansion Time ◽  
Aerosol Chamber ◽  
Mechanical Pump ◽  
Expansion Cooling ◽  
Homogeneous Freezing ◽  
Physical And Chemical ◽  
Good Agreement

Abstract. The homogeneous freezing of supercooled H2SO4/H2O solution droplets was investigated in the aerosol chamber AIDA (Aerosol Interactions and Dynamics in the Atmosphere) of Forschungszentrum Karlsruhe. 24 freezing experiments were performed at temperatures between 189 and 235 K with aerosol particles in the diameter range 0.05 to 1 µm. Individual experiments started at homogeneous temperatures and ice saturation ratios between 0.9 and 0.95. Cloud cooling rates up to -2.8 K min-1 were simulated dynamically in the chamber by expansion cooling using a mechanical pump. Depending on the cooling rate and starting temperature, freezing threshold relative humidities were exceeded after expansion time periods between about 1 and 10 min. The onset of ice formation was measured with three independent methods showing good agreement among each other. Ice saturation ratios measured at the onset of ice formation increased from about 1.4 at 231 K  to about 1.75 at 189 K. The experimental data set including thermodynamic parameters as well as physical and chemical aerosol analysis provides a good basis for microphysical model applications.

Design and Simulation of New Tooth Profile of Flexspline for Harmonic Gear Drive

2015 ◽  
Vol 741 ◽  
pp. 99-107
Author(s):  
Li Zu ◽  
Lan Lan Feng ◽  
Yan Yang Sun
Keyword(s):  
Theoretical Calculation ◽  
Process Simulation ◽  
Cutting Tool ◽  
Parametric Design ◽  
Tooth Profile ◽  
Structure Parameters ◽  
Circular Arc ◽  
Gear Drive ◽  
Calculation Results ◽  
Normal Method

We focused on the parametric design and simulation of new tooth profile “circular arc-involute-circular arc” for flexspline in this paper. Based on the MATLAB software, the basic tooth profile of hob was designed. According to gear generating cutting principle, the simulation of processing for flexspline tooth profile has been realized. By tooth profile normal method, we calculated flexspline tooth profile which is conjugated with the basic tooth profile of the cutting tool, and gave the contrastive studies on process simulation and theoretical calculation. Results show that they are feasible in solving the new tooth profile of flexspline. When changing the key structure parameters, the different changing regulations of flexspline tooth profile can be gained. The research results are meaningful to improve the capacity of harmonic gear drive.

Application of Near-Field Acoustic Holography to Identify the Mechanical Noise Sources on the Submarine

2014 ◽  
Vol 635-637 ◽  
pp. 294-298
Author(s):  
Hai Bo Wan ◽  
Shi Jian Zhu ◽  
Qi Wei He
Keyword(s):  
Theoretical Calculation ◽  
Acoustic Field ◽  
Near Field ◽  
Mechanical Equipment ◽  
Pressure Amplitude ◽  
Acoustic Holography ◽  
Noise Sources ◽  
Mechanical Noise ◽  
Calculation Results ◽  
Simulation Results

In order to localize and identify the mechanical noise sources on the submarine, a kind of double-layer submarine model with ring-stiffened was established, and the broadband actuators were put on the inner structure to simulate the mechanical equipment. The radiated acoustic field of the submarine model was reconstructed by the near-field acoustic holography method, which was also compared with the theoretical acoustic field. The simulation results showed that the reconstruction pressure amplitude agreed well with the theoretical calculation results, indicating that the acoustic field of submarine model could be reconstructed accurately by the method of near-field acoustic holography, and the mechanical noise sources would be localized and identified accordingly.

Calculation of Axial Hydraulic Thrust of Francis Turbine

2012 ◽  
Author(s):  
XingYing Ji ◽  
Lai Xu ◽  
Xiao Liu
Keyword(s):  
Numerical Simulation ◽  
Theoretical Calculation ◽  
Significant Role ◽  
Model Test ◽  
Francis Turbine ◽  
Axial Thrust ◽  
Theoretical Methods ◽  
Calculation Results

Put forward a method of calculating the axial thrust of Francis turbine. To use numerical simulation computing the axial thrust on hub, shroud and blade of inner runner, combine theoretical methods calculating the pressure on hub and shroud of outer runner, finally the axial thrust of Francis turbine is obtained. The results of calculation agree with the results of model test. It is an effective way of gathering the theoretical calculation and numerical simulation to calculate the axial thrust of Francis turbine. In addition the static suction of turbine has great effect on calculation results of the axial thrust. The static suction of turbine plays a significant role on the lifting of turbine.

scholarly journals The Design and Implementation of a High-Precision Positioner Fixture

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1227
Author(s):  
Xuesen Zhao ◽  
Rongkai Tan ◽  
Zhe Wang ◽  
Xicong Zou ◽  
Zhenjiang Hu ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
High Precision ◽  
Tooth Profile ◽  
Alignment Error ◽  
Test Results ◽  
Positioning Accuracy ◽  
Design And Implementation ◽  
Cumulative Error ◽  
Half Angle ◽  
Calculation Results

In this paper, a novel positioner fixture with a high repeated positioning accuracy and a high stiffness is proposed and investigated. A high-precision end-toothed disc is used to achieve the high repeated positioning accuracy of the designed positioner fixture. The mathematical models of the cumulative error of the tooth pitch, the tooth alignment error and the error of the tooth profile half-angle of the end-toothed disc are analyzed. The allowable tolerance values of the cumulative error of the tooth pitch, the tooth alignment error and the error of the tooth profile half-angle of the end-toothed disc are given. According to the theoretical calculation results, a prototype positioner fixture is fabricated and its repeated positioning accuracy and stiffness are tested. The test results indicate that the stiffness of the proposed positioner fixture is 1050.5 N/μm, which is larger than the previous positioner fixtures of the same type. The repeated positioning accuracy of the proposed positioner fixture in the x, y and z directions are ± 0.48 μm, ± 0.45 μm and ± 0.49 μm, respectively, which is significantly higher than the previous positioner fixtures.

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