scholarly journals Characteristics Analysis and Modelling of a Pneumatic Underwater Launching System

2018 ◽  
Vol 232 ◽  
pp. 02005
Author(s):  
Bin Li ◽  
Song Guo ◽  
Wei Li ◽  
Deman Zhang ◽  
Nei Wang
Keyword(s):  
Theoretical Calculation ◽  
Calculation Formula ◽  
Numerical Work ◽  
Characteristics Analysis ◽  
Hydrodynamic Noise

Comprehensive characteristics of a pneumatic underwater launching system were analyzed and the simulation was carried out by simulink. The components of the pneumatic underwater launching system were introduced, and the theoretical calculation formula for the system was derived. A rated pressure of 3.5MPa and 5MPa was offered in the numerical work. Analyses in different piston height show good behaviors: Proper increase of piston-initial accumulator pressure is beneficial to reduce hydrodynamic noise, choose the appropriate pressure of accumulator. The hydrodynamic noise of the system can be significantly reduced by optimizing the structure of the double-acting cylinder, increasing the height of the piston and improving the structure of the piston.

Study of Hybrid Method on Beam Crack Evaluation

2012 ◽  
Vol 166-169 ◽  
pp. 1113-1116
Author(s):  
Chuang Du ◽  
Sen Li ◽  
Yan Yan Li ◽  
Zi Tao Du
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Calculation ◽  
Theoretical Calculation ◽  
Hybrid Method ◽  
Crack Width ◽  
Theoretical Method ◽  
Theoretical Formula ◽  
Calculation Formula ◽  
New Formula

Based on the numerical calculation and the theoretical formula for crack width,a new semi-numerical and semi-theoretical calculation formula for crack width of beam was given. By using this new formula,finite element method and theoretical method is combined. The method has been validated with the beam, it is indicated that the proposed method can be used to calculate the crack width of beam accurately and efficiently.

Research and Analysis about Partical Compression for Individual Anchored Prestressed End Strength

2013 ◽  
Vol 395-396 ◽  
pp. 841-844
Author(s):  
Ping Pang
Keyword(s):  
Reinforced Concrete ◽  
Theoretical Calculation ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Calculation Formula ◽  
Concrete Member ◽  
Concrete Members ◽  
Standard Formula ◽  
Reinforced Concrete Member ◽  
Measured Load

According to the specification given, the theoretical calculation formula of the theoretical value is higher than the measured load values. Specifications given by the bureau of compressive bearing capacity formula is suitable for ordinary reinforced concrete member. For prestressed concrete members, especially scattered end anchorage of prestressed concrete member, the standard formula is not applicable.

scholarly journals Theoretical Calculation and Analysis on the Composite Rock-Bolt Bearing Structure in Burst-Prone Ground

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Liang Cheng ◽  
Yidong Zhang ◽  
Ming Ji ◽  
Mantang Cui ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Rock Burst ◽  
Mechanical Model ◽  
Surrounding Rock ◽  
Rock Bolt ◽  
Mining Engineering ◽  
Calculation Formula ◽  
Mining Depth ◽  
Rock Parameters ◽  
Bearing Structure

Given the increase in mining depth and intensity, tunnel failure as a result of rock burst has become an important issue in the field of mining engineering in China. Based on the Composite Rock-Bolt Bearing Structure, which is formed due to the interaction of the bolts driven into the surrounding rock, this paper analyzes a rock burst prevention mechanism, establishes a mechanical model in burst-prone ground, deduces the strength calculation formula of the Composite Rock-Bolt Bearing Structure in burst-prone ground, and confirms the rock burst prevention criterion of the Composite Rock-Bolt Bearing Structure. According to the rock burst prevention criterion, the amount of the influence on rock burst prevention ability from the surrounding rock parameters and bolt support parameters is discussed.

The Study about Anti-Seismic Structures Stirrup Construction Blanking Length Theory Calculation

2014 ◽  
Vol 580-583 ◽  
pp. 2277-2280
Author(s):  
Hui Ling Li ◽  
Xu Xiang Cui ◽  
Yu Han Zhao
Keyword(s):  
Theoretical Calculation ◽  
Calculation Method ◽  
Calculation Formula ◽  
Calculation Methods ◽  
Theory Calculation ◽  
Different Levels

According to the new norm’s requirements and regulations for stirrup and related construction , deducing the theoretical calculation formula of stirrup blanking length of anti-seismic component in different levels. And analyzing it and the three empirical calculation methods comparatively, to find out the application conditions and scope of the empirical calculation method.

scholarly journals Improved soil plug height calculation formula

2021 ◽  
pp. 121
Author(s):  
Keyword(s):  
Theoretical Calculation ◽  
Balance Equation ◽  
Vertical Direction ◽  
Calculation Formula ◽  
Force Analysis ◽  
Soil Plug ◽  
Pipe Pile ◽  
Calculation Results ◽  
Open Pipe ◽  
Multiple Units

This paper analyzes the soil plugging effect of the open pipe pile during the pile sinking process. The soil in the pipe pile is regarded as a continuous and uninterrupted multiple units, and the force analysis is carried out in the vertical direction, and the vertical balance equation of the soil in the pile is obtained. By establishing an equation, the expression of the plug height of the pipe pile during the pile sinking process is obtained. Comparing the theoretical calculation results with the actual project, it is concluded that the theoretical calculation results can reflect the overall change in the height of the soil plug. Therefore, the pile plug height obtained by calculation has certain guiding significance for the project.

Design and Analysis of Synchronous Joint for SAR Antenna Deployable Mechanism

2019 ◽  
Author(s):  
Duanling Li ◽  
Kaijie Dong ◽  
Xingze Wang ◽  
Biao Li ◽  
Zhou Su
Keyword(s):  
Theoretical Calculation ◽  
System Design ◽  
Drive System ◽  
Design Parameters ◽  
Calculation Formula ◽  
Main Design ◽  
Cable Drive ◽  
New Type ◽  
Deployable Mechanism ◽  
Experimental Values

Abstract Synchronous joints are an important part of the SAR antenna deployment mechanism. They are the key to the synchronized deployment of antenna. By means of mechanism combination and deformation, a new type of synchronous joint with a precise cable drive system is designed in order to meet the requirements of SAR antenna deployment mechanism. This study mainly focuses on the design of the synchronous joint, including the system design and the precise cable drive system design. By applying a preload to the drive cable, the transmission gap is reduced, and the accuracy and efficiency of transmission are improved. This paper focuses on the theoretical calculation and analysis of the preload and system stiffness of the precise cable drive system. Based on the Euler equation of the flexible friction drive, the stiffness formula of the cable drive system is derived. In addition, the main design parameters affecting the stiffness of the cable drive system are analyzed parametrically. The comparison between the results obtained from the system stiffness experiment and the theoretical calculation result indicates that the experimental values are slightly smaller than the theoretical values, and the trend of change is basically consistent. This experiment therefore verifies the validity of the stiffness calculation formula and theoretical analysis.

Mechanism and Theoretical Calculations of Buttress Anti-Slide Pile

2013 ◽  
Vol 671-674 ◽  
pp. 713-717
Author(s):  
Xin Xing Wu ◽  
Ying Fa Lu ◽  
Xu Dong Fu
Keyword(s):  
Theoretical Calculation ◽  
Stress Condition ◽  
High Efficiency ◽  
Theoretical Calculations ◽  
Good Effect ◽  
Calculation Formula ◽  
Subgrade Reaction ◽  
Sliding Control

Anti-slide pile was widely used in the slope-sliding control，based on the traditional Anti-slide pile, a kind of high efficiency and good effect new slope anti-slide pile-Buttress Anti-slide Pile-was put forward,which changed the cantilever stress condition and the mechanism of depending entirely on lateral subgrade reaction to balance the landslide thrust of the traditional anti-slide pile, and the theoretical calculation formula is deduced.

scholarly journals A Theoretical Calculation Method of Influence Radius of Settlement Based on the Slices Method in Tunnel Construction

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaoxu Tian ◽  
Zhanping Song ◽  
Bing Wang ◽  
Guannan Zhou
Keyword(s):  
Theoretical Calculation ◽  
Friction Angle ◽  
Surface Settlement ◽  
Calculation Formula ◽  
Theoretical Support ◽  
Reinforcement Measure ◽  
Settlement Calculation ◽  
Influence Radius ◽  
Clay Formation ◽  
The Relationship

At present, the empirical formula is used to calculate the influence radius of surface settlement and the width of settlement trough, which lacks theoretical support. Aiming at this problem, this paper derived the theoretical calculation formula for predicting the influence radius of formation settlement based on the slices method. Then, the expression of the width of settlement trough was obtained according to the relationship between the settlement influence radius and the settlement trough width. The rationality of the formula was verified by the Heathrow Express tunnel and the Green Park tunnel. Through analysis and discussion, it was found that in the clay stratum, the settlement calculation formula can more accurately predict the surface settlement, while there is a big error in predicting the stratum settlement within 4d near the tunnel vault. In the sand layer, the internal friction angle is less than 40°, and the reinforcement surface is applied to the unsupported face to reduce the radius of influence; in the clay formation, when the cohesion is less than 50 kPa, the influence radius can be reduced by applying reinforcement measure to the unsupported face.

Design and Numerical Simulation of High Strength Lightweight RPC Pole

2020 ◽  
Vol 984 ◽  
pp. 245-251
Author(s):  
Fang Da Fu ◽  
Lu Liang Wang ◽  
Hai Long Zhao ◽  
Jun Feng Bai ◽  
Xu Dong Zhou ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Calculation ◽  
High Strength ◽  
Element Model ◽  
Reactive Powder Concrete ◽  
Calculation Formula ◽  
Analysis Software ◽  
Element Analysis ◽  
Reactive Powder

In this paper, finite element model of reactive powder concrete (RPC) pole was established by using finite element analysis software ABAQUS, and the strength of RPC pole was checked. The results of finite element analysis and theoretical calculation are compared to provide a basis for determining the parameters used in finite element modeling and revising the theoretical calculation formula.

The Definition of Apparent Resistivity in Magnetotelluric Sounding

2014 ◽  
Vol 962-965 ◽  
pp. 189-192
Author(s):  
Bao Sheng Huang ◽  
Guo Xiang Yan
Keyword(s):  
Theoretical Calculation ◽  
Model Calculation ◽  
Imaginary Part ◽  
Apparent Resistivity ◽  
Calculation Formula ◽  
Practical Application ◽  
The Real ◽  
Calculation Results ◽  
Definition Of ◽  
Different Characteristics

Different apparent resistivity exists many different characteristics, such as in terms of the speed of tending to real resistivity, the strength of oscillation sexual and the resolution. Aimed at the problem of how to select apparent resistivity in magnetotelluric (MT), this paper compares and analyzes the characteristics of different apparent resistivity in reflecting underground electrical structure by theoretical calculation formula and model calculation, and then summarizes the advantage and disadvantage of different apparent resistivity. The calculation results of several typical geoelectric models show that Basukur apparent resistivity is the best definition method of apparent resistivity, followed in turn, from good to bad, is the apparent resistivity defined by the real part of impedance, discount apparent resistivity, Cagniard apparent resistivity and the apparent resistivity defined by the impedance square module and the apparent resistivity defined by the imaginary part of impedance square, and the apparent resistivity defined by the imaginary part of impedance is the worst. this conclusions provide the judgment basis for practical application.

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