Calculation of Interaction Force between Pipe and Water of HVAC

2014 ◽  
Vol 1046 ◽  
pp. 165-168
Author(s):  
Zhi Bin Luo
Keyword(s):  
Interaction Force ◽  
Linearization Method ◽  
Hydraulic Calculation ◽  
Pipe Network ◽  
The Finite Element Method ◽  
Calculation Methods ◽  
Iterative Calculation ◽  
Network Utilization ◽  
Storage Node ◽  
And Storage

On the basis of the pipe network hydraulic calculation of basic theory, the pipe network utilization, using graph theory and peak array build relationships and storage node and pipe sections between the pipeline node associated with the hydraulic parameters of pipe sections linked together establish a common heating pipe network hydraulic calculation models. Matrix for the model were derived solving ideas based on the finite element method and linearization method for existing node equation method to improve to get a new heating network hydraulic calculation methods common to construct a new iterative calculation equation, to improve the convergence of iterative calculation.

Hydraulic Calculation Method Study of Branch Shape Water-Injection Pipe Network Based on Binary Tree

2011 ◽  
Vol 317-319 ◽  
pp. 2266-2270
Author(s):  
Li Xin Wei ◽  
Jiang Bo Wen ◽  
Lu Ying Zhang ◽  
Yan Chun Xu ◽  
Peng Li
Keyword(s):  
Computer Program ◽  
Calculation Method ◽  
Binary Tree ◽  
Water Injection ◽  
Hydraulic Calculation ◽  
Pipe Network ◽  
Structure Characteristics

On the basis of analyzing process and structure characteristics of branch shape water-injection pipe network, this paper established a hydraulic calculation method of branch shape water-injection pipe network based on binary tree. This method has many advantages, such as calculation speed is fast, occupying less memory, having high calculation accuracy, and so on. According to it, this paper compiled a computer program and presented an actual example.

Simulation of Dynamics During Deployment of Foldable Origami Structures

2020 ◽  
Vol 20 (05) ◽  
pp. 2050058
Author(s):  
Qian Zhang ◽  
Yangqing Liu ◽  
Meng Li ◽  
Yunlong Han ◽  
Jianguo Cai ◽  
...  
Keyword(s):  
Driving Forces ◽  
Dynamic Effect ◽  
The Finite Element Method ◽  
Plate Structures ◽  
Quadrilateral Plate ◽  
Dynamic Deployment ◽  
Nodal Coordinates ◽  
Triangular Elements ◽  
And Storage ◽  
Raphson Iteration

Foldable origami-based structures are a type of deployable structures that are increasingly applied in the space and building industries. When folded, the small size of such structures facilitates transportation and storage. Meanwhile, the properties of their larger deployed state may be of interest to different applications. A stable working condition is established by locking the structure in its deployed state, as in the process of deployment, the driving forces may generate a dynamic effect, thus leading to instability of the system. Hence, the study of dynamic characteristics of such structures, including trajectory, duration, velocity, and acceleration is of paramount importance. In this paper, based on the general dynamic equation and Lagrange’s equations of the first kind, the finite element method is adopted to investigate the dynamic deployment of foldable plate structures in terms of the generalized nodal coordinates. The proposed geometric description of a quadrilateral plate element is based on a folding plate composed of refined triangular elements, which are used to approximate the real shells in the structure. Subsequently, a MATLAB framework is developed on the basis of the element using the Newmark integration and the Newton–Raphson iteration method to simulate the deployment process of the structure. Comparisons between MATLAB results and ADAMS results verify the reliability of the framework in analyzing the dynamic deployment of the foldable origami-based structures with sufficient accuracy.

The Hydraulic Calculation and Reformation Application of Yuhua Heating Network in Shijiazhuang Based on Graph Theory

2011 ◽  
Vol 374-377 ◽  
pp. 606-609
Author(s):  
Jian Jun Hu ◽  
Hua Yang ◽  
Chun Hua Sun ◽  
Cheng Ying Qi ◽  
Guo Qiang Xia
Keyword(s):  
Graph Theory ◽  
Hydraulic Calculation ◽  
Pipe Network ◽  
Study Test ◽  
Actual Operation ◽  
Security And Reliability ◽  
Uneven Heating ◽  
Annular Pipe ◽  
Investigation And Study ◽  
Source Ability

In heat source ability sufficient situation, Yuhua network in Shijiazhuang had some phenomenon, such as uneven heating, serious disorders, the far-end heating reliability was insufficient. Based on the basic principle of Graph theory, this article carried on the detailed hydraulic calculation to the annular pipe network, determined and implemented the reasonable transformation program, finally carried on the investigation and study test to the actual operation network after reformation. The results show that after reformation, the actual heating network runs well, improves the heating security and reliability, so the hydraulic calculation method based on Graph theory is accurate, and has certain guiding sense to other pipe networks' energy conservation reformation.

scholarly journals The problem of hydraulic calculation of pressure distribution pipelines

2021 ◽  
Vol 6 (7 (114)) ◽  
Author(s):  
Volodymyr Cherniuk ◽  
Roman Hnativ ◽  
Oleksandr Kravchuk ◽  
Vadym Orel ◽  
Iryna Bihun ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Flow Rate ◽  
Calculation Method ◽  
Fluid Motion ◽  
Hydraulic Calculation ◽  
Calculation Methods ◽  
Production Technologies ◽  
The Right ◽  
Longitudinal Slot ◽  
Resistance Coefficients

Most production technologies require a uniform flow path of liquid from pressure distribution pipelines. To achieve this goal, it is proposed to introduce polymer additives into the liquid flow or to use converging distribution pipelines with a continuous longitudinal slot in the wall. To reduce the uneven operation of the distribution pipeline during discrete liquid dispensing, it is proposed to use cylindrical output rotary nozzles with a lateral orthogonal entry of the jet into the nozzle. The problem is the lack of methods for accurate hydraulic calculation of the operation of distribution pipelines. Adequate calculation methods are based on differential equations. Finding the exact solution of the differential equation of fluid motion with variable path flow rate for perforated distribution pipelines is urgent, because it still does not exist. The available calculation methods take into account only the right angles of separation of the jets from the flow in the distribution pipeline. These methods are based on the assumption that the coefficient of hydraulic friction and the coefficient of resistance of the outlets are constant along the flow. A calculation method is proposed that takes into account the change in the values of these resistance coefficients along the distribution pipeline. The kinematic and physical characteristics of the flow outside the distribution pipeline are also taken into account. The accuracy of calculating the value of the flow rate of water distributed from the distribution pipeline has been experimentally verified. The error in calculating the water consumption by the method assuming that the values of the resistance coefficients are unchanged along the distribution pipeline reaches 18.75 %. According to the proposed calculation method, this error does not exceed 6.25 %. However, both methods are suitable for the design of pressure distribution pipelines, provided that the jet separation angles are straight. Taking into account the change from 90° to 360° of the angle of separation of the jets from the flow in the distribution pipeline will expand the scope and accuracy of calculation methods.

Discussion of Hydraulic Calculation Methods for Hot Water Heating Direct Return System

2013 ◽  
Vol 353-356 ◽  
pp. 3049-3053
Author(s):  
Yong Zheng Fu ◽  
Yao Xiong ◽  
Hui Hui Liu
Keyword(s):  
Engineering Design ◽  
Constant Temperature ◽  
Calculation Method ◽  
Temperature Drop ◽  
Hot Water ◽  
Hydraulic Calculation ◽  
Calculation Methods ◽  
Water Heating ◽  
The Common ◽  
Hydraulic Balance

For hot water heating direct return system, the common hydraulic calculation method in engineering design is constant temperature drop method,which is calculated from the farthest riser loop. Due to the limit of the minimum pipe size, the method is usually difficult to achieve the hydraulic balance for every riser loop, and it needs the utilization of valves to meet the need. In this paper, through a calculation example, it has explained that every riser loop is very easy to achieve hydraulic balance without the utilization of valves when the system is calculated from the nearest riser loop. Besides, the calculation order of this method has been given.

Comparation of Numerical Methods for Calculation of Thin Slabs

2014 ◽  
Vol 969 ◽  
pp. 73-77 ◽  
Author(s):  
Oldrich Sucharda ◽  
Jan Kubosek
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Concrete Slabs ◽  
The Finite Element Method ◽  
Thin Slab ◽  
Calculation Methods ◽  
Element Mesh ◽  
Internal Forces ◽  
The Finite Difference Method ◽  
Element Method

The purpose of this paper is to compare calculation of internal forces and deformations of slabs for two calculation methods: the finite element method and the finite difference method. Two concrete slabs have been analysed. In the case of the finite element method, different element mesh are used, providing, thus, solutions in different variants. The calculation and algorithms is based on a thin slab theory. Variants calculate in program Scia Engineer effects of shearing forces by means of the Midlins theory or thin slab theory. Algorithms for the calculation were developed in Matlab.

Optimization of the Geometry of Shafts Using Boundary Elements

1984 ◽  
Vol 106 (2) ◽  
pp. 199-202 ◽  
Author(s):  
C. A. Mota Soares ◽  
H. C. Rodrigues ◽  
L. M. Oliveira Faria ◽  
E. J. Haug
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Programming ◽  
Boundary Element Method ◽  
Optimal Design ◽  
Boundary Elements ◽  
Linearization Method ◽  
Nonlinear Programming Problem ◽  
The Finite Element Method ◽  
Element Method

The problem of the optimization of the geometry of shafts is formulated in terms of boundary elements. The corresponding nonlinear programming problem is solved by Pshenichny’s Linearization method. The advantages of the boundary element method over the finite element method for optimal design of shafts are discussed, with reference to the applications.

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