scholarly journals Derivation of a lumped parameter system model of a flow passage simultaneously modeling resistance and inertia and verification in basic flow passages

2021 ◽  
Vol 52 (1) ◽  
pp. 16-24
Author(s):  
Hiroshi HIGO ◽  
Fumio SHIMIZU ◽  
Kazuhiro TANAKA
Keyword(s):  
Basic Flow ◽  
System Model ◽  
Parameter System ◽  
Flow Passage ◽  
Lumped Parameter

scholarly journals Modeling of ball screw driven stage for drilling machines with lumped parameter system model and FEM model

2016 ◽  
Vol 3 (4) ◽  
pp. 16-00068-16-00068 ◽  
Author(s):  
Hiroki TAKAHASHI ◽  
Toru YUKI ◽  
Kyosuke SUZUKI
Keyword(s):  
System Model ◽  
Ball Screw ◽  
Parameter System ◽  
Fem Model ◽  
Lumped Parameter

Numerical analysis of the resonance mechanism of the lumped parameter system model for acoustic mine detection

2013 ◽  
Vol 22 (12) ◽  
pp. 124601 ◽  
Author(s):  
Chi Wang ◽  
Yu-Qiu Zhou ◽  
Gao-Wei Shen ◽  
Wen-Wen Wu ◽  
Wei Ding
Keyword(s):  
Numerical Analysis ◽  
System Model ◽  
Parameter System ◽  
Mine Detection ◽  
Resonance Mechanism ◽  
Lumped Parameter

Bond Graph Sign Conventions

1975 ◽  
Vol 97 (2) ◽  
pp. 184-188 ◽  
Author(s):  
A. S. Perelson
Keyword(s):  
Graph Model ◽  
Bond Graph ◽  
Equivalence Classes ◽  
Parameter System ◽  
Bond Graphs ◽  
Lumped Parameter ◽  
Oriented Object

The lack of arbitrariness in the choice of bond graph sign conventions is established. It is shown that an unoriented bond graph may have no unique meaning and that with certain choices of orientation a bond graph may not correspond to any lumped parameter system constructed from the same set of elements. Network interpretations of these two facts are given. Defining a bond graph as an oriented object leads to the consideration of equivalence classes of oriented bond graphs which represent the same system. It is also shown that only changes in the orientation of bonds connecting 0-junctions and 1-junctions can lead to changes in the observable properties of a bond graph model.

Preliminary Analysis of Compressor System Designed for Cyclical Operation

2015 ◽  
Author(s):  
Viktor Kilchyk ◽  
Ozhan H. Turgut ◽  
Ahmed Abdelwahab
Keyword(s):  
Boundary Conditions ◽  
Preliminary Analysis ◽  
Operating Conditions ◽  
Time Dependent ◽  
System Model ◽  
Lumped Parameter ◽  
Compressor Performance ◽  
Specific Speed ◽  
Cycle Efficiency ◽  
Effective Design

Conventional methods of the compressor performance analysis do not allow effective design matching to the specific operating conditions of cyclical or unsteady operated machines. Under dynamic loading the actual compressor performance often departs from the best efficiency region reducing its cycle efficiency. This departure may be caused by a number of reasons such as non-controlled deceleration, speed or torque constraints, and rapid boundary conditions variation caused by the cycle operation. In order to analyze this influence of cycle dynamics on compressor performance a modified lumped-parameter compressor-system model was applied. The model included time-dependent boundary conditions, effects of flow compressibility, motor and compressor inertia, and was combined with compressor speed control. The study was performed within the system constrains, e.g. surge avoidance, maximum motor torque and impeller speed. Results of the developed analysis showed that in the presence of rapidly changing boundary conditions the average cycle efficiency is strongly affected by the design specific speed of the compressor.

Design and Modeling of a New Inchworm Linear Motor

2012 ◽  
Vol 562-564 ◽  
pp. 603-606
Author(s):  
Qi Wang ◽  
Bin Tang Yang ◽  
Lan Tao Liu ◽  
Guang Meng
Keyword(s):  
Research Work ◽  
Linear Motor ◽  
Quick Response ◽  
Parameter System ◽  
Cam Mechanism ◽  
Lumped Parameter ◽  
Output Force ◽  
Optimal Contour ◽  
Large Output ◽  
General Dynamic

This paper presents a research work for the design and modeling of a new inchworm linear motor. The three actuators of the motor are based on electromagnetic and permanent magnetic combined drive. The actuator may generate large output force, large displacement and quick response. A permanent magnet cam is designed to realize the continuous and smooth movement for the actuator. The motion equation of the cam mechanism is established and analyzed by SIMULINK from which the optimal contour of the cam may be confirmed. Then the general dynamic model of the linear motor is established with a 4DOF lumped parameter system.

Calculation Method for Thermal-Hydraulic System Simulation

2008 ◽  
Vol 130 (8) ◽  
Author(s):  
Li Chenggong ◽  
Jiao Zongxia
Keyword(s):  
Mathematical Models ◽  
Calculation Method ◽  
Hydraulic System ◽  
System Simulation ◽  
Cross Coupling ◽  
System Model ◽  
Lumped Parameter ◽  
Simulation Results ◽  
Simulation Time ◽  
Hydraulic System Simulation

This paper presents the fundamental approaches of modeling thermal-hydraulic component briefly. A set of lumped parameter mathematical models is developed, which are based on conservation of mass and energy. Subsequently, the connection rule for basic thermal-hydraulic components and the method to automatically generate the complete thermal-hydraulic system model are put forward. The integration methods for solving the cross-coupling thermal-hydraulic equations are also discussed for a position-controlled thermal-hydraulic system. Simulation results show the interaction between pressure and temperature. The simplified representations of thermal-hydraulic differential equations are also proposed in this paper, which can reduce simulation time. The validity of the simplified representations is judged by simulation.

Analysis of Axial Vibration in the Laminated Rubber-Metal Spring

2013 ◽  
Vol 845 ◽  
pp. 46-50 ◽  
Author(s):  
Mohd Azli Salim ◽  
Azma Putra ◽  
Mohd Azman Abdullah
Keyword(s):  
High Frequency ◽  
Axial Direction ◽  
Vibration Isolator ◽  
Axial Vibration ◽  
Parameter System ◽  
Internal Resonances ◽  
Lumped Parameter ◽  
Metal Plates ◽  
Vibration Transmissibility ◽  
Earthquake Protection

The laminated rubber-metal spring is well known in application as the vibration isolator for earthquake protection. The spring is therefore designed to be able to sustain the vibration waves from horizontal direction. This paper discusses the possibility of the laminated spring to be employed for other applications where the excitation mainly comes from axial direction, such as to isolate vibration transmission from heavy engine. The model is first developed for a simple finite rod to simulate the effect of internal resonances at high frequency when the wavelength is much smaller than the length of the rod. The effect of metal plates inserted in the rubber is then modelled using the lumped parameter system. The results are presented in terms of the vibration transmissibility.

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