scholarly journals Transient Response Analysis of Multi-layer Sloshing Fluid in LNG Tank

2021 ◽  
Vol 2076 (1) ◽  
pp. 012024
Author(s):  
Liye Song ◽  
Jiajia Deng ◽  
Jinshu Lu ◽  
Bin Wang ◽  
Dawen Xue
Keyword(s):  
Dynamic Simulation ◽  
Fluid Layer ◽  
Response Analysis ◽  
Interface Behavior ◽  
Wave Characteristic ◽  
Transient Response Analysis ◽  
Dynamic Simulation Model ◽  
Simulation Results ◽  
Lng Tank ◽  
Over Time

Abstract The stratified LNG is the potential cause of rollover, so the analysis of the interface behavior is very important. In this work, a three-layer dynamic simulation model of BOG, LNG, and liquid nitrogen of sloshing stratified LNG in a tank was built. The transient behaviors of the layers were simulated, and the effects of factors such as the period of sloshing (T = 0.2, 0.4, 0.6, 0.8 and 1.0 s) and the amplitude of sloshing (A=0.01~0.06 rad) were analyzed. It was found that instability of the interface was aggravated over time. There was a specific period of sloshing in which the layers of fluid were relatively stable, away from this period the fluid layer became less stable. The influence of sloshing amplitude on the behavior of the interface presented a wave characteristic. The simulation results of the coupling with different sloshing periods and sloshing amplitude showed that the interface behavior of stratified sloshing was the most severe when the sloshing period was 0.2 s and the sloshing amplitude was 0.05 rad.

Improvement of Dynamic Models of Photovoltaic Arrays

2013 ◽  
Vol 419 ◽  
pp. 761-767
Author(s):  
Ji Nan Quan ◽  
Guang Yu Zhou ◽  
Chun Yan Chen
Keyword(s):  
Ambient Temperature ◽  
Dynamic Simulation ◽  
Control Strategy ◽  
Dynamic Models ◽  
Photovoltaic Cell ◽  
Nonlinear Characteristic ◽  
Photovoltaic Array ◽  
Photovoltaic Arrays ◽  
Dynamic Simulation Model ◽  
Simulation Results

The nonlinear characteristic of photovoltaic cell following changes of irradiation and ambient temperature must be solved to research solar energy deeply and to utilize it high-efficiently. For building simple and practical dynamic simulation model and seeking after control strategy for raising out-power, a modified dynamic model of photovoltaic array is developed based on the physical model of photovoltaic cell, in which the voltage and current coefficients about ambient temperature and irradiation are introduced. By the model with stronger applicability and generality, the photovoltaic array I-V characteristic can be simulated arbitrarily with changes of irradiationambient temperaturephotovoltaic module parameter and its combination. The validity of the model is verified by all of the simulation results under Matlab/Simulink.

scholarly journals An Analysis of U.S. Dairy Policy Deregulation using an Imperfect Competition Model

1994 ◽  
Vol 23 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Nobuhiro Suzuki ◽  
Harry M. Kaiser ◽  
John E. Lenz ◽  
Olan D. Forker
Keyword(s):  
Dynamic Simulation ◽  
Imperfect Competition ◽  
Competition Model ◽  
Differential Model ◽  
Dairy Policy ◽  
Simulation Results ◽  
Relative Differences ◽  
Milk Market ◽  
The U.S ◽  
Over Time

An imperfect competition model of the U.S. milk market is developed for analyzing the impacts of dairy policy deregulation. Estimated degree-of-competition parameters indicate that the U.S. milk market has become more competitive over time. The usefulness of the model is demonstrated by showing the relative differences of dynamic simulation results of the imperfect competition model with the results of a conventional exogenous fluid differential model.

Development of dynamic simulation model of LNG tank and its operational strategy

Energy ◽  
2021 ◽  
Vol 223 ◽  
pp. 120060
Author(s):  
Yeonpyeong Jo ◽  
Kyeongseok Shin ◽  
Sungwon Hwang
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
Operational Strategy ◽  
Dynamic Simulation Model ◽  
Lng Tank

Inertial Piezoelectric Micro Rotary Actuator

2012 ◽  
Vol 487 ◽  
pp. 208-211
Author(s):  
Jian Ming Wen ◽  
Ji Jie Ma ◽  
Zhong Hua Zhang ◽  
Guang Ming Cheng ◽  
Jun Wu Kan
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
Simulation Analysis ◽  
Angular Speed ◽  
Sine Wave ◽  
Rotary Actuator ◽  
Dynamic Simulation Model ◽  
Piezoelectric Stacks ◽  
Simulation Results ◽  
Good Agreement

A newly inertial piezoelectric rotary actuator is proposed based on controlling the orderly changes of friction force between the rotator and supporting faces in mechanical way. The dynamic simulation model of the actuator is derived. A prototype small inertial rotary actuator characterized by two symmetric piezoelectric stacks has been fabricated based on the proposed method. The actuator can rotate when it is powered with a square-wave or sine-wave voltage. The experimental and simulation results show that its angular speed is proportional to both the driving voltage’s amplitude and the frequency. The experimental results also show good agreement with the simulation analysis.

scholarly journals An Enhanced Dynamic Simulation Model of a Hybrid Magnetic Bearing Taking Account of the Sensor Noise

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1116 ◽  
Author(s):  
Dawid Wajnert ◽  
Jan K. Sykulski ◽  
Bronislaw Tomczuk
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Dynamic Simulation ◽  
Electric Circuit ◽  
Magnetic Bearing ◽  
Calculation Model ◽  
Object A ◽  
Control Signals ◽  
Dynamic Simulation Model ◽  
Simulation Results

The paper presents simulation and experimental verification of the hybrid magnetic bearing (HMB) performance characteristics. It has been demonstrated that the additional errors from the eddy current sensors have a significant impact on the control signals. An improved mathematical model combines a nonlinear magnetic equivalent circuit of the HMB with the ordinary differential equations of its transients. These equations describe the rotor motion and the electric circuit of the system, as well as the control system required for stable levitation of the rotor. Certain harmonics have been observed in the displacement signals of frequencies equal to the multiples of the cylinder rotations. The calculation model has, therefore, been improved, taking into account the interference of the harmonics. Simulation results were validated by comparing the time responses of the transients obtained from the numerical calculations with those measured on a real object; a satisfactory agreement between the results has been achieved.

Dynamic Simulation of Crank-Group Driving Mechanism with Clearance

2015 ◽  
Vol 9 (1) ◽  
pp. 950-953
Author(s):  
Liu Yansong ◽  
Cao Jujiang ◽  
Cai Dongfei
Keyword(s):  
Angular Velocity ◽  
Dynamic Simulation ◽  
Dynamic Characteristics ◽  
Driving Mechanism ◽  
Motion Simulation ◽  
Dynamic Simulation Model ◽  
Simulation Results ◽  
Processing Errors ◽  
Stiffness And Damping ◽  
The Mathematical Model

For the crank-group driving mechanism, the assembly clearances can offer the possibility to remove overcoming processing errors. But the clearances inevitably affect the dynamic characteristics of the mechanism. In this paper, the dynamic simulation model of the crank-group driving mechanism is established by NX/Motion Simulation which is based on the mathematical model of planar link mechanism. The comparative analysis is conducted regarding the dynamic characteristics of the mechanism which is influenced by different clearances, different angular velocity, and different damping. The simulation results show that appropriately increasing the angular velocity, increasing stiffness and damping of the components can effectively inhibit the adverse influences of clearance on the dynamic characteristics of the mechanism.

scholarly journals Study on improving three-dimensional dynamic simulation model and equation of flexible fabric

2019 ◽  
Vol 11 (6) ◽  
pp. 168781401985284
Author(s):  
Meiliang Wang ◽  
Mingjun Wang ◽  
Xiaobo Li
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
Material Properties ◽  
Three Dimensional ◽  
Equation Solving ◽  
Study Results ◽  
Essential Properties ◽  
Dynamic Simulation Model ◽  
Novel Model ◽  
Simulation Equation

The use of the traditional fabric simulation model evidently shows that it cannot accurately reflect the material properties of the real fabric. This is against the background that the simulation result is artificial or an imitation, which leads to a low simulation equation. In order to solve such problems from occurring, there is need for a novel model that is designed to enhance the essential properties required for a flexible fabric, the simulation effect of the fabric, and the efficiency of simulation equation solving. Therefore, the improvement study results will offer a meaningful and practical understanding within the field of garment automation design, three-dimensional animation, virtual fitting to mention but a few.

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