Transient dynamic analysis of a pump-turbine with hysteresis effect

2020 ◽  
Vol 34 (12) ◽  
pp. 2050125
Author(s):  
Peng-Cheng Guo ◽  
Hao Zhang ◽  
Long-Gang Sun
Keyword(s):  
Transient Process ◽  
Dynamic Characteristics ◽  
Time Delays ◽  
Hysteresis Effect ◽  
Transient Dynamic Analysis ◽  
Pump Turbine ◽  
Transient Model ◽  
New Approach ◽  
Simulation Based ◽  
Static Operation

Hysteresis effect, which has a significant impact on transient characteristics of a pump-turbine, attracts more and more researchers’ attention and shows great potential. Influences of hysteresis on dynamic characteristics of a pump-turbine are investigated during the transient process in this paper. Transient trajectories of pump-turbines actually do not match their static operation trajectories, especially in the condition of turbine braking. In order to establish a transient model of a pump-turbine in different moving directions of dynamic trajectories, time delays among the relative parameters are introduced in this paper. Furthermore, effects of hysteresis on the dynamic characteristics of the pump-turbine are analyzed in detail by using numerical simulation. Based on the established transient model, influences of unit head on the dynamic characteristics of the pump-turbine are studied during the bidirectional transient process. The simulation results show the transient characteristic of the pump-turbine can be improved with the enhancement of hysteresis effect. While it gradually loses stability with the increase of hysteresis. The conclusions provide us a new approach for regulating the transient performance and stability of pump-turbines by using hysteresis effect during transient process.

Simulation Based Acquisition: A New Approach

1998 ◽  
Author(s):  
Michael V. Johnson ◽  
Mark F. McKeon ◽  
Terence R. Szanto
Keyword(s):  
New Approach ◽  
Simulation Based

A New Approach for a Simulation-Based Prediction of Torsional Chatter in Deep Hole Drilling With Extra-Long Twist Drills

2013 ◽  
Author(s):  
E. Abele ◽  
D. Schäfer
Keyword(s):  
General Structure ◽  
Cutting Parameters ◽  
Torsional Stiffness ◽  
Hole Drilling ◽  
New Approach ◽  
Process Dynamics ◽  
Chatter Vibrations ◽  
Simulation Based ◽  
High Level ◽  
Twist Drills

Numerous investigations work on torsional chatter vibrations in drilling. Particularly in terms of productivity, torsional chatter is detrimental because of a reduction of tool life and an undesirably high level of noise emissions due to the increased process dynamics. To achieve a deeper understanding of the process dynamics, a new numerical simulation model was developed to predict torsional chatter for extra-long twist drills. It is used to determine the influence of numerous factors such as cutting parameters, drill torsional stiffness, rotary moment of inertia and torsional-axial coupling. In this paper, the general structure of the model and the tool model is presented.

scholarly journals A new approach to non-fragile state estimation for continuous neural networks with time-delays

2016 ◽  
Vol 197 ◽  
pp. 205-211 ◽  
Author(s):  
Fan Yang ◽  
Hongli Dong ◽  
Zidong Wang ◽  
Weijian Ren ◽  
Fuad E. Alsaadi
Keyword(s):  
Neural Networks ◽  
State Estimation ◽  
Time Delays ◽  
New Approach ◽  
Fragile State ◽  
Continuous Neural Networks

scholarly journals Evolutions of guide vane moment of a pump-turbine during runaway transient process after pump trip

2019 ◽  
Vol 240 ◽  
pp. 072033 ◽  
Author(s):  
Z Y Yang ◽  
Y G Cheng ◽  
L S Xia ◽  
W W Meng ◽  
L W Gao ◽  
...  
Keyword(s):  
Transient Process ◽  
Guide Vane ◽  
Pump Turbine

Risk Evaluation by Human Trajectory Simulation Based on Real Data

2011 ◽  
Vol 15 (2) ◽  
pp. 220-225
Author(s):  
Kiyoshi Izumi ◽  
◽  
Yoshifumi Nishida ◽  
Yoichi Motomura ◽  
Keyword(s):  
Risk Evaluation ◽  
Real Data ◽  
Public Spaces ◽  
Layout Design ◽  
Sensor Data ◽  
Agent Based Simulation ◽  
New Approach ◽  
Agent Based ◽  
Trajectory Simulation ◽  
Simulation Based

This paper proposes a new approach integrating the modeling of moving persons from sensor data and agent-based simulation for indoor layout design viewed from preventing children’s accidents. Our model focuses on interaction between indoor objects and children to estimate the risk of indoor accidents. We discuss the agent-based simulation of multiple persons moving in public spaces and its application to evaluating information presentation for guidance.

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