A simple PSpice high-frequency dynamic model for discharge lamps

2002 ◽  
Author(s):  
M. Ponce ◽  
J. Arau ◽  
J.M. Alonso
Keyword(s):  
Dynamic Model ◽  
High Frequency

scholarly journals Optimizing parameters for a dynamic model of high-frequency HID lamps using genetic algorithms

DYNA ◽  
2015 ◽  
Vol 82 (189) ◽  
pp. 182-188 ◽  
Author(s):  
Leonardo Cedeño-Rodríguez ◽  
Jaime Paul Ayala ◽  
Susset Guerra Jiménez ◽  
Alexander Fernandez-Correa
Keyword(s):  
Genetic Algorithms ◽  
Dynamic Model ◽  
High Frequency ◽  
Hid Lamps

High frequency vibration analysis of ball bearings under radial loads

2016 ◽  
Vol 230 (4) ◽  
pp. 579-588
Author(s):  
Yang Zhao ◽  
Guihua Dong ◽  
Heng Liu ◽  
Fengtao Wang ◽  
Meng Li ◽  
...  
Keyword(s):  
Dynamic Model ◽  
High Frequency ◽  
Vibration Amplitude ◽  
Ball Bearing ◽  
High Frequency Vibration ◽  
Rotating Speed ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
Bearing Load

The paper investigates the role of radial load and rotating speed on the high frequency vibration of a deep groove ball bearing. Firstly, a bearing dynamic model with 6-DOF balls was established, considering the interactions between balls, races and the cage. The dynamic model was solved by fourth order varying steps Runge-Kutta integration. The frequency spectrums of dynamic response of races were analyzed with yule-walker and FFT. Secondly, a verification experiment was done with different radial loads and speeds. Finally, compared with the numerical and experimental results, the similar trend of the high frequency vibration was emerged. Higher vibration frequencies result with increasing bearing load; higher vibration amplitude cause by more quickly rotating speed. That is because the nature frequencies of the races are excited by the contact and shock between balls and races when balls leave from the non-load to the load zone. The frequency spectrums were also affected by the interaction between the balls and cage.

Jitter Transmission Analysis and Experimental Research for Frame Structure in the Median and High Frequency Regions

2012 ◽  
Vol 271-272 ◽  
pp. 981-985
Author(s):  
You Yi Wang ◽  
Yang Zhao ◽  
Wen Lai Ma
Keyword(s):  
Dynamic Response ◽  
Frequency Response ◽  
Dynamic Model ◽  
Experimental Research ◽  
High Frequency ◽  
Low Frequency ◽  
Frame Structure ◽  
Wave Method ◽  
Simulation Results ◽  
Theoretical Results

Frame structure is widely used in practical projects. For jitter of the frame structure excited by median and high frequency disturbances, firstly, the dynamic model of thin plate substructure is built by wave method, and then the dynamic model of frame structure is established by combining wave method and substructure technique. At last, the accurate dynamic response was obtained. The simulation of dynamic characteristic is made, and simulation results are compared with FEM results. On this basis, modal experiment and frequency response experiment is done to verify theoretical results. In comparison to FEM, the results by wave method are accurate in low frequency regions, and the results are more accurate in the median and high frequency regions. The experiment proves wave method is correct and effective for jitter transmission analysis of frame structure in the median and high frequency regions.

High-Frequency Dynamic Model of a Pre-Loaded Circular Dielectric Electro-Active Polymer Actuator

2013 ◽  
Author(s):  
Micah Hodgins ◽  
Gianluca Rizzello ◽  
Alex York ◽  
Stefan Seelecke
Keyword(s):  
Dynamic Response ◽  
Dynamic Model ◽  
High Frequency ◽  
Natural Frequencies ◽  
Mechanical Coupling ◽  
Polymer Actuator ◽  
Validation Tests ◽  
Future Work ◽  
Force Displacement ◽  
Good Agreement

In this work a high-frequency dynamic model of a pre-loaded circular DEAP actuator is developed and experimentally validated. The model is capable of predicting both the static and dynamic response of the actuator. The static response is modeled based on a free energy approach and consists of an Ogden term representing the elastic energy, and a electrical term representing the electrical-mechanical coupling [1]. The addition of viscoelastic elements (spring-dashpot configurations) enables the model to capture the dynamic response. The Ogden coefficients were first identified through a quasi-static force-displacement test of the actuator. A series of validation tests of the actuator at various pre-loads and voltage frequencies showed the model to be in good agreement with the experiments. The model is shown to accurately predict the actuators observed natural frequencies as the pre-deflection and the stiffness of the spring were changed. Future work will include additions to the model to account for relaxation and creep inherent in DEAP material.

Vibration Characteristics for Planetary Geared Systems with Plastic Gears

2015 ◽  
Vol 713-715 ◽  
pp. 77-84
Author(s):  
Jian Ying Li ◽  
Qing Chun Hu ◽  
Fu Hai Duan
Keyword(s):  
Dynamic Model ◽  
High Frequency ◽  
Vibration Characteristics ◽  
Experimental Results ◽  
Frequency Spectra ◽  
Gear Mesh ◽  
Runge Kutta Method ◽  
Variable Step ◽  
Planet Gear ◽  
Plastic Gears

A torsional dynamic model and testing model for planetary geared systems are established to study the effects on its vibration characteristics as substituting plastic gears for steel ones successively. The dynamic model is solved by using variable step Runge-Kutta method and the vibration testing experiments for four kinds of combined planetary geared systems are carried out under different rotation speed and load torque. The numerical and experimental results show that the high frequency spectra are suppressed effectively as substituting plastic gears for steel ones. The gear mesh dynamic load and vibration intensity caused by the meshing fundamental frequency and side-frequency reduce markedly when the plastic ring and planet gear substitute for steel ones together. The numerical simulations have a better consistency with the experimental results, which verifies the correctness of the conclusions.

Research on Damping and Vibration Characteristic of the Large and Precision NC Rotary Table

2010 ◽  
Vol 97-101 ◽  
pp. 1216-1222 ◽  
Author(s):  
Chun Jian Yu ◽  
Xiao Diao Huang ◽  
Cheng Gang Fang ◽  
Ke Fang Dai
Keyword(s):  
Cutting Force ◽  
Dynamic Model ◽  
Friction Force ◽  
High Frequency ◽  
Coulomb Friction ◽  
Vibration Characteristic ◽  
Rotary Table ◽  
Online Test ◽  
Cutting Chatter ◽  
Coulomb Friction Force

According to the current situation of acicular chip and high-frequency chattering of the NC rotary table while gear milling, rigidity and damping performances of the table were analyzed and the damping program of Coulomb friction was bring up. Online test of the gear milling cutting force can be used to establish dynamic model of circumferential vibration of the table with Coulomb friction. Then mechanism of restraining gear cutting chatter by damping of Coulomb friction and acicular chip generating mechanism were exposed. Furthermore, relationship between backlash and rotary rigidity of the table was also analyzed. A kind of floating apparatus with friction damping was designed to optimize circumferential damping of the table by adjusting Coulomb friction force, which reduces the influence of high-frequency chattering on gear milling. As a result, efficiency of gear milling was increased 1.5 times and the noise was reduced from 105dB to 91dB.

Flywheel Energy Storage Used in Enhancing the Construction Machinery Engine Speed Stability

2010 ◽  
Vol 34-35 ◽  
pp. 1881-1885
Author(s):  
Hai Rong Gu ◽  
Sheng Jie Jiao ◽  
Chong Yu Xiao ◽  
Yi Min Liu ◽  
Fu Chun Wang
Keyword(s):  
Energy Storage ◽  
Energy Loss ◽  
Dynamic Model ◽  
High Frequency ◽  
Engine Speed ◽  
Flywheel Energy Storage ◽  
Experiment Data ◽  
Construction Machinery ◽  
Speed Stability ◽  
Storage Energy

To study the flywheel storage energy in enhancing the construction machinery engine speed stability, Dynamic model on engine and engine connecting another flywheel is established. With a group of experiment data, load changing effecting the engine speed is compared when the storage energy flywheel is assembled and not. The results indicate that high frequency engine speed fluctuating is less when the storage energy flywheel is assembled, the drive and economy performance is better, and added energy loss is only for friction.

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