1. Structural Dynamics Analysis: Program Designing And Applications

2. Resume From School of Jet Propulsion, Master degree of BUAA
Research Interests: Dynamics of piezoelectric structures and dry friction systems.
Program languages: C, C++, C#, Python, JAVA, VB, APDL, MATLAB, UDF of Fluent
Internship experiences
2011.3~ : as general-webmaster
2009.3~.6: ANSYS-CHINA, as UDF developer of Fluent 6.3x
2009.5~.9: Beijing HuaHong IC design company, as software engineer
2008.7~.9: Volunteer of Beijing Olympic games
Paper Presentation
Li Lin, Fan Yu. Molding surface design of membranous disc couplings based on fatigue life analysis [J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS, 2010,V36(12):
Fan Yu, Li Lin. Dynamic analysis of aircraft overrun arresting system [C]. 8th GRADUATE STUDENTS ACADAMIC FORUM OF BEIHANG UNIVERSITY (Submitted)
Fan Yu, Li Lin. Self-powered vibration-control behavior of piezoelectric networks [J]. ADVANCES IN ACOUSTICS AND VIBRATION (Submitted)
FAN YU
2018/6/27

3. Applications of Dynamics Analysis
Fatigue life calculation
Instrument components
Couplings/Gearings
Design method
Actuators/sensors
Smart structures based
on piezoelectric materials
Dynamics Analysis
Energy harvesting
Vibration dispassion
Nonlinear behavior
Dry friction Damper
Vibration dispassion
Design method
FAN YU
2018/6/27

4. Dynamics analysis program Introduction
As a group of application interfaces based on Python 2.6x
Functions
Transient and stationary response of dynamics equations:
Can consider nonlinear affects.
With Newmark method & central difference method.
Can Import matrix exported from ANSYS.
Can give the DFT results of transient response.
All results can be given in graphic forms.
FAN YU
2018/6/27

5. Compressed Sparse Column format HB formatted sparse matrix
Dynamics analysis program Test cases & application(1): load matrix from ANSYS
Steps:
Create 2 BEAM elements in ANSYS, with one top constrained, excited in free top.
Export sparse matrix M,K,C and RHS of dynamic equations to the .txt file.
Import sparse matrix from .txt file into my program and extend them to FULL matrix.
Calculating the harmonic response based on ANSYS and my program respectively.
Python Language
Scipy.Sparse library
csc_matrix class
Compressed Sparse Column format
ANSYS mechanics
HB formatted sparse matrix
FAN YU
2018/6/27

6. Dynamics analysis program Test cases &application (2): harmonic analysis of electric network
Amplitude-Frequency
The electric network is constructed by:
resistive elements;
conductive elements;
capacitive elements;
ideal voltage sources.
The dynamics equations can be obtained by:
FEM;
KCL & KVL.
Phase-Frequency
FAN YU
2018/6/27

7. Arresting ratio calculated by different formulas
Evaluating the perform of AOAS Model of aircraft overrun arresting system
Arresting materials
Plane with initial velocity
Arresting forces are:
Arresting ratio calculated by different formulas
Velocity
（m/s）
Linear fit
(Mpa)
Expirical
formula
Experience
result 2
0.4032
0.7757
0.4188 10
0.4362
0.7925
0.4632 20
0.4774
0.8450
0.4717 30
0.5186
0.9325
0.4901
Arresting ratio:
FAN YU
2018/6/27

8. Slipping during whole circle Sticking during whole circle
Dry friction damper of torsional vibration Introduction & Typical working conditions
The principle of dry friction damper:
Normal pressure causes maximum static friction force;
Relative motion happens only when external force become larger than static friction force, then the dynamic friction force occurred at the interface;
Dynamic friction causes some negative work -> damping effects.
Due to different normal pressure, damper and target may:
Contacted too strict to have relative motion; [ No damping]
Contacted too slack to have pauses; [Damping]
Have two pauses per circle under property normal pressure. [Damping]
Slipping during whole circle
Sticking during whole circle
Two pauses per circle
FAN YU
2018/6/27

9. Dry friction damper of torsional vibration Model & simplify
FE model of certain gearing system
1st resonance:
torsional vibration
Mesh detail of
Cross section
Lumped parameter model near 1st resonance
where friction forced is defined by contact status：
FAN YU
2018/6/27

10. Dry friction damper of torsional vibration Analytic solutions & numerical results
Analytic-numerical
comparing
The numerical results are provided by:
FEM (ANSYS mechanics);
Nonlinear routine of my program;
The results are agree with each other.
The analytic solutions are obtained by:
Harmonic balance method (HB1)
Vibration-dispassion
behavior
Best normal
pressure
Best
response
curve
Vibration-dispassion
behavior affected by
normal pressure
FAN YU
2018/6/27

11. Dynamics behavior of piezoelectric structures
Electromechanical coupling characteristics:
Mechanic
displacement
Piezoelectric
layers
Electric
quantity
Self-powered
vibration control
Energy harvesting
Active vibration control
FAN YU
2018/6/27

12. Questions
FAN YU
2018/6/27

13. Software development Dynamic analysis system of membranous couplings (1)
MFC
Win2k+
ANSYS
FAN YU
2018/6/27

14. Software development Dynamic analysis system of membranous couplings (1)
MFC
Win2k+
ANSYS
FAN YU
2018/6/27

15. Software development Electric network analysis tool based on FEM
Win2k+
FAN YU
2018/6/27

16. Software development Heat radiation calculation tool based on Fluent 6
Software development Heat radiation calculation tool based on Fluent 6.3x VB VB
Runtime
Win2k+
FAN YU
2018/6/27

17. For more details, please refer to:
Weibo
Technique Blog: [in Chinese]
Li Lin, Fan Yu. Molding surface design of membranous disc couplings based on fatigue life analysis [J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS, 2010,V36(12): [in Chinese]
Fan Yu, Li Lin. Dynamic analysis of aircraft overrun arresting system [C]. 8th GRADUATE STUDENTS ACADAMIC FORUM OF BEIHANG UNIVERSITY (Submitted) [in Chinese]
Fan Yu, Li Lin. Self-powered vibration-control behavior of piezoelectric networks [J]. ADVANCES IN ACOUSTICS AND VIBRATION (Submitted) [in English]
(The journal paper for dry friction damper is still preparing…)
Thanks!
FAN YU
2018/6/27