Structural Dynamics Analysis: Program Designing And Applications IGSS@2011

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~ : www.chinavib.com, 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): 1480-1484 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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

Questions FAN YU rainyboy@188.com 2018/6/27

Software development Dynamic analysis system of membranous couplings (1) MFC Win2k+ ANSYS FAN YU rainyboy@188.com 2018/6/27

Software development Dynamic analysis system of membranous couplings (1) MFC Win2k+ ANSYS FAN YU rainyboy@188.com 2018/6/27

Software development Electric network analysis tool based on FEM Win2k+ FAN YU rainyboy@188.com 2018/6/27

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 rainyboy@188.com 2018/6/27

For more details, please refer to: Weibo : @范雨BUAA Technique Blog: http://rainyboy.chinavib.com [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): 1480-1484 [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 rainyboy@188.com 2018/6/27