⟡ Team leader: Prof.  Juan Ma 

⟡ Team members

⟡ Team introduction

There are 7 members in the team, and the certain research results and achievements has been achieved in the multidisciplinary comprehensive optimal design of computational mechanics, applied mechanics, composite material mechanics, structural vibration and reliability analysis, and multi-field coupling structure, and the main branches of dynamics such as experimental mechanics: in the past 5 years, nearly 30 SCI papers have been published as the first author, including Computational Mechanics, Computers & Structures, Physics Letters A, Int. J. Solids and Structures, Int. J.Numerical Method in Engineering, Applied Mathematical Modelling, Mechanical Systems and Signal Processing, and other international authoritative journals of dynamics and other related fields; nearly 10 programs of National Natural Science Foundation of China have been presided or completed. There are1 project of weaponry pre-research fund, and 3 projects of Natural Science Foundation of Shaanxi.And 13 relevant technological invention patents have been applied, including 7 authorization.

In the aspect of cooperation and exchanges, it has established long-term and close scientific research cooperation relationships with teams such as the "calculation and applied mechanics" team of professor Peter Wriggers, Faculty of Mechanical Engineering, Leibniz University Hannover, Germany, the "structural and civil engineering computational mechanics" team of professor WeiGao, the University of New South Wales, Australia, the "smart materials and structural health monitoring" team of professor GangbingSong, Cullen College of Engineering, University of Houston, the United States, the "bionic structural materials and system design" team of professor Francois Barthelat, McGill University, Canada, and the "aerodynamics and flow control" team of professor Tang Hui, Department of Mechanical Engineering, Hong Kong Polytechnic University;  and it has also established good cooperation relationships with domestic well-known colleges and universities such as Lanzhou University, Xi'an Jiaotong University, Northwestern Polytechnical University, and Harbin Institute of Technology; and it has maintained smooth industry-university-research cooperation with institutes such as China Academy of Space Technology, Xi'an Aerospace Power Engine Factory, and CETC-39.

⟡ Talents, important achievements and awards

1.    Alexander von Humboldt Fellow: Juan Ma

2.    Huashan Scholar Specially-appointed Professor : XiangdongXue

⟡ Main research areas

1.   Analysis and calculation of mechanical properties of composite materials

The macroscopic mechanical properties of composite materials under the circumstances of multi-field coupling are more complicated. The homogenization method established on the basis of the multi-scale finite element method establishes an effective connection between the material microstructure properties and the material macroscopic responses, which is a premise and basis for the reliability analysis and optimal design of the structure of subsequent composite materials.

Fig. 1     Lower (left) and upper (right) bounds of energy distribution in the RVE

2.   Reliability design of structures under multi-field coupling

The dynamic response analysis of the mechanical structure under the excitation of multi-field coupling loads of force, heat, and noise, and other dynamic loads is a prerequisite for structural reliability and failure identification; The dynamic reliability-based structural optimization is the ultimate goal and choice of structural design.

Fig.2       Variation of structural fatigue reliability under the heat-structure-noise coupling with the structural parameter randomness and the number of load cycles

3.   Structural vibration analysis and control

Targeted at structures such as aerospace equipment, and ultra-light porous materials, achieve the active and passive control of structural vibration and acoustic radiation based on the piezoelectric transducers, and propose optimization schemes for control parameters.

Fig.3       Multi-mode piezoelectric shunt vibration control of a lattice truss sandwich panel

4.   Nonlinear stochastic dynamics

With precision mechanical and electronic products as the main application objects, research the theories, methods and related software research and development for their optimal design. The research contents include: the electromechanical comprehensive optimization, robustness and reliability optimal design, and so on of electro-mechanical equipment.

Fig.4       Rotor/stator rubbing coefficient and estimation of orbit confidence intervals under random excitation

5.   Engineering optimal design

With precision mechanical and electronic products as the main application objects, research the theories, methods and related software research and development for their optimal design. The research contents include: the electromechanical comprehensive optimization, robustness and reliability optimal design, and so on of electro-mechanical equipment.

Fig. 5     The structural axial deformation of a reflector antenna (left) and the power pattern before and after optimization under flat conditions (right)

6.   Smart materials and structural health monitoring

Research the physical and mechanical properties of smart materials, and the performance evaluation of intelligent sensing technology and smart materials and structures, and research the damage identification technology and prediction methods of smart structures based on these, and research the active control of intelligent structures to provide guarantee for the health monitoring and safe operation of the structures.

Fig. 6      Diagram for active control of piezoelectric FGM structure

Fig. 7     Modal comparison before and after structural damage

7.   Topology optimization design of bionic structural materials

With the bionic structural system as the research object, apply the theories and methods of the topology optimization design of continuum structures to carry out the overall layout design of the multiphase (bionic) material structures. Based on the variable density method, propose an asymptotically concentrated topology optimization method based on the solid isotropic material with logistic function (SIMLF), and carry out numerical simulation to the topology optimization of multi-material structures with the method proposed.

Fig. 8      Topology optimization design of two-material multi-load bridge structure under the completely asymptotic concentration (left) and incomplete asymptotic concentration (right) methods

⟡ Doctor/Master Admissions (please refer to the Admissions Information for details)