Jiaying Zhang

Jiaying Zhang
Beihang University (BUAA) | BUAA · School of Aeronautical Science and Engineering

PhD

About

33
Publications
7,838
Reads
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160
Citations
Introduction
Dr. Zhang is an associate professor in Beihang University. Before joining Beihang, he was a postdoc at the Zienkiewicz Centre for Computational Engineering, Swansea University. Jiaying does research in Aerospace Engineering, Control Systems Engineering and Mechanical Engineering. Their current project is 'Shape Adaptive Blades for Rotorcraft Efficiency.' https://www.researchgate.net/project/SABRE-Shape-Adaptive-Blades-for-Rotorcraft-Efficiency Personal Web: http://jiaying-zhang.com/
Additional affiliations
September 2017 - December 2020
Swansea University
Position
  • PostDoc Position
October 2014 - September 2017
University of Glasgow
Position
  • PhD Student
April 2014 - September 2017
University of Strathclyde
Position
  • PhD Student

Publications

Publications (33)
Article
Multistable phenomenon have long been used in mechanism design. In this paper a subset of unstable configurations of a smart structure model will be used to develop energyefficient schemes to reconfigure the structure. This new concept for reconfiguration uses heteroclinic connections to transition the structure between different unstable equalener...
Article
Aiming to verify the concept of using heteroclinic connections to reconfigure smart structures, a multistable buckled beam with integrated Shape Memory Alloy (SMA) wires is utilized as a high fidelity model. The Shape Memory Alloy (SMA) wires are resistively heated to provide the actuation force to stabilize the unstable configuration and transitio...
Article
Full-text available
The phenomenon of bi-stable behaviour has been widely used in the structural design, as it can provide large deformation by switching between two stable equilibrium positions. This paper aims to investigate the intrinsic nonlinear dynamic characteristics of an actively controlled bistable beam using a simplified spring-mass model. The dynamic model...
Article
Full-text available
Morphing aircraft structures usually introduce greater compliance into aerodynamic sections, and therefore will affect the aeroelasticity with the potential risk of increased flutter. A low-fidelity model of an active camber morphing wing and its aeroelastic model are developed in order to investigate the potential critical speed by exploiting its...
Article
Full-text available
The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative stiffness mechanism. This uses a cable connected with a pre-tension spring to convert decreasing spring...
Article
Full-text available
The present study performs a set of static tests to demonstrate a novel passive morphing concept. The concept introduces a bend-twist coupled composite spar to rotor blades, allowing for twist morphing to be achieved by imposing a lagwise bending moment using centrifugal forces produced by a movable mass at the blade tip. First, three composite spa...
Conference Paper
View Video Presentation: https://doi.org/10.2514/6.2022-0172.vid A common issue with morphing structures is that the actuators must work against significant structural and aerodynamic stiffness. The concept of Passive Energy Balancing (PEB) aims to ameliorate this, and thereby reduce system mass, by connecting negative stiffness elements to the act...
Article
Full-text available
With increasing demand for rotor blades in engineering applications, improving the performance of such structures using morphing blades has received considerable attention. Resonant passive energy balancing (RPEB) is a relatively new concept introduced to minimize the required actuation energy. This study investigates RPEB in morphing helicopter bl...
Preprint
Full-text available
With increasing demand for rotor blades in applications such as wind turbines, helicopters, and unmanned aircrafts , improving the performance of such structures using morphing blades has received considerable attention. Resonant passive energy balancing is a relatively new concept introduced to minimize the required actuation energy. This study in...
Article
Full-text available
A novel passive twist morphing concept is examined for helicopter blades. The concept is demonstrated using a thin-walled rectangular composite beam created with symmetric layup to obtain bend-twist property. The twist of a rotor blade is proposed to be actuated though a movable mass at the blade tip which is able to provide a range of lagwise bend...
Article
Full-text available
A passive energy balancing concept for linear actuation is investigated in the current work by adopting a negative stiffness mechanism. The proposed negative stiffness mechanism uses a pre-tensioned spring to produce a passive torque and therefore to transfer the passive torque through a crankshaft for linear motion. The proposed passive energy ba...
Article
Full-text available
A novel meta-material has been designed and implemented into a rotor blade to enhance aerodynamic efficiency by achieving a passive twist during rotation. The twist is induced by bend-twist coupling exhibited in the meta-material, which is created to possess anisotropic elastic properties at the bulk level. A concept design of a rectangular blade s...
Conference Paper
Full-text available
A spiral pulley based mechanism is used to passively balance the energy between the morphing structure and actuation system. Applying the energy balancing concept has the potential to improve the performance of the actuation system by reducing the external energy consumption. In the current study, the energy balancing concept is adopted in a morphi...
Conference Paper
Full-text available
This paper presents the initial performance analysis of a twist morphing concept based on moving a mass in the chordwise direction in hovering flight. The blade structure is considered to be made of composite materials with bend-twist coupling present in the layup. The chordwise movement of the added mass introduces an additional lag moment along t...
Conference Paper
Full-text available
The actuation system of morphing aircraft plays an important role in any promising morphing design. If the structure of the morphing wing needs to be deformed elastically, the actuation system will be required to provide an adequate actuation force while the weight and cost added to the morphing aircraft should be limited to the extent that the per...
Conference Paper
Full-text available
Traditional ways to achieve the desired motion of mechanisms or deformation of morphing structures require external energy for actuation. Frequently the use of these actuators to drive the system can cost noteworthy energy for each cycle of operation and the spent energy cannot be recovered. This work investigates a passive energy balancing concept...
Article
In this paper, the effect of various parameters of a specific rotor blade cross-section on the effectiveness of a twist morphing concept is investigated. Then, by considering different constraints, a cross-section consistent with this morphing concept with high lag-twist coupling and low extension-twist, is developed. This lag bending-torsion coupl...
Data
An active (heated) SMA wire driven bistable beam is established based on a polynomial constitutive equation to describe the thermomechanical behaviour of the shape memory alloy. The actively controlled bistable beams are designed, fabricated and experimentally tested to achieve the morphing behaviour snapping-through form one position to another.
Article
In this paper, the aeroelastic stability of a composite hingeless rotor blade with a chordwise movable mass is investigated. The point mass is located near the tip of the blade and its chordwise location is variable with respect to the elastic axis and can be moved during the flight. This movable mass is added to the blade to actuate the blade twis...
Article
In this paper, a new concept for morphing composite blades is proposed, and how this concept changes the twist distribution of the blade is explained. A change in the blade twist is obtained by adding a mass to the blade that produces an extra centrifugal force. This centrifugal force then may produce a moment that can change the blade twist via th...
Article
Full-text available
A new concept of an integrated bidirectional torsional negative stiffness mechanism is introduced which allows for passive energy balancing of mechanical systems by reducing actuation requirements and improving energy efficiency. This novel design is a modular device, is bidirectional and is easily integrated and customised for different applicatio...
Conference Paper
Full-text available
In this paper, a systematic and reliable approach is presented to design a composite rotor blade cross-section with high in-plane bending-torsion coupling. The composite blade is designed to allow changing of the twist of the blade in flight, actuated by a moving proof mass near the tip of the blade. By shifting the mass along the chord of the blad...
Conference Paper
Full-text available
Traditional morphing concepts require external energy input to achieve the desired changes to the shape of aircraft structures, often working against the inherent stiffness of these structures. This can lead to a requirement for large actuators, and a significant negative impact on system level performance due to the added mass and energy requireme...
Conference Paper
Full-text available
This paper presents a new concept of morphing by changing the twist of a composite blade through the movement of a mass near the tip of the blade. The mass is moved in the chordwise direction which then modifies the centrifugal force near the tip of the blade. The blade is tailored with composite materials and hence coupling is introduced. By movin...
Conference Paper
Full-text available
The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative stiffness mechanism. This uses a cable connected with a pre-tension spring to covert decreasing spring f...
Article
Full-text available
A reconfigurable smart surface with multiple equilibria is presented, modelled using discrete point masses and linear springs with geometric nonlinearity. An energy-efficient reconfiguration scheme is then investigated to connect equal-energy unstable (but actively controlled) equilibria. In principle zero net energy input is required to transition...
Conference Paper
In this paper an investigation of a new formulation for active vibration control, which based on the optimal positions of piezoelectric sensors. The free vibration and modal properties are derived from the classical plate theory by using finite element method. A criterion is proposed to optimise the location of piezoelectric patches based on the ob...
Article
Linkage mechanisms are perhaps the simplest mechanical structures in engineering, but they can exhibit significant nonlinearity which can in principle be exploited. In this paper a simple smart structure model is developed based on such nonlinearity to investigate the reconfiguration of a four-bar mechanism through phase space connections. The cent...
Article
A new method is investigated to reconfigure smart structures using the technique of polynomial series to approximate a true heteroclinic connection between unstable equilibria in a smart structure model. We explore the use of polynomials of varying order to first approximate the heteroclinic connection between two equal-energy, unstable equilibrium...
Conference Paper
Several new methods are proposed to reconfigure smart structures with embedded computing, sensors and actuators. These methods are based on heteroclinic connections between equal-energy unstable equilibria in an idealised spring-mass smart structure model. Transitions between equal-energy unstable (but actively controlled) equilibria are considered...
Article
This paper presents an investigation of the optimal placement of piezoelectric actuators for the active vibration control of smart structures. Base on the state space equation and the controllability Grammian matrix, a new optimal target is set by the energy efficiency of the input energy. A finite element analysis (FEA) is employed to analyze the...

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Projects

Project (1)
Project
SABRE is a large, multi-partner H2020 research project funded by the European Union. The project team includes the University of Bristol, CIRA, DLR, TU Delft, TU Munich, and Swansea University. It is being coordinated by Dr. Benjamin Woods (Bristol) and has a budget of €6M over 3.5 years. Investigating six morphing concepts that allow for shape adaptation and real-time optimisation of key rotor design parameters, with the potential to apply multiple concepts on a single blade to minimise emissions. Industry Impact • Supporting the long-term health of the EU rotorcraft industry • Improved aerodynamic efficiency of the rotor over a wide range of flight conditions - reducing fuel burn, CO2 and NOx emissions by 5-10% • Lower fuel costs = more competitive products Broad Reach • The technologies and analysis tools developed will be useful in other industries, including commercial airliners and wind turbines. SABRE is developing ground-breaking new helicopter blade morphing technologies which will reduce helicopter fuel burn, CO2, NOx and noise emissions by 5-10%. We will do this by tackling one of the most fundamental limitations on helicopter performance: the need for rotor blades to have a single fixed geometry which is inherently a compromise between widely different operating conditions. SABRE envisions shape adaptive blades continuously changing their shape to optimise performance in all conditions. Morphing technologies are being developed that can change the twist, camber, chord, and dynamic behaviour of helicopter blades. In parallel, analysis work combines comprehensive, mixed-fidelity rotor models with morphing mechanism and emissions models to create the most detailed and comprehensive model of its type.