Hasti is a qualified mechanical engineer, research assistant, a PhD candidate and a postgraduate student engagement officer at Women in Engineering and IT (WiEIT) at UTS.
Her current research revolves around understanding the underlying biomechanics of rapid legged locomotion, mainly the foot-surface interaction, via simulation (Spring Loaded Inverted Pendulum method) and experiments (MEMS). She is also interested in the dynamic behaviour of nano-structures such as Carbon Nano Tubes by deploying the cutting edge classical and non-classical theories.
Hasti is member of:
UTS Women in Engineering and IT
UTS Health and Advisory Committee
UTS Research Commitee
UTS FEIT Research Degree Committee
UTS Women in Engineering and IT Committee
> Gait analysis
> Kinetic and Kinematic analysis
> Spring Loaded Inverted Pendulum (SLIP) modelling
> Legged robotics design
> Nonlinear dynamics
Introduction to mechanical and mechatronic engineering
Eager, D & Hayati, H 2019, 'Additional injury prevention criteria for impact attenuation surfacing within children's playgrounds', ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part B: Mechanical Engineering, vol. 5.View/Download from: UTS OPUS or Publisher's site
Hayati, H, Eager, D & Walker, P 2019, 'The effects of surface compliance on greyhound galloping dynamics', PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART K-JOURNAL OF MULTI-BODY DYNAMICS, vol. 233, no. 4, pp. 1033-1043.View/Download from: UTS OPUS or Publisher's site
Hayati, H, Hosseini, SA & Rahmani, O 2017, 'Coupled twist–bending static and dynamic behavior of a curved single-walled carbon nanotube based on nonlocal theory', Microsystem Technologies, pp. 1-9.View/Download from: UTS OPUS or Publisher's site
© 2016 Springer-Verlag Berlin Heidelberg The static and dynamic behavior of a curved single-walled carbon nanotube which is under twist–bending couple based on nonlocal theory is analyzed. The nonlocal theory is used to model the mechanical behavior of structure in small scale. The obtained differential equations are solved using a simply supported boundary condition and Navier analytical method. Moreover the twisted vibration and bending of curved nanotube is analyzed and also the armchair model is assumed in this study. The following parameters were studied in this paper: the effect of nonlocal parameter, the curved nanotube's opening angel, the Young's modulus and the mode number is studied. The results were verified with the previous literature which showed an excellent agreement. The results of this paper can be used as a benchmark for future investigations.
Rahmani, O, Hosseini, SAH & Hayati, H 2016, 'Frequency analysis of curved nano-sandwich structure based on a nonlocal model', Modern Physics Letters B, vol. 30, no. 10.View/Download from: Publisher's site
© 2016 World Scientific Publishing Company. In this paper, we study the vibration of curved nano-sandwich (CNS) with considering the influence of core shear based on the Eringen nonlocal theory. The equation of motion is derived and exact solution for the natural frequencies of CNS is presented. The proposed nonlocal model includes a material length scale parameter that can capture the size effect in CNS beam. The effects of important parameters, such as the thickness to length ratio, nonlocal parameter and mode number on the frequencies of CNS are investigated. The result of our research shows that as the opening angle increases, the amount of natural frequencies decrease. We have additionally validate, our results against previous research works which showed good agreement.
Mahdavi, F, Hayati, H, Kennedy, P & Eager, D 2019, 'Effects of the number of starts on greyhound racing dynamics', International Society of Biomechanics Conference, Calgary, Canada.View/Download from: UTS OPUS
Hayati, H, Eager, D & Walker, P 2019, 'A SLIP Model to predict the dynamics of rapid tetrapod locomotion during hind-leg single support', International Society of Biomechanics Conference, Calgary, Canada.View/Download from: UTS OPUS
Hayati, H, Mahdavi, F & Eager, D 2019, 'A single IMU to capture the fundamental dynamics of rapid tetrapod locomotion: Racing greyhounds', European Society of Biomechanics, Vienna, Austria.View/Download from: UTS OPUS
Hayati, H, Walker, P, Brown, T, Kennedy, P & Eager, D 2018, 'A simple spring-loaded inverted pendulum (SLIP) model of a bio-inspired quadrupedal robot over compliant terrains', Proceedings of the ASME 2018 International Mechanical Engineering Congress and Exposition IMECE2018, International Mechanical Engineering Congress and Exposition, ASME, USA.View/Download from: UTS OPUS or Publisher's site
Copyright © 2018 ASME. To study the impact of compliant terrains on the biomechanics of rapid legged movements, a well-known spring loaded inverted pendulum (SLIP) model is deployed. The model is a three-degrees-of-freedom system (3 DOF), inspired by galloping greyhounds competing in a racing condition. A single support phase of hind-leg stance in a galloping gait is taken into consideration due to its primary function in powering the greyhounds locomotion and higher rate of musculoskeletal injuries. To obtain and solve the nonlinear second-order differential equation of motions, the Lagrangian method and MATLABb R2017b (ode45 solver), which is based on the Runge-Kutta method, has been used, respectively. To get the viscoelastic behavior of compliant terrains, a Clegg hammer test was developed and performed five times on each sample. The effective spring and damping coefficients of each sample were then determined from the hysteresis curves. The results showed that galloping on the synthetic rubber requires more muscle force compared with wet sand. However, according to the Clegg hammer test, wet sand had a higher impact force than synthetic rubber which can be a risk factor for bone fracture, particularly hock fracture, in greyhounds. The results reported in this paper are not only useful for identifying optimum terrain properties and injury thresholds of an athletic track, but also can be used to design control methods and shock impedances for legged robots performing on compliant terrains
Mahdavi, F, Hossain, MI, Hayati, H, Eager, D & Kennedy, P 2018, 'Track Shape, Resulting Dynamics and Injury Rates of Greyhounds', Volume 13: Design, Reliability, Safety, and Risk, International Mechanical Engineering Congress and Exposition, ASME, Pittsburgh, Pennsylvania, USA.View/Download from: UTS OPUS or Publisher's site
Hayati, H, Walker, P, Mahdavi, F, Stephenson, R, Brown, T & Eager, D 2018, 'A Comparative Study of Rapid Quadrupedal Sprinting and Turning Dynamics on Different Terrains and Conditions: Racing Greyhounds Galloping Dynamics', Volume 4A: Dynamics, Vibration, and Control, ASME 2018 International Mechanical Engineering Congress and Exposition, ASME, Pittsburgh, Pennsylvania, USA, pp. 1-7.View/Download from: UTS OPUS or Publisher's site
Identifying optimum athletic race track surfacing for greyhounds to reduce risk of injuries is a challenging practice as there are several single and coupled variables that should be considered as risk factors. To study the impact of bend and straight sections, surface type and camber, on biomechanics of galloping quadrupeds, an inertial measurement unit (IMU).
has been used to measure the associated galloping accelerations. The IMU was sewn into a pocket located on the back of the greyhounds racing jacket positioned between the two forelegs. Simultaneous kinematics were performed using high frame rate (HFR) videos for calibrating IMU data. The results showed that there were lower G-forces on galloping on grass than wet sand which is consistent with the mechanical behavior of grass (grass is softer than wet sand). Moreover, galloping around the bend had higher G-forces than galloping along the straight section suggesting an excessive force is applied on the greyhound's limbs due to centrifugal force. A cambered bend assisted the greyhounds in having a smoother gait and lower G-forces when compared to a flat bend. The results reported in this paper will not only be beneficial for the welfare of racing greyhounds, but will also contribute in the simulation of legged locomotion for bio-inspired engineering and robotics.
Hayati, H, Eager, D, Jusufi, A & Brown, T 2017, 'A Study Of Rapid Tetrapod Running And Turning Dynamics Utilizing Inertial Measurement Units In Greyhound Sprinting', vol 3 Proceedings of the ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conferences, ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conferences ASME IDETC/CIE, ASME, Cleveland, Ohio, USA, pp. 1-5.View/Download from: UTS OPUS or Publisher's site
Understanding the biomechanics of rapid running locomotion plays an important role in comparative biomechanics and bio-inspired engineering and is an integral part of animal welfare.
However, this is not easily achieved using conventional methods of gait analysis: measuring ground reaction forces using a force plate, mainly on irregular granular terrain i.e. greyhounds in racing conditions or in animal's natural habitats i.e. cheetahs in natural terrain. An alternative to measuring forces externally via force platforms embedded in track ways, we can attach inertial measurement units to agile quadrupeds to measure the effects of rapid running and turning.
Here we deployed an IMU equipped with a tri-axial accelerometer on sprinting greyhounds to analyze rapid locomotion behaviors like dynamic banking and turning in conditions equivalent to racing. High speed videography and paw print analysis of the entire race were used for calibration. The results are beneficial in locomotion analysis and welfare of greyhounds
Hayati, H, Eager, D, Stephenson, R, Brown, T & Arnott, E 2017, 'The impact of track related parameters on catastrophic injury rate of racing greyhounds', 9th Australasian Congress on Applied Mechanics, ACAM 2017, Australasian Congress on Applied Mechanics, Engineers Australia, Sydney, Australia.View/Download from: UTS OPUS
© 2017 National Committee on Applied Mechanics. All Rights Reserved. Greyhounds can travel twice as fast as human athletes, attaining constant average running speeds of ~65 km/h vs ~29 km/h. Their locomotion is also different from human sprinters, and more similar to cyclists. Unlike human sprinters where the muscles powering the locomotion are also supporting the weight, locomotion of greyhound are powered by torque about the hip. Agile, high-speed quadrupeds, such as the greyhound, experience extreme ground-limb contact forces while negotiating turns; leading to an increased susceptibility to injuries. Added to this, rapid, high velocity changes in direction and extreme turning angles magnify the lateral acceleration forces experienced on the limbs and torso. In this paper, the rate of severe musculoskeletal injuries of racing greyhounds at 34 tracks in New South Wales, Australia, were obtained for the year of 2016. The correlation of parameters, namely bend radius, bend camber, bend length and back straight length and the catastrophic injury rate are statistically analyzed . Track injury locations were obtained from race video footage No correlation was seen between catastrophic injury rate and bend radius, bend camber, bend length and back straight length. Analyses revealed the highest injury rate based on location to be at the first turn. Footage lends support to this being caused by the immediate clustering of the greyhounds towards the inner 'lure' rail.' The results of this study support previous findings that greyhounds racing in an anti-clockwise direction most commonly suffer musculoskeletal injuries to their right hind limbs which is consistent with knowledge of the forces that occur on the leading limbs of these dogs as they maintain their speed around bends.
Hayati, H, Eager, Jusufi & Brown 2017, 'A NOVEL APPROACH TO ANALYZING RAPID TETRAPOD LOCOMOTION USING INERTIAL MEASUREMENT UNITS', International Society of Biomechanics, Brisbane, Australia.View/Download from: UTS OPUS
Rapid quadrupedal movement on granular media and other irregular terrain is an interesting area of research which is under-explored. Current methods of studying rapid quadrupedal movement involve the measurement of ground reaction forces (GRF) using a force plate and a simultaneous kinematics analysis by a High Frame Rate video (HFR). Although force plates provides highly accurate kinetic data, it is not always practical to deploy in the study of animal locomotion. For instance, it is often not possible to embed force plates in irregular terrains  characteristic of most ecologically relevant animals' natural habitats . An alternative method is to utilize an inertial measurement unit (IMU) equipped with a tri-axial accelerometer to analyze accelerations associated with different quadruped gaits. In this study, a tri-axial accelerometer is used to analyze sprinting locomotion dynamics of a greyhound in a simulated racing condition. Kinematics data from videography of the entire race was recorded in each trial for data calibration. In addition, the paw prints of the greyhound on a sandy-loam surface of a race track are also analyzed to sync acceleration data with each individual paw print.
Jusufi, A, Hayati, HH, Eager, DE & Tucker, BT 2017, 'Exploration of Rapid Sprinting Dynamics of Tetrapod utilizing IMUs', The 8th International Symposium on Adaptive Motion of Animals and Machines (AMAM 2017) Japan.View/Download from: UTS OPUS
Eager, D, Hayati, H & Chapman, C 2016, 'Impulse force as an additional safety criterion for improving the injury prevention performance of impact attenuation surfaces in children's playgrounds', Proceedings of the ASME 2016 International Mechanical Engineering Congress & Exposition IMECE2016, International Mechanical Engineering Congress & Exposition, AMER SOC MECHANICAL ENGINEERS, Phoenix, Arizona, US.View/Download from: UTS OPUS or Publisher's site
Eager, D, Hayati, H, Mahdavi, F, Hossain, MI, Stephenson, R & Thomas, N 2018, Identifying optimal greyhound track design for greyhound safety and welfare-Phase II-Progress Report-1 January 2016 to 31 December 2017, UTS.View/Download from: UTS OPUS
Mahdavi, F, Hayati, H, Thomas, N & Eager, D 2018, Injury rates analysis for races with different number of starts By Fatemeh Mahdavi, Hasti Hayati and Prof David Eager 06 April 2018 University of, UTS.