John Hart

John Hart
Sheffield Hallam University | SHU · Centre for Sports Engineering Research

Mechanical Engineering MEng, PhD

About

31
Publications
22,584
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323
Citations
Additional affiliations
April 2006 - present
Sheffield Hallam University
Position
  • Senior Researcher

Publications

Publications (31)
Article
Full-text available
Traditional body measurement techniques are commonly used to assess physical health; however, these approaches do not fully represent the complex shape of the human body. Three-dimensional (3D) imaging systems capture rich point cloud data that provides a representation of the surface of 3D objects and have been shown to be a potential anthropometr...
Conference Paper
Full-text available
Traditional manual anthropometrics have been used extensively in practice to derive indicators of health risk, such as growth disorders or obesity; however, these approaches typically reduce the complex shape of human bodies to a series of simple size measures. Three-dimensional (3D) imaging systems capture detailed and accurate images of human mor...
Article
Full-text available
Manual anthropometrics are used extensively in medical practice and epidemiological studies to assess an individual's health. However, traditional techniques reduce the complicated shape of human bodies to a series of simple size measurements and derived health indices, such as the body mass index (BMI), the waist-hip-ratio (WHR) and waist-by-heigh...
Article
Purpose: Motor outputs are governed by dynamics organized around stable states and spontaneous transitions: we seek to investigate the swimmers’ motor behavior flexibility as a function of speed and aquatic environment manipulations. Method: Eight elite male swimmers partook an eight-level incremental test (4% increment from 76% to 104% of their me...
Article
KinectFusion is a typical three-dimensional reconstruction technique which enables generation of individual three-dimensional human models from consumer depth cameras for understanding body shapes. The aim of this study was to compare three-dimensional reconstruction results obtained using KinectFusion from data collected with two different types o...
Article
Swimming is a challenging locomotion, involving the coordination of upper and lower limbs to propel the body forward in a highly resistive aquatic environment. During front crawl, freestyle stroke, alternating rotational motion of the upper limbs above and below the waterline, is coordinated with alternating lower limb pendulum actions. The aim of...
Article
Full-text available
The aerodynamics of a feather shuttlecock, a porous conical bluff body, are unique in comparison to other sports projectiles. Experimental wind tunnel studies have been published that present values of drag coefficient (Cd) for traditional feather shuttles that vary widely (0.48 < Cd < 0.74). It is difficult to compare published experimental data,...
Article
Full-text available
In competitive association football, wearing electronic performance and tracking system (EPTS) devices was approved in 2015. Safety concerns regarding their use have been raised; however, research and understanding is limited. Recently, FIFA has taken steps to assess possible injury mechanisms associated with wearing EPTS devices. This study identi...
Article
Full-text available
Displacement in competitive swimming is highly dependent on fluid characteristics, since athletes use these properties to propel themselves. It is essential for sport scientists and practitioners to clearly identify the interactions that emerge between each individual swimmer and properties of an aquatic environment. Traditionally, the two protagon...
Article
Full-text available
Stereo camera systems have been used to track markers attached to a racket, allowing its position to be obtained in three-dimensional (3D) space. Typically, markers are manually selected on the image plane, but this can be time-consuming. A markerless system based on one stationary camera estimating 3D racket position data is desirable for research...
Article
Full-text available
A model was developed to predict the sound of a ball impacting a USGA CoR plate, as a first step towards simulating the acoustics of a ball/driver impact. A ball was dropped from 2.5 m onto a free-free plate with the impact sound recorded with a microphone. The experiment was replicated in Ansys/LS-DYNA, with both the exact Boundary Element Method...
Article
Full-text available
Mechanics is a fundamental topic required for both undergraduate and postgraduate students on engineering and technology courses. It can be difficult to motivate and engage students in the theoretical aspects of the topic, especially if they are without a strong mathematical background. There are many sporting examples that can be used to explain s...
Article
Full-text available
Use of computational fluid dynamics (CFD) in the aerodynamic simulation of sports projectiles has always been a challenge. The majority of these are spherical, classic bluff bodies, which typically experience flow transition during flight, and large flow separations. Current research of such flows is predominantly concentrated on the use of computa...
Article
Gravity racing can be studied using numerical solutions to the equations of motion derived from Newton's second law. This allows students to explore the physics of gravity racing and to understand how design and course selection influences vehicle speed. Using Euler's method, we have developed a spreadsheet application that can be used to predict t...
Article
Full-text available
This paper presents a study in the simulation and understanding of the aerodynamic characteristics of a badminton shuttle, using Computational Fluid Dynamics. Modeled shuttle geometry was based upon a high quality synthetic shuttle, a Yonex Mavis 370. The study investigated the use of Reynolds Averaged Navier Stokes (RANS) simulation in comparison...
Article
Full-text available
Discus, disc golf and ultimate Frisbee are all sports that utilise rotating disc projectiles. The aim of this study was to use computational fluid dynamics (CFD) examine the flow over a disc and in doing so determine which CFD model is most suited to examining the aerodynamics of sports disc projectiles. All of the CFD analysis was carried out usin...
Article
Full-text available
There are a number of primary design elements of a golf club driver that contribute to performance, including moment of inertia (MOI), coefficient of restitution (COR), and the placement of the driver center of gravity (CG). Although it is not necessarily a primary design objective when compared to MOI or COR, the reduction of aerodynamic drag duri...
Article
Abstract Greater use of 3D conformal, Intensity Modulated Radiotherapy (IMRT) and external beam partial breast irradiation following local excision (LE) for breast cancer has necessitated a review of the effectiveness of immobilisation methods to stabilise breast tissue. To identify the suitability of currently available breast (rather than thorax)...
Article
Full-text available
The aerodynamic mechanisms that produce swing, and reverse swing in cricket are well understood and the phenomenon has often been measured in wind tunnel tests. However, it is widely believed throughout the cricketing community that atmospheric conditions can have a dramatic effect on a bowler's ability to make the ball swing, and this has perplexe...
Conference Paper
Many biomechanical analyses rely on the availability of reliable body segment inertia parameter (BSIP) estimates. Current processes to obtain these estimates involve many time consuming manual measurements of the human body, used in conjunction with models or equations. While such methods have become the accepted standard they contain many inherent...
Article
This paper presents the full derivation of an analytical model for track cycling. The model takes into account the unique aspects of track cycling associated with riding around a velodrome. These include, riding upon a banked track and the resulting tyre scrubbing effects, and the tipping motion of a cyclist passing through a corner with the result...
Article
Full-text available
Computational Fluid Dynamics has been used to perform a detailed aerodynamic analysis of a downhill skateboarder. The modelled geometry is that of a British downhill skateboarder, acquired using non contact laser scanning. Three helmets used by the skater were also compared, which revealed how each helmet directed the flow of air around and onto th...
Article
Full-text available
An explicit finite element (FE) model of a tennis ball impact on a freely suspended racket was produced in Ansys/LS-DYNA 10.0. The geometry for the racket frame was reproduced in the FE model using a non-contact laser scanner. The model was validated against experimental data obtained using the fully automated International Tennis Federation Racket...
Chapter
An X-Ray microtompgraphic and a laser based method have been used for getting surface scan of some cardiovascular devices. Several stent and mechanical heart valve types have been scanned, highlighting the advantages and disadvantages of each method. The major advantage of X-Ray microtomography is the possibility of evaluating the mass distribution...
Chapter
The skeleton bobsled is a relatively new discipline of winter sports that competes in the winter Olympic Games. It is a sport with high speeds where fearless determination of the individual slider is required to achieve a winning margin which can be a 100th of a second. Skeleton bobsled requires the athlete to sprint, board a sled (weighing upto 43...
Article
Full-text available
We succeeded in obtaining PSP (Pressure-Sensitive Paint) measurements for a rugby ball. It was found that the seam of the ball is the trigger for initiating low pressure. Therefore, a slower spinning ball fluctuates during flight because of the asymmetrical pressure distribution on the sides of the ball. Based on the results from PSP measurements,...
Chapter
Water ski jumping is one of the oldest disciplines in water skiing. The first jump was performed by Ralph Samuelson of Minnesota (US) in 1925, three years after he had invented water skiing. Samuelson jumped 18 m off the end of a greased ramp. Today water ski jumping is an international sport with elite male athletes jumping distances in excess of...
Article
This task is concerned with the recovery of pressure in a fluid as it flows through various conical diffusers of the same inlet (d) and outlet (D) diameters, but with different included angles (2q). In particular, it involves comparison of the measured and computational fluid dynamics (CFD) predicted pressure recovery coefficients (PRC) and, for mo...
Chapter
The skeleton bobsled is a relatively new discipline of winter sports that competes in the winter Olympic Games. It is a sport with high speeds where fearless determination of the individual slider is required to achieve a winning margin which can be a 100th of a second. Skeleton bobsled requires the athlete to sprint, board a sled (weighing upto 43...

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