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The Evolving Scholar
Delft, Netherlands
1.86k Members

ISSN: 2667-2812

Open access community-driven journal for multidisciplinary and open peer-reviewed publications. Curated by TU Delft OPEN Publishing, the open access publisher of the Delft University of Technology (TU Delft).

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12/02/2024| By
Flavio Flavio Farroni,
+ 5
Dario Dario Milone

Optimizing the performance of racing motorcycles is a central goal for competition teams. The necessity to ensure driver stability and a good level of grip in the widest possible range of riding conditions makes it necessary for tires to work in the right temperature window, capable of ensuring the highest interaction force between tire and road. Specifically, the internal temperature of the tire is a parameter that can be difficult to measure and control but has a significant impact on motorcycle performance and, also, on driver stability. Deepening knowledge of internal tire temperature in racing motorcycles can improve performance optimization on the track and finding the right motorcycle setup. In this work, a physical thermal model is adopted for an activity concerning the development of a moto-student vehicle, to predict the racing motorcycle setup allowing the tire to work in a thermal window that optimizes grip and maximizes tire life. More in detail, a focus has been placed on the effects of the motorcycle’s wheelbase and pivot height variations on internal tire temperatures. Indeed, the stability and handling of the vehicle are highly dependent on the geometric properties of the chassis. Several values of such quantities have been tested in a properly implemented vehicle model developed in the “VI-BikeRealTime” environment, validated by outdoor tests, able to provide forces acting on the tires, slip indices, and speeds, needed by the thermal model as inputs. Through the analysis of the internal temperatures calculated by the model, reached by the various layers of the tire, it has been possible to investigate which of the simulated conditions cause a too-fast thermal activation of the tire and which of them can avoid overheating and underheating phenomena. Lately, this research has delved into the correlation between motorcycle riders' paths and temperature fluctuations with the aim of comprehending how minor alterations in routine maneuvers may influence tire energy activation, particularly in the context of racing and qualifying conditions.

29/11/2023| By
Jasmine Jasmine Bacani ,
Rodrigo Rodrigo Ordonhas Viseu Cardoso

International and prestigious universities located in small cities are growing at a rate beyond the spatial capacity of their host city. Due to this, the presence of students and student housing in these cities has exponentially grown and resulted in a myriad of social, cultural, economic, and spatial impacts. This is known as ‘studentification’ which affects the co-existence and tolerance between the university community and the local community, particularly between students and local residents who lead entirely different and clashing lifestyles. Existing research on campus-city relationships has primarily focused on the economic benefits of large universities in small cities, whereas research on student housing in the Netherlands has primarily focused on the shortage for both incoming and existing students. However, much less attention has been given to the current conditions of student housing qualitatively and what student housing typologies mean for other residents in Delft that may have the potential to shift perspectives from student growth to limitation. As tensions are at an all-time high and further expansion growths have been announced by TU Delft, a need to understand the fundamental conditions that contribute to the negative consequences of studentification is needed more than ever to thoroughly understand the studentification process and recommend a long-term strategic plan towards co-existence. This policy brief highlights the effects of student housing in Delft and creates a strategic plan that is informed by practices of other European cities (Lund, Gottingen, and Loughborough) that is viewed through the political, spatial, and sociocultural lens of Delft to provide an evidence-based and comprehensive approach that transcends conventional practices. By proposing a pathway of policies, regulations, and strategies, a step-by-step process of mitigating the different conflicts and issues resulting from studenification may be mitigated.

02/11/2023| By
+ 2
Juliana E. Juliana E. Gonçalves

Over the last decade, solar energy has proven to be a key technology in transitioning to a sustainable energy system. However, current solar energy policies favour affluent households, limiting the participation of disadvantaged households in the energy transition. This leaves disadvantaged households even more vulnerable to increasing energy costs, as the recent unprecedented rise in energy prices has painfully demonstrated. To ensure that transition mechanisms are accessible to all households, solar energy policy needs to consider spatial justice. With this perspective, we go beyond technical analyses of solar energy potential and use a socio-spatial approach to evaluate the adoption of solar energy in The Hague. This policy brief is based on a research study that evaluated the transition to solar energy in the city of The Hague, The Netherlands, from a spatial justice perspective. Through a socio-spatial analysis at the postcode level, the research identified four distinct groups with varying levels of access to solar energy. The results show that these groups are not only strongly segregated across the city but also overlap with existing socio-spatial inequalities. The four levels of access to solar energy are then compared to current solar adoption rates and technical rooftop energy potential in the city. Results show that decreasing levels of access to solar energy align with decreasing adoption rates, revealing that current policies fail to provide equitable access to solar energy, leading to inequalities in adoption rates. Furthermore, the study quantifies how much of the technical potential available in The Hague is in areas where access to solar energy is limited, revealing a significant amount of untapped technical potential with the potential to address existing socio-spatial inequalities. Finally, two groups of interest and related leverage points for future policy interventions to address equity in the transition to solar energy in The Hague were identified.

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A socio-spatial approach to the energy poverty crisis
31/10/2023| By
+ 2
Juliana E. Juliana E. Gonçalves

Energy poverty is a pressing issue in the Netherlands, with the number of households struggling to cover their energy bills doubling to nearly one million in recent years. Current policies and subsidies have failed to address the needs of underprivileged social groups, leaving them vulnerable and unable to access support for dwelling renovations. This policy brief emphasises the importance of adopting a socio-spatial approach to tackle energy poverty and incorporate justice into renovation policies. By understanding the underlying factors that contribute to vulnerability and pinpointing their spatial distribution, targeted policies can be developed to meet the unique needs of vulnerable groups. The brief highlights the systemic challenges in Amsterdam Zuidoost, where low incomes, lack of trust, and financial constraints hinder renovation efforts. It stresses the urgency of adopting a spatial perspective, recognising the socio-spatial dimensions of vulnerability, and engaging local communities. Through inclusive and participatory processes, the brief aims to promote social equity, spatial justice, and sustainable solutions to combat energy poverty in Amsterdam Zuidoost.

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A Socio-Ecological Approach to Multi-Dimensional Inequality
24/10/2023| By
Larissa Larissa Müller

São Paulo, a city characterised by rapid urbanisation, long-term governmental neglect, and a widening societal gap, faces a complex challenge. Communities within the city experience extreme multidimensional inequality, marked by socio-economic vulnerabilities which stem from their marginalisation from society. In addition, the degradation of critical ecological systems and mounting climate change pressures intensify the risks of environmental disasters, creating a situation of extreme double exposure. This means that vulnerable communities in São Paulo contend with not only socio-economic vulnerabilities but also face heightened environmental risks. While Brazil’s policies took significant steps in the 1980s with the creation of the Estatuto da Cidade (City Statute in 2001) to address social inequality, current solutions are still unable to adequately reduce the multitude of vulnerabilities that marginalised communities face. In order to ensure a high standard of liveability and foster an environment of resilience for São Paulo communities, a comprehensive analysis that exposes the factors that contribute to the creation of multi-dimensional inequality is required. Firstly, recognising that inequality is not just a matter of income but is intricately linked to spatial and environmental dimensions. This policy brief calls for a holistic approach that recognises the interconnectedness of socio-economic vulnerability and environmental risks. By adopting the principles of a socio-ecological approach and conducting a comprehensive socio-spatial analysis, São Paulo can chart a path towards a more equitable and sustainable future for all its residents.

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Assessment of bicycle experimental objective handling quality indicators
03/10/2023| By
Jules Jules Ronné,
+ 1
Thomas Thomas Robert

Understanding and mastering handling quality is a critical concern for bicycle designers, as it directly impacts safety, comfort, and performance. However, this aspect has received limited attention to date. Existing literature offers experimental handling quality indicators based on bicycle kinematics, but their validity has yet to be established. This study aims to assess the predictive power of these indicators using experimental data derived from subjective assessments of handling quality. These data, obtained from a protocol involving 20 participants and 2 bicycles, enabled testing 39 experimental indicators. The results indicate that certain vehicle kinematic quantities are indeed correlated with the perception of handling quality but with low predictive power. Indicators based on handlebar movement are the most effective in explaining the sensation of handling quality. These indicators perform particularly well at low speeds, where physical and cognitive workload are associated with the quantity of control actions on the handlebars.

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BIG SHIFTS in Spatial Planning in The Netherlands
29/09/2023| By
Caroline Caroline Newton,
+ 11
Verena Verena Balz

Based on the understanding of the built environment as result of competing claims on space that must be resolved via recognition, fair distribution of burdens and benefits of our human association, respect and care for the planet and just procedures to decide on those claims, Spatial Planning and Strategy is a chair in the Department of Urbanism within the Faculty of Architecture and the Built Environment of the Delft University of Technology, committed to helping create sustainability, resilience and spatial justice through the implementation of the New Urban Agenda, the Paris Climate Agreement and the European New Deal, among other frameworks. This commitment is reflected in activities, events, and courses. We are concerned with knowledge about the formulation, implementation, and evaluation of strategic and urban planning tools – visions, strategies, plans and programmes.

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Investigation of the Applicability of a Motorcyclist Model for Trajectory Prediction in Real Traffic
26/09/2023| By
Florian Florian Scherer,
Maximilian Maximilian Eschinger

To develop advanced motorcycle assistance systems, the focus is shifting towards the rider's abilities. A model in (Scherer et al. 2022) predicts motorcycle dynamics influenced by riders without specific rider or vehicle parameters. It employs mathematical functions to describe speed and roll angle changes, revealing differences among riders. Unlike previous stochastic approaches, this model allows clear interpretation of measurement data with rider-specific parameters like correction amplitudes and trends, aiding critical maneuver identification. The paper investigates applying this rider model to real traffic data. For this purpose, three riders (two experienced frequent riders and one inexperienced infrequent rider) on two different vehicles (Honda CBF 1000 and BMW K1200R Sport) were recorded and examined on a sample basis using a validated low-cost measurement technique with a total amount of n = 40 measurements. Taking into account evaluation curves suitable for proving the methodology, two consecutive country road curves were selected with a respective change in direction (equivalent to a yaw angle change of the vehicle between entering and exiting the curve) of approx. 180°. These were each driven through 5 times by all three riders under constant conditions in good, summer weather and road conditions. In addition, one of the riders drove through them in wintry and less than optimal road conditions at the beginning of the season. Initial findings assess the model's transferability to real traffic. The investigation results show its applicability, with rider-specific riding styles and parameterization functions, as well as the need to repeat the study with a large number of samples. The model accurately predicts future positions, with over 85% of maneuvers having less than a 2% lateral deviation. This demonstrates applicability under real conditions, confirming its efficacy beyond the closed terrain test in (Scherer et. al., 2022). In the future, this model will enable rider-dependent trajectory predictions with uncertainty intervals in real traffic situations.

26/09/2023| By
Andrew Andrew Dressel,
Jason Jason Moore

We previously presented a narrow-track tilting tricycle with a variable stability mechanism integrated between the swing arms that support a pair of rear wheels, in the so-called “delta” configuration, and with recumbent seating. We now examine adopting that variable stability mechanism to work on a tricycle with a split-parallelogram linkage between a pair of front wheels, in the so-called “tadpole” configuration, and with upright seating. It was fairly straightforward to allow for tilting by replacing the front wheel and fork with a split parallelogram comprising two paired A-arms and kingpins, controlling the motion of the two halves with a bell crank and two tie rods, and then varying the handling of the vehicle by moving the connection point of the tie rods on the bell crank, just as we did with the swing arms of the previous vehicle. We have also separated the two tasks of positioning the tie rod ends on the bell crank and enforcing symmetry of the tie rods. The former does not require much force and can be easily implemented with Bowden cables, but the latter does require large forces and is better implemented with a local rigid-bar linkage. Implementing decent Ackermann steering geometry, allowing for both large tilt and steer angles, and decoupling tilting from steering, however, proved to be quite a challenge, at least while we attempted to implement it with bar linkages. Fortunately, we discovered a 2006 paper by Prof Drstvenšek et al. describing a Bowden cable and cam system that looked promising. Finally, the resulting vehicle handles very nicely. When in “full bicycle” mode, it handles quite similar to the original bicycle that we had converted into the tricycle. When in “rigid tricycle” mode, it keeps the rider upright when stationary or when riding at a walking pace. In between these two extremes, it handles even better than the original bicycle in a slalom course and when slowly following a straight line.

22/09/2023| By
Flavio Flavio Farroni,
+ 3

Bicycle mobility has become increasingly popular as a sustainable and healthy means of transportation. Bicycles are not only a cost-effective transportation mode but also help reduce traffic congestion and air pollution. However, the efficiency and safety of bicycling largely depend on the optimization of bicycle components, such as the tires. The importance of bike tire optimization cannot be underestimated as it can affect both bicycle dynamics and bicycle performance. Due to the lack of multi-physical mathematical models able to analyze and reproduce complex tire/road contact phenomena, useful to predict the wide range of working conditions, this research aims to the development of a bicycle tire thermal model. The main outcome is to provide the full temperature local distribution inside the tire’s inner rubber layers and the inflation chamber. Such kind of information plays a fundamental role in the definition of the optimal adherence conditions, for both safety and performance maximization, and as an indicator of the proper tire design for various applications, each requiring specific heat generation and management. The experimental validation has been carried out thanks to an innovative test-rig developed at Politecnico di Milano. It is known as VetyT (acronym of Velo Tyre Testing), and it complies with the standard ISO 9001-2015. It has been specifically instrumented for the activity, acquiring the external tire temperatures to be compared with the respective simulated ones, under various workingconditions.

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Nicoleta Nastase Delft University of Technology
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Frederique Belliard Delft University of Technology
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Bernard Meulenbroek Delft University of Technology
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Goda Sporn De Gruyter
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Lei Qu Delft University of Technology
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Roberto Rocco Delft University of Technology
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Joke Dales Delft University of Technology
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Monique Ijzinga Delft University of Technology
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