A state-of-the-art review of curve squeal noise: Phenomena, mechanisms, modelling and mitigation

[EN] Curve squeal is an intense tonal noise occurring when a rail vehicle negotiates a sharp curve. The phenomenon can be considered to be chaotic, with a widely differing likelihood of occurrence on different days or even times of day. The term curve squeal may include several different phenomena with a wide range of dominant frequencies and potentially different excitation mechanisms. This review addresses the different squeal phenomena and the approaches used to model squeal noise; both time-domain and frequency-domain approaches are discussed and compared. Supporting measurements using test rigs and field tests are also summarised. A particular aspect that is addressed is the excitation mechanism. Two mechanisms have mainly been considered in previous publications. In many early papers the squeal was supposed to be generated by the so-called falling friction characteristic in which the friction coefficient reduces with increasing sliding velocity. More recently the mode coupling mechanism has been raised as an alternative. These two mechanisms are explained and compared and the evidence for each is discussed. Finally, a short review is given of mitigation measures and some suggestions are offered for why these are not always successful.Squicciarini, G.; Thompson, D.; Ding, B.; Baeza González, LM. (2018). A state-of-the-art review of curve squeal noise: Phenomena, mechanisms, modelling and mitigation. Notes on Numerical Fluid Mechanics and Multidisciplinary Design. 139:3-41. https://doi.org/10.1007/978-3-319-73411-8_1S341139Anderson, D., Wheatley, N., Fogarty, B., Jiang, J., Howie, A., Potter, W.: Mitigation of curve squeal noise in Queensland, New South Wales and South Australia. In: Conference on Railway Engineering. pp. 625–636, Perth, Australia (2008)Hanson, D., Jiang, J., Dowdell, B., Dwight, R.: Curve squeal: causes, treatments and results. 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Developing students’ aptitudes through University-Industry collaboration

In addition to the engineering knowledge base that has been traditionally taught, today’s undergraduate engineering students need to be given the opportunity to practice a set of skills that will be demanded to them by future employers, namely: creativity, teamwork, problem solving, leadership and the ability to generate innovative ideas. In order to achieve this and educate engineers with both in-depth technical knowledge and professional skills, universities must carry out their own innovating and find suitable approaches that serve their students. This article presents a novel approach that involves university-industry collaboration. It is based on creating a student community for a particular company, allowing students to deal with real industry projects and apply what they are learning in the classroom. A sample project for the German sports brand adidas is presented, along with the project results and evaluation by students and teachers. The university-industry collaborative approach is shown to be beneficial for both students and industry

Developing students’ aptitudes through University-Industry collaboration

In addition to the engineering knowledge base that has been traditionally taught, today’s undergraduate engineering students need to be given the opportunity to practice a set of skills that will be demanded to them by future employers, namely: creativity, teamwork, problem solving, leadership and the ability to generate innovative ideas. In order to achieve this and educate engineers with both in-depth technical knowledge and professional skills, universities must carry out their own innovating and find suitable approaches that serve their students. This article presents a novel approach that involves university-industry collaboration. It is based on creating a student community for a particular company, allowing students to deal with real industry projects and apply what they are learning in the classroom. A sample project for the German sports brand adidas is presented, along with the project results and evaluation by students and teachers. The university-industry collaborative approach is shown to be beneficial for both students and industry.Además de los conocimientos tradicionales sobre ingeniería, durante sus estudios los estudiantes universitarios requieren poder desarrollar una serie de habilidades críticas para su futuro profesional, tales como creatividad, trabajo en equipo, resolución de problemas, liderazgo e innovación. Por esto, es necesario que las universidades generen nuevas innovaciones en las metodologías de enseñanza. Este artículo presenta un avance en este ámbito, considerando una colaboración universidad-empresa. Esta innovación está basada en la creación de un grupo de trabajo de estudiantes para una empresa, con el objetivo de que los estudiantes pongan en práctica los conocimientos y las habilidades adquiridas en clase en proyectos industriales reales. A modo de ejemplo se presentan los resultados de un proyecto piloto para la empresa alemana adidas, además de la evaluación diagnóstica hecha por los estudiantes y los profesores participantes. De estos resultados se puede deducir que la colaboración entre universidad e industria es beneficiosa para los estudiantes y para la empresa

The influence of a non-linear lecturing approach on student attention: Implementation and assessment

Este artículo presenta el cambio realizado al enfoque de enseñanza de una asignatura específica. El nuevo enfoque está basado en una estructura no-lineal donde cada lección combina conceptos de diferentes temas, al contrario de la estructura lineal tradicional donde cada tema se trata de forma separada. El objetivo del enfoque no-lineal es incrementar el dinamismo y la motivación del estudiante y fomentar el diálogo profesor-estudiante. Se presentan las evaluaciones recogidas de los estudiantes que fueron enseñados mediante los dos enfoques: lineal y no-lineal. Los resultados muestran que el enfoque de enseñanza no-lineal fue bienvenido y dio lugar a un mayor nivel de dinamismo y motivación entre los estudiantes y a un mayor diálogo profesor-estudiante.This paper presents a change made to the lecturing approach used within a specific course. The new lecturing approach is based on a non-linear structure where each lesson combines concepts from different topics, in contrast to the traditional linear structure in which each topic is treated separately. The objective of the non-linear approach is to increase student dynamism and motivation and to foster teacher-student dialog. Assessments from students who were taught according to the traditional linear structure along with assessments from students who were taught under both the linear and non-linear approaches are presented. Results show that the non-linear lecturing approach was welcomed and led to a higher degree of student dynamism and motivation and to more tea-cher-student dialog

Developing students’ aptitudes through University-Industry collaboration

In addition to the engineering knowledge base that has been traditionally taught, today’s undergraduate engineering students need to be given the opportunity to practice a set of skills that will be demanded to them by future employers, namely: creativity, teamwork, problem solving, leadership and the ability to generate innovative ideas. In order to achieve this and educate engineers with both in-depth technical knowledge and professional skills, universities must carry out their own innovating and find suitable approaches that serve their students. This article presents a novel approach that involves university-industry collaboration. It is based on creating a student community for a particular company, allowing students to deal with real industry projects and apply what they are learning in the classroom. A sample project for the German sports brand adidas is presented, along with the project results and evaluation by students and teachers. The university-industry collaborative approach is shown to be beneficial for both students and industry.Además de los conocimientos tradicionales sobre ingeniería, durante sus estudios los estudiantes universitarios requieren poder desarrollar una serie de habilidades críticas para su futuro profesional, tales como creatividad, trabajo en equipo, resolución de problemas, liderazgo e innovación. Por esto, es necesario que las universidades generen nuevas innovaciones en las metodologías de enseñanza. Este artículo presenta un avance en este ámbito, considerando una colaboración universidad-empresa. Esta innovación está basada en la creación de un grupo de trabajo de estudiantes para una empresa, con el objetivo de que los estudiantes pongan en práctica los conocimientos y las habilidades adquiridas en clase en proyectos industriales reales. A modo de ejemplo se presentan los resultados de un proyecto piloto para la empresa alemana adidas, además de la evaluación diagnóstica hecha por los estudiantes y los profesores participantes. De estos resultados se puede deducir que la colaboración entre universidad e industria es beneficiosa para los estudiantes y para la empresa

The influence of a non-linear lecturing approach on student attention: Implementation and assessment

This paper presents a change made to the lecturing approach used within a specific course. The new lecturing approach is based on a non-linear structure where each lesson combines concepts from different topics, in contrast to the traditional linear structure in which each topic is treated separately. The objective of the non-linear approach is to increase student dynamism and motivation and to foster teacher-student dialog. Assessments from students who were taught according to the traditional linear structure along with assessments from students who were taught under both the linear and non-linear approaches are presented. Results show that the non-linear lecturing approach was welcomed and led to a higher degree of student dynamism and motivation and to more tea-cher-student dialog.Este artículo presenta el cambio realizado al enfoque de enseñanza de una asignatura específica. El nuevo enfoque está basado en una estructura no-lineal donde cada lección combina conceptos de diferentes temas, al contrario de la estructura lineal tradicional donde cada tema se trata de forma separada. El objetivo del enfoque no-lineal es incrementar el dinamismo y la motivación del estudiante y fomentar el diálogo profesor-estudiante. Se presentan las evaluaciones recogidas de los estudiantes que fueron enseñados mediante los dos enfoques: lineal y no-lineal. Los resultados muestran que el enfoque de enseñanza no-lineal fue bienvenido y dio lugar a un mayor nivel de dinamismo y motivación entre los estudiantes y a un mayor diálogo profesor-estudiante

Constrained Layer Damper Modelling and Performance Evaluation for Eliminating Squeal Noise in Trams

This paper presents the modelling and design of a constrained layer damper to eliminate squeal noise in a particular tram. Even though resilient wheels are installed in every bogie, squeal noise is generated at the frequency of 780–800 Hz due to the small radius curves that the tram has to draw. Tuned constrained layer dampers provide a solution to this particular problem. Butyl rubber is chosen as the viscoelastic material for the damper, and conventional steel is used for the metallic sheets. The modelling approach and the final design of the damper are presented, together with evaluation of its performance in a real application. Experimental measurements on track have demonstrated that the constrained layer damper is properly tuned to the squealing frequency and that there is a significant reduction in noise when the proposed damper is attached to the wheels

Influence of Sandwich-Type Constrained Layer Damper Design Parameters on Damping Strength

This paper presents a theoretical study of the parameters that influence sandwich-type constrained layer damper design. Although there are different ways to reduce the noise generated by a railway wheel, most devices are based on the mechanism of increasing wheel damping. Sandwich-type constrained layer dampers can be designed so their resonance frequencies coincide with the wheel’s resonant vibration frequencies, and thus the damping effect can be concentrated within the frequency ranges of interest. However, the influence of design parameters has not yet been studied. Based on a number of numerical simulations, this paper provides recommendations for the design stages of sandwich-type constrained layer dampers