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Papers by Jenner Richards
Advances in Aircraft and Spacecraft Science, Mar 1, 2019
AIAA Scitech 2019 Forum, 2019
La literatura contempla la vivienda como una de las consecuencias de la pobreza en los hogares. E... more La literatura contempla la vivienda como una de las consecuencias de la pobreza en los hogares. En este trabajo se invierte el argumento y se evalúa cómo la tenencia de vivienda puede generar situaciones de pobreza. En él se estiman distintos indicadores de accesibilidad y se obtiene evidencia empírica de la distinta situación de pobreza de los hogares españoles según su tenencia. Utilizando los microdatos de la Encuesta de Calidad de Vida para España, el artículo segmenta la información por tenencia residencial y calcula las líneas de pobrezas asociadas a la propiedad, el alquiler a precios de mercado, el alquiler por debajo de los precios de mercado y la cesión gratuita de la vivienda, cuatro fórmulas de tenencia del parque español. Los resultados sugieren que la elevada tasa de propiedad ha protegido de la pobreza a un gran número de hogares pobres propietarios, especialmente tras la crisis económica en España.
Reference Module in Materials Science and Materials Engineering, 2018
Presently, in alignment with the permanent need to maximize endurance and payload capacity in unm... more Presently, in alignment with the permanent need to maximize endurance and payload capacity in unmanned aircraft, the industry faces the demanding challenge to explore new airframe design and manufacturing technologies to reduce the maximum take-off weight. These requirements have created design challenges and commercial opportunities in manufacturing of lightweight composite airframes. Common applications of unmanned aircraft include surveillance, remote sensing, and search and rescue, to name a few. Additionally, original equipment manufacturers are also exploring the use of unmanned subscale demonstrators for novel aircraft configuration flight worthiness validation and evaluation at reduced cost and risk. This chapter presents the current composites manufacturing technologies used in most of the unmanned aircraft currently in the market. A case study on the composite manufacturing process of an airframe of a novel unmanned joined-wing Sensorcraft is presented.
54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2013
The Boeing Joined Wing SensorCraft is a High Altitude Long Endurance (HALE) Intelligence Surveill... more The Boeing Joined Wing SensorCraft is a High Altitude Long Endurance (HALE) Intelligence Surveillance and Reconnaissance (ISR) platform. Boeing′s approach in utilizing a joined-wing configuration offers potential aerodynamic and structural benefits including unmatched ISR capabilities complementing the overall mission. However, associated with these advantages is the potential for nonlinear aeroelastic response. In an effort to compliment computational studies, the design, construction, and flight testing of a 1/9th scale, aeroelastically tuned model of the Joined-Wing SensorCraft has been the subject of an ongoing international collaboration aimed at experimentally demonstrating the nonlinear aeroelastic response. To accurately measure and capture the configuration′s potential for structural nonlinearity, the test article must exhibit equivalent structural flexibility and be designed to meet airworthiness standards. Previous work has demonstrated airworthiness through the successful flight of a Geometrically Scaled Remotely Piloted Vehicle, but its capability to demonstrate geometric nonlinearities in flight has yet to be determined. Current work involves evaluation of an aeroelstically tuned design through finite element modeling and experimentation. Initial investigation using lower order models point to the possibility of using the existing forward wings, combined with tailored aft wings. The focus of this work is the evaluation suitability of these wings in terms of the structural limits, based on high fidelity modeling and ground test validation.
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference<BR>20th AIAA/ASME/AHS Adaptive Structures Conference<BR>14th AIAA, 2012
The proposed Boeing SensorCraft concept is a High Altitude, Long Endurance Platform intended to p... more The proposed Boeing SensorCraft concept is a High Altitude, Long Endurance Platform intended to provide persistent intelligence, surveillance and reconnaissance capabilities. The concept employs a joined-wing configuration that has potential aerodynamic and structural benefits, as well as the capability to achieve 360 sensor coverage due to confomal sensor arrays distributed throughought the wings. Along with these unique advantages comes several challenges, specifically a predicted non-linear geometric response that may lead to phenomena such as aft wing buckling. In order to further investigate these potential problems it is desired to build and flight test a 1/9 scale, aeroelastically tailored vehicle. The complex nature of building and operating a flexible, aeroelastically scaled aircraft, along with additional challenges such as flightworthiness and control, have necessitated an incremental approach to the flight test program. The work presented in this paper is focused on the instrumentation, ground testing and flight operation of an initial 1/9 scale, geometrically equivelent Joined Wing Sensoraft vehicle. The work also summarizes the results of the initial flight test campaign, some lessons learned and concludes with the recommendation to proceed with the next phase of the project which will include rewinging the aircraft with aeroelastically scaled wings and subsequent flight testing.
Transactions of the Canadian Society for Mechanical Engineering, 2019
The transition to cleaner, more efficient and longer-endurance aircraft is at the forefront of re... more The transition to cleaner, more efficient and longer-endurance aircraft is at the forefront of research and development in air vehicles. The focus of this research is to experimentally evaluate hybrid propulsion and energy harvesting systems in unmanned aerial vehicles (UAVs). Hybrid systems offer benefits over conventional gasoline and electric systems including lower environmental impacts, reduced fuel consumption, redundancy, and distributed propulsion. Additional energy efficiency can be achieved by harvesting some of the thermal energy of the exhaust gases. The development and experimental evaluation of a hybrid propulsion UAV was carried out at the University of Victoria Center for Aerospace Research (UVIC-CfAR) in the framework of the Green Aviation Research & Development Network (GARDN) grant. The work involved the development of a framework to evaluate UAV hybrid propulsion efficiency, and to predict the amount of power harvestable from thermoelectric generators (TEGs). The...
52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2011
th scale, aeroelastically equivalent Remotely Piloted Vehicle (RPV) is desired to investigate the... more th scale, aeroelastically equivalent Remotely Piloted Vehicle (RPV) is desired to investigate the gust response of a Joined-Wing Sensorcraft concept. In order to achieve aeroelastic similarity between the reduced and full scale models, several key scaling parameters must be applied. These parameters are derived from the governing aeroelastic equations of motion and are used to scale the baseline modal response. Several optimization strategies are developed and applied in order to match the 1/9 th scale article’s modal response with that of the scaled baseline. Special consideration is required as this model is to be used for flight testing and therefore an initial, “rigid”, airworthy aircraft is designed for an initial flight test program. The design of this initial model will help determine component space reservations and masses, which is critical for subsequent aeroelastic scaling work. I. Nomenclature []fs = Subscript referring to full scale aircraft []m = Subscript referring to...
A 1/9 th scale, aeroelastically equivalent Remotely Piloted Vehicle (RPV) is desired to investiga... more A 1/9 th scale, aeroelastically equivalent Remotely Piloted Vehicle (RPV) is desired to investigate the gust response of a Joined-Wing Sensorcraft concept. In order to achieve aeroelastic similarity between the reduced and full scale models, several key scaling parameters must be applied. These parameters are derived from the governing aeroelastic equations of motion and are used to scale the baseline modal response. Several optimization strategies are developed and applied in order to match the 1/9 th scale article’s modal response with that of the scaled baseline. Special consideration is required as this model is to be used for flight testing and therefore an initial, “rigid”, airworthy aircraft is designed for an initial flight test program. The design of this initial model will help determine component space reservations and masses, which is critical for subsequent aeroelastic scaling work.
The United States Air Force has specified a need for the next generation, High Altitude, Long End... more The United States Air Force has specified a need for the next generation, High Altitude, Long Endurance aircraft capable of carrying advanced sensor arrays over very large distances and at extreme altitudes. These extensive set of requirements has required a radical shift away from the conventional wing & tube configurations with a new focus placed on extremely light weight and unconventional structural and aerodynamic configurations. One such example is the Boeing Joined wing SensorCraft Concept. The Joined wing concept has potential structural and sensor carrying benefits, but along with these potential benefits come several challenges. One of the primary concerns is the aeroelastic response of the aft wing, with potential adverse behaviours such as flutter and highly nonlinear structural behaviour of the aft wing under gust conditions. While nonlinear computation models have been developed to predict these responses, there exists a lack of experimental ground and flight test data...
Advances in Aircraft and Spacecraft Science, Mar 1, 2019
AIAA Scitech 2019 Forum, 2019
La literatura contempla la vivienda como una de las consecuencias de la pobreza en los hogares. E... more La literatura contempla la vivienda como una de las consecuencias de la pobreza en los hogares. En este trabajo se invierte el argumento y se evalúa cómo la tenencia de vivienda puede generar situaciones de pobreza. En él se estiman distintos indicadores de accesibilidad y se obtiene evidencia empírica de la distinta situación de pobreza de los hogares españoles según su tenencia. Utilizando los microdatos de la Encuesta de Calidad de Vida para España, el artículo segmenta la información por tenencia residencial y calcula las líneas de pobrezas asociadas a la propiedad, el alquiler a precios de mercado, el alquiler por debajo de los precios de mercado y la cesión gratuita de la vivienda, cuatro fórmulas de tenencia del parque español. Los resultados sugieren que la elevada tasa de propiedad ha protegido de la pobreza a un gran número de hogares pobres propietarios, especialmente tras la crisis económica en España.
Reference Module in Materials Science and Materials Engineering, 2018
Presently, in alignment with the permanent need to maximize endurance and payload capacity in unm... more Presently, in alignment with the permanent need to maximize endurance and payload capacity in unmanned aircraft, the industry faces the demanding challenge to explore new airframe design and manufacturing technologies to reduce the maximum take-off weight. These requirements have created design challenges and commercial opportunities in manufacturing of lightweight composite airframes. Common applications of unmanned aircraft include surveillance, remote sensing, and search and rescue, to name a few. Additionally, original equipment manufacturers are also exploring the use of unmanned subscale demonstrators for novel aircraft configuration flight worthiness validation and evaluation at reduced cost and risk. This chapter presents the current composites manufacturing technologies used in most of the unmanned aircraft currently in the market. A case study on the composite manufacturing process of an airframe of a novel unmanned joined-wing Sensorcraft is presented.
54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2013
The Boeing Joined Wing SensorCraft is a High Altitude Long Endurance (HALE) Intelligence Surveill... more The Boeing Joined Wing SensorCraft is a High Altitude Long Endurance (HALE) Intelligence Surveillance and Reconnaissance (ISR) platform. Boeing′s approach in utilizing a joined-wing configuration offers potential aerodynamic and structural benefits including unmatched ISR capabilities complementing the overall mission. However, associated with these advantages is the potential for nonlinear aeroelastic response. In an effort to compliment computational studies, the design, construction, and flight testing of a 1/9th scale, aeroelastically tuned model of the Joined-Wing SensorCraft has been the subject of an ongoing international collaboration aimed at experimentally demonstrating the nonlinear aeroelastic response. To accurately measure and capture the configuration′s potential for structural nonlinearity, the test article must exhibit equivalent structural flexibility and be designed to meet airworthiness standards. Previous work has demonstrated airworthiness through the successful flight of a Geometrically Scaled Remotely Piloted Vehicle, but its capability to demonstrate geometric nonlinearities in flight has yet to be determined. Current work involves evaluation of an aeroelstically tuned design through finite element modeling and experimentation. Initial investigation using lower order models point to the possibility of using the existing forward wings, combined with tailored aft wings. The focus of this work is the evaluation suitability of these wings in terms of the structural limits, based on high fidelity modeling and ground test validation.
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference<BR>20th AIAA/ASME/AHS Adaptive Structures Conference<BR>14th AIAA, 2012
The proposed Boeing SensorCraft concept is a High Altitude, Long Endurance Platform intended to p... more The proposed Boeing SensorCraft concept is a High Altitude, Long Endurance Platform intended to provide persistent intelligence, surveillance and reconnaissance capabilities. The concept employs a joined-wing configuration that has potential aerodynamic and structural benefits, as well as the capability to achieve 360 sensor coverage due to confomal sensor arrays distributed throughought the wings. Along with these unique advantages comes several challenges, specifically a predicted non-linear geometric response that may lead to phenomena such as aft wing buckling. In order to further investigate these potential problems it is desired to build and flight test a 1/9 scale, aeroelastically tailored vehicle. The complex nature of building and operating a flexible, aeroelastically scaled aircraft, along with additional challenges such as flightworthiness and control, have necessitated an incremental approach to the flight test program. The work presented in this paper is focused on the instrumentation, ground testing and flight operation of an initial 1/9 scale, geometrically equivelent Joined Wing Sensoraft vehicle. The work also summarizes the results of the initial flight test campaign, some lessons learned and concludes with the recommendation to proceed with the next phase of the project which will include rewinging the aircraft with aeroelastically scaled wings and subsequent flight testing.
Transactions of the Canadian Society for Mechanical Engineering, 2019
The transition to cleaner, more efficient and longer-endurance aircraft is at the forefront of re... more The transition to cleaner, more efficient and longer-endurance aircraft is at the forefront of research and development in air vehicles. The focus of this research is to experimentally evaluate hybrid propulsion and energy harvesting systems in unmanned aerial vehicles (UAVs). Hybrid systems offer benefits over conventional gasoline and electric systems including lower environmental impacts, reduced fuel consumption, redundancy, and distributed propulsion. Additional energy efficiency can be achieved by harvesting some of the thermal energy of the exhaust gases. The development and experimental evaluation of a hybrid propulsion UAV was carried out at the University of Victoria Center for Aerospace Research (UVIC-CfAR) in the framework of the Green Aviation Research & Development Network (GARDN) grant. The work involved the development of a framework to evaluate UAV hybrid propulsion efficiency, and to predict the amount of power harvestable from thermoelectric generators (TEGs). The...
52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2011
th scale, aeroelastically equivalent Remotely Piloted Vehicle (RPV) is desired to investigate the... more th scale, aeroelastically equivalent Remotely Piloted Vehicle (RPV) is desired to investigate the gust response of a Joined-Wing Sensorcraft concept. In order to achieve aeroelastic similarity between the reduced and full scale models, several key scaling parameters must be applied. These parameters are derived from the governing aeroelastic equations of motion and are used to scale the baseline modal response. Several optimization strategies are developed and applied in order to match the 1/9 th scale article’s modal response with that of the scaled baseline. Special consideration is required as this model is to be used for flight testing and therefore an initial, “rigid”, airworthy aircraft is designed for an initial flight test program. The design of this initial model will help determine component space reservations and masses, which is critical for subsequent aeroelastic scaling work. I. Nomenclature []fs = Subscript referring to full scale aircraft []m = Subscript referring to...
A 1/9 th scale, aeroelastically equivalent Remotely Piloted Vehicle (RPV) is desired to investiga... more A 1/9 th scale, aeroelastically equivalent Remotely Piloted Vehicle (RPV) is desired to investigate the gust response of a Joined-Wing Sensorcraft concept. In order to achieve aeroelastic similarity between the reduced and full scale models, several key scaling parameters must be applied. These parameters are derived from the governing aeroelastic equations of motion and are used to scale the baseline modal response. Several optimization strategies are developed and applied in order to match the 1/9 th scale article’s modal response with that of the scaled baseline. Special consideration is required as this model is to be used for flight testing and therefore an initial, “rigid”, airworthy aircraft is designed for an initial flight test program. The design of this initial model will help determine component space reservations and masses, which is critical for subsequent aeroelastic scaling work.
The United States Air Force has specified a need for the next generation, High Altitude, Long End... more The United States Air Force has specified a need for the next generation, High Altitude, Long Endurance aircraft capable of carrying advanced sensor arrays over very large distances and at extreme altitudes. These extensive set of requirements has required a radical shift away from the conventional wing & tube configurations with a new focus placed on extremely light weight and unconventional structural and aerodynamic configurations. One such example is the Boeing Joined wing SensorCraft Concept. The Joined wing concept has potential structural and sensor carrying benefits, but along with these potential benefits come several challenges. One of the primary concerns is the aeroelastic response of the aft wing, with potential adverse behaviours such as flutter and highly nonlinear structural behaviour of the aft wing under gust conditions. While nonlinear computation models have been developed to predict these responses, there exists a lack of experimental ground and flight test data...