Alejandro Lozano-Guzman | Instituto Politécnico Nacional (original) (raw)
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Papers by Alejandro Lozano-Guzman
International Journal of Heavy Vehicle Systems, 2009
... MI Salem, VH Mucino*, E. Saunders and M. Gautam Mechanical and Aerospace Engineering, College... more ... MI Salem, VH Mucino*, E. Saunders and M. Gautam Mechanical and Aerospace Engineering, College of Engineering and Mineral Resources, Morgantown, WV 26505, USA E-mail: msalem23@yahoo.com E-mail: vhmucino@mail.wvu.edu E-mail: eric.saunders@mail.wvu.edu ...
Mechanical Vibrations and Condition Monitoring, 2020
The basis for most conditioning monitoring systems is the analysis of vibration signals. Thus, a ... more The basis for most conditioning monitoring systems is the analysis of vibration signals. Thus, a fundamental way to understand the causes and effects of vibrations is the study of the oscillatory movements and the interactions among the different components of a machine or a set of machines. These oscillatory movements, in the context of design and machinery analysis, are known as mechanical vibrations, or more generically vibrations. The essence of conditioning monitoring is the analysis of the relationship between the input signal (the source of vibration) and the output response (the output signal), and the evolution of the dynamic behavior of the machine. In most cases, the machinery can be considered a linear system, although there are some particular cases that will be analyzed in other chapters, and the output signal will be a linear response of the excitation forces. Even though a machine is a complex system composed of a large number of mechanical elements, its dynamic resp...
The transportation of liquids involves several situations derived from the curved shape of the ca... more The transportation of liquids involves several situations derived from the curved shape of the cargo containers, including a comparatively high center of gravity, which negatively shifts when the container is partially loaded, and the vehicle is subjected to steering or braking accelerations. Aiming at reducing these effects several experimental approaches have been applied, involving different tank shapes and the use of baffles, tested under laboratory or field conditions, at full scale or at a down-scale. However, the scope of such approaches has been limited, mainly because the potential effect of other components of the vehicle on the road tanker behavior, has been neglected. In this paper, a critical review is presented of the experimental approaches considered so far, identifying specific experimental needs to improve the performance of the vehicles, from both the road safety and the environmental perspective.
Vibroengineering PROCEDIA, 2020
Hydro-pneumatic suspension (HPS) systems could attenuate broad-frequency-range vibration mainly v... more Hydro-pneumatic suspension (HPS) systems could attenuate broad-frequency-range vibration mainly via the nonlinear hydraulic damping property. While the strut design with shared gas-oil chamber leads to gas-oil emulsion within strut chambers which intricately affects the fluid flows between the coupled chambers and thus the damping force. This study investigated the temperature-and frequency-dependent hydraulic damping properties of a compact hydro-pneumatic suspension strut, in terms of the flow discharge coefficients. A laboratory experiment was performed at nearly-constant strut temperature of 30, 40 and 50 °C, in the frequency range of 0.5-8 Hz. The obtained experimental data are used to identify the discharge coefficients of the emulsion flow across bleed orifices and check valves, which determine the damping property of the considered strut. An analytical model is established, and the simulation results obtained under different strut temperature and excitation frequencies showed reasonably good agreements with the experimental data. The results suggested greater discharge coefficient of the bleed orifice than that of the check valve, which might be due to the relatively complex structure of the check valves. Greater excitation frequency was shown to decrease the discharge coefficients in a nonlinear manner, irrespective of the strut temperature. Greater strut temperature, however, leaded to greater discharge coefficient of the check valve. Increasing the excitation frequency from 0.5 Hz to 8 Hz resulted in nearly 14 % decrease in the discharge coefficient of check valve at a constant strut temperature of 50 °C.
Volume 14: Emerging Technologies; Engineering Management, Safety, Ethics, Society, and Education; Materials: Genetics to Structures, 2014
In a context in which a succession of crashes involving double combination vehicles has occurred ... more In a context in which a succession of crashes involving double combination vehicles has occurred in Mexico during 2012 and 2013, a catastrophic accident occurred on May 7, 2013, burning-killing 27 people whose homes were located adjacent to the road. In this case, the double combination carried Liquefied Petroleum Gas (LPG) in both containers, the second of which exploded as a consequence of its decoupling from the vehicle and roll over. The impact of the tractor against the median barrier due to an excessive evasive maneuver sparked a first conflagration due to a fuel leakage, which supplied the heat for the warming and subsequent explosion of the rolled-over container. The cabin of the tractor-semitrailer caught fire but the driver was able to move the vehicle 500 meters away from the crash spot. The analysis suggests that several characteristics of the vehicle and infrastructure could have mitigated or prevented the catastrophic consequences of this event, along with an appropria...
Archivos latinoamericanos de nutrición, 2001
The effect of the addition of vitamins and soy protein on the quality characteristics of nixtamal... more The effect of the addition of vitamins and soy protein on the quality characteristics of nixtamal tortillas (TN) and the losses of nutrients during the nixtamalization process were evaluated. Vitamins (0.15% as is) and defatted soy (4% as is) were added to the tortillas without affecting their sensory characteristics. Higher values of those nutrients had a negative effect on the color and flavor of the product. During the production of the tortilla the corn lost approximately 1.5% of proteins. The nixtamal tortilla fortified with 4% of defatted soy (TNS) showed 3% higher protein content than the TN. The calcium content in the samples was 7.7, 114 and 212.5 mg/100 g for the corn, the TN and the TNS respectively. In the process of producing the nixtamal tortillas from corn 28.9% of the niacin, 46.3% of the folic acid, 36.3% of the thiamin and 80% of the riboflavin were lost. During the washing and rinsing of the nixtamal there were losses of 18.2% of the thiamin, 16.6% of the riboflav...
Revista española de Documentación Científica, 2009
Revista española de Documentación Científica, 2012
Volume 3: Design, Materials and Manufacturing, Parts A, B, and C, 2012
In traditional machine, equipment and devices design, technical solutions are practically indepen... more In traditional machine, equipment and devices design, technical solutions are practically independent, thus increasing designs cost and complexity. Overcoming this situation has been tackled just using designers experience. In this work, a data clustering method which allows this data presentation in a more systematic way using a matrix arrangement, is shown. From this matrix, data can be reorganized in clusters with a hierarchical structure, in such a way that modular design is now more tractable. Proposed method is based on a Euclidean algorithm which allows finding the shortest vectorial distance among technical solutions. Taking product properties as vector dimensions, a recursive method for moving matrix rows and columns is applied. As a result of this procedure, the minimum vector distances are found thus being possible to identify the best technical solutions for the design problem raised. The proposed modular procedure is shown with a 30 inches oven door design.
Lecture Notes in Computer Science, 2014
A methodology for calculating a hexapod robot CG is presented. The CG coordinates related to a gl... more A methodology for calculating a hexapod robot CG is presented. The CG coordinates related to a global reference frame are obtained as a function of the angular position of the joints and the thorax orientation. The equations presented were validated using a CAD software. Using the Normalized Energy Stability Margin (SNE) criterion the robot stability was analyzed simulating the robot CG position on an inclined plane.
Volume 5: Education and Globalization; General Topics, 2012
International Journal of Heavy Vehicle Systems, 2009
... MI Salem, VH Mucino*, E. Saunders and M. Gautam Mechanical and Aerospace Engineering, College... more ... MI Salem, VH Mucino*, E. Saunders and M. Gautam Mechanical and Aerospace Engineering, College of Engineering and Mineral Resources, Morgantown, WV 26505, USA E-mail: msalem23@yahoo.com E-mail: vhmucino@mail.wvu.edu E-mail: eric.saunders@mail.wvu.edu ...
Mechanical Vibrations and Condition Monitoring, 2020
The basis for most conditioning monitoring systems is the analysis of vibration signals. Thus, a ... more The basis for most conditioning monitoring systems is the analysis of vibration signals. Thus, a fundamental way to understand the causes and effects of vibrations is the study of the oscillatory movements and the interactions among the different components of a machine or a set of machines. These oscillatory movements, in the context of design and machinery analysis, are known as mechanical vibrations, or more generically vibrations. The essence of conditioning monitoring is the analysis of the relationship between the input signal (the source of vibration) and the output response (the output signal), and the evolution of the dynamic behavior of the machine. In most cases, the machinery can be considered a linear system, although there are some particular cases that will be analyzed in other chapters, and the output signal will be a linear response of the excitation forces. Even though a machine is a complex system composed of a large number of mechanical elements, its dynamic resp...
The transportation of liquids involves several situations derived from the curved shape of the ca... more The transportation of liquids involves several situations derived from the curved shape of the cargo containers, including a comparatively high center of gravity, which negatively shifts when the container is partially loaded, and the vehicle is subjected to steering or braking accelerations. Aiming at reducing these effects several experimental approaches have been applied, involving different tank shapes and the use of baffles, tested under laboratory or field conditions, at full scale or at a down-scale. However, the scope of such approaches has been limited, mainly because the potential effect of other components of the vehicle on the road tanker behavior, has been neglected. In this paper, a critical review is presented of the experimental approaches considered so far, identifying specific experimental needs to improve the performance of the vehicles, from both the road safety and the environmental perspective.
Vibroengineering PROCEDIA, 2020
Hydro-pneumatic suspension (HPS) systems could attenuate broad-frequency-range vibration mainly v... more Hydro-pneumatic suspension (HPS) systems could attenuate broad-frequency-range vibration mainly via the nonlinear hydraulic damping property. While the strut design with shared gas-oil chamber leads to gas-oil emulsion within strut chambers which intricately affects the fluid flows between the coupled chambers and thus the damping force. This study investigated the temperature-and frequency-dependent hydraulic damping properties of a compact hydro-pneumatic suspension strut, in terms of the flow discharge coefficients. A laboratory experiment was performed at nearly-constant strut temperature of 30, 40 and 50 °C, in the frequency range of 0.5-8 Hz. The obtained experimental data are used to identify the discharge coefficients of the emulsion flow across bleed orifices and check valves, which determine the damping property of the considered strut. An analytical model is established, and the simulation results obtained under different strut temperature and excitation frequencies showed reasonably good agreements with the experimental data. The results suggested greater discharge coefficient of the bleed orifice than that of the check valve, which might be due to the relatively complex structure of the check valves. Greater excitation frequency was shown to decrease the discharge coefficients in a nonlinear manner, irrespective of the strut temperature. Greater strut temperature, however, leaded to greater discharge coefficient of the check valve. Increasing the excitation frequency from 0.5 Hz to 8 Hz resulted in nearly 14 % decrease in the discharge coefficient of check valve at a constant strut temperature of 50 °C.
Volume 14: Emerging Technologies; Engineering Management, Safety, Ethics, Society, and Education; Materials: Genetics to Structures, 2014
In a context in which a succession of crashes involving double combination vehicles has occurred ... more In a context in which a succession of crashes involving double combination vehicles has occurred in Mexico during 2012 and 2013, a catastrophic accident occurred on May 7, 2013, burning-killing 27 people whose homes were located adjacent to the road. In this case, the double combination carried Liquefied Petroleum Gas (LPG) in both containers, the second of which exploded as a consequence of its decoupling from the vehicle and roll over. The impact of the tractor against the median barrier due to an excessive evasive maneuver sparked a first conflagration due to a fuel leakage, which supplied the heat for the warming and subsequent explosion of the rolled-over container. The cabin of the tractor-semitrailer caught fire but the driver was able to move the vehicle 500 meters away from the crash spot. The analysis suggests that several characteristics of the vehicle and infrastructure could have mitigated or prevented the catastrophic consequences of this event, along with an appropria...
Archivos latinoamericanos de nutrición, 2001
The effect of the addition of vitamins and soy protein on the quality characteristics of nixtamal... more The effect of the addition of vitamins and soy protein on the quality characteristics of nixtamal tortillas (TN) and the losses of nutrients during the nixtamalization process were evaluated. Vitamins (0.15% as is) and defatted soy (4% as is) were added to the tortillas without affecting their sensory characteristics. Higher values of those nutrients had a negative effect on the color and flavor of the product. During the production of the tortilla the corn lost approximately 1.5% of proteins. The nixtamal tortilla fortified with 4% of defatted soy (TNS) showed 3% higher protein content than the TN. The calcium content in the samples was 7.7, 114 and 212.5 mg/100 g for the corn, the TN and the TNS respectively. In the process of producing the nixtamal tortillas from corn 28.9% of the niacin, 46.3% of the folic acid, 36.3% of the thiamin and 80% of the riboflavin were lost. During the washing and rinsing of the nixtamal there were losses of 18.2% of the thiamin, 16.6% of the riboflav...
Revista española de Documentación Científica, 2009
Revista española de Documentación Científica, 2012
Volume 3: Design, Materials and Manufacturing, Parts A, B, and C, 2012
In traditional machine, equipment and devices design, technical solutions are practically indepen... more In traditional machine, equipment and devices design, technical solutions are practically independent, thus increasing designs cost and complexity. Overcoming this situation has been tackled just using designers experience. In this work, a data clustering method which allows this data presentation in a more systematic way using a matrix arrangement, is shown. From this matrix, data can be reorganized in clusters with a hierarchical structure, in such a way that modular design is now more tractable. Proposed method is based on a Euclidean algorithm which allows finding the shortest vectorial distance among technical solutions. Taking product properties as vector dimensions, a recursive method for moving matrix rows and columns is applied. As a result of this procedure, the minimum vector distances are found thus being possible to identify the best technical solutions for the design problem raised. The proposed modular procedure is shown with a 30 inches oven door design.
Lecture Notes in Computer Science, 2014
A methodology for calculating a hexapod robot CG is presented. The CG coordinates related to a gl... more A methodology for calculating a hexapod robot CG is presented. The CG coordinates related to a global reference frame are obtained as a function of the angular position of the joints and the thorax orientation. The equations presented were validated using a CAD software. Using the Normalized Energy Stability Margin (SNE) criterion the robot stability was analyzed simulating the robot CG position on an inclined plane.
Volume 5: Education and Globalization; General Topics, 2012