Thematische Bibliographien / Longitudinal position of center of mass

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Auswahl der wissenschaftlichen Literatur zum Thema „Longitudinal position of center of mass“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 3. Februar 2022

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Zeitschriftenartikel zum Thema "Longitudinal position of center of mass"

Mbou, E. Tiaya, E. Njeugna, A. Kemajou, N. R. Tagne Sikame, and D. Ndapeu. "Modelling of the Water Absorption Kinetics and Determination of the Water Diffusion Coefficient in the Pith ofRaffia viniferaof Bandjoun, Cameroon." Advances in Materials Science and Engineering 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/1953087.

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The present work focuses on the study of the water absorption phenomenon through the pith ofRaffia viniferaalong the stem. The water absorption kinetics was studied experimentally by the gravimetric method with the discontinuous control of the sampling mass at temperature of 30°C. The samples of 70 mm × 8 mm × 4 mm were taken from twelve sampling zones of the stem ofRaffia vinifera. The result shows that the percentage of water absorption of the pith ofRaffia viniferaincreases from the periphery to the center in the radial position and from the base to the leaves in the longitudinal position. Fick’s second law was adopted for the study of the water diffusion. Eleven models were tested for the modelling of the water absorption kinetics and the model of Sikame Tagne (2014) is the optimal model. The diffusion coefficients of two stages were determined by the solution of the Fick equation in the twelve sampling zones described by Sikame Tagne et al. (2014). The diffusion coefficients decreased from the center to the periphery in the radial position and from the base to the leaves in the longitudinal position.

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Zhang, Xue Yan, and Wen Ming Zhang. "Vibration Simulation of Articulated Dump Truck with the Variation of Longitudinal Center of Gravity Position of Rear Sprung Mass and Rear Suspension Stiffness." Advanced Materials Research 383-390 (November 2011): 1812–18. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1812.

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The paper is concerned with the vibration for the articulated dump truck (ADT) which is multi-axle vehicle and different from rigid dump truck. The balanced suspension was employed as the rear suspension in the 60t ADT which the paper takes as the research object. A vibration model of 6 dof for the truck was proposed. The impact of the variation of longitudinal center of gravity position of rear sprung mass and rear suspension stiffness on vibration was investigated in stochastic excitation of the truck in the frequency domain. It is found that it is beneficial to the comfort of the truck when the center of gravity of the sprung mass moves forward and the impact of rear sprung stiffness on vibration is not too great. The results of the vibration for the truck are provided for the design of the 60t ADT.

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Skrucany, Tomas, Jan Vrabel, and Patrik Kazimir. "The influence of the cargo weight and its position on the braking characteristics of light commercial vehicles." Open Engineering 10, no. 1 (2020): 154–65. http://dx.doi.org/10.1515/eng-2020-0024.

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AbstractThe influence of the cargo weight loaded on the vehicle and the total gross mass of the vehicle on the braking characteristics is often researched from the road safety reason. However, there is not enough knowledge about the influence of weight and load distribution on the loading area of small trucks or vans on their braking characteristics. This article presents the results of measurements of braking decelerations of the van of N1 category and the braking characteristics of a vehicle loaded with different cargo mass with different cargo locations on the loading area. The impact of the longitudinal cargo position on the loading area on the load of the individual axles and thus on the braking deceleration of the vehicle was investigated. The influence of the height of the center of gravity on the dynamic axle load during braking was also determined. Method of direct vehicle deceleration measurement was used by a decelerometer. There were calculated cargo weight and cargo position influences on the dynamic axle load during braking according to the vehicle deceleration.

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Muis, Jasper. "The Rise and Demise of the Dutch Extreme Right: Discursive Opportunities and Support for the Center Democrats in the 1990s." Mobilization: An International Quarterly 20, no. 1 (2015): 41–60. http://dx.doi.org/10.17813/maiq.20.1.f211773qm103w030.

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This article seeks to explain why the Dutch extreme-right party, Center Democrats (CD), never succeeded in breaking out of its marginal position. It argues that, in addition to analyzing fluctuations in electoral support, scholars should also examine the degree to which extreme-right parties are able to express their views in the mass media. Supply-side explanations are extended by showing that discursive political opportunities need to be openly acknowledged and debated publicly to become relevant. Relying on longitudinal data derived from political claims analysis and opinion polls, this article demonstrates that negative public reactions significantly eroded the electoral attractiveness of the extreme-right party. In contrast, when one's goal is to achieve mass media access, the results reveal that any publicity is favorable publicity. Public criticism enhanced the CD's access to the public debate. Also, rising support in opinion polls led to more public claim making. Remarkably, however, the extreme right party did not increase its electoral support when it made itself more prominently heard in the mass media. Thus, the CD appeared trapped in a spiral of discursive weakness.

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Remiorz, Eryk. "Determination of Critical Rock Mass in a Bucket of a Dinting Loader." Archives of Mining Sciences 62, no. 3 (2017): 531–43. http://dx.doi.org/10.1515/amsc-2017-0039.

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AbstractThe extraction of hard coal deposits lying in increasing depth causes significant problems with maintenance of roadways (maingates, tailgates, etc.). The reduction of the cross section of such excavations, caused by the floor upheaval, leads to the occurrence of many problems with transport and ventilation. Dinting loaders are employed to restore the original size of roadways tightened due to the activity of adverse stresses occurring in the rock mass. These are tracked machines, usually with small width of about 1 m. They often work in roadways with high longitudinal and lateral inclination, as a result of which they are especially susceptible to overturning.The article presents a mathematical model allowing to determine the critical mass of broken rock in a bucket. The model also allows to determine spatial coordinates of a dinting loader’s centre of gravity depending on temporary position of movable elements of the loader such as a turntable, boom, coupler and bucket, and depending on the level of loading the bucket with broken rock. It also enables to determine critical angles of the roadways’ longitudinal and lateral inclination. The outcomes of computer studies of variations in the position of the loader’s centre of gravity depending on deflection angles of moving elements of the loader and the mass of broken rock in the bucket are also presented. Variability ranges of spatial coordinates of the centre of gravity of the loader are also established and examples are given for values of the critical mass of broken rock in the bucket.

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Al-Solihat, Mohammed Khair, Meyer Nahon, and Kamran Behdinan. "Three-dimensional nonlinear coupled dynamic modeling of a tip-loaded rotating cantilever." Journal of Vibration and Control 24, no. 22 (2018): 5366–78. http://dx.doi.org/10.1177/1077546317753058.

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This paper presents a general three-dimensional flexible dynamic model of a tip-loaded rotating cantilever beam. For generality, the beam tip is assumed to be loaded with a rigid body with an arbitrary center of mass position, and subject to external force and moment. The coupled longitudinal (axial), bending–bending, and twist elastic motions are considered to formulate the system dynamics. The beam structural internal damping is modeled utilizing Rayleigh’s dissipation function. As well, the influence of gravity is considered. A symbolic code is developed to derive the equations of motion, and it is subsequently used to simulate the dynamics of two numerical case studies. The time response results are found to be in an excellent agreement with those reported from the literature. The effects of internal damping and coupling among the elastic motions on the system dynamic response are then investigated.

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Pedro, Jimoh Olarewaju, Aarti Panday, and Laurent Dala. "A nonlinear dynamic inversion-based neurocontroller for unmanned combat aerial vehicles during aerial refuelling." International Journal of Applied Mathematics and Computer Science 23, no. 1 (2013): 75–90. http://dx.doi.org/10.2478/amcs-2013-0007.

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The paper presents the development of modelling and control strategies for a six-degree-of-freedom, unmanned combat aerial vehicle with the inclusion of the centre of gravity position travel during the straight-leg part of an in-flight refuelling manoeuvre. The centre of gravity position travel is found to have a parabolic variation with an increasing mass of aircraft. A nonlinear dynamic inversion-based neurocontroller is designed for the process under investigation. Three radial basis function neural networks are exploited in order to invert the dynamics of the system, one for each control channel. Modal and time-domain analysis results show that the dynamic properties of the aircraft are strongly influenced during aerial refuelling. The effectiveness of the proposed control law is demonstrated through the use of simulation results for an F-16 aircraft. The longitudinal neurocontroller provided interesting results, and performed better than a baseline nonlinear dynamic inversion controller without neural network. On the other hand, the lateral-directional nonlinear dynamic inversion-based neurocontroller did not perform well as the longitudinal controller. It was concluded that the nonlinear dynamic inversion-based neurocontroller could be applied to control an unmanned combat aerial vehicle during aerial refuelling.

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Boughari, Yamina, Ruxandra Mihaela Botez, Georges Ghazi, and Florian Theel. "Flight control clearance of the Cessna Citation X using evolutionary algorithms." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 3 (2016): 510–32. http://dx.doi.org/10.1177/0954410016640821.

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In this paper, an Aircraft Research Flight Simulator equipped with Flight Dynamics Level D (highest level) was used to collect flight test data and develop new controller methodologies. The changes in the aircraft’s mass and center of gravity position are affected by the fuel burn, leading to uncertainties in the aircraft dynamics. A robust controller was designed and optimized using the H∞ method and two different metaheuristic algorithms; in order to ensure acceptable flying qualities within the specified flight envelope despite the presence of uncertainties. The H∞ weighting functions were optimized by using both the genetic algorithm, and the differential evolution algorithm. The differential evolution algorithm revealed high efficiency and gave excellent results in a short time with respect to the genetic algorithm. Good dynamic characteristics for the longitudinal and lateral stability control augmentation systems with a good level of flying qualities were achieved. The optimal controller was used on the Cessna Citation X aircraft linear model for several flight conditions that covered the whole aircraft’s flight envelope. The novelty of the new objective function used in this research is that it combined both time-domain performance criteria and frequency-domain robustness criterion, which led to good level aircraft flying qualities specifications. The use of this new objective function helps to reduce considerably the calculation time of both algorithms, and avoided the use of other computationally more complicated methods. The same fitness function was used in both evolutionary algorithms (differential evolution and genetic algorithm), then their results for the validation of the linear model in the flight points were compared. Finally, robustness analysis was performed to the nonlinear model by varying mass and gravity center position. New tools were developed to validate the results obtained for both linear and nonlinear aircraft models. It was concluded that very good performance of the business Cessna Citation X aircraft was achieved in this research.

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Nakajima, Kazuhisa, Jonathan Wheeler, Gérard Mourou, and Toshiki Tajima. "Novel laser-plasma TeV electron-positron linear colliders." International Journal of Modern Physics A 34, no. 34 (2019): 1943003. http://dx.doi.org/10.1142/s0217751x19430036.

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TeV center-of-mass energy electron-positron linear colliders comprising seamlessly staged capillary laser-plasma accelerators are presented. A moderate intensity laser pulse coupled with the single electromagnetic hybrid mode in a gas-filled capillary can generate plasma waves in the linear regime, where laser wakefields can accelerate equally focused electron and positron beams. In multiple stage capillary accelerators, a particle beam with respect to the laser wakefield can undergo consecutive acceleration up to TeV energies, associated with continuous transverse focusing in a beam size down to a nanometer level, being capable of a promising electron-positron linear collider with very high luminosities of the order of 10[Formula: see text] cm[Formula: see text]s[Formula: see text]. The transverse and longitudinal beam dynamics of beam particles in plasma wakefields with the effects of radiation reaction and multiple Coulomb scattering are investigated numerically to estimate the luminosities in beam-beam collisions with the effects of beamstrahlung radiation and bunch disruption.

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Li, Xiaogao, Ning Zhang, Xianjian Jin, and Nan Chen. "Modeling and Analysis of Vehicle Shimmy with Consideration of the Coupling Effects of Vehicle Body." Shock and Vibration 2019 (March 24, 2019): 1–14. http://dx.doi.org/10.1155/2019/3707416.

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Based on the Lagrange equation, a 9-degrees-of-freedom shimmy model with consideration of the coupling effects between the motions of vehicle body and the shimmy of front wheels and a 5-degrees-of-freedom shimmy model ignoring these coupling effects for a vehicle with double-wishbone independent front suspensions are presented here to study the problem of vehicle shimmy. According to the eigenvalue loci of system’s Jacobian matrix plotted on the complex plane, the Hopf bifurcation characteristics of nonlinear shimmy are studied and the conditions for the generation of limit cycle are analyzed. Numerical calculation and simulation are used to study the dynamic behavior of vehicle shimmy. By comparing the dynamic responses of two different shimmy models, the coupling effects of vehicle body on vehicle shimmy are studied. Finally, the relationship between the amplitude of each DoF and vehicle velocity and the influences of vehicle parameters such as the mass of vehicle body, the longitudinal position of the center of gravity of vehicle body, and the inclination angle of front suspension on shimmy are studied.

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Dissertationen zum Thema "Longitudinal position of center of mass"

Mlynár, Adam. "Konstrukční návrh tříkolového vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445160.

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The goal of this diploma thesis is to create structural design of reverse trike vehicle. With use of vehicle dynamics simulations in software MSC Adams Car 2019 is examining suitability of double wishbone suspension with different roll centre heights and effect of longitudinal position of Centre of mass on ride properties and limits. Selected concept of reverse trike vehicle is structurally designed using Solidworks 2016 and stress is inspected with FEM software Ansys Workbench 2019.

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Kóňa, Marián. "Aerodynamický návrh transsonického bezpilotního kluzáku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232008.

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This master thesis is focused on aerodynamic design of transonic glider, which is assigned for following an airliner at cruising regime of flight. Main goal of the thesis is to determine basic geometrical design of airplane with respect to Whitcomb aera rule, mass analysis and drag polar. Weight analysis includes determining center of gravity according to longitudinal static stability margin. The drag polar of the airplane is determine for cruising regime of flight, that means the regime of following an airliner.

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October, Faith Joy. "Transverse and longitudinal Bose-Einstein correlations in antiproton-proton reactions at centre-of-mass energy 630 GeV." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53200.

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Thesis (MSc)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT: We use Hanbury-Brown Twiss interferometry to determine Bose-Einstein correlations in the transverse and longitudinal directions. By using these two directions, we are able to determine the shape of the pion emitting source. The analysis is done with the UA1 (1985) data for pp collisions at Vs = 630 GeV. Two frames of reference, namely the laboratory frame and the Longitudinal Center-of-Mass System (LCMS) are used. A fit to a two-dimensional Gaussian parametrization yields good results. In the laboratory frame, an oblate form of the source is observed, with the value of the transverse radius (rt) larger than the longitudinal (rL) one. The LCMS analysis finds a prolate form of the source (rt < rL). A few reasons are discussed for the difference in the shape between the different reference frames. Our results are also compared with other hadron-hadron and e+ e: experiments.<br>AFRIKAANSE OPSOMMING: Hanbury-Brown Twiss interferometrie was gebruik om Bose-Einstein korrelasies in die transversale en longitudinale rigtings te bepaal. Deur hierdie twee rigtings te gebruik, kan die vorm van die pion-bron bepaal word. Die UA1 (1985) datastel van die pp botsings by Vs = 630 GeV is gebruik om die analise uit te voer. Twee verwysingstelsels, naamlik die laboratorium stelsel en die Longitudinale Massamiddelpunt-stelsel is aangewend. 'n Passing met 'n twee-dimensionele Gaussiese parametrisering het goeie resultate opgelewer. In die laboratorium stelsel, is 'n ovaalvormige vorm vir die bron waargeneem, met die transversale radius (rt) groter as die longitudinale radius (rl)' Die Longitudinale Massamiddelpunt stelsel het 'n prolate vorm vir die bron voorspel, met rt < ri, 'n Paar redes vir die verskil in die vorm van die pion-bron vir die verskillende verwysingstelsels word bespreek. Ons resultate word ook met ander hadron-hadron en e+e- eksperimente vergelyk.

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Vilas, João Pedro Bento. "Interferometric mapping of test mass surfaces for precise position determination in inertial sensors." Master's thesis, 2018. http://hdl.handle.net/10362/36899.

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Novel inertial reference sensors for space applications using optical readout of a Spherical proof mass (SPM), which enable full drag-free operations, are being studied for future space programs such as Laser Interferometer Space Antenna (LISA) and Big Bang Observer. Using this concept results in the reduction of residual acceleration noise by the proof mass, but with the SPM under rotation the surface topography induces errors in the center of mass position determination due to factors like surface finish, that changes the optical path length on a nanometer scale, and the reflection angle. To determine successfully the center of mass position with picometer accuracy, a surface map of the proof mass is necessary in order to correct the measurement data, thus improving the precision of the position determination. An experimental setup using double heterodyne interferometer in opposing configuration developed by Airbus, Friedrichshafen, is used to map one single surface circumference of a continuously rotating proof mass. In this thesis, enhancements were done to allow a complete surface map of the SPM with picometer accuracy at relevant angular frequencies. Enhancements made were: The inertial-mass degrees of freedom were increased by adding a second rotational stage. Overall software performance has been improved by implementing fast angle read-out by the encoders. Code in LabVIEW and MATLAB has been developed, capable of making a full 2D surface map of the SPM for calibration of errors in the determination of the position of the center of mass. Data acquisition has been sped up to enable low-noise full 2D surface maps.

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Bücher zum Thema "Longitudinal position of center of mass"

The effect of arm movement on the biomechanics of standing up. 1991.

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Carr, Janet H. The effect of arm movement on the biomechanics of standing up. 1991.

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Carr, Janet H. The effect of arm movement on the biomechanics of standing up. 1992.

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The effects of backpack load, the load's position, and different incline gradients on the human body during free speed walking. 1990.

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The effects of backpack load, the load's position, and different incline gradients on the human body during free speed walking. 1988.

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The effects of backpack load, the load's position, and different incline gradients on the human body during free speed walking. 1990.

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The effects of backpack load, the load's position, and different incline gradients on the human body during free speed walking. 1990.

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Buchteile zum Thema "Longitudinal position of center of mass"

Massion, J., L. Mouchnino, and S. Vernazza. "Do Equilibrium Constraints Determine the Center of Mass Position During Movement?" In Multisensory Control of Posture. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1931-7_12.

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Boulic, Ronan, Ramon Mas, and Daniel Thalmann. "Inverse Kinetics for Center of Mass Position Control and Posture Optimization." In Image Processing for Broadcast and Video Production. Springer London, 1995. http://dx.doi.org/10.1007/978-1-4471-3035-2_20.

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Boulic, Ronan, Ramon Mas, and Daniel Thalmann. "Position Control of the Center of Mass for Articulated Figures in Multiple Support." In Eurographics. Springer Vienna, 1995. http://dx.doi.org/10.1007/978-3-7091-9435-5_10.

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Metral, E., G. Rumolo, and W. Herr. "Impedance and Collective Effects." In Particle Physics Reference Library. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34245-6_4.

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AbstractAs the beam intensity increases, the beam can no longer be considered as a collection of non-interacting single particles: in addition to the “single-particle phenomena”, “collective effects” become significant. At low intensity a beam of charged particles moves around an accelerator under the Lorentz force produced by the “external” electromagnetic fields (from the guiding and focusing magnets, RF cavities, etc.). However, the charged particles also interact with themselves (leading to space charge effects) and with their environment, inducing charges and currents in the surrounding structures, which create electromagnetic fields called wake fields. In the ultra-relativistic limit, causality dictates that there can be no electromagnetic field in front of the beam, which explains the term “wake”. It is often useful to examine the frequency content of the wake field (a time domain quantity) by performing a Fourier transformation on it. This leads to the concept of impedance (a frequency domain quantity), which is a complex function of frequency. The charged particles can also interact with other charged particles present in the accelerator (leading to two-stream effects, and in particular to electron cloud effects in positron/hadron machines) and with the counter-rotating beam in a collider (leading to beam–beam effects). As the beam intensity increases, all these “perturbations” should be properly quantified and the motion of the charged particles will eventually still be governed by the Lorentz force but using the total electromagnetic fields, which are the sum of the external and perturbation fields. Note that in some cases a perturbative treatment is not sufficient and the problem has to be solved self consistently. These perturbations can lead to both incoherent (i.e. of a single particle) and coherent (i.e. of the centre of mass) effects, in the longitudinal and in one or both transverse directions, leading to beam quality degradation or even partial or total beam losses. Fortunately, stabilising mechanisms exist, such as Landau damping, electronic feedback systems and linear coupling between the transverse planes (as in the case of a transverse coherent instability, one plane is usually more critical than the other).

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"Space-Fixed Position, Velocity, and Acceleration Vectors of a Landed Spacecraft Relative to Center of Mass of Planet, Planetary System, or the Moon." In Formulation for Observed and Computed Values of Deep Space Network Data Types for Navigation. John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/0471728470.ch6.

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Goldfinger, Eliot. "Basic Body Plan General Overview." In Animal Anatomy for Artists. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780195142143.003.0009.

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There is a basic body plan common to most of the animals presented in this book. At its most obvious, they all have a head, a body, and four limbs. Most are four-legged and stand on all fours, and are described as having front limbs and rear limbs. The front limb is anatomically equivalent to the arm and hand in humans and primates, and the rear limb to the human lower limb. The animals in this book are surprisingly similar in many ways. The head is connected to the rib cage by the neck vertebrae and the rib cage is connected to the pelvis by the lumbar vertebrae. The two front limbs are connected to the rib cage, and the two rear limbs are connected to the pelvis. These units move in relation to one another, establishing the stance, or pose, of an animal. Animals differ primarily in the shape and relative proportions of these structural units, in the position of the wrist, heel, and toe bones when standing and walking, and by the number of their toes. An animal can be visualized as being constructed of a series of simplified, three-dimensional, somewhat geometric volumes (head, forearm, thigh). Each of these volumes has one dimension that is longer than the others. A line projected through the center of the mass of this volume on its longest dimension is called its axis (plural, axes). For the most part, especially in the limbs, these axes follow the skeleton, so that a line drawn through the long dimension of a bone is on, or close to, the axis of the volume of that region (for example, the position of the radius is close to the axis of the forearm). One of the more confusing regions of the body is the volume of the upper arm. The humerus (upper arm bone) is mostly deeply buried in muscle, and lies toward the front of this muscle mass, with the massive triceps muscle located at its rear.

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Badler, Norman I., Cary B. Phillips, and Bonnie Lynn Webber. "Behavioral Control." In Simulating Humans. Oxford University Press, 1993. http://dx.doi.org/10.1093/oso/9780195073591.003.0007.

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The behaviors constitute a powerful vocabulary for postural control. The manipulation commands provide the stimuli; the behaviors determine the response. The rationale for using behavioral animation is its economy of description: a simple input from the user can generate very complex and realistic motion. By defining a simple set of rules for how objects behave, the user can control the objects through a much more intuitive and efficient language because much of the motion is generated automatically. Several systems have used the notion of behaviors to describe and generate motion [Zel91]. The most prominent of this work is by Craig Reynolds, who used the notion of behavior models to generate animations of flocks of birds and schools of fish [Rey87]. The individual birds and fish operate using a simple set of rules which tell them how to react to the movement of the neighboring animals and the features of the environment. Some global parameters also guide the movement of the entire flock. William Reeves used the same basic idea but applied it very small inanimate objects, and he dubbed the result particle systems [Ree83]. Behaviors have also been applied to articulated figures. McKenna and Zeltzer [MPZ90] describe a computational environment for simulating virtual actors, principally designed to simulate an insect (a cockroach in particular) for animation purposes. Most of the action of the roach is in walking, and a gait controller generates the walking motion. Reflexes can modify the basic gait patterns. The stepping reflex triggers a leg to step if its upper body rotates beyond a certain angle. The load bearing reflex inhibits stepping if the leg is supporting the body. The over-reach reflex triggers a leg to move if it becomes over-extended. The system uses inverse kinematics to position the legs. Jack controls bipedal locomotion in a similar fashion (Section 5), but for now we focus on simpler though dramatically important postural behaviors. The human figure in its natural state has constraints on its toes, heels, knees, pelvis, center of mass, hands, elbows, head and eyes. They correspond loosely to the columns of the staff in Labanotation, which designate the different parts of the body.

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Konferenzberichte zum Thema "Longitudinal position of center of mass"

Batra, Mohit, John McPhee, and Nasser L. Azad. "Parameter Identification for a Longitudinal Dynamics Model Based on Road Tests of an Electric Vehicle." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59732.

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This paper presents a method to estimate the parameters of a longitudinal dynamic model using on-road testing of an electric vehicle. Data acquisition was undertaken on our test vehicle, a Toyota Rav4EV 2012, by collating signals from three different sources: Vehicle Measurement System (VMS) (consisting of wheel force, torque, wheel spin, wheel speed and position sensors), Global Positioning System (GPS) and the Controller Area Network (CAN) of the vehicle. A MATLAB/Simulink based non-linear least square parameter estimation algorithm was used to identify the vehicle parameters including the mass, location of center of gravity, frontal area, coefficient of drag, wheel inertia and road load parameters of the vehicle. A 14 degrees of freedom (DOF), longitudinal dynamics model of the Rav4EV was developed in the MapleSim software using the estimated parameters. The accuracy of the identified parameters and the model was validated by comparing the model output against the experimental data.

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Doria, Alberto, Valerio Favaron, and Sergio Roa. "A DOE Approach for Evaluating the Effect of Bicycle Properties on Stability." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67225.

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The effect on stability of mass, geometric and stiffness parameters of a bicycle with compliant frame, fork and wheel is studied. Critical stiffnesses of the structural elements are identified by means of specific experimental tests based on modal analysis and static stiffness measurement. Numerical stability analysis is carried out by means of a MATLAB code and simulations are planned with the design of experiment (DOE) approach. Numerical results show that the rigid body properties that have the main influence on self-stability are front wheel radius, longitudinal position of the center of mass and trail. Compliance of structural elements has a small effect on self-stability, but causes the appearance of a wobble mode that may be unstable at high speed.

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Shirazi, K. H., S. M. M. Jaafari, M. Derakhshan, and R. Shafie. "Road-Holding and Ride Performance Optimization Using Bee’s Algorithm." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63398.

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This paper provides a method for optimal synthesis of the passenger cars suspension system to obtain the best road-holding as well as ride-comfort characteristics. The longitudinal vehicle model consists of sprung and unsprung masses, tire-ground interaction model, and suspension system kinematics. Defining the non-dimensional parameters the equations of motion of the system are derived in the non-dimensional form. Several objective functions are defined for the optimization of road-holding and ride comfort characteristics based on the transient and steady-state response of the sprung mass, respectively. The optimization variables are position of instant centers of rotation of the wheels with respect to the sprung mass. Bee’s algorithm is used to obtain the solutions of the problem. The best position for the instant centers of front and rear suspension linkages are obtained and compared with 100% anti-squat line.

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Rim, HyungJin, Sungpil Yoon, Bob Schutz, and Charles Webb. "Effect of Center of Mass Position Error on ICESat Precision Orbit Determination." In AIAA/AAS Astrodynamics Specialist Conference. American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-7977.

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McNair, S. Lauren, and Steven Tragesser. "Dynamics of a Thrusting, Spinning Satellite with Changing Center of Mass Position." In AIAA/AAS Astrodynamics Specialist Conference. American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-5014.

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Chen, Lin, Guohua Liu, Hang Dong, Son Hoang, and Songyi Dian. "Position control on center of mass for a power lines inspection robot." In 2016 35th Chinese Control Conference (CCC). IEEE, 2016. http://dx.doi.org/10.1109/chicc.2016.7554305.

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Sygulla, Felix, Robert Wittmann, Philipp Seiwald, Arne-Christoph Hildebrandt, Daniel Wahrmann, and Daniel Rixen. "Hybrid position/force control for biped robot stabilization with integrated center of mass dynamics." In 2017 IEEE-RAS 17th International Conference on Humanoid Robotics (Humanoids). IEEE, 2017. http://dx.doi.org/10.1109/humanoids.2017.8246955.

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Miyoshi, T., H. Yamamoto, S. I. Yamamoto, H. Koyama, and T. Komeda. "Muscle Movements Depend On Position Of The Center-Of-Mass Relative To The Ankle Center Of Rotation In Humans." In 2007 IEEE/ICME International Conference on Complex Medical Engineering. IEEE, 2007. http://dx.doi.org/10.1109/iccme.2007.4381945.

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Gilbert, Michael G., Daniel A. Godrick, and Richard H. Klein. "The Effect of Longitudinal Center of Gravity Position on the Sway Stability of a Small Cargo Trailer." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66022.

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Small and mid-sized cargo trailers are often used to transport goods by people with limited experience in loading trailers and driving vehicles with trailers attached. This paper examines the effect of front to rear load position on the stability of a trailer by measuring its dynamic response to a variety of steer inputs at several different highway speeds. Additionally, tests with varying steers and speeds were performed with a simulated suspension malfunction to study the trailer’s dynamic response to this condition. Trailer sway has been a well-documented trailer characteristic for decades. However there are no special driver’s licensing or mandatory training requirements for even large trailers and campers. The trailer chosen for this test was a lightweight double axle cargo trailer commonly rented by people with limited to no towing experience. This consumer is likely to be unfamiliar with the best practices of trailer loading. This consumer is also likely a non-professional driver with little to no towing experience in the event of encountering unexpected trailer sway. Therefore it was the goal of the authors to determine how the stability of this type of trailer varies with different front to rear loading conditions and speeds to see if it is safe to operate on the highways by novice drivers. Trailer sway stability was determined by measuring the trailer sway (articulation) response during repeated, pulse steer tests. The trailer sway damping characteristics were measured, as a “damping ratio”, for six different hitch loads that corresponded to six different longitudinal loading conditions. These conditions, expressed as % load forward of the trailer centerline / % load aft of the trailer centerline were: 65/35, 60/40, 55/45, 50/50, 45/55, and 40/60. These loading conditions were tested per SAE J2664 [1] protocol. The resulting trailer sway characteristics for each loading condition then were compared to published trailer sway stability criteria [2, 3] to determine the suitability of this particular tow vehicle-trailer combination for use by the public in a rental market. The impact of a suspension malfunction on the trailer stability was also studied. This consisted of a detachment of one rear leaf spring hanger.

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Huang, Xiaoyu, and Junmin Wang. "EKF-Based Vehicle Center of Gravity Position Real-Time Estimation in Longitudinal Maneuvers With Road Course Elevation." In ASME 2012 5th Annual Dynamic Systems and Control Conference joint with the JSME 2012 11th Motion and Vibration Conference. ASME, 2012. http://dx.doi.org/10.1115/dscc2012-movic2012-8530.

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