Thematische Bibliographien / Force and displacement control method

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Auswahl der wissenschaftlichen Literatur zum Thema „Force and displacement control method“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 5. Februar 2022

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Zeitschriftenartikel zum Thema "Force and displacement control method"

Albassam, Bassam A. „Creating Nodes at Selected Locations in a Harmonically Excited Structure Using Feedback Control and Green’s Function“. Shock and Vibration 2019 (07.02.2019): 1–20. http://dx.doi.org/10.1155/2019/3261628.

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The paper deals with designing a control force to create nodal point(s) having zero displacements and/or zero slopes at selected locations in a harmonically excited vibrating structure. It is shown that the steady-state vibrations at desired points can be eliminated using feedback control forces. These control forces are constructed from displacement and/or velocity measurements using sensors located either at the control force position or at some other locations. Dynamic Green’s function is exploited to derive a simple and exact closed from expression for the control force. Under a certain condition, this control force can be generated using passive elements such as springs and dampers. Numerical examples demonstrate the applicability of the method in various cases.

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Wang, Hao, Zhiying Lv, Hongyu Qin, Jianwei Yue und Jianwei Zhang. „Deformation Control Method of the Antislide Pile under Trapezoidal Load in the Zhangjiawan Landslide“. Advances in Civil Engineering 2020 (08.07.2020): 1–14. http://dx.doi.org/10.1155/2020/1405610.

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Antislide piles are set in the Zhangjiawan landslide area, where the general features of the bedrock below the slip surface include upper weak and lower hard strata. Based on a site investigation, the horizontal displacement of the antislide pile head is 14.8 cm, which is not conducive to the stability of the landslide. In the study, a displacement calculation method for the pile under trapezoidal load is proposed for a colluvial landslide controlling. Furthermore, factors affecting the deformation and internal forces of the pile were also studied. The results indicated that (1) when the embedded length of an antislide pile increases, the horizontal displacement on the pile and maximum absolute shear force decrease, while the bending moment of the pile exhibits opposite trends; (2) the relationship between maximum shear force and maximum bending moment is linear with increasing driving force of landslide; and (3) increase in the ratio of the driving force between the pile head and slip surface (q0/q1) steadily increases the horizontal displacement of the pile. The relationship between the distribution of the driving force (q0/q1) and the reasonable embedded length of a pile is a quadratic function, which can be used to determine the reasonable embedded length of a pile under the action of rectangular or triangular loads. It is very useful to use the above method to guide the design of antislide piles in similar areas.

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Shon, Su-Deok, Alan S. K. Kwan und Seung-Jae Lee. „Displacement Control Technique of Pre-stressable Cable Structures by Force Method“. Journal of the Korean Association for Spatial Structures 11, Nr. 2 (15.06.2011): 139–49. http://dx.doi.org/10.9712/kass.2011.11.2.139.

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Ma, Niu Jing. „An Incremental Method for Cable Force Tuning of the Concrete Cable-Stayed Bridge Considering Cable-Girder Temperature Difference Effect“. Applied Mechanics and Materials 477-478 (Dezember 2013): 690–96. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.690.

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To ensure that the cable force tuning of Banfu No.2 bridge was carried out successfully, an incremental method for cable force tuning was presented, which took into account the cable-girder temperature difference. The cable forces were measured through frequency method. Before cable force tuning, all cable forces and temperatures of cables and girders were measured when the ambient temperature was stable, and these cable forces were taken as reference cable forces. During cable force tuning, the increment of cable force was regarded as the control quantity, while the displacement in the middle of main span was regarded as the verification quantity. After each stage, it was necessary to measure the temperatures of cables and girders and the displacement variation in the middle of the main span. To ensure the mechanical state of bridge was in control, all cable forces were measured after the 5th, 10th pairs of cables and all cables were tuned. In addition, the temperature-corrected cable forces were compared with the calculated ones, which showed the incremental method was not only accurate but also efficient.

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Wang, Hao, Peng Wang, Hongyu Qin, Jianwei Yue und Jianwei Zhang. „Method to Control the Deformation of Anti-Slide Piles in Zhenzilin Landslide“. Applied Sciences 10, Nr. 8 (19.04.2020): 2831. http://dx.doi.org/10.3390/app10082831.

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Anti-slide piles were used in the region of the Zhenzilin landslide in Sichuan, China. The horizontal displacement of these piles exceeds specifications. Deterioration in bedrock properties may cause deformation, thereby causing landslide destabilization. An approach was developed for the analysis of anti-slide pile in two bedrocks with different strengths below the slip surface. A relationship has been established between the modulus of subgrade reaction of the first weak bedrock and reasonable embedded length for landfill slopes with strata of various strengths. Furthermore, the influence of embedding length on deformation has been studied to determine the reasonable embedded length, which helps reduce deformation and ensure landslide stability. The results reveal that (1) at a constant embedded length, horizontal displacement increases with the thickness of the first soft bedrock, meanwhile the maximum shear force remains constant, and the bending moment first increases followed by subsequent decrease; (2) with an increase in the embedded length, horizontal displacement and the maximum shear force of the pile in the embedded bedrock decrease, whereas the bending moment increases; (3) the maximum internal forces and horizontal displacement increase with a decrease in the subgrade reaction modulus of the first weak rock; and (4) the reasonable embedded length of an anti-slide pile increases with a decrease in the subgrade reaction modulus of the first weak bedrock. The proposed approach can be employed to design anti-slide piles in similar landslide regions to control pile-head deformation.

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Wei, Wei, Zhi Dong Yang, Jun Wei Han und Ting Gao. „Internal Force Decoupling Control of Hyper-Redundant Shaking Table Based on Stiffness Matrix“. Applied Mechanics and Materials 681 (Oktober 2014): 115–20. http://dx.doi.org/10.4028/www.scientific.net/amm.681.115.

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A novel internal force decoupling control strategy of hyper-redundant shaking table based on stiffness matrix is proposed in this paper. The linear models of electro-hydraulic servo system and mechanical system are built by considering the shaking table moving in a small range around the zero point. Internal forces are given through a transformation of cylinder forces which can be acquired from the pressure sensors. By meshing top platform of the shaking table in different directions, the stiffness matrix between the redundancy displacements and internal forces are given through dynamics equations including inertia and shear parts. The IFDC controller is designed to feedback the redundancy displacement caused by internal forces to the input current of the servovalve. Simulation results show that the proposed method is capable to reduce internal forces effectively.

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Tan, Xiao Jing, und Bin Wu. „Mixed Force and Displacement Control Strategy in Pseudo-Dynamic Tests for Structures with Large Stiffness“. Advanced Materials Research 639-640 (Januar 2013): 1133–36. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.1133.

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Pseudo-dynamic testing using force- mixed control strategy is presented for structures with large stiffness. In this proposed method, the displacement response of the specimen measured by a linear variable displacement transducer with higher resolution than that in the actuator is fed back. A proportional-integral controller is adopted in the outer displacement control loop, and a coefficient CF is employed to convert the displacement to force command. Numerical and experimental validations show that this method exhibits excellent performance in terms of stability and accuracy if proper controller parameters are adopted and is superior to the conventional displacement control method for large-stiffness structures.

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He, Xiaodong, Xiuchang Huang und Hongxing Hua. „Performance of a friction ring DVA for vibration control of a flywheel“. INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, Nr. 4 (01.08.2021): 2449–57. http://dx.doi.org/10.3397/in-2021-2140.

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A flexible ring DVA with friction contact interfaces (essentially a viscoelastic-friction DVA) is proposed to suppress vibration of a flywheel, two other cases are also studied, i.e., viscoelastic DVA and friction DVA. Based on an equivalent 3 degrees of freedom (DOFs) dynamic model, displacement response of the flywheel-DVA are obtained by using harmonic balance method (HBM). It is shown that all three types of DVA can suppress vibration of the flywheel effectively, bandwidth of the viscoelastic-friction DVA is enlarged due to the existence of friction interface. Performances of the DVA are evaluated by analyzing the displacement responses and forces (i.e., spring force, damping force and friction force). It is shown that the frequency corresponding to the turning point on the response curve is the critical frequency at which dynamic vibration absorption takes place, and it is also the frequency at which the friction force begins to take effect. In the process of emergence and disappearance of the dynamic vibration absorption, the friction force plays a role similar to a "switch"

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Karimpour, Babak, Ali Keyhani und Javad Alamatian. „New Active Control Method Based on Using Multiactuators and Sensors Considering Uncertainty of Parameters“. Advances in Civil Engineering 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/180673.

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New approach is presented for controlling the structural vibrations. The proposed active control method is based on structural dynamics theories in which multiactuators and sensors are utilized. Each actuator force is modeled as an equivalent viscous damper so that several lower vibration modes are damped critically. This subject is achieved by simple mathematical formulation. The proposed method does not depend on the type of dynamic load and it could be applied to control structures with multidegrees of freedom. For numerical verification of proposed method, several criterions such as maximum displacement, maximum kinetic energy, maximum drift, and time history of controlled force and displacement are evaluated in two- , five- , and seven-story shear buildings, subjected to the harmonic load, impact force, and the Elcentro base excitation. This study shows that the proposed method has suitable efficiency for reducing structural vibrations. Moreover, the uncertainty effect of different parameters is investigated here.

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Liu, Cheng Qing, Jun Jun Li, Chi Chen, Zhi Bin Tu, Xiao Dan Sun und Bin He. „Analysis and Research on Reinforcement and Reconstruction Method of Adding Shear Wall for Multi-Story Frame Structure“. Applied Mechanics and Materials 351-352 (August 2013): 442–45. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.442.

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Recently, earthquakes occurred frequently, and our country has established a new seismic code. As the seismic intensity increases, some low frame structures cannot reach the requirements of layer displacement, layer displacement angle, stability, etc. Thus, they require reinforcement. The shear wall is good for resisting lateral force, and rational shear wall can control the shifting and shaking efficiently, thus making the distribution of internal force more reasonable. Through analysis on reinforcement and reconstruction method of adding shear walls for multi-story frame structure, the rules in terms of different layer displacement, layer displacement angle and overturning moment are found out, and the added shear wall, which can efficiently improve seismic fortification intensity, can serve as the main component for resisting lateral force. The conclusions are as follows: under earthquake action, through the method of adding shear wall, the deformation, layer displacement and layer displacement angle can be controlled effectively. Besides, the integrity and seismic behavior are inhanced, achieving the goal of improving anti-seismic grade of structure.

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Dissertationen zum Thema "Force and displacement control method"

Fatemi, Hassan. „Investigation of the higher mode effects on the dynamic behaviour of reinforced concrete shear walls through a pseudo-dynamic hybrid test“. Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11221.

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La plupart des bâtiments de moyenne et grande hauteur en béton armé sont munis de murs de refend ductiles afin résister aux charges latérales dues au vent et aux séismes. Les murs de refend ductiles sont conçus selon des règles conception stricts. Ces murs sont généralement conçus de façon à forcer la formation d’une rotule plastique à leur base dans l’éventualité d’un séismemajeur. Lors de la conception d’un mur, l’enveloppe des moments fléchissants ainsi que l’enveloppe des efforts tranchants dans la portion du mur situé au-dessus de la rotule plastique sont basés sur la résistance probable en flexion du mur dans la région de la rotule plastique. Plusieurs études sur les murs de refend conçus selon cette philosophie de conception on fait le constat que l’effort tranchant maximum dans un mur peut être sous-estimé lors d’un séisme, et que des rotules plastiques peuvent également se former à d’autres endroits qu’à la base du mur, ce qui constitue un mécanisme de ruine indésirable. Ces effets sont principalement attribuables à la contribution des modes supérieures à la réponse dynamique globale des bâtiments lors d’un séisme. L’effet des modes supérieurs est particulièrement important dans les bâtiments élancés de grande hauteur ayant une période propre de vibration longue. L’essai pseudo-dynamique avec sous-structure est uneméthode efficace et économique d’évaluer expérimentalement l’effet des modes supérieurs sur le comportement sismique des murs de refend dans les bâtiments. Lors de tels essais, comme la masse du bâtiment est modélisée numériquement, ceci permet de tester des structures à de relativement grandes échelles sans avoir à combattremécaniquement les forces d’inerties générées lors d’un séisme. Dans le cadre de la présente étude, la portion constituant la base d’un mur de refend correspondant à la zone de rotule plastique faisant partie d’un bâtiment de huit étages à l’échelle 1/2,75 a été testé. Les dimensions générales de la portion de mur testée étaient de 1800 mm de longueur, par 2200 mm de hauteur par 160 mm d’épaisseur. Le mur étudié a été conçu selon l’édition 2015 du Code National du Bâtiment du Canada (CNBC 2015) ainsi que selon la norme CSA A23.3-14 (Calcul des ouvrages en béton), où le facteur d’amplification de l’effort tranchant causé par l’effet des modes supérieurs n’a pas été pris en compte. Lors des essais pseudo-dynamiques avec sous-structure, une nouvelle méthode de contrôle à trois degrés de liberté convenant à des spécimens d’essai très rigides axialement a été développée et validée. Une procédure novatrice de redémarrage d’un essai interrompu en cours de route a également été développée et validée. Lors des essais, le bâtiment de huit étages incluant la portion de mur dans le laboratoire a été soumis à trois séismes. Le premier séisme était de très faible intensité, l’intensité du deuxième séisme correspondait au séisme de conception, et le troisième séisme correspondait au séisme de conception dont l’intensité a été doublé. Durant les deux séismes de forte intensité, le mur testé s’est comporté de manière ductile et des fissures de cisaillement et de flexion importantes ont été observées. Même si l’effort tranchant maximum mesuré durant le séisme de conception a atteint 2,16 fois la valeur de conception du mur, et 3,01 fois la valeur de conception du mur dans le cas du séisme amplifié, aucun mécanisme de ruine n’a été observé. Suite aux essais pseudo-dynamiques avec sous-structure, un essai par poussée progressive a également été effectué. Les résultats des essais pseudo-dynamiques avec sous-structure portent à croire que la valeur de l’effort tranchant de conception d’un mur selon la norme CSA A23.3-14 est sous-estimé. De plus, l’essai poussée progressive a permis de démontrer que lemur était beaucoup plus résistant qu’anticipé, puisque l’effort tranchant avait été sous-estimé lors de la conception. L’essai par poussée progressive a également permis de démontrer que le mur peut atteindre des niveaux de ductilité en déplacement supérieur à celui prévu par la norme CSA A23.3-14.
Abstract: Most mid- and high-rise reinforced concrete (RC) buildings rely on RC structural walls as their seismic force resisting system. Ductile RC structural walls (commonly called shear walls) designed according to modern building codes are typically detailed to undergo plastic hinging at their base. Both the design moment envelope for the remaining portion of the wall and the design shear forces are evaluated based on the probable flexural resistance of the wall in the plastic hinge region. Several analytical studies have shown that so-designed structural walls can be subjected to shear forces in excess of the design values. Plastic hinging can also develop in the upper portion of the walls. These effects are mainly attributed to higher mode response and, hence, are more severe in taller or slender walls with long fundamental periods. Considering the literature, there is a significant uncertainty regarding the behavior of the structural walls under the higher mode of vibrations excited under earthquake excitations. Hybrid testing is an effective experimentalmethod to study the natural behaviour of structures such as shear walls. The hybrid testing method enables the simulation of the seismic response of large structural elements like RC shear walls without the need to include large masses typically encountered in multi-storey buildings. In this study a barbell shaped RC shear wall specimen of 1800mm in length including a 300mm × 300mm boundary element at each end that is 2200mm in height, and 160mm thick was investigated. A test specimen corresponding to the base plastic hinge zone of an 8-storey shear wall was tested in a laboratory evolvement whilst the reminder of the building structure was modeled numerically. The reference wall was scaled down by a factor of 1/2.75 to obtain dimensions of the test specimen. The RC wall was designed in accordance with the 2015 edition of the National Building Code of Canada (NBCC 2015) and the Canadian Standard Association A23.3-14 code. The amplification of the base design shear force accounting for the inelastic effects of higher modes specified by the CSAA23.3-14 standard was not taken into account in order to evaluate the amplification experimentally. In order to investigate the response of ductile RC walls under earthquake ground motions and track the effect of the higher vibration modes on the shear force demand, three earthquakes with different intensities were applied on the hybrid model successively. The RC wall exhibited a ductile behaviour under the ground motions and flexural and shear cracks developed all over the height of the wall. In spite of amplifying the shear force demand by a factor of 2.16 under the design level earthquake and 3.01 under a high intensity earthquake, no shear failure was observed. The test results indicated that the amplification of the design shear forces at the base of ductile RC shear walls are underestimated by the CSAA23.3-14 standard. A new method for controlling three degrees of freedomin hybrid simulation of the earthquake response of stiff specimens was developed and verified in this study. Also, an innovative procedure to restore an interrupted hybrid test was programmed and verified. The hybrid tests were followed by a push-over test under a lateral force distribution equal to the square root of sum of the squares of the first five modes in order to evaluate the displacement ductility of the RC wall. Findings of the final push-over test showed that the tested ductile RC wall can withstand higher displacement ductilities than the presented levels in the NBCC 2015.

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McPherson, Timothy Steven. „A force and displacement self-sensing method for a mri compatible tweezer end effector“. Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44829.

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This work describes a self-sensing technique for a piezoelectrically driven MRI-compatible tweezer style end effector, suitable for robot assisted, MRI guided surgery. Nested strain amplification mechanisms are used to amplify the displacement of the piezo actuators to practical levels for robotics. By using a hysteretic piezoelectric model and a two port network model for the compliant nested strain amplifiers, it is shown that force and displacement at the tweezer tip can be estimated if the input voltage and charge are measured. One piezo unit is used simultaneously as a sensor and an actuator, preserving the full actuation capability of the device. Experimental validation shows an average of 12% error between the self-sensed and true values.

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Nayak, Subrat. „Development of a 6 DOF compliant parallel mechanism to sense and control the force-torque and displacement of a serial robot manipulator“. [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041273.

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Zhang, Ting. „Numerical modelling of deformation within accretionary prisms“. Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176502.

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A two dimensional continuous numerical model based on Discrete Element Method is used to investigate the behaviour of accretionary wedges with different basal frictions. The models are based on elastic-plastic, brittle material and computational granular dynamics, and several characteristics of the influence of the basal friction are analysed. The model results illustrate that the wedge’s deformation and geometry, for example, fracture geometry, the compression force, area loss, displacement, height and length of the accretionary wedge etc., are strongly influenced by the basal friction. In general, the resulting wedge grows steeper, shorter and higher, and the compression force is larger when shortened above a larger friction basement. Especially, when there is no basal friction, several symmetrical wedges will distribute symmetrically in the domain. The distribution of the internal stress when a new accretionary prime is forming is also studied. The results illustrate that when the stress in a certain zone is larger than a critical number, a new thrust will form there.

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Toyooka, Akihiro. „Development of the Inertia Force Driven Hybrid Loading System and Pseudo-Negative Stiffness Control Method for a MR Damper“. 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/77750.

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Maines, Nathan Louis. „Use of the Discrete Vortex Method to Calculate Wind Loads over a Surface-Mounted Prism and a Bridge Cross-Section with Flaps“. Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/32952.

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This thesis aims at presenting the Discrete Vortex Method (DVM) as a tool to determine the flow field and associated wind loads over structures. Two structures are considered: the first is a surface-mounted prism and is used to simulate wind loads over low-rise structures. The second is a bridge section with attached flaps that can be oriented to vary the moment coefficient. Advantages and disadvantages of using DVM for these applications are discussed. For the surface-mounted prism, the results show that the developed code correctly predicts the flow separation around the corners. As for the surface pressures, it is concluded that parallel processing, which could be easily implemented for DVM, should be used to correctly predict surface pressures and their variations. This is due to the required slow time advancement of the computations. The results on attaching flaps to bridge sections yield required orientations to minimize moments under different angles of attack.
Master of Science

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Li, Chen. „A simple and low cost anti-lock braking system control method using in-wheel force sensor and wheel angular speed sensor“. Thesis, Coventry University, 2017. http://curve.coventry.ac.uk/open/items/aebcb301-fec5-4684-945c-020817157509/1.

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The ABS (Anti-lock Braking System) is an active safety system that is designed for emergency braking situations. In an emergency braking scenario, the ABS instructs the disk-pad braking force to achieve the maximum available tyre-road braking force without locking the wheels. The maximum available tyre-road braking force helps to achieve the optimal braking distance, while the rotating wheels allow the vehicle to retain directional control capability, which allows the driver to avoid dangerous obstacles during an emergency braking scenario. This research has delivered a new and novel approach to ABS design, which could be developed at a low cost in a way which will benefit specialist and niche vehicle manufacturers alike. The proposed ABS control method combines the control logic from both theory-based ABS and commercialised ABS. Therefore, it is more practical compared to the theory-based ABS and less complex compared to a commercialised ABS. The control method only has two control phases with simple decrease, hold, and increase control actions. The proposed ABS control method uses representable tyre-road braking force data from an in-wheel-hub force measurement sensor as well as wheel angular acceleration data from a wheel angular speed sensor as control references. It uses the detected peak tyre-road braking force and its relative predefined drop percentage as control activation and control phase alternation triggers. It uses wheel angular acceleration to identify the control phase and implement the correct control actions. Zero wheel angular acceleration is used to trigger the hold control action in the first control phase, while wheel angular acceleration is used as an aid to increase the accuracy of the in-wheel-hub force sensor. An ADAMS full vehicle model based on a Subaru Impreza and a Simulink ABS control logic model have been used to establish a co-simulation environment to test the performance of the proposed ABS control method using high, low friction and split-mu road surfaces. The co-simulation results demonstrate that the proposed novel ABS control method satisfies the ABS control target, and its control results are similar to commercialised ABS.

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Venkatesan, Nishant. „AN EVALUATION OF THE TRAVELING WAVE ULTRASONIC MOTOR FOR FORCE FEEDBACK APPLICATIONS“. UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_theses/575.

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The traveling wave ultrasonic motor is considered for use in haptic devices where a certain input-output relation is desired between the applied force and the resulting motion. Historically, DC motors have been the standard choice for this purpose. Owing to its unique characteristics, the ultrasonic motors have been considered an attractive alternative. However, there are some limitations when using the ultrasonic motor for force-feedback applications. In particular, direct torque control is difficult, and the motor can only supply torque in the direction of motion. To accommodate these limitations we developed an indirect control approach. The experimental results demonstrate that the model reference control method was able to approximate a second order spring-damper system.

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伊藤, 睦., Atsushi ITOH, Kongkeo PHAMAVANH, 光. 中村, Hikaru NAKAMURA, 忠顕田辺 und Tada-aki TANABE. „格子等価連続体化法による鉄筋コンクリート部材の有限要素解析“. 土木学会, 2004. http://hdl.handle.net/2237/8616.

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ANDO, Hiroki, 大樹安藤, Takeshi SAKAI, 猛. 酒井, Goro OBINATA und 五郎大日方. „磁気記録評価装置用変位拡大位置決め制御機構の機構形状とコントローラの統合化設計“. 日本機械学会, 2006. http://hdl.handle.net/2237/8963.

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Bücher zum Thema "Force and displacement control method"

Yang, Zhiyong, Wenjin Gu, Jing Zhang und Lihua Gui. Force Control Theory and Method of Human Load Carrying Exoskeleton Suit. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54144-9.

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Ernst, H. A. Elastic plastic fracture mechanics methodology for surface cracks: Second semiannual report, contract MSFC control no. 91-78. Huntsville, AL: NASA Marshall Space Flight Center, 1993.

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Office, General Accounting. Financial management: Improvements needed in OSMRE's method of allocating obligations : report to the chairman, Subcommittee on Environment, Energy, and Natural Resources, Committee on Government Operations, House of Representatives. Washington, D.C: The Office, 1989.

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Laszlo, Berke, Gallagher Richard H und United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., Hrsg. Integrated force method versus displacement method for finite element analysis. [Washington, D.C.]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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Griffis, Michael William. Kinestatic control: A novel theory for simultaneously regulating force and displacement. 1991.

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Force Control Theory and Method of Human Load Carrying Exoskeleton Suit. Springer, 2018.

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Vaez-Zadeh, Sadegh. Rotor Position and Speed Estimation. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198742968.003.0006.

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The ultimate importance of rotor position and speed information in permanent magnet synchronous (PMS) machines control, and the industry interest to the rotor and speed sensorless systems as a cost-saving and practical alternative to the motor control with mechanical sensors are emphasized. Major position and speed estimation schemes are then presented in detail. These are the: back electromotive force (EMF)-based method; flux linkage method; hypothesis rotor position method; saliency-based method, including high frequency signal injection and inverter switching harmonics schemes; and finally, the observer-based method, including state observer and extended Kalman filter-based schemes. Each scheme was discussed by presenting the corresponding fundamental principles, followed by the appropriate motor model, estimation procedure, and the implementation. Demanding criteria such as accuracy, robustness, swiftness, and capability of working over the entire range of motor operation are discussed with each method.

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Buchteile zum Thema "Force and displacement control method"

Erb, Richard, Matthew Stehman und Narutoshi Nakata. „Mixed Force and Displacement Control for Base-Isolation Bearings in RTHS“. In Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry, Volume 8, 323–32. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30084-9_30.

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Yang, Zhiyong, Wenjin Gu, Jing Zhang und Lihua Gui. „Direct Force Control of Exoskeleton Suit“. In Force Control Theory and Method of Human Load Carrying Exoskeleton Suit, 103–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54144-9_4.

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Oyama, Takashi, und Teruaki Ito. „Motor Control of Hand Force for Visual Indicator Without Hand Displacement“. In Advances in Industrial Design, 907–12. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51194-4_117.

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Kaneko, Seitaro, und Hiroyuki Kajimoto. „Method of Observing Finger Skin Displacement on a Textured Surface Using Index Matching“. In Haptics: Perception, Devices, Control, and Applications, 147–55. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42324-1_15.

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Yang, Zhiyong, Wenjin Gu, Jing Zhang und Lihua Gui. „Impedance Control of Exoskeleton Suit“. In Force Control Theory and Method of Human Load Carrying Exoskeleton Suit, 159–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54144-9_6.

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An, Xiangyang, J. Z. Zhang und X. Zhang. „Variational Force/Displacement Method for Analyzing Mode II Crack by Double Cantilever Beam Model“. In Lecture Notes in Electrical Engineering, 2793–810. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3305-7_226.

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Yang, Zhiyong, Wenjin Gu, Jing Zhang und Lihua Gui. „Sensitivity Amplification Control of Exoskeleton Suit“. In Force Control Theory and Method of Human Load Carrying Exoskeleton Suit, 73–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54144-9_3.

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Yang, Zhiyong, Wenjin Gu, Jing Zhang und Lihua Gui. „Force Control of Exoskeleton Suit Based on Inner Position Loop“. In Force Control Theory and Method of Human Load Carrying Exoskeleton Suit, 131–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54144-9_5.

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Chen, Fengxin, und Huanzhen Chen. „Least-Squares Expanded Mixed Finite Element Method for Incompressible Miscible Displacement Problem in Porous Media“. In Future Computing, Communication, Control and Management, 233–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27326-1_30.

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Yang, Zhiyong, Wenjin Gu, Jing Zhang und Lihua Gui. „Impedance Control of Exoskeleton Suit with Uncertainties“. In Force Control Theory and Method of Human Load Carrying Exoskeleton Suit, 179–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54144-9_7.

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Konferenzberichte zum Thema "Force and displacement control method"

Yoshida, Haruyuki, Masaya Morino, Norihisa Ogawa und Hiroshi Noborio. „A Force/Displacement Transformation Method for Digitalized Virtual Deformable Object“. In 2006 9th International Conference on Control, Automation, Robotics and Vision. IEEE, 2006. http://dx.doi.org/10.1109/icarcv.2006.345453.

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Tsai, C. D., M. S. Ju und Y. G. Tsuei. „Modal Control by Modal Force Technique“. In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0363.

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Abstract Modal control of structure requires the estimation of the modal states variables for feedback. One approach that does not require modal states variables estimation is the direct feedback control. Recent developments in modal control for direct feedback are mainly time domain methods. In this paper, an efficient method based on frequency domain approach named Modal Force Technique is developed. The method not only allows one to modify the global dynamic behavior of the synthesized structure but also can be utilized for modal control problem if the acceleration, velocity and displacement feedbacks are used.

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Cullinan, Michael A., Robert M. Panas, Cody R. Daniel, Joshua B. Gafford und Martin L. Culpepper. „Non-Cleanroom Fabrication of Carbon Nanotube-Based MEMS Force and Displacement Sensors“. In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47945.

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Traditional microelectromechanical MEMS fabrications such photolithography and deep reactive ion etching (DRIE) are expensive and time consuming. This limits the types and designs of MEMS devices that can be produced cost effectively since in order to overcome the high startup costs and times associated with traditional MEMS fabrication techniques tens of thousands of each type of MEMS device must be produced and sold. In this paper, we will present a method for placing carbon nanotube (CNT) based piezoresistive sensors onto metallic flexural elements that are created via micromachining. This method reduces the fabrication time from over 3 months to less than 3 days. In addition, the fabrication cost is reduced form over $500 per device to less than $20 per device. This flexible, low cost fabrication method enables rapid prototyping of MEMS devices which is an important step in the design and development process for electromechanical systems. Also, the development of this type of low cost fabrication method will help to make low volume manufacturing of MEMS devices feasible from a cost prospective. In this fabrication method, a micromill is used to fabricate the flexure beams. Electron beam evaporation is then used to deposit (1) an insulating ceramic thin film layer and (2) metal traces on the flexure. A shadow mask is used to define the wire patterns. Either a tungsten wire or a focused ion beam (FIB) is used to define a 1–5 μm gap in the wire traces. Dielectrophoresis is then used to orient/position the CNT sensors across the gap. Finally, the structure is coated with a thin ceramic layer to protect the sensor and mitigate noise. When the flexure element is deflected, the CNTs strain which results in a measurable change in resistance. Several meso-scale test devices were produced using this fabrication method. The devices that were fabricated using a FIB to create the gap in the wire traces have the same strain sensitivity as devices fabricated using traditional cleanroom based techniques. However, the devices that were fabricated using the tungsten wire have a strain sensitivity that is almost 7 times lower than the devices fabricated using traditional cleanroom based fabrication techniques. This is because the gap size for the tungsten wire fabrication method is about an order of magnitude larger than for the FIB cut or lithography based gap fabrication methods. Therefore, the CNT are not able to stretch across the entire gap. This creates CNT-CNT junctions in the electrical pathway of the sensors which significantly increases the sensor resistance and decreases the strain sensitivity of the sensor. Overall, these results show that functional CNT-based piezoresistive MEMS sensors may be fabricated without conventional integrated circuit (IC) microfabrication technologies but that tight control over the gap size is needed in order to ensure that the sensor performance is not degraded.

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Wu, Jie, Philippe Mainc¸on, Carl M. Larsen und Halvor Lie. „VIV Force Identification Using Classical Optimal Control Algorithm“. In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79568.

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Due to the difficulty of direct force measurements in vortex induced vibration (VIV) experiments with long elastic cylinders, accelerometer and bending strain measurement are available. Still, obtaining information on the force is of great interest to researchers. The work presented in this paper follows the same principle as Mainc¸on (2004), who estimated external forces acting on a riser subjected to VIV from measured response by using a classical optimal tracking algorithm. The objective of this study is to first present a method for extracting VIV forces from measured data with long elastic riser models subjected to current. The second objective is to extract first order (primary) cross-flow force coefficients by a combined use of modal filtering. The algorithm minimizes the sum of the squares of the discrepancies between measured and predicted response plus a constant times the sum of squares of the external forces, while satisfying the system’s dynamic equilibrium equation. FEM discretization of the riser with Euler beam elements leads to a stiffness and mass matrix. The dimension of these matrixes is reduced by eliminating the rotation degree of freedom using master-slave condensation, which greatly facilitates the matrix iteration. Displacement is used in this study as input to the algorithm to identify forces. The method is verified against synthetic measurement data. The results showed the algorithm’s capability to accurately estimate the input forces from noisy measurement data. The method is applied to the data from a rotating rig test to identify hydrodynamic forces in primary cross-flow vortex shedding frequency range. The emphasis is on extracting force coefficient database. One important finding is that the high mode component of the force contributed little to the response, while it resulted in complication of the coefficient data base. Therefore, they are neglected by filtering the measurement with modal analysis before the use of inverse force estimation. The excitation and added mass coefficients are calculated and their contour plots are generated. Comparisons with existing data are investigated.

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Jouppila, V., und A. Ellman. „Multiplexed Force Control of Pneumatic Muscles“. In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13645.

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Pneumatic actuators are often used in applications that require high power-to-weight ratio, combined with low price and clean and fast operation. However, due to the compressibility of air and highly nonlinear behavior of seal friction, the position and force control of these actuators is difficult to manage. As a result, pneumatic cylinders have been used for many years solely in simple repetitive tasks requiring only a very limited amount of system control. Nonetheless, the pneumatic actuators have properties such as compactness, high power-to-weight ratio, and simplicity that are desirable features in advanced robotics. To overcome the shortcomings, a number of advanced pneumatic components have been developed, of which the most promising is the pneumatic muscle. Compared to a cylinder, a pneumatic muscle not only has a higher power-to-weight and power-to-volume ratio but it is also almost frictionless and has zero leakage. In spite of the muscle actuator's nonlinear force-to-contraction characteristics, many motion and force control methods have been successfully applied to it. The characteristics of the actuator enable it to be used in simple positioning systems and as a variable gas spring. The actuator's almost linear pressure-to-force ratio is extremely well-suited to a variety of gripping and pressing applications. Due to the muscle actuator's characteristics and recent developments in pneumatic valve technology, there is an opportunity to share a single pressure control servo valve among multiple muscle actuators. The multiplexed control of the actuators with only one servo valve reduces the system costs significantly. In this paper we investigate the feasibility of employing multiplexed force control of four pneumatic muscle actuators. In the system, pressure is controlled by a single proportional pressure valve. High-speed switching valves are used for activating the pressure control for each muscle actuator in the desired manner. Pneumatic cylinders are attached to the other ends of the muscles in order to cause controllable position disturbances. The displacement, force and pressure of each muscle are measured with appropriate sensors. The system behavior is investigated under position disturbances.

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Li, Qiao, und Motohiko Murai. „Study on a Time Domain Prediction Method for Wave Force: Application for a Point-Absorber WEC“. In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77720.

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There are a lot of numerical analysis for solving hydrodynamic responses of a floating body in the time domain. Most of them can give a theoretical solution in given irregular waves. It means, however, that the solution can be obtained only if the accurate irregular waves represented by the wave spectrum should be given. As we consider the actual operation, we know it is difficult to detect the accurate irregular waves instantaneously as needed accuracy in the most of the time domain analysis for feed backing the control force to the system. This paper proposes a new method to predict the practical wave force from the displacement of waves at a floating body in time domain analysis almost instantaneously. The method, that can apply to predict forces in wave energy converter with linear electric generator, helps us to choose the control force for convert more electric power in irregular waves. We confirm the algorithm and examine its effectiveness.

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Yamaguchi, Hideya, Masahito Yashima und Yoshinori Hirayama. „Vibration Reduction and Isolation by On-Off Control of Friction Force at Spring Support“. In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-3802.

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Abstract This paper presents a new method of on-off control for the spring support to reduce and isolate vibration transmitted to machines or structures. The procedure utilizes the auxiliary spring whose end is designed to control the clamping friction force with the brake mechanism. The clamping friction force is varied according to the switching law that is deduced from the variable structure systems (VSS) control theory taking into account the energy dissipation due to friction. The experiments and numerical simulations confirmed the effectiveness of the proposed method by investigating the transient response and the displacement transmissibility.

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Iwasaki, Akihisa, Kazuo Hirota, Masatsugu Monde, Shinichiro Matsubara und Iwao Ikarimoto. „Development of a Core Seismic Analysis Method for a Fast Reactor“. In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63454.

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A fast reactor core consists of several hundreds of core assemblies, which are hexagonal flexible beams embedded at the lower support plate in a hexagonal arrangement, separated by small gaps, and immersed in a fluid. Core assemblies have no support for vertical fixing in order to avoid the influence of thermal expansion and swelling. These days, in Japan, it has become necessary to postulate huge earthquakes in seismic evaluations. If a great earthquake occurs, the large displacement and impact force in each core assembly may cause problems with control rod insertability and core assembly strength. So, it is necessary to grasp the vibration behavior of the core elements during an earthquake in order to appropriately design the core support structures and core elements of a fast reactor. Thus, considering horizontal and vertical forces (impact forces and fluid forces) acting on the core elements during an earthquake, a core seismic analysis method has been developed to evaluate 3D core vibration behavior considering fluid structure interaction and vertical displacements (rising). This paper summarizes the details of the core element vibration analysis code in 3D (REVIAN-3D) that has been developed.

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Hennessy, R. P., G. G. Adams und N. E. McGruer. „A Finite Element Method Approach to Modeling a Thermal-Electrical-Mechanical Coupled Field Contact“. In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61156.

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This paper presents a finite element method approach for modeling a thermal-electrical-mechanical coupled-field contact comprised of an elastic hemisphere and an elastic half space. The goal of this model is to develop a fundamental understanding of the behavior of a multi-physics contact with a particular interest in the contact area. The results from the model illustrate a clear difference in contact behavior between force control and displacement control in the presence of an applied electrical potential. It is shown that, while Hertzian contact theory can be used to accurately predict the behavior of the contact under force control, a new relationship must be established to accurately predict the behavior of the contact under displacement control. This relationship can be applied to RF MEMS switch contact bumps as well as macro scale electrical contacts.

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Zhang, Shuai, Tianyun Li, Xiang Zhu und Wenjie Guo. „Analysis of Acoustic Radiation Characteristics of an Infinitely Long Half-Filled Cylindrical Shell“. In ASME 2018 Noise Control and Acoustics Division Session presented at INTERNOISE 2018. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ncad2018-6139.

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The acoustic radiation analysis of a fully-submerged infinitely long half-filled cylindrical shell coupling with fluid field is a typical acoustic-structure problem in the infinite domain, the solution of which is currently mainly based on numerical method. The analytic or semi-analytical method is indispensable for the numerical method and the mechanism to reveal the acoustic-structure coupling characteristics. In this paper, an analytic solution is presented that can calculate the acoustic radiation of infinitely long half-filled cylindrical shell. The displacement of the shell, the fluid load and the excitation force are expressed as the combination of trigonometric series and Fourier series, and displacements of the other two directions are removed by orthogonalizing, only the radial displacement is retained. The control equation of the fluid-structure interaction can be obtained from the relationship between the amplitude of fluid load and the amplitude of radial displacement which can be established by orthogonalizing the continuous conditions of the fluid-structure coupled contact surface and the free surface boundary condition. Solving the control equation, the vibration and acoustic radiation of the coupling system can be determined. Compared with the finite element software Comsol, the results of forced vibration and underwater radiated noise show that the presented method is accurate and reliable. A new way to solve acoustic-vibration problem with partial coupling of elastic structure and sound field is provided in this study.

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Berichte der Organisationen zum Thema "Force and displacement control method"

McGilvra, Troy. Variation in Quarters Dispositions A Force Protection and Readiness Issue Explanations and Control Method. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada420815.

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Roberts, R. G., C. A. Moore, S. Tosunoglu und D. W. Repperger. Wave Variable Method to Control Force-Reflecting Teleoperators With Time Delays: Generalizing the Wave Variable Method to Multiple Degree-of-Freedom Systems. Fort Belvoir, VA: Defense Technical Information Center, März 2005. http://dx.doi.org/10.21236/ada433539.

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Unseren, M. A. A review of a method for dynamic load distribution, dynamic modeling, and explicit internal force control when two serial link manipulators mutually lift and transport a rigid body object. Office of Scientific and Technical Information (OSTI), September 1997. http://dx.doi.org/10.2172/631259.

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CAPACITY EVALUATION OF EIGHT BOLT EXTENDED ENDPLATE MOMENT CONNECTIONS SUBJECTED TO COLUMN REMOVAL SCENARIO. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.6.

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The extended stiffened endplate (8ES) connection is broadly used in the seismic load-resisting parts of steel structures. This connection is prequalified based on the AISC 358 standard, especially for seismic regions. To study this connection’s behaviors, in the event of accidental loss of a column, the finite element model results were verified against the available experimental data. A parametric study using the finite element method was then carried out to investigate these numerical models’ maximum capacity and effective parameters' effect on their maximum capacity in a column loss scenario. This parametric analysis demonstrated that these connections fail at the large displacement due to the catenary action mode at the rib stiffener's vicinity. The carrying capacity, PEEQ, Von-Mises stress, middle column force-displacement, critical bolt axial load, and the beam axial load curves were discussed. Finally, using the Least Square Method (LSM), a formula is presented to determine the displacement at the maximum capacity of these connections. This formula can be used in this study's presented method to determine the maximum load capacity of the 8ES connections in a column loss scenario.

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