Letteratura scientifica selezionata sul tema "Shock absorber (damper)"
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Articoli di riviste sul tema "Shock absorber (damper)"
1
Liu, Xiao Chuan, Shi Xing Zhu e Yong Gang Yang. "Design and Drop Test of Aircraft Landing Gear’s Shock Absorber Based on Magnetorheological Damper". Applied Mechanics and Materials 665 (ottobre 2014): 601–6. http://dx.doi.org/10.4028/www.scientific.net/amm.665.601.
Testo completoAbstract (sommario):
The structure of a shock absorber based on magnetorheological (MR) damper with a metering pin is proposed, and structure of the magnetic circuit of MR damper is optimized. By drop tests, the damping characteristics of the shock absorber and damping effect are tested. The experimental results show that the shock absorber has the characteristic of a wide damping force adjustment range and lower energy dissipation. The maximum vertical load and shock absorber piston displacement can be changed at same drop height by changing the current. It has also been proved that shock absorber based on MR damper is better than conventional oleo-pneumatic shock absorber on adjustment of damping force.
2
Faraj, Rami, Cezary Graczykowski e Jan Holnicki-Szulc. "Adaptable pneumatic shock absorber". Journal of Vibration and Control 25, n. 3 (27 agosto 2018): 711–21. http://dx.doi.org/10.1177/1077546318795532.
Testo completoAbstract (sommario):
Recent progress in the field of sensors, actuators, and smart materials allows the construction of more and more efficient controllable pneumatic dampers for shock absorption. Typically, such devices apply online semi-active control techniques, which utilize electromagnetic, piezoelectric, or magnetostrictive valves. As a result, they are characterized by a high efficiency of impact absorption, but simultaneously by a complicated construction and a specialized electronic system. The alternative solutions are semi-passive absorbers that ensure a similar performance by using a much simpler, low-cost construction and a less complicated adaptation mechanism. This paper introduces an adaptable semi-passive single-chamber pneumatic shock absorber, SOFT-DROP, which provides the optimal impact absorption and energy dissipation after a single reconfiguration performed at the beginning of the process. The high effectiveness of the proposed concept is proved in numerical and experimental investigations of the device. Moreover, the proposed semi-passive damper is also compared against already known pneumatic absorbers that utilize semi-active control methods. Ultimately, the device might be used in an airdrop system for delivery of light packages.
3
Sikora, Marian. "Modeling and Operational Analysis of an Automotive Shock Absorber with a Tuned Mass Damper". Acta Mechanica et Automatica 12, n. 3 (1 settembre 2018): 243–51. http://dx.doi.org/10.2478/ama-2018-0038.
Testo completoAbstract (sommario):
Abstract Recently, the topic of energy dissipation efficiency of vehicle suspension dampers has become a research and engineering problem due to structural requirements of vehicle manufacturers and the introduction of electric/hybrid cars. By principle, any disturbances in the damping force generation process translate into pressure fluctuations to be then transferred to the body of the vehicle. The effect known as rattling within the damper engineering community is perceived as detrimental to ride comfort. To improve the performance of a vehicle damper several methods can be devised and used. One approach is to optimize the settings of the valves in the damper. The approach, however, often influences the force output of the damper. Another technique involves the application of add-on systems. One such system is the tuned mass damper concept originally developed by Frahm for structural engineering applications. In the paper the author proposes a damper concept equipped with an external/internal tuned mass damper component for improving the dynamic characteristics of vehicle dampers. The author presents modeling details followed by simulations of the damper with the tuned mass damper concept subjected to oscillatory inputs, and a critical analysis of the presented results.
4
Luo, Feng, e Xiao Li Zhang. "A Review of Aeration and Cavitation Phenomena in the Hydraulic Shock Absorber". Applied Mechanics and Materials 536-537 (aprile 2014): 1369–73. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1369.
Testo completoAbstract (sommario):
This paper aims to bring an organized overview of the damper malfunction due to the cavitation and aeration phenomena, which are normal problems for all kinds of hydraulic dampers. The object of this report is to describe, detect and simulate these damper failures.
5
Rahman, M. A., U. Ahmed e M. S. Uddin. "Response of Non-Linear Shock Absorbers-Boundary Value Problem Analysis". International Journal of Applied Mechanics and Engineering 18, n. 3 (1 agosto 2013): 793–814. http://dx.doi.org/10.2478/ijame-2013-0048.
Testo completoAbstract (sommario):
Abstract A nonlinear boundary value problem of two degrees-of-freedom (DOF) untuned vibration damper systems using nonlinear springs and dampers has been numerically studied. As far as untuned damper is concerned, sixteen different combinations of linear and nonlinear springs and dampers have been comprehensively analyzed taking into account transient terms. For different cases, a comparative study is made for response versus time for different spring and damper types at three important frequency ratios: one at r = 1, one at r > 1 and one at r <1. The response of the system is changed because of the spring and damper nonlinearities; the change is different for different cases. Accordingly, an initially stable absorber may become unstable with time and vice versa. The analysis also shows that higher nonlinearity terms make the system more unstable. Numerical simulation includes transient vibrations. Although problems are much more complicated compared to those for a tuned absorber, a comparison of the results generated by the present numerical scheme with the exact one shows quite a reasonable agreement
6
Yip, Chun-Chieh, Jing-Ying Wong, Su-Shen Lim e Jie-Sheng Ooi. "Pseudo dynamic loads energy dissipation in mechanical shock absorber seismic damper". E3S Web of Conferences 347 (2022): 03012. http://dx.doi.org/10.1051/e3sconf/202234703012.
Testo completoAbstract (sommario):
Earthquake tremor from neighbouring country had caused several cases of structural and non-structural damages toward the buildings in Malaysia. This issue had raised public attention about the safeness of the low-rise, mid-rise and high-rise building in the country. Buildings without proper seismic resistance design will collapse during the earth earthquake and people who could not evacuated from the building will be buried alive. Viscous Damper is one of the passive structural control systems in attenuating the seismic response on building. The damper utilized principle of fluid flow through orifices to create friction that turns the movement into heat energy to be release into atmosphere. This study is to investigate the effectiveness and behaviour of the mechanical shock absorber as damper in resisting seismic force. Three different type of dampers are being tested under 6 different loading displacement amplitude to measure the hysteresis loops and energy dissipation capability. The results showed that the extra features of the coil over in EX5 Kriss Wave damper with 17 kNmm had significantly increase the energy dissipation capability up to 5.6 time better than the lowest 3 kNmm APIDO type damper.
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Abdo, Tamer M., Ahmed A. Huzayyin, Ahmed A. Abdallah e Amr A. Adly. "Characteristics and Analysis of an Eddy Current Shock Absorber Damper Using Finite Element Analysis". Actuators 8, n. 4 (19 novembre 2019): 77. http://dx.doi.org/10.3390/act8040077.
Testo completoAbstract (sommario):
In the paper a model is developed for a proposed eddy current damper using finite element analysis. Several damper configurations are studied and its characteristics are analyzed. The steady state performance for the configurations is compared to reach a design with an acceptable performance for the eddy current damper. Furthermore, the proposed designs performance are compared with the traditional damper performance. It was found that the best two designs to achieve the targeted performance were to have an iron core damper or an iron core with an aluminum sleeve. Those two designs are economical and simple while achieving acceptable performance when compared to traditional dampers and other electromagnetic damping systems.
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Wszołek, Grzegorz, Piotr Czop, Dawid Jakubowski e Damian Slawik. "Optimization of a Shock Absorber Design Using Model-Based Approach". Advanced Materials Research 452-453 (gennaio 2012): 1351–55. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.1351.
Testo completoAbstract (sommario):
The aim of this paper is to demonstrate a possibility to optimize a shock absorber design to minimize level of vibrations with the use of model-based approach. The paper introduces a proposal of an optimization method that allows to choose the optimal values of the design parameters using a shock absorber model to minimize the level of vibrations. A model-based approach is considered to obtain the optimal pressure-flow characteristic by simulations conducted with the use of coupled models, including the damper and the servo-hydraulic tester model. The presence of the tester model is required due to high non-linear coupling of the tested object (damper) and the tester itself to be used for noise evaluation. This kind of evaluation is used in the automotive industry to investigate dampers, as an alternative to vehicle-level tests. The paper provides numerical experimental case studies to show application scope of the proposed method
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Guntur, Harus Laksana, e Wiwiek Hendrowati. "A Comparative Study of the Damping Force and Energy Absorbtion Capacity of Regenerative and Conventional-Viscous Shock Absorber of Vehicle Suspension". Applied Mechanics and Materials 758 (aprile 2015): 45–50. http://dx.doi.org/10.4028/www.scientific.net/amm.758.45.
Testo completoAbstract (sommario):
This paper presents a comparative study of the damping force and energy absorbtion capacity of a typical conventional-viscous and a regenerative shock absorber for vehicle suspension. Regenerative shock absorber (RSA) is a shock absorber which can regenerate the dissipated vibration energy from vehicle suspension into electricity. In this research, a prototype of regenerative shock absorber was developed, its damping force and energy absorbtion capacity were tested, and the results were analized and compared with those of a typical conventional-viscous shock absorber. The regenerative and viscous shock absorber were compressed and extended in various excitation frequency using damping force testing equipment to obtain force-velocity and the force-displacement curves. The force-velocity and force-displacement curves indicate the damping force and energy absorbtion capacity of the shock absorber. The results show that the damping force of the typical-viscous shock absorber closed to linear at all exciation frequencies. For regenerative shock absorber, nonlinearity and large hysteresis area of the damping force occur at all excitation frequencies. Further, the energy absorbtion capacity of the typical-viscous shock absorber shows an elliptical area with the compression part bigger than the extension one, while those of the regenerative shock absorber shows an asymmetric square area, which indicates a smaller energy absorbtion capacity. These phenomena indicate the significant effect of implementing dry friction damper and elctrical damper to the characteristics of regenerative shock absorber.
10
Audenino, A. L., e G. Belingardi. "Modelling the Dynamic Behaviour of A Motorcycle Damper". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 209, n. 4 (ottobre 1995): 249–62. http://dx.doi.org/10.1243/pime_proc_1995_209_212_02.
Testo completoAbstract (sommario):
Within the context of vehicle suspension component characterization, that of shock absorbers is one of the more difficult to achieve, yet it is a very critical factor in the prediction of vehicle dynamic behaviour. Strongly non-linear output force functions are always linked to a frequency-dependent behaviour. Using the internal fluid-dynamic phenomenon with respect to a motorcycle shock absorber, different physical models of increasing complexity are presented: using these models it is possible to evaluate the importance of different factors, for example oil compressibility or oil inertia. Comparisons with experimental data confirm the validity of these models
Tesi sul tema "Shock absorber (damper)"
1
Svennerbrandt, Per. "Force Feedback Control of a Semi-Active Shock Absorber". Thesis, Linköpings universitet, Reglerteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-117923.
Testo completoAbstract (sommario):
Semi-active suspension systems promise to significantly reduce the necessary trade-off be-tween handling and passenger comfort present in conventional suspension systems by enabling active chassis and wheel control. Öhlins Racing AB have developed a semi-active suspension technology known as CES, Continuously controlled Electronic Suspension, based on solenoid control valves which are integrated into specially designed hydraulic dampers, and are currently developing control and estimation systems which will enable their application in advanced motorcycle suspensions. In these systems an important aspect is being able to accurately control the forces produced. Öhlins’ current system uses an open loop control strategy in which currents sent through the solenoid valves, to achieve the requested damping force under the prevailing circumstances, is calculated using experimentally derived static lookup tables. In this thesis a new closed loop control system, based on the direct measurement of the damper force, is developed and its performance is evaluated in comparison to the old one’s. Sufficient understanding of the system requires extensive modeling and therefore two different models have been developed; a simpler one used for model based control design and a more extensive, high fidelity model used for high accuracy simulations. The developed simulation model is the first of its kind that is able to capture the studied systems behavior with satisfactory accuracy, as demonstrated against real dynamometer measurements. The valves and damper behave in a highly non linear manner and the final controller design uses a combination of exact linearization, non linear state estimation, dynamical inversion and classical control theory. Simulation results indicate that the new controller reduces the root mean square force tracking error to about 63% of that of the existing controller in the evaluation scenarios used. Cascaded within the system is also closed loop current controllers. A developed model based controller is shown to reduce the rise time to less than 30% of that of the existing PID-controllers, reduce the overshoot and provide online estimates of the winding series resistance, providing the basis for future solenoid diagnosis and temperature tracking systems.
2
Rhoades, Kirk Shawn. "Development and experimental verification of a parametric model of an automotive damper". Texas A&M University, 2006. http://hdl.handle.net/1969.1/4156.
Testo completoAbstract (sommario):
This thesis describes the implementation of a parametric model of an automotive
damper. The goal of this research was to create a damper model to predict accurately
damping forces to be used as a design tool for the Formula SAE racecar team. This
study pertains to monotube gas charged dampers appropriate to Formula SAE racecar
applications.
The model accounts for each individual flow path in the damper, and employs a
flow resistance model for each flow path. The deflection of the shim stack was
calculated from a force balance and linked to the flow resistance. These equations yield
a system of nonlinear equations that was solved using Newton's iterative method.
The goal of this model was to create accurately force vs. velocity and force vs.
displacement plots for examination. A shock dynamometer was used to correlate the
model to real damper data for verification of accuracy. With a working model,
components including the bleed orifice, piston orifice, and compression and rebound
shims which were varied to gain an understanding of effects on the damping force.
3
Richards, Russell Joseph. "Comparison of Linear, Nonlinear, Hysteretic, and Probabilistic MR Damper Models". Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31447.
Testo completoAbstract (sommario):
Magnetorheolgical (MR) fluid dampers have the capability of changing their effective damping force depending on the current input to the damper. A number of factors in the construction of the damper, as well as the properties of the fluid and the electromagnet, create a dynamic response of the damper that cannot be fully described with a static model dependent on current and velocity. This study will compare different techniques for modeling the force response of the damper in the current-velocity space.
To ensure that all the dynamic response characteristics of the damper are captured in data collection, random input signals were used for velocity and current inputs. By providing a normally distributed random signal for velocity to a shock dynamometer and a uniformly distributed random signal for current to a Lord rheonetic seat damper, the force response could be measured.
The data from this test is analyzed as a two dimensional signal, a three dimensional force plot in the current velocity plane, and as a probability density function. Four models are created to fit the data. The first is a linear model dependent solely on current. The second is a nonlinear model dependent on both current and velocity. The third model takes the nonlinear model and includes a filter that affects the force response of the model with time. Each of these three approaches are compared based on the total error in the force response and the models? ability to match the PDF of the data. Finally, a fourth model is created for the damper that improves the nonlinear model by making one parameter a probability parameter defined by a PDF calculated from the data. However, because it is a probability model, the error cannot be found through comparison to the data.Master of Science
4
Gravatt, John Wilie. "Magneto-Rheological Dampers for Super-sport Motorcycle Applications". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/33022.
Testo completoAbstract (sommario):
In recent years, a flurry of interest has been shown for a relatively old technology called magneto-rheological fluids, or MR fluids. Multiple types of devices have been designed to implement this versatile fluid, including linear dampers, clutches, work-piece fixtures, and polishing machines. The devices have been used in automobiles, washing machines, bicycles, prosthetic limbs, and even smart structures.
This thesis focuses on another application of MR dampers, involving super-sport motorcycles. This paper introduces the topics of MR dampers and motorcycle suspensions, and why the two would be a good combination. A detailed history of MR fluids, MR dampers, and motorcycle suspension technologies is given next.
After a broad outline of MR dampers and motorcycle suspensions, the method of designing and manufacturing MR dampers is discussed. The damper design for this research is presented in detail, along with the design procedure used to make it.
Next, laboratory testing for it is covered, including the test equipment, test procedure, and the laboratory test results. Upon laboratory test completion, the field test setup and procedure are presented. The results of field tests with stock dampers and MR dampers with a variety of control systems is discussed.
The MR dampers provided a more stable ride than that of the OEM dampers. By reducing suspension displacement, settling time, and suspension oscillations, the MR dampers were able to reduce suspension geometry instability.
Lastly, concluding remarks are made on the research presented. Design flaws are discussed, as well as recommendations for future work in the same area.Master of Science
5
Norris, James Alexander. "Behavior of Magneto-Rheological Fluids Subject to Impact and Shock Loading". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/33865.
Testo completoAbstract (sommario):
Investigations on the design of controllable magnetorheological (MR) fluid devices have focused heavily on low velocity and low frequency applications. The extensive work in this area has led to a good understanding of MR fluid properties at low velocities and frequencies. However, the issues concerning MR fluid behavior in impact and shock applications are relatively unknown.
To investigate MR fluid properties in this regime, MR dampers were subjected to impulsive loads. A drop-tower test facility was developed to simulate the impact events. The design includes a guided drop-mass released from variable heights to achieve different impact energies. Five drop-heights and two fundamental MR damper configurations were tested. The two configurations were a double-ended piston and a mono-tube with nitrogen accumulator. To separate the dynamics of the MR fluid from the dynamics of the current source, each damper received a constant supply current before the impact event. A total of five supply currents were investigated for each impact velocity.
After reviewing the results, it was concluded that the effect of energizing the MR fluid only leads to â controllabilityâ below a certain fluid velocity for the double-ended design. In other words, until the fluid velocity dropped below some threshold, the MR fluid behaved as if it was not energized, regardless of the strength of the magnetic field. Controllability was defined when greater supply currents yielded larger damping forces.
For the mono-tube design, it was shown that the MR fluid was unable to travel through the gap fast enough during the initial impact. Consequently, the damper piston and accumulator piston traveled in unison until the accumulator bottomed out. After which, the fluid was forced through the gap.
In conclusion, the two designs were compared and general recommendations on designing MR dampers for impulsive loading were made. Possible directions for future research were presented as well.Master of Science
6
Boggs, Christopher Matthew. "The Use of Simulation to Expedite Experimental Investigations of the Effect of High-Performance Shock Absorbers". Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/26108.
Testo completoAbstract (sommario):
Successful race teams rely heavily on track testing to search for the ideal suspension setup. As more restrictions are placed on the amount of on-track testing by major racing sanctioning bodies, such as NASCAR, teams have increased their attention to alternate testing methods to augment their track data and better understand the dynamics of their racecars. One popular alternate to track testing is 8-post dynamic shaker rig testing. Eight-post rig testing gives the team a better understanding of the vehicle's dynamics before they arrive at the race track, allowing them to use their limited track testing time more efficiently.
While 8-post rig testing certainly is an attractive option, an extensive test matrix is often required to find the best suspension setups. To take full advantage of 8-post rig tests, more efficient experimental methods are needed. Since investigating shock absorber selection is often the most time-consuming task, this study focuses on developing more efficient methods to select the best shock absorber setups.
This study develops a novel method that applies dynamic substructuring and system identification to generate a mathematical model that predicts the results of future tests as both command inputs and components are changed. This method is used to predict the results of 8-post rig tests as actuator commands and shock absorber forces are varied. The resulting model can then be coupled with shock absorber models to simulate how the vehicle response changes with shock absorber selection. This model can then be applied to experimental design.
First, a physically-motivated nonlinear dynamic shock absorber model is developed, suitable for quickly fitting experimental data and implementing in simulation studies. Next, a system identification method to identify a vehicle model using experimental data is developed. The vehicle model is then used to predict response trends as shock absorber selection is varied. Comparison of simulation and experimental results show that this model can be used to predict the response levels for 8-post rig tests and aid in streamlining 8-post rig testing experimental designs.Ph. D.
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Карпов, Андрій Сергійович. "Удосконалення ендопротезу колінного суглобу за рахунок використання магнітно-реологічного демпфера". Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/23062.
Testo completoAbstract (sommario):
Магістерська дисертація на тему “Удосконалення ендопротезу колінного суглобу за рахунок використання магнітно-реологічного демпфера”, складається з __3__ розділів, обсяг пояснювальної записки __117__ сторінок основного тексту, включає _75__ рисунків і _31__ таблиця, та __8__ плакатів графічного матеріалу.
Метою роботи є підвищення стабільності МРД протезу колінного суглобу в змінних умовах експлуатації.
Для досягнення поставленої мети було сформульовано ряд задач:
- провести аналіз існуючих конструкцій протезів колінних суглобів;
- теоретично обґрунтувати та створити математичні моделі робочих процесів та дослідити вплив температури та напруженості магнітно поля на робочі характеристики МРД;
- розробити експериментальну установку для перевірки та уточнення математичних моделей МРД;
- провести експериментальні дослідження;
- розробити рекомендації щодо створення адаптивних демпферів з урахуванням результатів отриманих при виконанні роботи.
Перший розділ даної роботи присвячено аналітичному дослідженню впливу зовнішніх та внутрішніх факторів на демпфери протезу та методи адаптації під них.
Другий розділ присвячено розробці математичної моделі яка описує залежність впливу температури на робочу характеристику демпфера.
Третій розділ включає в себе створення стенду для проведення відповідних експериментальних досліджень, представлена схема та необхідна апаратура, що дозволили створити безпосередньо стенд для досліджень впливу температури та тиску робочого середовища на робочі характеристики МРД суглобу. Розробити методи експериментальних досліджень. Проведено серії експериментів, для визначення впливу перепаду тиску та температури на робочу характеристику.
Об’єктом дослідження в даній роботі є процес функціонування МРД протезу колінного суглобу, а саме його дроселя при різних умовах експлуатації.
Предметом дослідження є зв'язок конструктивних параметрів провідності регульованого дроселя та зміни температури робочої рідини.
Науковою новизною даного дослідження є запропоновані аналітичні залежності, що відображають зміну витрати від прикладеної сили струму (магнітного поля). Розроблена уточнена математична модель процесу демпфування протезу колінного суглобу.
Перелік ключових слів:
Демпфер, протезування, моделювання в SolidWorks, адаптивні властивості, дросель.
Для дослідження МРД використовувався пакет прикладних програм „MatLab ”, в додатку до нього „Simulink”.
Результати дослідження дозволяють вдосконалити конструкцію МР демпфера та зменшити температурний фактор на його характеристики.
Публікаціїї. За матеріалами магістерської дисертації було опубліковано 4 праці, а саме 3 тези доповідей на міжнародних науково-технічних конференціях студентів.The master's thesis on the theme "Improvement of knee joint endoprosthesis due to the use of magnetic-rheological damper" consists of __3__ sections, the volume of the explanatory note __117__ pages of the main text, includes _75__ drawings and _31__ tables, and __8__ posters of graphic material. The aim of the work is to increase the stability of the MRI of the knee joint prosthesis under varying operating conditions. To achieve this goal, a number of tasks were formulated: - to carry out an analysis of existing designs of knee joints; - theoretically substantiate and create mathematical models of work processes and investigate the influence of temperature and intensity of the magnetic field on the operating characteristics of the MRD; - to develop an experimental installation for checking and refinement of mathematical models of MRD; - to conduct experimental research; - to develop recommendations for the creation of adaptive damping taking into account the results obtained during the work. The first section of this paper is devoted to the analytical study of the influence of external and internal factors on the denture dampers and the methods of adaptation under them. The second section is devoted to the development of a mathematical model that describes the dependence of temperature influence on the performance of the damper. The third section includes the creation of a stand for conducting relevant experimental research, a diagram and the necessary equipment are presented, which allowed to create a stand directly for research on the influence of temperature and pressure of the working environment on the working characteristics of the MRD of the joint. Develop experimental research methods. A series of experiments was conducted to determine the effect of pressure drop and temperature on the performance. The object of the research in this paper is the process of functioning of the MRI of the knee joint prosthesis, namely, its chokes under different operating conditions. The subject of the study is the connection of the design parameters of the conductivity of the regulated choke and changes in the temperature of the working fluid. The scientific novelty of this study is the proposed analytical dependence, reflecting the change in flow rate from the applied current strength (magnetic field). The refined mathematical model of the process of damping the knee joint prosthesis is developed. Keyword list: Damper, Prosthesis, Modeling in SolidWorks, Adaptive Properties, Choke. To study MRD, a package of applications "MatLab", in addition to "Simulink" was used. The results of the study allow to improve the design of the MP damper and reduce the temperature factor on its characteristics. Publications On the materials of the master's thesis 4 papers were published, namely 3 theses of reports at international scientific and technical conferences of students.
Магистерская диссертация на тему "Совершенствование эндопротеза коленного сустава за счет использования магнитно-реологического демпфера", состоит из __3__ разделов, объем пояснительной записки __121__ страниц у основного текста, включает _75__ рисунков и _31__ таблиц, и __8__ плакатов графического материала. Целью работы является повышение стабильности МРД протеза коленного сустава в изменяющихся условиях эксплуатации. Для достижения поставленной цели был сформулирован ряд задач: - провести анализ существующих конструкций протезов коленных суставов - теоретически обосновать и создать математические модели рабочих процессов и исследовать влияние температуры и напряженности магнитного поля на рабочие характеристики МРД; - разработать экспериментальную установку для проверки и уточнения математических моделей МРД; - провести экспериментальные исследования; - разработать рекомендации по созданию адаптивных демпферов с учетом результатов полученных при выполнении работы. Первый раздел данной работы посвящен аналитическому исследованию влияния внешних и внутренних факторов на демпферы протеза и методы адаптации в них. Вторая глава посвящена разработке математической модели описывающей зависимость влияния температуры на рабочую характеристику демпфера. Третий раздел включает в себя создание стенда для проведения соответствующих экспериментальных исследований, представлена схема и необходимая аппаратура, позволившие создать непосредственно стенд для исследований влияния температуры и давления рабочей среды на рабочие характеристики М РД сустава. Разработаны методы экспериментальных исследований. Проведено серии экспериментов, для определения влияния перепада давления и температуры на рабочую характеристику. Объектом исследования в данной работе является процесс функционирования МРД протеза коленного сустава, а именно его дросселя при различных условиях эксплуатации. Предметом исследования является связь конструктивных параметров проводимости регулируемого дросселя и изменения температуры рабочей жидкости. Научной новизной данного исследования предложенные аналитические зависимости, отражающие изменение расхода от приложенной силы тока (магнитного поля). Разработана уточненная математическая модель процесса демпфирования протеза коленного сустава. Перечень ключевых слов: Демпфер, протезирование, моделирование в SolidWorks, адаптивные свойства, дроссель. Для исследования МРД использовался пакет прикладных программ "MatLab", в приложении к нему "Simulink». Результаты исследования позволяют усовершенствовать конструкцию МР демпфера и уменьшить температурный фактор на его характеристики. Публикации. По материалам магистерской диссертации было опубликовано 4 работы, а именно 3 тезис а докладов на международных научно - технических конференциях студентов.
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Lazar, Jaroslav. "Magnetoreologický tlumič kmitání". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229399.
Testo completoAbstract (sommario):
This master's thesis deals with an engineering design of an external reservoir for hydraulic shock absorbers with combined filling of oil and magnetorheological fluid. The first part describes existing designes of magnetorheological shock absorbers and characteristics of magnetorheological fluid. Next part describes a design of an experimental external reservoir and a test of its functionality on a prototype. This is followed by an optimalized engineering design of the experimental external reservoir.
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Dlápal, Václav. "Magnetoreologický tlumič pro formuli Student". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400424.
Testo completoAbstract (sommario):
The master thesis deals with design, manufacturing and testing of a prototype magnetorheological damper developed for Formula Student vehicle. The aim was to design and test the damper with similar damping properties to the vehicle as a conventional damper has. Target force-velocity curves were set using quarter car model and evaluated comparing minimal contact force of a tyre for conventional and newly developed damper characteristics. Structural analysis of designed parts, hydraulic and static magnetic analysis were performed. Manufacturing of a specific part magnetorheological damper part was described – piston. Manufactured prototype damper characteristics were evaluated.
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Gelotte, Erik. "Development of software that can predict damper curves on shock absorbers". Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-202657.
Testo completoAbstract (sommario):
This thesis features the development of a software program with a plot function (a setting bank) for data curves, obtained when car dampers are tested in a dynamometer, which measures forces at given velocities. Advanced dampers have many different adjusting possibilities and it was desired to collect data about this for a number of damper types, in a software program that can be used to predict damper curves without having to perform actual tests. The goal was to make it easier for customers (mostly consisting of competitions teams) to test and evaluate different settings to a chosen damper in a fast and simple way, without having to use expensive testing equipment that also is a big time consumer. The project was performed at Öhlins USA Inc. in Hendersonville, North Carolina. It is a subsidiary to Öhlins Racing AB, that manufactures performance shock absorbers for cars, motorcycles, snowmobiles and ATVs for both competition and commercial use. The project was initiated by evaluating and deciding different measuring methods, to see what equipment would be used and how the data collection would be performed. A literature study was also performed to get a better understanding about dampers and their functioning and anatomy. Work began by collecting empirical data at different velocities for a number of different settings, with a dynamometer. Because of the number of possible settings and the time elapse when collecting data, all settings were not actually collected. Most of them were instead calculated mathematically from the collected data. This resulted in data consisting of forces and velocities for a great number of damper settings. Both internal (when hardware in the damper is changed) and external (when changes are made to the hardware). When the data collection and the calculations were done, the software program itself was created with Microsoft Excel and Microsoft Visual Basic. The software lets the user select a damper type and its settings and then plot a graph that corresponds to the damper curve that would be obtained in a real testing rig. The results of the project was a working setting bank that can plot damper curves for a number of Öhlins damper models, by using the collected and calculated data. To increase the accuracy of the curves towards reference data, future studies might need to be performed which uses even better mathematical models and considers flow resistance in the damper.
Libri sul tema "Shock absorber (damper)"
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Sonnenburg, Reinhard, e Anja Stretz. Dynamics of Hydraulic Damper Modules. Nova Science Publishers, Incorporated, 2014.
Cerca il testo completoCapitoli di libri sul tema "Shock absorber (damper)"
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Gołdasz, Janusz, e Bogdan Sapiński. "Damper Modelling". In Insight into Magnetorheological Shock Absorbers, 93–115. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13233-4_5.
Testo completo
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Pütz, Ralph, e Ton Serné. "Schwingungsdämpfer Dampers/Shock Absorbers". In Rennwagentechnik - Praxislehrgang Fahrdynamik, 93–126. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-26704-9_4.
Testo completo
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Pütz, Ralph, e Ton Serné. "Schwingungsdämpfer Dampers/Shock Absorbers". In Rennwagentechnik - Praxislehrgang Fahrdynamik, 81–103. Wiesbaden: Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-16102-6_4.
Testo completo
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Gołdasz, Janusz, e Bogdan Sapiński. "Configurations of MR Dampers". In Insight into Magnetorheological Shock Absorbers, 25–49. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13233-4_3.
Testo completo
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Gołdasz, Janusz, e Bogdan Sapiński. "Energy Harvesting MR Dampers". In Insight into Magnetorheological Shock Absorbers, 173–201. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13233-4_9.
Testo completo
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Gołdasz, Janusz, e Bogdan Sapiński. "Power Drivers for MR Dampers". In Insight into Magnetorheological Shock Absorbers, 131–44. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13233-4_7.
Testo completo
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Gołdasz, Janusz, e Bogdan Sapiński. "Experimental Verification of an MR Monotube Damper Model". In Insight into Magnetorheological Shock Absorbers, 145–71. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13233-4_8.
Testo completo
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Bhuyan, Dheeman. "Designing of a Twin Tube Shock Absorber". In Design and Optimization of Mechanical Engineering Products, 83–104. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3401-3.ch005.
Testo completoAbstract (sommario):
Reverse engineering has become the one of the most relevant concepts in modern design doctrines. Advances in technology demand shorter lead time in the overall product development stage, especially in the automobile sector. Hence as a study in reverse engineering, the author has reverse engineered a twin tube shock absorber. The process involved the obtaining of subassemblies of the damper mechanism to generate a 3D CAD model of the damper in PTC CREO 2.0. The model was used to conduct static structural and CFD analysis of the same using ANSYS 15.0 Workbench. The data obtained was used as the datum for the design modifications and performance enhancement of the part. It was seen that the design of the piston valve was optimum hence modifications to the base valve were done. Following the generation of the datum, similar analyses were conducted on the modified assemblies. The results were compared to the datum for the selection of the most appropriate design. Four designs are analyzed and compared with the datum and the set with four orifices in the valve disk was found to be optimum.
Atti di convegni sul tema "Shock absorber (damper)"
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Mao, Yen-Chieh, e Wei-Chih Chang. "Dynamic Modeling and Fluid-Structure Interactive Analysis of an Innovative Self-Tuning Shock Absorber for the Prosthesis Knee Joint". In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38669.
Testo completoAbstract (sommario):
The above-knee prosthesis, as a supplement of the lost biological leg, is supposed to provide equivalent or enhanced shock absorption capability and reduce the shock waves on the amputee body when walking and running. Prosthesis knee joint with a shock absorber is a feasible solution that efficiently absorbs the impact loads during each heel-strike. Conventional shock absorbers consist of springs and dampers with constant coefficients produce excessive rigid reactions when encountering impact forces, while unreasonable weak responses for gentle loads. This study proposes an innovative viscous damper design for the prosthesis knee joint which automatically and smoothly tunes the damping coefficient without any electronic components according to the input force velocities. High order differential system of the shock absorber is constructed and simulates the system dynamics during cyclic loads. The fluid-structure interactive finite element model for key components in the absorber is established in this study. Design parameters of the damper system under certain absorbing performance requirements are determined in this paper.
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Ebrahimi, Babak, Mir Behrad Khamesee e M. Farid Golnaraghi. "Design of an Electromagnetic Shock Absorber". In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43217.
Testo completoAbstract (sommario):
This paper presents the design, modeling, and Finite Element (FE) analysis of a novel Electromagnetic Damper (ED). This cost-effective, regenerative ED is based on the concept of the tubular, linear, brushless dc motor. The structure of the proposed passive ED is straightforward, and it does not require an external power supply. An analytical model of the system is obtained using the magnetic circuit method and used to optimize the non-dimensional geometry factors and to estimate the electromagnetic forces and flux induced in the system. The model can be used to design high-performance dampers for various applications. To confirm the design, dynamic FE simulations were conducted and compared with the analytical and experimental results.
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Yu, Muchun, Zhiling Niu, Peng Zhao e Zijun Zhang. "A Novel Approach for Shock Absorber----Colloidal Damper". In 2nd International Conference on Computer Engineering, Information Science & Application Technology (ICCIA 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/iccia-17.2017.151.
Testo completo
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Cossalter, Vittore, Alberto Doria, Roberto Pegoraro e Luca Trombetta. "Testing and Modelling of an Advanced Motorcycle Shock Absorber". In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24293.
Testo completoAbstract (sommario):
In shock absorbers damper-rod force not only depends on damper-rod velocity, but also on position and acceleration. Since hydraulic losses are responsible for velocity-dependent forces, other phenomena are responsible for the dependence of force on position and acceleration, they are: compliances of the chambers and of the seals, compressibility of oil and gas and inertia of oil. The presence of position and/or acceleration-dependent terms in the force causes a hysteresis loop in the force-velocity diagram and a delay between force and velocity in the force-time diagram, which affect the performance of the shock absorber. Usually test benches measure only the damper-rod force, hence, it is difficult to recognize the physical phenomena that generate the hysteresis loop. This paper deals with a research program in which a high performance motorcycle shock absorber was tested by means of a specific test bench which includes the measurement of pressures inside the cambers during harmonic tests (frequency range 1–7 Hz). The experimental results with proper mathematical models made it possible to analyze the hysteresis loops of the pressures in the various chambers and the generation of the hysteresis loop and time delay of damper-rod force. First some experimental results dealing with pressures inside compression, rebound and compensation chambers are shown. Then a simplified mathematical model is presented, it is able to capture the most relevant physical phenomena that generate the hysteresis loop of the total force. Finally a complete model of the shock absorber is described, it takes into account details of oil motion inside the valves and it is able to predict the behavior of the shock absorber for a wide range of working conditions. Some numerical results obtained with the complete model are presented and compared with experimental results.
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Salem, A. M., e S. Olutunde Oyadiji. "Comparisons Between Dynamic Characteristics of Pneumatic, Magnetorheological, and Hydraulic Shock Absorbers". In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82498.
Testo completoAbstract (sommario):
The dynamic performance of automotive vehicles is influenced by the suspension system design. Suspensions owing damping elements with a wide range of non-linear behaviour can provide higher mobility and better ride comfort performances. Pneumatic suspensions due to their inherent nonlinear behaviour can provide high mobility performance while suspensions with MR dampers can provide this nonlinearity through the controllable damping force produced by the control of the MR fluid. The pneumatic and MR suspension models are usually developed from experimental force-displacement and force-velocity characteristics. The purpose of this paper is to measure and compare the dynamic characteristics of pneumatic, magnetorheological, and hydraulic shock absorbers. The study is carried out through measuring the characteristics of the different types of dampers at different frequencies and amplitudes using an Electro-Servo Hydraulic (ESH) testing machine. The shock absorber is subjected to sinusoidal excitation of frequency varying from 0 to 10 Hz, and amplitude varying from 0 to 10 mm. In the case of the MR damper, the tests are also done at different current levels of between 0 and 2 amp. The input displacement and acceleration to the shock absorber were measured using an LVDT (Linear Voltage Displacement Transducer) and an accelerometer, respectively while the input velocity was derived from the measured displacement and acceleration. This dual identification of the input velocity was done in order to ensure accurate representation of the velocity. The output force response of the shock absorber was measured by means of a force transducer. The force-displacement and force-velocity characteristics of each shock absorber were subsequently derived from the measured data. The results show the tunability of the MR damper characteristics in comparison to those of the pneumatic and hydraulic dampers.
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Herr, F., T. Mallin, J. Lane e S. Roth. "Flow Analysis and Modeling of Shock Absorbers". In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0473.
Testo completoAbstract (sommario):
Abstract A Computational Fluid Dynamics (CFD) method, combined with a dynamic modeling technique were introduced to study the flow and performance of automotive hydraulic damper / shock absorbers. The flow characteristics of component obtained by using CFD was applied to dynamic modeling package to predict the damping force. The component CFD analysis showed unique features as far as flow part tern, discharge coefficients and pressure distribution for various shock absorber components. Dynamic damper model was constructed by using a commercial package Easy5 with flow information provided by CFD. A simple representation of the complicated design of shocks as a network of fixed and variable restrictions in series and parallel connected by compliant volumes of oil is suitable for capturing the dynamics important to vehicle handling simulations.
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Ahmadian, Mehdi, James C. Poynor e Jason M. Gooch. "Application of Magneto Rheological Dampers for Controlling Shock Loading". In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0100.
Testo completoAbstract (sommario):
Abstract This study will examine the effectiveness of magneto-rheological (MR) dampers for controlling shock dynamics. Using a system that includes a 50-caliber rifle and a magneto-rheological damper, it is experimentally shown that MR dampers can be quite effective in controlling the compromise that commonly exists between shock forces and strokes across the shock absorber mechanism. A series of tests are conducted to demonstrate that different damping forces by the MR damper can result in different shock-force/stroke profiles. The test results further show that MR dampers can be used in a closed-loop system to adjust the shock loading characteristics in a manner that fits the dynamic system constraints and requirements.
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Yang, Yong-Gang, Peng Yu e Shi-Xing Zhu. "Nonlinear hysteretic biviscous damper model of a magnetorheological shock absorber". In 2015 International Conference on Mechanics and Mechatronics (ICMM2015). WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814699143_0026.
Testo completo
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Lindler, Jason E., e Norman M. Wereley. "Double Adjustable Shock Absorbers Utilizing Electrorheological and Magnetorheological Fluids". In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1707.
Testo completoAbstract (sommario):
Abstract Double adjustable shock absorbers allow for independent adjustment of the yield force and post-yield damping in the force versus velocity response. To emulate the performance of a conventional double adjustable shock absorber, an electrorheological (ER) and magnetorheological (MR) automotive shock absorber were designed and fabricated at the University of Maryland. For the ER shock absorber, an applied electric field between two tubular electrodes, located in the piston head, increases the force required for a given piston rod velocity. For the MR shock absorber, an applied magnetic field between the core and flux return increases the force required for a given piston rod velocity. For each shock absorber, two different shaped gaps meet the controllable performance requirements of a double adjustable shock absorber. A uniform gap allows for control of the yield force of the shock absorber, while a non-uniform gap allows for control of the post-yield damping. Force measurements from sinusoidal displacement cycles, recorded on a mechanical damper dynamometer, validate the performance of uniform and non-uniform gaps for adjustment of the yield force and post-yield damping, respectively.
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Li, Zhongjie, Lei Zuo, Jian Kuang e George Luhrs. "Mechanical Motion Rectifier Based Energy-Harvesting Shock Absorber". In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71386.
Testo completoAbstract (sommario):
Energy-harvesting shock absorber is able to recover the energy otherwise dissipated in the suspension vibration while simultaneously suppress the vibration induced by road roughness. It can work as a controllable damper as well as an energy generator. An innovative design of regenerative shock absorbers is proposed in this paper, with the advantage of significantly improving energy harvesting efficiency and reducing the impact forces caused by oscillation. The key component is a unique motion mechanism, which we called “mechanical motion rectifier (MMR)”, to convert the suspension’s oscillatory vibration into unidirectional rotation of the generator. An implementation of motion rectifier based harvester with high compactness is introduced and prototyped. A dynamic model is created to analyze the general properties of the motion rectifier by making analogy between mechanical systems and electrical circuits. The model is capable of analyzing electrical and mechanical components at the same time. Both simulation and experiments are carried out to verify the modeling and the advantages. The prototype achieved over 60% efficiency at high frequency, much better than the conventional regenerative shock absorbers in oscillatory motion. Furthermore, road tests are done to verify the feasibility of the MMR shock absorber, in which more than 15 Watts’ electricity is harvested while driving at 15 mph. The motion rectifier based design can also be used for other applications of electromagnetic vibration energy harvesting.