Gotowe bibliografie tematyczne / DOF QUARTER CAR MODEL

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Gotowa bibliografia na temat „DOF QUARTER CAR MODEL”

Autor: Grafiati

Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "DOF QUARTER CAR MODEL"

Jain, Saransh, Shubham Saboo, Catalin Iulian Pruncu i Deepak Rajendra Unune. "Performance Investigation of Integrated Model of Quarter Car Semi-Active Seat Suspension with Human Model". Applied Sciences 10, nr 9 (2.05.2020): 3185. http://dx.doi.org/10.3390/app10093185.

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In this paper, an integrated model of a semi-active seat suspension with a human model over a quarter is presented. The proposed eight-degrees of freedom (8-DOF) integrated model consists of 2-DOF for the quarter car model, 2-DOF for the semi-active seat suspension and 4-DOF for the human model. A magneto-rheological (MR) damper is implemented for the seat suspension. The fuzzy logic-based self-tuning (FLST) proportional–integral–derivative (PID) controller allows to regulate the controlled force on the basis of sprung mass velocity error and its derivative as input. The controlled force is tracked by the Heaviside step function which determines the supply voltage for the MR damper. The performance of the proposed integrated model is analysed, in-terms of human head accelerations, for several road profiles and at different speeds. The performance of the semi-active seat suspension is compared with the traditional passive seat suspension to validate the effectiveness of the proposed integrated model with a semi-active seat suspension. The simulation results show that the semi-active seat suspension improves the ride comfort significantly by reducing the head acceleration effectively compared to the passive seat suspension.

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Aliza, Che Amran, Fen Ying Chin, Mariam Md Ghazaly, Shin Horng Chong i Vasanthan Sakthivelu. "Development of Passive Quarter Car Suspension Prototype". Applied Mechanics and Materials 761 (maj 2015): 238–44. http://dx.doi.org/10.4028/www.scientific.net/amm.761.238.

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In this paper, a construction of a prototype to represent passive vehicle suspension system for quarter car model is considered. The prototype is represented by two degree-of freedom quarter-car model which are conventionally used by researchers. This laboratory equipment is developed in order to familiarize students with 2 DoF passive suspension system model. It consists of two masses, two springs and a damper. This equipment is easily dismantled and could be assembled with different spring and damper constants which contribute to different characteristics of the suspension system. A number of experiments have been carried out using the experiment setup in order to identify the suspension system characteristics i.e. experiments with different vehicle body mass, different period for one pulse and different pulse width of input pressure of the road excitation have been conducted. The experiment results are evaluated based on the vehicle body displacement and tire displacement of the prototype. Experiment results show that the pulse width of the input pressure or road profile is directly affected the characteristic of this passive suspension system. Lastly, simulations were done in order to compare the simulation and experimental results.

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Chen, Xiaoliang, Hao Song, Sixia Zhao i Liyou Xu. "Ride comfort investigation of semi-active seat suspension integrated with quarter car model". Mechanics & Industry 23 (2022): 18. http://dx.doi.org/10.1051/meca/2022020.

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A method for parameter identification of the magnetorheological damper (MRD) model with an improved firefly algorithm (IFA) is proposed, and a semi-active seat control system with three-degree-of-freedom (3-DOF) is established by combining with a quarter car model to investigate the ride comfort. The dynamic characteristics of the MRD were analyzed by experimental method. Combined with the IFA, the parameters of the MRD phenomenon model were identified, and the forward model of the MR damper was constructed. The semi-active control model of a 3-DOF seat suspension was established. The MRD controller and suspension system controller were designed. The passive control, PID control, and Fuzzy-PID control on the vibration reduction of the semi-active seat suspension were compared and analyzed, under different road excitation. The simulation results show that the semi-active seat suspension controlled by the PID and Fuzzy-PID can effectively reduce the seat acceleration and dynamic stroke, which significantly improve the ride comfort and operation safety compared to the passive seat suspension.

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Park, Manbok, i Seongjin Yim. "Design of Static Output Feedback and Structured Controllers for Active Suspension with Quarter-Car Model". Energies 14, nr 24 (7.12.2021): 8231. http://dx.doi.org/10.3390/en14248231.

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This paper presents a method to design active suspension controllers for a 7-Degree-of-Freedom (DOF) full-car (FC) model from controllers designed with a 2-DOF quarter-car (QC) one. A linear quadratic regulator (LQR) with 7-DOF FC model has been widely used for active suspension control. However, it is too hard to implement the LQR in real vehicles because it requires so many state variables to be precisely measured and has so many elements to be implemented in the gain matrix of the LQR. To cope with the problem, a 2-DOF QC model describing vertical motions of sprung and unsprung masses is adopted for controller design. LQR designed with the QC model has a simpler structure and much smaller number of gain elements than that designed with the FC one. In this paper, several controllers for the FC model are derived from LQR designed with the QC model. These controllers can give equivalent or better performance than that designed with the FC model in terms of ride comfort. In order to use available sensor signals instead of using full-state feedback for active suspension control, LQ static output feedback (SOF) and linear quadratic Gaussian (LQG) controllers are designed with the QC model. From these controllers, observer-based controllers for the FC model are also derived. To verify the performance of the controllers for the FC model derived from LQR and LQ SOF ones designed with the QC model, frequency domain analysis is undertaken. From the analysis, it is confirmed that the controllers for the FC model derived from LQ and LQ SOF ones designed with the QC model can give equivalent performance to those designed with the FC one in terms of ride comfort.

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D’Andrea, Danilo, Giacomo Risitano, Ernesto Desiderio, Andrea Quintarelli, Dario Milone i Fabio Alberti. "Artificial Neural Network Prediction of the Optimal Setup Parameters of a Seven Degrees of Freedom Mathematical Model of a Race Car: IndyCar Case Study". Vehicles 3, nr 2 (20.06.2021): 300–329. http://dx.doi.org/10.3390/vehicles3020019.

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The aim of this paper is the development of a 7-DOF (Degrees Of Freedom) mathematical model of an IndyCar and the implementation of an Artificial Neural Network in order to predict the optimal setup parameters of the car, reducing time and costs for race teams. The mathematical model is created by using MATLABTM and Simulink software starting from a telemetry acquisition at the Houston circuit and is based on Vertical Vehicle Dynamic equations. The optimal setup parameters have been predicted through an Artificial Neural Network (ANN) by using the NFTOOL Toolbox of MATLABTM software. ANN is implemented in a Quarter Car model, firstly, in order to train the network and predict the parameters able to reduce tire deflection and suspension travel in the time domain and the resonance peaks amplitude in the frequency domain. Then, it is implemented in the 7-DOF model in order to predict the best setup parameters able to reduce body movements and the weight transfers of the car.

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Mahmood, Mahmood, Ameen Nassar i Haider Mohammad. "Analysis and Study Indicators for Quarter Car Model with Two Air Suspension System". Basrah journal for engineering science 22, nr 2 (24.12.2022): 16–22. http://dx.doi.org/10.33971/bjes.22.2.3.

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Modeling and simulation of non-linear quarter-car suspension system for two air spring models (traditional and dynamic new air spring) are contrasted in terms of (RMS) sprung mass acceleration, dynamic load coefficient, the vertical displacement, they are compared. Two and three (DOF) of the mathematical quarter models are implemented in MATLAB/Simulink platform. The Ride Comfort (RC), Dynamic Load Coefficient (DLC) and Road Handling (RH) responses are evaluated as objective functions respectively considering a vehicle speed at 72 km/h and road ISO Class B. The obtained results indicate that the vertical displacement, the (RMS) of the sprung mass acceleration, and dynamic load coefficient values with the new air model system decrease by 10.7 %, 30.6 %, and 13.49 % respectively, in comparison to a tradition suspension system, this one gives more comfort and effortless handling.

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Silveira, M., P. Wahi i J. C. M. Fernandes. "Effects of asymmetrical damping on a 2 DOF quarter-car model under harmonic excitation". Communications in Nonlinear Science and Numerical Simulation 43 (luty 2017): 14–24. http://dx.doi.org/10.1016/j.cnsns.2016.06.029.

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Hac´, A., i I. Youn. "Optimal Semi-Active Suspension with Preview Based on a Quarter Car Model". Journal of Vibration and Acoustics 114, nr 1 (1.01.1992): 84–92. http://dx.doi.org/10.1115/1.2930239.

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This paper deals with the synthesis of an optimal yet practical finite preview controller for a semi-active dissipative suspension system based on a two-degree-of-freedom (2-DOF) vehicle model. The proposed controller utilizes knowledge about approaching road disturbances obtained from preview sensors to minimize the effect of these disturbances. A truly optimal control law, which minimizes a quadratic performance index under passivity constraints, is derived using a variational approach. The optimal closed loop system becomes piecewise linear varying between two passive systems and a fully active one. It is shown that the steady state system response to a periodic input is also periodic and its amplitude is proportional to the amplitude of the input. Therefore, frequency domain characteristics in a classical sense can be generated. The problem formulation and the analytical solution are given in a general form and hence they apply to any bilinear system with system disturbances that are a priori unknown but some preview information is possible. The results of this analysis are applied to a quarter car model with semi-active suspension whose frequency domain and time domain performances are evaluated and compared to those of fully active and passive models. The effect of preview time on the system performance is also examined.

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Narayanan, S., i S. Senthil. "STOCHASTIC OPTIMAL ACTIVE CONTROL OF A 2-DOF QUARTER CAR MODEL WITH NON-LINEAR PASSIVE SUSPENSION ELEMENTS". Journal of Sound and Vibration 211, nr 3 (kwiecień 1998): 495–506. http://dx.doi.org/10.1006/jsvi.1997.1396.

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Krauze, Piotr, i Jerzy Kasprzyk. "Mixed Skyhook and FxLMS Control of a Half-Car Model with Magnetorheological Dampers". Advances in Acoustics and Vibration 2016 (25.10.2016): 1–13. http://dx.doi.org/10.1155/2016/7428616.

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The problem of vibration attenuation in a semiactive vehicle suspension is considered. The proposed solution is based on usage of the information about the road roughness coming from the sensor installed on the front axle of the vehicle. It does not need any preview sensor to measure the road roughness as other preview control strategies do. Here, the well-known Skyhook algorithm is used for control of the front magnetorheological (MR) damper. This algorithm is tuned to a quarter-car model of the front part of the vehicle. The rear MR damper is controlled by the FxLMS (Filtered-x LMS) taking advantage of the information about the motion of the front vehicle axle. The goal of this algorithm is to minimize pitch of the vehicle body. The strategy is applied for a four-degree-of-freedom (4-DOF) vehicle model equipped with magnetorheological dampers which were described using the Bouc-Wen model. The suspension model was subjected to the road-induced excitation in the form of a series of bumps within the frequency range 1.0–10 Hz. Different solutions are compared based on the transmissibility function and simulation results show the usefulness of the proposed solution.

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Rozprawy doktorskie na temat "DOF QUARTER CAR MODEL"

Jaroš, Petr. "Konstrukce 1/4 modelu vozidla pro testy tlumičů". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442802.

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This thesis deals by the design of 1/4 car model for testing vehicle dampers, which can be used to simulate the real suspension of a vehicle wheel (up to a maximum car weight of 1,970 kg) and the so-called linear wheel suspension. A linear mathematical 1/4 car model with 2 DOF (Degrees Of Freedom) and data from literature search are used to design and derive the basic parameters of the device. The thesis contains a description of the linear mathematical model and its outputs (acceleration of the sprung mass and forces acting on the sprung mass), description of designed device, descriptions of created simulations (static, modal and harmonic analysis in ANSYS Workbench 2020 R2) and conceptual design of the modifications this device for another possible use for testing of bicycles.

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Salem, Mahmoud. "Investigation of a non-linear suspension in a quarter car model". Thesis, Aston University, 2018. http://publications.aston.ac.uk/37523/.

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This thesis presents the study of a quarter car model which consists of a two-degree-of-freedom (2 DOF) with a linear spring and a nonlinear spring configuration. In this thesis, the use of non-linear vibration attachments is briefly explained, and a survey of the research done in this area is also discussed. The survey will show what have been done by the researches in this new field of nonlinear attachments. Also, it will be shown that this topic was not extensively researched and is a new type of research where no sufficient experimental work has been applied. As an application, a quarter car model was chosen to be investigated. The aim of the Thesis is to validate theoretically and experimentally the use of nonlinear springs in a quarter car model. Design the new type of suspension and insert it in the experimental set up, built from the ground up in the laboratory. A novel criterion for optimal ride comfort is the root mean square of the absolute acceleration specified by British standards ISO 2631-1997. A new way to reduce vibrations is to take advantage of nonlinear components. The mathematical model of the quarter-car is derived, and the dynamics are evaluated in terms of the main mass displacement and acceleration. The simulation of the car dynamics is performed using Matlab® and Simulink®. The realization of vibration reduction through one-way irreversible nonlinear energy localization which requires no pre-tuning in a quarter car model is studied for the first time. Results show that the addition of the nonlinear stiffness decreases the vibration of the sprung mass to meet optimal ride comfort standards. As the passenger is situated above the sprung mass, any reduction in the sprung mass dynamics will directly have the same effect on the passenger of the vehicle. The future is in the use of a nonlinear suspension that could provide improvement in performance over that realized by the passive, semi active and active suspension. The use of a quarter car model is simple compared to a half car model or a full car model, furthermore in the more complex models you can study the heave and the pitch of the vehicle. For the initial study of the nonlinear spring the quarter car model was sufficient enough to study the dynamics of the vehicle. Obtaining an optimum suspension system is of great importance for automotive and vibration engineer involved in the vehicle design process. The suspension affects an automobile’s comfort, performance, and safety. In this thesis, the optimization of suspension parameters which include the spring stiffness and damper coefficient is designed to compromise between the comfort and the road handling. Using Genetic algorithm an automated optimization of suspension parameters was executed to meet performance requirements specified. Results show that by optimizing the parameters the vibration in the system decreases immensely.

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Allen, Justin Aaron. "Design of active suspension control based upon use of tubular linear motor and quarter-car model". Texas A&M University, 2008. http://hdl.handle.net/1969.1/86036.

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The design, fabrication, and testing of a quarter-car facility coupled with various control algorithms are presented in this thesis. An experimental linear tubular motor, capable of producing a 52-N force, provides control actuation to the model. Controllers consisting of two designs were implemented: a classical controller employing lead and lag networks and a state-space feedback design. Each design was extensively simulated to screen for receptiveness to actuation force limitations and robustness regarding the inexact tire modeling. The goal of each controller was to minimize the acceleration of the sprung mass in the presence of simulated road disturbances, modeled by both sinusoidal and step input excitation wheels. Different reference velocity inputs were applied to the control scheme. Responses to a zero reference were juxtaposed to those that resulted from tracking a reference built off a model that incorporated inertial-frame damping attached to the sprung mass. The outcome of this comparison was that low-frequency disturbances were attenuated better when tracking a zero reference, but the reference relaxation introduced by the inertialframe damping model allowed for better-attenuated high frequency signals. Employing an inertial-frame damping value of 250 N-s/m, the rejected frequency component of the system response synchronous with the disturbance input excitation of 40 rad/s bettered by 33% and 28% when feeding control force from the classical controller and state-space controller, respectively. The experimental analysis conducted on the classical and state-space controllers produced sinusoidal disturbance rejection of at worst 50% within their respective bandwidths. At 25 rad/s, the classical controller was able to remove 80% of the base component synchronous with the disturbance excitation frequency, while the state-space controller filtered out nearly 60%. Analysis on the system's ability to reject step disturbances was greatly confounded with the destructive lateral loading transferred during the excitation process. As a result, subjection to excitation could only occur up to 25 rad/s. At the 20 rad/s response synchronous to the disturbance excitation, the classical and state-space controllers removed 85% and 70% of the disturbance, respectively. Sharp spikes in timebased amplitude were present due to the binding that ensued during testing.

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Nguyen, Michal. "Vliv charakteristik tlumiče na jízdní dynamiku". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378138.

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Blažek, Jakub. "Využití vzduchových pružin u závodního vozu". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230976.

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This diploma thesis studies the use of air springs for race car, precisely Formula Student race car. Research part of the thesis deals with choosing suitable air spring for given application. In practical part, there is computation of parameters for appropriate setting of air spring, so it will comply with the rules of Formula Student. There is also simulation of air spring functionality in real use.

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Vaněk, Vojtěch. "Diagnostika stavu tlumiče za jízdy vozidla". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-445178.

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The diploma thesis deals with the analysis of the effects of shock absorber wear on the driving dynamics of the vehicle. Furthermore, a quarter model of the car was created in the Simulink software, where a procedure for evaluating the condition of the shock absorber while driving the vehicle was created. This procedure was subsequently validated on real measured data from the Hummer H3 car.

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Fani, Mehran. "Fault diagnosis of an automotive suspension system". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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With the development of the embedded application and driving assistance systems, it becomes relevant to develop parallel mechanisms in order to check and to diagnose these new systems. In this thesis we focus our research on one of this type of parallel mechanisms and analytical redundancy for fault diagnosis of an automotive suspension system. We have considered a quarter model car passive suspension model and used a parameter estimation, ARX model, method to detect the fault happening in the damper and spring of system. Moreover, afterward we have deployed a neural network classifier to isolate the faults and identifies where the fault is happening. Then in this regard, the safety measurements and redundancies can take into the effect to prevent failure in the system. It is shown that The ARX estimator could quickly detect the fault online using the vertical acceleration and displacement sensor data which are common sensors in nowadays vehicles. Hence, the clear divergence is the ARX response make it easy to deploy a threshold to give alarm to the intelligent system of vehicle and the neural classifier can quickly show the place of fault occurrence.

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Jurka, Adam. "Efekt tlumiče na limity vozidla". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417730.

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The aim of this master’s thesis is to evaluate the effect of shock absorber on vehicle limits. At the beginning of the thesis, shock absorber properties were described. Then computational model was created and manoeuvres for shock absorber behaviour were defined. Created mathematical model is based on quarter model of a car and excitation in form of road with a random profile is an essential part of the model. This model was used for evaluation of heave. After heave analysis, shock absorber behaviour during drive was investigated. Drive conditions were defined as set of handling manoeuvres. For the drive investigation, complete multibody virtual model of racing car was used. Based on drive investigation analysis, optimal damping characteristics for each manoeuvre were found. Furthermore, each optimal characteristic was compared for different manoeuvres. Obtained results were compared. As a conclusion, compromise damping characteristic was suggested with the aim to fit the combination of all defined drive conditions. Final part of the thesis was aimed at validation of the computational model. Data measured during real drive were used as an input for this validation.

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Baroš, Martin. "Experimentální identifikace profilu vozovky". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254354.

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The diploma thesis focuses especially on a design of a way for evaluating roughness in road profile, which affects driving characteristics of a car and a ride. In the theoretical part of the thesis are mentioned the most used methods and tools for road roughness analysis in the world. For the purposes of this thesis an experimental measuring were undertaken in order to obtain data for the own design of a road profile analysing system.

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Egorov, Artemii. "Testování vozidla na čtyřkanálovém vertikálním simulátoru vozovky". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417460.

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The object of this master thesis is testing of vehicle using four post rig. The main goal is to make a research about testing and tuning vehicle characteristics on four post rig in order to implement them for testing of TU Brno Racing’s Formula Student racecar. The main method of testing, input signals and measurement description are presented in this thesis. The different methods of analysis of testing data to find best tuning of damper and spring stiffness for different race disciplines are described. In the last part of this work, quarter car model and multibody model in MSC Adams Car is created. Input parameters of model are based on measurements from real car/ component testing, including damper characteristics and static tire radial stiffness for best fit with the characteristics of real vehicle. The measurements themselves were also described in separate chapter of this thesis. The last but not the least goal was to compare these simulations with measurements, made od real four post rig in order to decide whether car model is suitable for racecar development.

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Książki na temat "DOF QUARTER CAR MODEL"

De Souza, Jonathan. Horns To Be Heard. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780190271114.003.0007.

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How do listeners relate to musial instruments that they do not play? This chapter investigates technically mediated modes of listening in the context of Haydn’s horn music. The valveless horns in Haydn’s orchestra had distinctive pitch affordances, which gave rise to several idiomatic figures. This instrumental invariance can shape tonal expectations, affecting how the music appears to listeners. Haydn (and other composers) also used horn calls in compositions for other instrumental forces. If situated listeners are attuned to schematic instrumental textures—if, for example, they can hear virtual horns in a string quartet or piano piece—this implies that their perception is grounded in multimodal experiences of instruments. Like performance, then, listening is both embodied and conditioned by technology.

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Części książek na temat "DOF QUARTER CAR MODEL"

Jazar, Reza N. "⋆ Quarter Car Model". W Vehicle Dynamics, 985–1026. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-8544-5_15.

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Chauhan, Avijit, i Patrick Sabiniarz. "Capturing Brake Groan Using Multibody Quarter Car Model". W Lecture Notes in Mechanical Engineering, 1778–85. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38077-9_203.

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Nanthakumar, A. J. D., Karan Jariwala, Kumawat Harshit, S. Yokeshwaran i S. Madhankumar. "Classification of Road Profile Using Golden Car Parameters for Quarter Car Model". W Advances in Design and Thermal Systems, 341–47. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6428-8_27.

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Svahn, Fredrik, Jenny Jerrelind i Harry Dankowicz. "Suppression of Bumpstop Instabilities in a Quarter-Car Model". W Non-smooth Problems in Vehicle Systems Dynamics, 137–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01356-0_12.

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Anandan, Arivazhagan, Arunachalam Kandavel i Arockia Suthan Soosairaj. "Comparison of Quarter Car Suspension Model Using Two Different Controllers". W Lecture Notes in Mechanical Engineering, 195–204. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2697-4_22.

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Rónai, László. "Investigation of the Vibrational Behavior of a Quarter-Car Model". W Vehicle and Automotive Engineering 4, 824–34. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15211-5_68.

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Hanwate, Sandeep D., i Rohini K. Bhalerao. "Optimum Fractional-Order PID for Active Suspension of Quarter Car Model Control". W Studies in Infrastructure and Control, 195–205. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3501-5_11.

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Paliwal, Vipul, Ritvik Dobriyal, Pushpendra Kumar i Niraj Kumar Jha. "Quarter Car Model With Power Law Damper Excited by a Road Profile". W Lecture Notes in Mechanical Engineering, 707–14. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9956-9_69.

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Nguyen, Dang Quy, Sina Milani, Hormoz Marzbani i Reza N. Jazar. "Vehicle Vibration Analysis of the Quarter-Car Model Considering Tire-Road Separation". W Nonlinear Approaches in Engineering Application, 429–65. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-82719-9_9.

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Patel, Vyomkumar P., Vijaykumar S. Jatti i Vinaykumar S. Jatti. "Design of Quarter Car Model for Active Suspension System and Control Optimization". W Optimization Methods for Structural Engineering, 211–25. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2378-6_9.

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Streszczenia konferencji na temat "DOF QUARTER CAR MODEL"

Wu, Long, i Lei Zuo. "A Novel Performance Analysis Method for a Full Vehicle Suspension Based on Quarter Car Model". W ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67343.

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In vehicle dynamics researchers traditionally investigate the suspension performance based on a quarter car model and then reestablish a comprehensive model for the full car by considering additional degrees of freedom (DOF). Based on the derivation of the coupling ratios between the sprung mass of a full car and four sprung masses of quarter cars, the analysis of a full vehicle dynamics with fourteen DOFs in vertical and lateral directions is possible. The full car model can be expressed by four independent quarter car models. An analysis method will be investigated in order to provide a novel performance estimation for a full vehicle suspension. The case study shows that the vibrations of a full vehicle can be quantitatively obtained based on the test results of quarter suspensions.

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Balike, Krishna Prasad, Subhash Rakheja i Ion Stiharu. "A Comprehensive Quarter-Car Model for Kinematic and Dynamic Analysis of a Suspension". W ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11621.

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The conflicting dynamic performances of a vehicle such as ride quality, road holding and rattle space requirements have been widely studied using either linear or nonlinear two DOF quarter-car models. Such models, however, cannot account for contributions due to suspension kinematics and joint compliances. Considering the proven simplicity and effectiveness of a quarter-car model for such analyses, this paper discusses a comprehensive quarter-car dynamic model to study the influences of the linkage geometry and flexible joint bushings on selected performance measures. An in-plane two-DOF model was formulated for a double wishbone suspension comprising an upper control arm, a lower control arm, and a strut mounted on the lower control arm. The dynamic responses of the model were evaluated under harmonic and idealized rounded-pulse displacement excitations. The responses of the proposed model with free and flexible joint conditions were compared with those of the conventional quarter-car model to illustrate the contributions due to suspension kinematics and joint bushings. Owing to the asymmetric kinematic behavior of the suspension system, the dynamic responses of the comprehensive model were also observed to be asymmetric about the equilibrium. The responses of the model with flexible joint bushings revealed approximately 5% variations from that of the model with free joints. Furthermore, the upper control arm bushings have exhibited more significant influence on the dynamic responses than that of the lower control arm bushings.

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Algethami, Abdullah A., i Won-jong Kim. "Energy Harvesting and Damping Capability of Quarter-Car Test Bed". W ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9748.

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Recovering and regenerating power in automotive applications has drawn significant interest recently. A car-suspension system can be modeled as a 2-DOF mass-spring-damper system. Active control used for the car suspension system produces results superior to other methods. In this study, a 3-phase linear generator is used to harvest energy and suppress vibration on a quarter-car suspension setup. The suspension system is analyzed to estimate the harvestable power and damping capability of the generator. Analysis for the generator and its efficiency are presented. Harvestable power of around 105 mW was achieved at a 3.5-Hz input disturbance. The regenerative suspension system can reduce the vibration of the sprung-mass acceleration by up to 22% in an indexed performance. Around 8.4 W used to drive the motor in active control was saved when the regenerative system was used. As a result, much energy can be saved by switching from the active to the energy-harvesting mode. A more efficient system can be designed by matching the mechanical and electromagnetic (EM) damping.

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Mohammadi, Ardeshir Karami. "Vehicle Active Suspension Control: Using AaVariable Structure Model Reference Adaptive Controller". W ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82712.

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A Variable Structure Model Reference Adaptive Controller (VS-MRAC) is proposed for Active control of vehicle suspension. One DOF quarter car model has been considered. The reference model is a one DOF vibrating system with skyhook damper. The structure of the switching functions is designed based on global exponential stability requirements, and shows perfect model following at a finite time. Sliding surfaces are independent of system parameters and therefore VS-MRAC is insensitive to system parameter variations. Simulation is presented for some road irregularities, and compares to active suspension with fixed structure MRAC, and passive suspension. VS-MRAC shows the best performance on ride and working space

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Wang, Shuo, Mohammad Elahinia, The Nguyen, Walter Anderson i Constantin Ciocanel. "Analysis and Control of Displacement Transmissibility and Force Transmissibility for a Two DOF Model Based on Quarter Car Concept using a Mixed Mode Magnetorheological Fluid Mount". W SAE 2010 Commercial Vehicle Engineering Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2010. http://dx.doi.org/10.4271/2010-01-1911.

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Goodarzi, Avesta, i Amir Jalali. "A New Lumped-Mass Vehicle Ride Model Considering Body Flexibility". W ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95267.

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Ride comfort is one of the most important criteria by which people judge the total quality of the car. Traditionally to investigate the vehicle ride comfort, some well-known classical lumped-mass models are used. In these models such as quarter car model, half car model and full vehicle model, body flexibility has been ignored and sprung mass (vehicle body) assumed to be rigid. This assumption can reduce the model accuracy, specially in the case of long vehicles such as vans, buses and trucks. To impose body flexibility in the ride analysis, recently some numerical FEM-based models have been introduced, but they are complex and non-parametric. In this paper the effects of body flexibility on the vehicle vibration behavior has been studied based on an analytical approach. For this purpose, a new simple and parametric lumped-mass 8 DOF model has been developed. Comparison of the results of natural frequency analysis and forced vibration analysis for this model with the corresponding results of so called “rigid model” or “classic model” is very informative. As the results are shown, body flexibility strongly influenced on the acceleration and displacement responses of the vehicle so that it is necessary to considering this term at the early stages of the vehicle design.

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Mahajan, Sanjay K., i Shriram Krishnan. "A Method for State Observer Design in Bilinear Suspension Systems". W ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0233.

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Abstract This paper presents a simple technique of designing state observers for bilinear suspension models. A 2-DOF quarter-car automotive suspension is considered. The technique produces observer gains which dynamically depend on the control, and are obtained through observer pole placement in a time-varying system that uses Liapunov transformation. It is shown that the proposed use of this method could be effective in the design of modulated suspension systems, with certain limitations on the control law that is used.

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Song, Xubin. "Cost Effective Skyhook Control for Vibration Isolation Systems". W ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82536.

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Traditionally a skyhook control, widely applied to vibration control, requires two sensors to measure sprung mass acceleration and relative displacement, respectively. For the implementation, these two measurement signals are converted into velocities and then the damping control signal is decided and sent to controllable HH/SS dampers. In this paper, a one sensor based skyhook control policy is developed. The proposed control policy just needs one measurement signal, sprung mass acceleration, to estimate these two velocities for semiactive control. The new strategy is explained through a typical spring-mass system of a quarter-car model. But the effectiveness of the new control approach for vibration isolation is validated with ride control through simulation study of a 7-DOF full car suspension system with application of magneto-rheological (MR) dampers.

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Pence, Benjamin L., Hosam K. Fathy i Jeffrey L. Stein. "A Base-Excitation Approach to Polynomial Chaos-Based Estimation of Sprung Mass for Off-Road Vehicles". W ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2641.

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This paper presents a novel method for identifying in real-time the sprung mass of a 2-DOF quarter-car suspension model. It does so by uniquely combining the base-excitation concept with polynomial chaos estimation. This unique combination of the two methods provides two important benefits. First, the base-excitation concept makes it possible to estimate the sprung mass without explicitly measuring or knowing the terrain profile prior to estimation. Second, the polynomial chaos estimation strategy makes it possible to perform such mass estimation using sprung and unsprung acceleration measurements without pseudo-integration filters that can be difficult to tune. This paper derives the proposed method in detail and presents computer simulations to evaluate its convergence speed and accuracy. The simulation results consistently converge to within 10% of the true mass value typically within 120 seconds.

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Veillette, R. J. "Projective Controls for 2-DOF Quarter-Car Suspension". W 1991 American Control Conference. IEEE, 1991. http://dx.doi.org/10.23919/acc.1991.4791402.

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