scholarly journals Experimental analysis on friction materials for supplemental damping devices

2021 ◽  
Author(s):  
Massimo Latour ◽  
Gianvittorio Rizzano ◽  
Vincenzo Piluso
Keyword(s):  
Experimental Tests ◽  
Electrical Machines ◽  
Kinetic Friction ◽  
Loading History ◽  
Automotive Applications ◽  
Interface Pressure ◽  
Friction Materials ◽  
Annular Disc ◽  
Supplemental Damping ◽  
Sliding Force

In this paper, the friction coefficient and the cyclic response of different interfaces for friction devices are investigated by means of experimental tests under displacement control. In particular, six interfaces have been tested: steel–steel, brass–steel, sprayed aluminum–steel and three different rubber based friction materials adopted, respectively, in automotive applications, electrical machines and applications requiring low wearing.Static and kinetic friction coefficients have been evaluated and the influence of the interface pressure has been analyzed. The variation of the sliding force during the cyclic loading history has been investigated by comparing also the response coming from the use of different washers: circular flat washers and cone shaped annular disc springs.The work is aimed at the investigation of friction materials to be applied within the connecting elements of beam-to-column joints according to the double split tee configuration with friction pads.

Coupled Simulative-Experimental Procedure for Studying the Solid State Bonding Phenomena

2011 ◽  
Vol 491 ◽  
pp. 181-188 ◽  
Author(s):  
Gianluca D'Urso ◽  
Michela Longo ◽  
Elisabetta Ceretti ◽  
Claudio Giardini
Keyword(s):  
Steady State ◽  
Solid State ◽  
Effective Stress ◽  
Experimental Tests ◽  
Rolling Process ◽  
Stress Distributions ◽  
Interface Pressure ◽  
Limit Value ◽  
Suitable Parameter ◽  
Flat Rolling

In extrusion operations, material solid state welding takes place thanks to the very high pressure and temperature at which the material undergoes between the several welding criteria developed, the attention was particularly focused on the Piwnik and Plata one. In this criterion a suitable parameter w, calculated as the interface pressure and the effective stress ratio integrated along the time, has been defined. According to this criterion the material should start to weld as this parameter exceed a limit value wlim. In the present paper a new procedure for the wlim identification as function of the temperature, based on coupled experimental-simulative strategy, is proposed. In particular, flat rolling experimental tests of sandwiches made of two rectangular specimens in AA6082 alloy were performed. The specimens were characterized by different heights in order to consider different compression ratio, that means different interface pressure and effective stress distributions. All the tests were repeated at different temperature. Once the experimental tests were performed, FEM simulations of the rolling process were run for the very same conditions. Thanks to a suitable user routine developed and implemented in the calculus code, it was possible to evaluate the steady state value of the w parameter for all the different conditions at the steady state conditions. By verifying if the actual experimental test demonstrated the presence or less of material bonding, it was possible to identify the wlim values as function of the temperature. Particular attention must be paid to the study of the macrostructure of the welded material in order to identify the influence of the process parameter on the weld quality. This means that it is possible to identify not only if the weld will take place, but also if it will be qualitatively adequate.

scholarly journals Considerations on design, development and testing of Electrical Machines for automotive HVAC

2020 ◽  
Vol 322 ◽  
pp. 01042
Author(s):  
Radu Martis ◽  
Florin Pop-Piglesan ◽  
Sorin Cosman ◽  
Claudia Martis
Keyword(s):  
Electric Vehicles ◽  
Test Bench ◽  
Low Voltage ◽  
Hvac Systems ◽  
Electrical Machines ◽  
Automotive Applications ◽  
Design Development ◽  
Driving System ◽  
Wide Range ◽  
Driving Range

HVAC represents one of the highest energy consumer in a vehicle and for full electric vehicles, the design of HVAC and the dimensioning of its driving system is of utmost importance in order to avoid the limitation of driving range. Due to its advantages, especially when it comes to power density, PMSM is one of the most used electrical machines for a wide range of automotive applications, including HVAC systems. The paper presents the generation of the requirements, design, analysis and HiL testing of a PMSM for HVAC applications. The challenge is to develop a machine answering to the requirements for an electric vehicle HVAC at low- voltage. An experimental model of the machine was tested using a test- bench, based on HiL techniques.

Fast Modelling and Identification of Hydraulic Brake Plants for Automotive Applications

2020 ◽  
Author(s):  
Luca Pugi ◽  
Federico Alfatti ◽  
Lorenzo Berzi ◽  
Tommaso Favilli ◽  
Marco  Pierini ◽  
...  
Keyword(s):  
Transfer Functions ◽  
Experimental Tests ◽  
Hybrid Vehicles ◽  
Parametric Models ◽  
Hardware In The Loop ◽  
Automotive Applications ◽  
Test Rig ◽  
Hydraulic Brake ◽  
Innovative Solution ◽  
Instrumented Vehicle

Diffusion of electric and hybrid vehicles is accelerating the development of innovative braking technologies. Calibration of accurate models of a hydraulic brake plant involves availability of large amount of data whose acquisition is expensive and time consuming. Also, for some applications, such as vehicle simulators and hardware in the loop test rig, a real-time implementation is required. To avoid excessive computational loads, usage of simplified parametric models is almost mandatory. In this work, authors propose a simplified functional approach to identify and simulate the response of a generic hydraulic plant with a limited number of experimental tests. To reproduce complex nonlinear behaviours that are difficult to be reproduced with simplified models, piecewise transfer functions with scheduled poles are proposed. This innovative solution has been successfully applied for the identification of the brake plant of an existing vehicle, a Siemens prototype of instrumented vehicle called SimRod, demonstrating the feasibility of proposed method.

scholarly journals Fatigue Analysis of Dozer Push Arms under Tilt Bulldozing Conditions

Machines ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 38
Author(s):  
Longye Pan ◽  
Xianglong Guan ◽  
Xingwei Luan ◽  
Yajun Huang ◽  
Ruwei Zhang ◽  
...  
Keyword(s):  
Experimental Tests ◽  
Fatigue Analysis ◽  
Virtual Simulation ◽  
The Other ◽  
Dynamic Loads ◽  
Virtual Model ◽  
Loading History ◽  
Time Histories ◽  
The Right ◽  
Unbalanced Loads

Tilt bulldozing generates unbalanced loads on two push arms, which leads to the service lives of the two push arms being different. Because the push arms rotate in triaxial directions during tilt bulldozing, it is difficult to accurately analyze the fatigue life of the push arm with one specific boundary condition and loading history. Therefore, a fatigue analysis of the push arms under tilt bulldozing conditions is proposed based on co-simulation of RecurDyn-EDEM-AMESim in this paper. The control of tilt bulldozing conditions is realized automatically according to the tilt angle and blade depth. The dynamic loads of the push arms are accurately calculated in this virtual model. Subsequently, the stress–time histories are obtained to investigate the fatigue lives of push arms. Both the overall damage and the initiation positions of the cracks are predicted herein. It is determined that the fatigue lives of the right and left push arms are 7,317.84 h and 39,381.89 h, respectively. Thus, the life of the push arm on the blade’s tilted side is reduced by 81.42% compared to the other side. Additionally, experimental tests are conducted to verify the accuracy of the virtual model. Analysis results indicate that the strains of the push arms according to the virtual simulation are close to those measured in the experiments.

scholarly journals Design and Application of Electrical Machines

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 523
Author(s):  
Ryszard Palka ◽  
Marcin Wardach
Keyword(s):  
Scientific Research ◽  
Experimental Tests ◽  
Electrical Machines ◽  
Simulation Studies ◽  
Research Centers ◽  
Special Issue ◽  
Design And Application

Design and Application of Electrical Machines is a Special Issue of Energies. In this Special Issue, authors from various research centers present the results of their scientific research on electrical machines. In eighteen papers, they presented simulation studies, design works, and experimental tests on built prototypes.

Development and Validation of Finite Element Structure-Tuned Liquid Damper System Models

2015 ◽  
Vol 137 (11) ◽  
Author(s):  
Islam M. Soliman ◽  
Michael J. Tait ◽  
Ashraf A. El Damatty
Keyword(s):  
Finite Element ◽  
3D Structure ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Random Excitation ◽  
System Model ◽  
Fe Model ◽  
Tuned Liquid Damper ◽  
Supplemental Damping ◽  
Sensitive Structure

Implementation of supplemental damping systems (e.g., the dynamic vibration absorbers (DVAs)) to mitigate excessive tall building vibrations induced by external dynamic loads (wind storms or earthquakes) has increased over the last several decades. A tuned liquid damper (TLD) is a specific type of the DVAs that consists of a rigid tank which is partially filled with a liquid, usually water. The sloshing liquid inside the tank provides inertia forces that counteract the forces acting on the structure, thus reducing the building motion. A single sway mode of vibration is usually targeted, however, for certain structures multiple modes may need to be suppressed. Moreover, the location of the TLD on the floor plate is important for certain modes, such as a torsionally dominate mode. In this paper, a three-dimensional (3D) finite element (FE) structure-TLD system model (3D-structure-TLD) is proposed where the TLDs can be positioned at any location on the structure allowing the most effective positions in reducing the structure's dynamic response to be determined. Therefore, the response of a 3D structure (tower, high-rise building, bridge, etc.) fitted with single or multiple TLD(s) and subjected to dynamic excitation can be predicted using the proposed FE model. For torsionally sensitive structure (eccentric/irregular structures), this type of 3D numerical analysis is highly recommended. Two nonlinear TLD models are employed to simulate the TLD and implemented in the FE model. The 3D-structure-TLD system model is validated for the cases of sinusoidal and random excitation forces using existing experimental test values. Results from the 3D-structure-TLD system model are found to be in excellent agreement with values obtained from experimental tests.

scholarly journals Bamboo Fibre-reinforced Semi-Metallic Brake Friction Materials for Automotive Applications

2016 ◽  
Vol 82 ◽  
pp. 02003 ◽  
Author(s):  
R. J. Talib ◽  
K. Ramlan ◽  
N.I. Ismail ◽  
M.F. Ismail ◽  
A. O. Eliasidi
Keyword(s):  
Automotive Applications ◽  
Friction Materials ◽  
Bamboo Fibre
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