Relevant bibliographies by topics / Disc Thickness Variation (DTV)

Academic literature on the topic 'Disc Thickness Variation (DTV)'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Disc Thickness Variation (DTV)"

1

Jacobsson, H. "Disc brake judder considering instantaneous disc thickness and spatial friction variation." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, no. 5 (May 1, 2003): 325–42. http://dx.doi.org/10.1243/095440703321645043.

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Brake judder is a braking-induced vibration. The character of judder is typical of forced vibrations passing through a critical speed. No specific friction characteristic is needed for judder to occur. In two previous models, i.e. a rotor-stator model and a whole vehicle model, the vibration during a brake application was simulated. The vibrations were assumed to be driven by a brake torque variation (BTV) during a wheel revolution. The BTV was assumed to be proportional to the brake pressure variation (BPV) which was measured. Moreover, the proportionality constant was assumed to be independent of the braking conditions. Verifying measurements were made on a street going vehicle with strong disc thickness variation (DTV) on one of its front wheels. The measured vibration variation during braking was predicted almost exactly by the models. However, the maximum measured vibration level could only be approximated. In the present paper a more accurate analysis of the measurements was found to improve strongly the agreement between predicted and measured vibrations. Hence, the deviation in slope between measured and experimentally generated curves was markedly reduced by replacing the overall mean values of brake pressure level, etc. by slowly varying time functions. The new extended model of the present paper takes into account that the BTV may be generated by variations in normal force (i.e. BPV) and other synchronous variations (called BXV), e.g. spatial friction variation and variation of the equivalent brake radius. The result indicates that BXV may be induced by high BPV levels. Even at judder vibrations primarily caused by heavy DTV (20 μm or more in the cold state), there may be considerable contributions to the vibration level from other synchronous disturbances, i.e. BXV. Further, it was found that the pad stiffness increases with the brake pressure. For such a pad stiffness characteristic, an increase of the DTV level (for whatever reason) by 50 per cent might result in more than a 100 per cent increase in the corresponding BPV and BTV levels. Hence, a progressive pad is more sensitive to increases of the DTV level than a linear pad would be.
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Jung, Sung Pil, Hyun Seok Song, Tae Won Park, and Won Sun Chung. "Numerical Analysis of Thermoelastic Instability in Disc Brake System." Applied Mechanics and Materials 110-116 (October 2011): 2780–85. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2780.

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Thermal energy generated by the friction between the disc and pad is transferred to both components and causes thermal expansion of material of each component, and futher affects the friction contact condition. This is the main factor of the thermoelastic instability (TEI) of a disc brake. In this study, TEI is analyzed using the finite element analysis technique. Three dimensional thermo-mechanical analysis model of the disc brake system is created. An intermediate processor based on the staggered approach is used to exchange analysis results: temperature, friction contact power, nodal displacement and deformation. Disc thickness variation (DTV) and temperature distribution of the disc are calculated, and the tendency and meaning of the results are discussed.
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Febriani, Risky Ayu, Hong-Seok Park, and Chang-Myung Lee. "A Rule-Based System for Quality Control in Brake Disc Production Lines." Applied Sciences 10, no. 18 (September 20, 2020): 6565. http://dx.doi.org/10.3390/app10186565.

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Currently, challenges in quality improvement have driven various enterprises to create quality management systems in smart factories. The development of quality management systems enables quality control for reviewing product quality, identification, and eliminating product failures. However, process adjustment in quality control decisions may be hard to determine when failures are detected. To overcome this problem, an expert system (ES) that applies the failure mode and effects analysis (FMEA) method for developing quality control systems in brake disc production lines is considered. This quality control system concentrates on analyzing product defects that occur frequently in the production line and will lead to an improved performance of the braking system; the selected product defects are disc thickness variation (DTV), runout, and parallelism. This quality control system developed two modules, the designed FMEA (DFMEA) and component FMEA, which apply a rule-based algorithm for selecting actions. We propose the rules of configuration into the expert system code. The results indicate that the operator can carry out a quality control system with decision-making that can be supported by intelligent searching and reasoning in an expert system.
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Kang, Jaeyoung, and Sungjin Choi. "Brake dynamometer model predicting brake torque variation due to disc thickness variation." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 1 (January 2007): 49–55. http://dx.doi.org/10.1243/09544070jauto91.

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Gupta, Vandana, and S. B. Singh. "Creep Modeling in a Composite Rotating Disc with Thickness Variation in Presence of Residual Stress." International Journal of Mathematics and Mathematical Sciences 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/924921.

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Steady-state creep response in a rotating disc made of Al-SiC (particle) composite having linearly varying thickness has been carried out using isotropic/anisotropic Hoffman yield criterion and results are compared with those using von Mises yield criterion/Hill's criterion ignoring difference in yield stresses. The steady-state creep behavior has been described by Sherby's creep law. The material parameters characterizing difference in yield stresses have been used from the available experimental results in literature. Stress and strain rate distributions developed due to rotation have been calculated. It is concluded that the stress and strain distributions got affected from the thermal residual stress in an isotropic/anisotropic rotating disc, although the effect of residual stress on creep behavior in an anisotropic rotating disc is observed to be lower than those observed in an isotropic disc. Thus, the presence of residual stress in composite rotating disc with varying thickness needs attention for designing a disc.
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Yang, Shang, Hui Qun Yuan, and Yan Li. "Analysis on Mechanical Characteristics of Flexible Membranous Disc Coupling." Advanced Materials Research 655-657 (January 2013): 506–10. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.506.

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Using the basic finite element theory, 3D finite element models of flexible membranous disc coupling with different disc thickness is built by ANSYS ，and then the dynamic characteristics are analyzed in working conditions. In particular, the analysis of static stress and harmonic response to the thickness of 0.85 model is done for getting the stress variation under a rated condition. The date calculated by dynamic characteristics and stress analysis can satisfy the design requirements. Those researches and analysis provide a theoretical consideration for complex vibration situation of flexible membranous disc coupling and for the improvement and optimization of coupling product.
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Du, Xinyu, Lichao Mai, Hamed Kazemi, and Hossein Sadjadi. "Fault Detection and Isolation for Brake Rotor Thickness Variation." Annual Conference of the PHM Society 12, no. 1 (November 3, 2020): 8. http://dx.doi.org/10.36001/phmconf.2020.v12i1.1130.

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Brake rotors are critical parts of the disc braking system for modern vehicles. One common failure for brake rotors is the thickness variation, which may result in unpleasant brake pulsation, vehicle vibration during braking, or eventually lead to the malfunction of the braking system. In order to improve customer satisfaction, vehicle serviceability and availability, it is necessary to develop an onboard fault detection and isolation solution. In our previous work, the vibration features of master cylinder pressure, vehicle longitudinal acceleration and wheel speed were identified as fault signatures. Based on these fault signatures, a vibration- based fault detection and isolation algorithm is developed in this work. The difference of frequency response between the braking period and the normal driving period (non-braking) is employed to improve the algorithm robustness. The experiment results demonstrate the proposed algorithm can robustly diagnose the thickness variation fault and isolate the fault to each vehicle corner.
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Venkatachalam, R., and S. Balasivanandha Prabu. "An Experimental Investigation on the Vibration Responses of a Mild Steel Sandwich Shaft Disc System." Advanced Materials Research 584 (October 2012): 391–95. http://dx.doi.org/10.4028/www.scientific.net/amr.584.391.

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The main aim of this work is to identify the natural frequency of mild steel sandwich shaft disc system. An experimental evaluation is completed to evaluate the natural frequency and damping response of mild steel sandwich shaft disc system using Lab VIEW 8.5 software and National Instrument’s data acquisition (DAQ) system. The validation of the experimental results carried out using ANSYS 13.0, a finite element analysis software package. In addition, the effect of shaft thickness, disc thickness, shaft length variation, second, third, four and five systems also studied. The outcome of the results show that the increase in the parameter values have significant effect in the vibration responses of the mild steel sandwich shaft disc system which provide very much helpful information for the designers and researchers.
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Gupta, Vandana, and S. B. Singh. "Effect of anisotropy on creep behavior in a functionally graded material disc of variable thickness." International Journal of Computational Materials Science and Engineering 03, no. 03 (September 2014): 1450017. http://dx.doi.org/10.1142/s2047684114500171.

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In this paper, an effort has been made to study the effect of anisotropy on the steady state creep behavior in the functionally graded material disc with hyperbolic thickness made of Al - SiC (particle). The content of silicon carbide particles in the disc is assumed to decrease linearly from the inner to the outer radius of the disc. The creep behavior of the disc under stresses developing due to rotation at 15,000 rpm has been determined by Sherby's law. The creep parameters of the FGM disc vary along the radial distance due to varying composition and this variation has been estimated by regression fit of the available experimental data. The creep response of rotating disc is expressed by a threshold stress with value of stress exponent as 8. The study reveals that the anisotropy has a significant effect on the steady state creep response of rotating FGM disc. Thus, the care to introduce anisotropy should be taken for the safe design of the rotating FGM disc with hyperbolic thickness.
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Alexandrova, N. N., and P. M. M. Vila Real. "Elastic-plastic stress distributions and limit angular velocities in rotating hyperbolic annular discs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 2 (February 1, 2007): 137–42. http://dx.doi.org/10.1243/0954406jmes325.

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Plastic analytical stress analysis of a rotating annular disc with its contours being free from the radial pressure and with specifically variable thickness is presented in terms of the Mises-yield criterion and its associated flow rule. The hyperbolic form of thickness variation is considered and optimized towards the maximum rotational speed and favourable stress combinations. Radial and circumferential stress distributions in the disc both in the intermediate elastic-plastic and in the limit plastic states are obtained. As a particular case, limit elastic angular velocity parameter is derived. The influences of rotational speed as well as the disc's thickness profile on the plastic solution and size of elastic-plastic zone are demonstrated and discussed. The results obtained may be used for the correct implementation of numerical codes and preliminary engineering design.
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Dissertations / Theses on the topic "Disc Thickness Variation (DTV)"

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Rodriguez, Alexander John, and alex73@bigpond net au. "Experimental Analysis of Disc Thickness Variation Development in Motor Vehicle Brakes." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070209.123739.

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Over the past decade vehicle judder caused by Disc Thickness Variation (DTV) has become of major concern to automobile manufacturers worldwide. Judder is usually perceived by the driver as minor to severe vibrations transferred through the chassis during braking [1-9]. In this research, DTV is investigated via the use of a Smart Brake Pad (SBP). The SBP is a tool that will enable engineers to better understand the processes which occur in the harsh and confined environment that exists between the brake pad and disc whilst braking. It is also a tool that will enable engineers to better understand the causes of DTV and stick-slip the initiators of low and high frequency vibration in motor vehicle brakes. Furthermore, the technology can equally be used to solve many other still remaining mysteries in automotive, aerospace, rail or anywhere where two surfaces may come in contact. The SBP consists of sensors embedded into an automotive brake pad enabling it to measure pressure between the brake pad and disc whilst braking. The two sensor technologies investigated were Thick Film (TF) and Fibre Optic (FO) technologies. Each type was tested individually using a Material Testing System (MTS) at room and elevated temperatures. The chosen SBP was then successfully tested in simulated driving conditions. A preliminary mathematical model was developed and tested for the TF sensor and a novel Finite Element Analysis (FEA) model for the FO sensor. A new method called the Total Expected Error (TEE) method was also developed to simplify the sensor specification process to ensure consistent comparisons are made between sensors. Most importantly, our achievement will lead to improved comfort levels for the motorist.
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Conference papers on the topic "Disc Thickness Variation (DTV)"

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Ferrer, Bernat. "Disc Thickness Variation (DTV) Operational Measurement and Influence on the Overall Vehicle Roughness." In Brake Colloquium & Exhibition - 37th Annual. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-2110.

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Leslie, A. C. "Mathematical Model of Brake Caliper to Determine Brake Torque Variation Associated with Disc Thickness Variation (DTV) Input." In 22nd Annual Brake Colloquium & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-2777.

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Jacobsson, Helena. "Wheel Suspension Related Disc Brake Judder." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4165.

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Abstract Brake judder can be explained as a dynamical amplification of brake torque variation (BTV) when passing through a critical speed of a vehicle. The BTV arises owing to different geometrical defects e.g. disc thickness variation (DTV), disc runout and dynamical effects. DTV is usually the most important source of these fluctuations. Measurements have been made on a passenger car with heavy DTV on one of its front brakes. The eigen frequency of the wheel suspension was found to be 14 Hz, corresponding to a first order critical speed of 95 km/h. These measurements qualitatively verify the brake model with a maximum caliper vibration amplitude close to 100 km/h followed by a slowly decreasing amplitude.
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Edmonds, David E., James B. Malosh, and Tim Yoko. "Disc Thickness Variation Generation: Dependence on Presence of Road Vibration." In SAE 2005 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-2318.

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Okamura, Toshikazu, and Masanori Imasaki. "A Study on Relationship Between Disc Thickness Variation and Casting Material Properties." In 21st Annual Brake Colloquium & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-3347.

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Bhansali, Pratik S., and Srinath V. Ekkad. "Effect of Variation of Pin-fin Height on Jet Impingement Heat Transfer on a Rotating Surface." In ASME 2021 Heat Transfer Summer Conference collocated with the ASME 2021 15th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ht2021-63946.

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Abstract Heat transfer over rotating surfaces is of particular interest in rotating machinery such as gas turbine engines. The rotation of the gas turbine disc creates a radially outward flow on the disc surface, which may lead to ingress of hot gases into the narrow cavity between the disc and the stator. Impingement of cooling jet is an effective way of cooling the disc and countering the ingress of the hot gases. Present study focusses on investigating the effect of introducing pin-fins over the rotating disc on the heat transfer. The jet Reynolds number has been varied from 5000 to 18000, and the rotating Reynolds number has been varied from 5487 to 12803 for an aluminum disc of thickness 6.35mm and diameter 10.16 cm, over which square pins have been arranged in an inline fashion. Steady state temperature measurements have been taken using thermocouples embedded in the disc close to the target surface, and area average Nusselt number has been calculated. The effects of varying the height of the pin-fins, distance between nozzle and the disc surface and the inclination of the impinging jet with the axis of rotation have also been studied. The results have been compared with those for a smooth aluminum disc of equal dimensions and without any pin-fins. The average Nusselt number is significantly enhanced by the presence of pin fins. In the impingement dominant regime, where the effect of disc rotation is minimal for a smooth disc, the heat transfer increases with rotational speed in case of pin fins. The effect of inclination angle of the impinging jet is insignificant in the range explored in this paper (0° to 20°).
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Hofwing, M. "Robustness of Residual Stresses in Brake Discs by Metamodeling." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47437.

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During casting residual stresses are developed due to the solidification and cooling. In this work the robustness of residual stresses in casted brake discs with respect to variations in four parameters is evaluated. The parameters are Young’s modulus, yield strength and hardening, time of breaking the mould and the thickness of the brake disc. The robustness analysis is performed by Monte Carlo simulations of metamodels which are surrogates to a finite element model. Quadratic response surfaces and Kriging approximations are considered. Those are based on finite element analyses defined by a Latin hypercube sampled design of experiments. In the finite element analyses an un-coupled approach is utilized where a thermal analysis generates a temperature history of the solidification and cooling. Then follows a structural analysis which is driven by the temperature history. After casting the machining of the brake disc is analyzed by gradually removing elements in the finite element model. The results show that the variation in the studied parameters yield large variation in residual stresses. The thickness of the brake disc is the parameter that has largest influence to the variation in residual stresses. Furthermore, the level of the residual stresses are in general high and might influence the fatigue life of the brake disc.
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Yoshida, Kenji, Tomoya Adachi, Isao Kataoka, Hiroyuki Horiki, Akira Yoneya, Toshimitsu Kaji, and Kiyoshi Horii. "Hydrodynamic Behavior of Swirling Liquid Film Flow on Rotating Disc." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45184.

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Experimental and analytical studies have been carried out on the hydrodynamic behavior of swirling liquid film flow on a rotating disc. Film flow formation and swirling waves on the liquid film were analyzed through observation using high speed video. Liquid film thickness was measured using the Laser refraction method and compared with prediction. The rotating disc is 200 mm in diameter and was made of Silicon (Silicon wafer in industrial use). The rotating speed is up to 100 rad/sec (2000 rotations per min.) Water is supplied to the center of the disc at a flow rate of 8.3 × 10−6 m3/s (500 cc/min). The film flow is divided into three regimes depending upon rotating speed. For the lower rotating speed (up to 10 rad/sec), formation of liquid film flow is incomplete and some part of the peripheral region of the disc is not completely covered by liquid film. For the intermediate rotating speed (15–25 rad/sec), laminar film flow covered the whole disc. Furthermore, there are swirling waves on the liquid film. This wave is considered to be a continuity wave arising at the center portion of disc due to the water flow rate variation form the nozzle. Wave propagation speed and behavior of these swirling waves were well explained by the theory of continuity wave. For the high rotating speed (more than 30 rad/sec), the liquid film flow changed its flow regime from laminar flow to turbulent flow. The estimated film Reynolds number at transition is about 1200 which is consistent with turbulent flow transition for pipe flow and film flow on non-rotating surface. Three dimensional turbulent waves were observed on this turbulent liquid film. The behavior of such three dimensional turbulent waves were quite random in time and space. Measured film thicknesses ranged from 50 to 300 micron. Film thickness and its fluctuation decreased as the rotation speed of disc increased and distance from disc center increased. The analysis was made on the film thickness based on the force balance between shear stress and centrifugal force acting on the film. The predicted film thickness agreed well with the measured value.
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Basavarajappa, Manjunath, and Sanja Miskovic. "Numerical Study of Single Phase Liquid Mixing in Stirred Tanks Fitted With Rushton Turbine and Flotation Impeller." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65277.

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Mixing is a complex process and usually involves continuous reduction of length and time scales associated with fluid(s) being mixed. Mixing is an essential process and finds widespread application in a range of industries. Due to lack of understanding of the mixing process, industries lose a significant amount of money contributed by increased power consumption and longer process times. In this work a thorough comparison of flow, mixing, and turbulence characteristics of Rushton turbine (RT) and a flotation impeller, variation of disc turbine, is performed for single phase flows using Computational Fluid Dynamics (CFD). The fluid used is water. Base case validation and model verification is performed by comparing our CFD results with widely accepted Laser Doppler Anemometry (LDA) experimental results for the Rushton Turbine. Multiple reference frame (MRF) technique, a pseudo-steady modeling method, is used to model the impeller motion on flow characteristics at different Reynolds numbers (Re). Turbulence closure is provided using RANS based two equation realizable k-ε turbulence model. Grid independence studies are carried out a sufficiently fine grid is selected to capture the fine flow structures close to the impeller, though radial velocity close to impeller was under-predicted compared to experimental results. Effects of finite impeller blade and disc thicknesses on the local flow field, which are commonly modeled as thin surfaces, are explored. Various tank geometric variations, like different impeller clearances, and impeller diameter to tank diameter ratios (DI/DT), are also investigated. The numerical results will help in understanding the effect of impeller design on local and bulk flow characteristics and turbulence anisotropy close to the impeller. The results from this work will direct the tank and impeller design choices for two phase solid-liquid flows for future investigations.
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Baisie, Emmanuel A., Z. C. Li, and X. H. Zhang. "Simulation of Diamond Disc Conditioning in Chemical Mechanical Polishing: Effects of Conditioning Parameters on Pad Surface Shape." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34264.

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Diamond disc conditioning is traditionally employed to restore pad planarity and surface roughness in chemical mechanical polishing (CMP). In this paper, a mathematic model is developed by using a surface element method to simulate and predict the pad surface shape resulted from diamond disc conditioning. The developed model is then validated by published experimental data. Three metrics (total thickness variation (TTV), bow and non-uniformity (NU)) are defined and utilized to evaluate the pad surface shape. Based upon the validated model, effects of conditioning parameters (including sweeping profile, pad rotating speed, conditioner rotating speed, and conditioner diameter) on the pad surface shape are further investigated and discussed.
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