Light duty automotive drum brake squeal analysis using the finite-element method

2021 ◽  
pp. 146442072110359
Author(s):  
Anderson L Dias ◽  
Rômulo do N Rodrigues ◽  
Roberto de A Bezerra ◽  
Pierre Lamary ◽  
Matheus HP Miranda
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Friction Coefficient ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Brake Squeal ◽  
Positive Real ◽  
Drum Brake ◽  
Light Duty ◽  
Element Method

The method presented in this work intends to analyze drum brake design parameters of a light duty automotive drum brake system. The main objective of this work is to correlate brake materials and unstability parameters to identify which condition will effectively reduce squeal propensity. The methodology involves (a) the finite-element method of the brake components, namely, drum, shoes, and frictional linings, (b) static calculations to get a pre-stress state around which (c) is computed the complex eigenvalues of the system. Hence, positive real parts indicate dynamic instabilities which are explored by varying parameters, namely, the modulus of elasticity of the materials and the friction coefficient at the contact of the shoes with the drum. According to calculations, it was observed that there exist a given range of values for Young’s modulus and friction coefficient that are favorable to reduce drum brake squeal occurrence. In addition, the method proposed delivered results that match with brake squeal literature.

Heavy Duty Automotive Drum Brake Squeal Analysis Using the Finite Element Method

2021 ◽  
Author(s):  
Anderson Luiz Dias ◽  
Rômulo do Nascimento Rodrigues ◽  
Roberto de Araújo Bezerra ◽  
Pierre Lamary
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
The Finite Element Method ◽  
Heavy Duty ◽  
Brake Squeal ◽  
Drum Brake ◽  
Element Method

scholarly journals Influence of specific weight and wall friction coefficient on normal pressures in silos using the Finite Element Method

2021 ◽  
Vol 29 ◽  
pp. 192-203
Author(s):  
Rômulo Marçal Gandia ◽  
Francisco Carlos Gomes ◽  
Wisner Coimbra de Paula ◽  
Pedro José Rodriguez Aguado
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Friction Coefficient ◽  
Static Condition ◽  
Normal Pressure ◽  
Specific Weight ◽  
Experimental Models ◽  
Wall Friction ◽  
The Finite Element Method ◽  
Element Method

The objective of this work was to develop models using the Finite Element Method (FEM) to assess the maximum normal pressures in the static condition in silos using different wall friction coefficient and specific weight of the stored product compared to the pressures obtained by the Eurocode 1, part 4. The geometries of the silos models were developed based on the dimensions of the experimental station at the Universidad de Leon (Spain). The material properties were obtained by Jenike shear cell tests and were used to generate the models by the MEF. 3D models were generated varying the friction coefficient (0.2, 0.4, and 0.6) and the specific weight (6; 7.5 and 9 kN / m3). It was verified that the models by FEM follow the theory of pressures in silos: normal pressures increase due to the increase in specific weight and decrease due to the increase in the friction coefficient. Moreover, the maximum normal pressure occurs at the hopper silo transition. The experimental pressures (FEM models) compared with Eurocode 1, part 4 allowed to validate the models developed, presenting trends of similar values to those found by the MEF. The experimental models demonstrated that the influence of the wall friction coefficient and specific weight significantly interferes with the pressures in slender silos.

Engineering Calculations of Microelectronic Products Parts and Assemblies Using Finite-Element Modeling

2021 ◽  
Vol 26 (3-4) ◽  
pp. 255-264
Author(s):  
E.Y. Chugunov ◽  
◽  
A.I. Pogalov ◽  
S.P. Timoshenkov ◽  
◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Material Properties ◽  
Integrated Approach ◽  
Design And Technology ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Operational Factors ◽  
The Impact ◽  
Element Method

In the context of increasing the electronic components integration level, growing functionality and packaging density, as well as reducing the electronics weight and size, an integrated approach to engineering calculations of parts and assemblies of modern functionally and technically complex microelectronic products is required. Of particular importance are engineering calculations and structural modeling using computer-aided engineering systems, and also assessment of structural, technological and operational factors’ impact on the products reliability and performance. This work presents an approach to engineering calculations and microelectronic products modeling based on the finite-element method providing a comprehensive account of various factors (material properties, external loading, temperature fields, and other parameters) impact on the stress-strain state, mechanical strength, thermal condition, and other characteristics of products. On the example of parts and assemblies of products of microelectronic technology, the approximation of structures was shown and computer finite-element models were developed to study various structural and technological options of products and the effects on them. Engineering calculations and modeling of parts and assemblies were performed, taking into account the impact of material properties, design parameters and external influences on the products’ characteristics. Scientific and technical recommendations for structure optimization and design and technology solutions ensuring the products resistance to diverse effects were developed. It has been shown that an integrated approach to engineering calculations and microelectronic products modeling based on the finite-element method provides for the determination of optimal solutions taking into account structural, technological, and operational factors and allows the development of products with high tactical, technical and operational characteristics.

Vibration characteristics of steering columns with bellows

2001 ◽  
Vol 215 (2) ◽  
pp. 171-178
Author(s):  
K H Kim ◽  
G H Han ◽  
H K Kim
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimal Design ◽  
Vibration Characteristics ◽  
Sensitivity Analyses ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Negative Effects ◽  
Vibration Sensitivity ◽  
Element Method

Bellows can be used as collapse elements for automotive steering columns. The crash performance of the steering column can be significantly improved with the bellows. However, the bending flexibility of the bellows has negative effects on the vibration characteristics. An effort is made to improve the vibration characteristics of steering columns with bellows. To understand the effects of various design parameters on the collapse and vibration, sensitivity analyses are performed by the finite element method using Taguchi's scheme. It is shown that the structure of the upper mounting bracket is the most important parameter affecting the vibration characteristics. An optimal design is proposed for a lower tilt type steering column.

Suppression of drum brake squeal through structural modifications using finite element method

2009 ◽  
Vol 51 (1/2) ◽  
pp. 3 ◽  
Author(s):  
Abd Rahim Abu Bakar ◽  
Mohd Reaza Buang ◽  
Mohd Zam Abdul Rashid ◽  
Roslan Abdul Rahman
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Brake Squeal ◽  
Structural Modifications ◽  
Drum Brake ◽  
Element Method

Constructing the Predictive Models of Friction Coefficient Using Cylindrical Compression Testing

2006 ◽  
Vol 505-507 ◽  
pp. 745-750 ◽  
Author(s):  
Yuan Chuan Hsu ◽  
Tung Sheng Yang ◽  
S.Y. Sung ◽  
Sheng Yi Chang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Friction Coefficient ◽  
Analysis Data ◽  
Compression Testing ◽  
Strain Hardening Exponent ◽  
The Finite Element Method ◽  
Element Analysis ◽  
The Relationship ◽  
Element Method

In this study, the predictive model of friction coefficient using cylindrical compression was constructed through combining the finite element method and neutral networks. Namely, the related data of the materials characters, cylinder compression bulging, and how they were associated with friction coefficient was obtained by the finite element method. Based on those analysis data, the relationship model, reflecting the relationship among the materials characters such as strength coefficient and strain-hardening exponent, the compression bulging such as reduction height, expanding in upper ending, expanding in bottom ending, maximum expanding in outside diameter and the friction coefficient in workpiece/die interface, was constructed. Finally, the cross verification between finite element analysis, prediction by neutral network model and the experiments of cylindrical compression testing and ring compression testing are repeatedly checked to ensure the accuracy and reliability of the constructed model. Results of the current study indicate that their errors are extremely limited, and the developed predictive system is reliable and feasible.

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