Reliability Analysis and Optimization for the Brake Drum

In order to research the static and dynamic characteristics of drum brake in the braking process and avoid resonance, it is necessary to carry out static analysis and modal analysis of drum brake. By establishing the three-dimensional model of the brake drum and imported to ANSYS for static analysis, the maximum equivalent stress and maximum deformation of the brake drum are obtained. The first, second and third natural frequencies and modal vibration shapes of the brake drum are obtained by modal analysis. Four dimensional parameters are selected as design variables, and the sensitivity is carried out by using experimental design. Taking the maximum deformation, first natural frequency, second natural frequency and mass of the brake drum as the objective function, the multi-objective optimization algorithm is used to optimize the design variables. Based on the optimization design, the six sigma reliability analysis of the brake drum is carried out, and the six sigma reliability analysis method is given in detail. The cumulative distribution graph of the maximum deformation, first natural frequency, second natural frequency and mass of the brake drum are obtained. The analysis results show that the reliability of the brake drum is close to 100%, and then it is judged that the brake drum has high reliability. The research results provide a reference basis for structural reliability analysis.

Nilai Perlambatan Dan Uji Ketegangan Disch Brake Pada Sistem Pengereman (Gokart 7,5 Hp)

Setiap kendaraan baik kendaraan yang kita pakai sehari hari sampai ke kendaraan sport untuk balapan di lintasan akan dilengkapi dengan system Pengereman. Pengereman merupakan salah satu piranti penting dalam sebuah kendaraan bermotor baik Roda dua maupun roda empat dan seterusnya. Secara sederhana Fungsi dari pengereman untuk mengurangi laju kendaraan dari kecepatan tinggi ke rendah dan sampai benar-benar berhenti. Dalam system pengereman dibagai menjadi 2 yaitu Disch brake dan Drum brake yang membedakan keduanya terletak pada cara kerjanya dan jenis komponenaya. Metode yang digunakan dalam penelitian ini adalah menggunakan metode secara langsung yaitu mulai mempersiapkan alat dan bahan serta melakukan pengujian secara langsung yaitu pemasangan pengeraman Disch brake pada Gokart Daiho 7,5 Hp yang peletakanya dilakukan pada poros belakang dengan menghitung centroid/titik tengah sehingga didapatkan balancing yang sesuai. Dalam penelitian ini akan menganalisa aplikasi nilai perlambatan pengereman Disch brake pada Gokart Daiho 7,5 Hp dengan beberapa variasi kecepatan awal yang berbeda yitu dimulai dari nilai kecepatan terkecil 20,30,40,50,60 dengan nilai perlambatan pengereman adalah 80,75,94,11,125 dan 150m/dtk dengan waktu pengereman 0,25. 0,4. 0,425.0,4.0,4 dan 0,4. Dengan efisiensi pengereman sebesar 13,58% dengan nilai tegangan pengereman sebesar 0,26m². dari hasil nilai tersebut maka bisa ditarik kesimpulan bahwa semakin tinggi nilai kecapatan kendaraan maka juga akan semakin lama waktu yng digunakan untuk memberhrntikan kendaraan tersebut dan jarak pengeremanpun juga akan semakin panjang.

The Application Design of an Improved PLC Linked Network Communication in the Production Line

This paper mainly introduces an improved PLC communication program based on PLC link network communication. Read and write corresponding production data at different time periods through the shared link area, and use link location soft elements as interactive handshake signal. The main station download module and slave station upload module are designed to complete the large range of data transmission interaction between master and slave stations, and the control system is realized in the automatic production line for drum brake pad processing.

Light duty automotive drum brake squeal analysis using the finite-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.

Variation in vibro-acoustic noise due to the defects in an automotive drum brake

Drum brakes are significant contributors to noise and vibration in automobiles causing discomfort to the passengers. The vibration and hence the resulting noise increase due to various inherent defects in the drum brake, such as asymmetry. This work aims to quantify the variation in the vibro-acoustic noise due to several common defects in the drum brake using an integrated non-linear vibration analytical model and a numerical acoustic model. The sources of vibro-acoustic noise sources such as contact and reaction forces are predicted using a four-degree-of-freedom non-linear contact mechanics based analytical model. A finite element based acoustic model of the drum brake is utilized to predict the force to the sound pressure transfer function in the drum brake. Product of the transfer functions and the forces gives the corresponding sound pressure level from which the overall sound pressure levels are estimated. The variation in the overall sound pressure levels due to different drum brake defects is evaluated by introducing defects to the analytical model. The results show that the overall sound pressure level is a strong function of the defects. It is envisioned that the current work will help in the development of effective health monitoring systems.

Wear analysis of eco-friendly non-asbestos friction-lining material applied in an automotive drum brake: Experimental and finite-element analysis

Brake friction lining material is the critical element of a braking system, since it provides friction resistance to the rotating drum for controlling automobiles. The present study involves wear analysis of newly developed eco-friendly non-asbestos friction lining material for automotive drum brake applications using experimental study, finite-element analysis, and microstructural investigations. Theoretical interpretation of braking force at different automobile speeds was derived using fundamentals. Specimen drum brake liner with eco-friendly material compositions was produced using an industrial hot compression molding process at one of the manufacturer. The surface wear of the liner was measured using an effective and accurate method. Furthermore, a finite-element analysis model was developed considering actual operating conditions and various components of the drum brake system. The model was elaborated for various result outcomes, including Von-Mises stresses and total deformation of components of the drum brake, and further used to estimate the surface wear of the friction lining material in terms of transverse directional deformation. Finally, microstructural analysis of the friction lining material was carried out using scanning electron microscopy and energy dispersive spectroscopy. From the results, it is seen that the developed friction lining material is wear resistant. The finite-element analysis model can be effectively utilized to study the tribological characteristics of friction lining materials.