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Vehicles need to brake frequently on long downhill sections. In this case, the surface of the friction lining is prone to accumulating a large amount of heat, which will reduce the performance of the braking material and lead to braking failure. This article analyzes the heat generation and dissipation mechanism during the braking process of drum brakes based on the law of energy conservation, and establishes a thermal conductivity differential equation. Subsequently, with the honeycomb texture as the biomimetic target, circular, square, and honeycomb patterns with different parameters were designed on the surface of the friction lining, and a finite element model was established using Ansys Workbench. Thermodynamic coupling analysis shows that patterned friction lining can reduce the maximum temperature of the braking surface. Honeycomb patterns have better heat dissipation effects than circular and square patterns. Compared with non patterned brake pads, honeycomb patterns can reduce the maximum surface temperature of brake pads by 14.6%. When the surface area ratio of the honeycomb is 56.8%, its heat dissipation effect is the best.

In order to understand the safety status of traction drive elevator brake, taking the most common drum brake as the research object, several common failure forms of drum brake and the problems found in brake disassembly are summarized and sorted out. Based on the analysis of failure causes, suggestions on the use and maintenance of elevator brakes are put forward, and the in-service elevator brakes which have been used for a certain period of time are tested, and the performance characteristics of the in-service elevator brakes are analyzed, which provides a basis for the promotion of hidden trouble investigation and rectification of elevator brakes.

When a truck makes emergency braking while driving on a slope, the transient impact force generated can easily cause personal injury to passengers and damage the vehicle’s braking system. In order to study the working state of the brake under this working condition, the ANSYS finite element thermal-solid coupling transient analysis method was used to establish the mechanical model and finite element model of the vehicle and brake under the slope emergency braking state, showing the temperature field and stress field distribution rules and interactions of the drum brake under this working condition, and compared with the flat road emergency braking condition. The results show that the maximum temperature of the brake reaches 184.26°C during emergency braking, and the stress field and temperature field are strongly coupled in two directions, which can easily lead to uneven wear of the linings and a reduction in the fatigue life of the brake.

This study examined the dynamic instability of a drum brake induced by the rigid modes of the brake shoe. The brake shoe was modeled as a rigid curved plate subject to frictional contact with a rotating drum. In the presence of a negatively sloped friction curve, dynamic instability was numerically analyzed with respect to variation in the system parameters. The results showed that mode-coupling instability did not occur, but dynamic instability was induced by negative damping in a specific rigid mode, and its propensity varied with the operating conditions and geometric changes.

Electromechanically actuated drum brakes are one interesting option for the realization of brake-by-wire systems for future electric vehicles. A key characteristic for the design and control of electromechanical brake actuators is the actuation point stiffness, as this quantity relates the actuation force to the required actuator position. The various known approaches for the control of electromechanical brakes, which primarily focus on disc foundation brakes, typically rely on the stiffness curve at least to some extent. A transfer of these approaches to drum brakes is not straightforward, because the actuation point stiffness for drum brakes is much more complex compared to disc brakes. In particular, a strong hysteretic behavior is observed for the standing drum and a considerable change of the stiffness and hysteresis can be observed for the rotating drum. Although drum brakes have been used for decades these effects have not been thoroughly discussed in literature, yet. Hence, this article proposes a minimal model, which gives a fundamental understanding of the stiffness characteristics of drum brakes. The relation to measured stiffness curves is discussed in detail to provide an in-depth understanding of the drum brake behavior. Additionally, prospect is given to a reduced complexity model that is suitable for online identification and control.

The particle emission characteristics of a drum brake under different braking cycles and braking conditions are studied based on the inertia test bench, brake sealing chamber, and particle test equipment. The results show that a large number of particles are generated during the braking process, and the number of solid particles at a nominal particle size of approximately 10 nm electrical mobility diameter and larger (SPN 10 ) emission factor can reach 8.927×10 9 #/km under different braking cycles. With the increase of initial braking speed, initial braking temperature, and vehicle load, the brake wear particulate generated in the braking process increases. The total brake wear particulate number emission has a quadratic function relationship with the initial braking speed and a linear relationship with the initial braking temperature. Brake deceleration has little effect on total brake wear particulate number emissions produced in one brake process.

Some important indicators in the braking system performance on a motorcycle are the braking temperature and stopping distance. High temperatures due to frictional heat in the drum brake can decrease the braking force and cause a slip. To improve braking performance, an effective strategy is needed to reduce the drum temperature and shorten the stopping distance. This study aims to analyze the effect of cooling grooves on the standard brake drum to decrease the drum brake temperature and the length of stopping distance. The measurements were compared to the standard drum brake as a reference, and two types of the modified ones to increase the braking performance by adding the slant-grooved and a straight grooved on brake drum. Braking is performed by providing a compressive load of two kg on the brake pedal for three cases of motorbike speed: 20, 40, and 60 km/hour. The results show that the brake drum with straight cooling grooves provides better braking performance compared to other drum brakes. For a speed of 60 km/h, the temperature of the straight grooved brake is 3.5 ºC. The stopping distance is 29.1 % shorter compared to the standard one. It shows that adding cooling grooves on drum brake can increase the effectiveness of motorcycle braking performance at various speeds. The results show that the brake drum with straight cooling grooves provides better braking performance compared to other drum brakes

Because of the need for safety, braking performance has become a very important factor for automotive manufacturers and passengers. Despite all the stresses experienced by the drum brake doesn’t damage the drum due to high tensile strength but the drum may fail under fatigue loading. The critical region of concentrated stress is determined, and appropriate modifications are being made to improve it. The distribution of stress and the heat dissipation obtained from the result of the analysis are employed as input for the failure region. The findings of stress and thermal analysis are crucial for improving the component design at the first stage of development. The objectives of this study are to modify and improve the circumferential strength and heat dissipation and to optimize the design of the drum brake with simulation using Finite Element Analysis. The simulation was run on the initial model and modified on its to make it better. it shows that 27.33% decrease in maximum von Mises stress. Thermal analysis for heat flux on the material will show the ability of heat dissipation. Overall, It has been determined that aluminium alloy is the optimum material for drum brake design in terms of total heat flux.

Both drum brakes and disc brakes have their own structural limitations and advantages. As a new type of industrial brake, cone brake combines the advantages of electric hydraulic drum brake and electric hydraulic disc brake, makes up for the shortcomings of drum brake and disc brake, and greatly improves the service performance and safety performance of the brake. This paper introduces the structure composition and working principle of the conical surface brake, analyzes the advantages of the conical surface brake through the comparison with the drum brake, carries out experimental research, analyzes the test results, gives optimization suggestions for the existing shortcomings, and explores the application prospect of the new brake combined with the introduction of application examples. This paper provides a reference for the technical innovation of brake and a new choice for brake users.

In order to reduce the influence of random parameters uncertainty on the safety performance of the vehicles, the Reliability-Based Robust Optimization Design (RBROD) is conducted on a drum brake under multiple failure modes, and a more effective and accurate method is found for the braking system robust design. The design of experiment method is used to obtain the 400 sample data sets between the design parameters and the natural frequency of drum brake, and the accuracy of the established model is verified by experiment. Taking the brake’s weight and the Euclidean norm of the reliability sensitivity as optimization objectives, and the range of design parameters and system reliability as constraints, the RBROD mathematical model is established. RBROD is conducted by four meta-model methods, and the results are verified by finite element analysis. The research results show that the drum brake after RBROD meets the requirements of reliability, robustness, and optimization design, and the adaptive Kriging method has the highest calculation accuracy and efficiency among the four meta-model methods.