On Hydraulic Brake System Using Bench Experiments for Off-Road Vehicles

2012 ◽  
Vol 588-589 ◽  
pp. 327-330
Author(s):  
Fang Zhao ◽  
Mu Yi Lin ◽  
Zhun Wang
Keyword(s):  
Dynamic Characteristics ◽  
Calculated Data ◽  
Operating Conditions ◽  
Brake System ◽  
Design Parameters ◽  
Road Vehicles ◽  
Construction Machinery ◽  
Hydraulic Brake ◽  
Full Power ◽  
Actuation Systems

The full power hydraulic brake system has several advantages over traditional brake actuation systems. These systems are capable of supplying fluid to a range of very small and large volume service brakes with actuation that is faster than air/hydraulic brake systems. Implementation of full power hydraulic brake system in off-road vehicles calls for good understanding of its dynamic characteristics. In this paper, we consider the problem of dynamic modeling of the brake system and develop a dynamic model for a hydraulic brake valve. First, the dynamic characteristics of full power hydraulic brake system are analyzed theoretically. The effects of varying design parameters (brake valve, accumulator and so on) and the different operating conditions are then analyzed. Second, we investigate the dynamic characteristics of a full power hydraulic brake system using a test bench, which is a loader brake system specifically designed for one construction Machinery Company. Finally, based on the experimental results, the mathematical models are amended and verified. The result shows that the model-calculated data agree well with tested data. The dynamic behavior of hydraulic valve can be well predicted with the model. The simplified models can be applied to the studies of full power hydraulic brake system dynamics.

Effect of structural design parameters on nonlinear dynamic characteristics of the gear transmission

2021 ◽  
pp. 095440702110294
Author(s):  
Tiancheng Ouyang ◽  
Rui Yang ◽  
Yudong Shen ◽  
Jingxian Chen ◽  
Nan Chen
Keyword(s):  
Dynamic Characteristics ◽  
Nonlinear Dynamic ◽  
High Speed ◽  
Gear Tooth ◽  
Spur Gear ◽  
Operating Conditions ◽  
Design Parameters ◽  
Meshing Stiffness ◽  
Nonlinear Dynamic Characteristics ◽  
Potential Energy Method

The calculation of time-varying meshing stiffness caused by the alternate contacting of the gear tooth is an essential prerequisite to obtain real and effective nonlinear dynamic characteristics of the transmission system, so that the significance of which cannot be overemphasized. Accordingly, this work proposes an improved method to get meshing stiffness with taking fillet-foundation and gear rim deflection into consideration. Compared to the traditional potential energy method, the proposed method has more superior accuracy and performance, and its effectiveness has been further verified by the finite element analytical model. After that, an ideal eight degree of freedoms (DOFs) dynamic model of one stage mass-spring-damper involute spur gear, including lateral and torsional motions, is established to study the dynamic characteristics. Due to the complexity of the gear system operating conditions, we also investigate the influence of various parameters including hub bore radius, transmitting load, and rotation speed on dynamic features, especially in heavy-load and high-speed conditions. From the results, it can be concluded that these parameters will play a prominent role in the spur gear pair dynamic behaviors, providing a certain guidance for gear design.

Full Power Hydraulic Brake Actuation System for Motor Vehicles

1973 ◽  
Vol 187 (1) ◽  
pp. 141-148
Author(s):  
A. C. Firth ◽  
D. Parsons
Keyword(s):  
Power System ◽  
Detailed Analysis ◽  
Motor Vehicles ◽  
Design Parameters ◽  
Hydraulic Brake ◽  
Actuation System ◽  
Hydraulically Actuated ◽  
Full Power ◽  
Basic Philosophy

The vast majority of motor vehicles have had for some 30 years hydraulically actuated wheel brakes of the fixed displacement type. This paper describes the limitations of such a system and the justification for going to the more advanced full-power system that is at present offered on a limited number of vehicles. Once the decision to adopt a full-power system is taken, a considerable new potential is available to the vehicle designer. The basic philosophy and design parameters of a power system are described at length and detailed analysis is made of the several component unit designs.

Dynamic Structural Properties of Compliant Foil Thrust Bearings—Comparison Between Experimental and Theoretical Results

1994 ◽  
Vol 116 (1) ◽  
pp. 70-75 ◽  
Author(s):  
C.-P. Roger Ku
Keyword(s):  
Dynamic Characteristics ◽  
High Performance ◽  
Operating Conditions ◽  
Design Parameters ◽  
Static Loads ◽  
Thrust Bearings ◽  
Equivalent Damping ◽  
Foil Bearings ◽  
Compliant Surface ◽  
Wide Range

This paper describes an experimental investigation into the dynamic characteristics of corrugated foil (bump foil) strips used in compliant surface foil thrust bearings. This study provided the first opportunity to quantify the dynamic structural stiffness and equivalent damping coefficients of bump foil strips for a wide range of operating conditions. The experimental data were compared to results obtained by a theoretical model developed earlier. The effects of bearing design parameters, such as static loads, dynamic displacement amplitudes, bump configurations, pivot locations, surface coatings, and lubricant were also evaluated. An understanding of the dynamic characteristics of bump foil strips resulting from this work offers designers a means for enhancing the design of high-performance compliant foil bearings.

Full Power Hydraulic Brake Actuation System for Motor Vehicles

1973 ◽  
Vol 187 (1) ◽  
pp. 141-148
Author(s):  
A. C. Firth ◽  
D. Parsons
Keyword(s):  
Power System ◽  
Detailed Analysis ◽  
Motor Vehicles ◽  
Design Parameters ◽  
Hydraulic Brake ◽  
Actuation System ◽  
Hydraulically Actuated ◽  
Full Power ◽  
Basic Philosophy

The vast majority of motor vehicles have had for some 30 years hydraulically actuated wheel brakes of the fixed displacement type. This paper describes the limitations of such a system and the justification for going to the more advanced full-power system that is at present offered on a limited number of vehicles. Once the decision to adopt a full-power system is taken, a considerable new potential is available to the vehicle designer. The basic philosophy and design parameters of a power system are described at length and detailed analysis is made of the several component unit designs.

scholarly journals OSCILLATIONS OF LAYED STRUCTURES WITH CONSOLIDATED MECHANICAL CHARACTERISTICS

2021 ◽  
pp. 1-3
Author(s):  
Сергій Трубачев ◽  
Валерій Колодежний ◽  
Владислав Петрик ◽  
Анатолій Сіренко
Keyword(s):  
Composite Materials ◽  
Dynamic Characteristics ◽  
Mechanical Characteristics ◽  
Layered Structures ◽  
Operating Conditions ◽  
Forced Oscillations ◽  
Design Parameters ◽  
The Real ◽  
Urgent Task ◽  
Vibration Loads

Modern industry requires the creation and use of materials and structures with improved performance. Such structures include layered structures made of com-posite materials. Layered systems made of high-strength composite materials with different layers have found wide application in aviation technology as elements of the bearing surfaces of aircraft, as well as in many other industries. The use of composite plates in loaded structures is one way to improve the weight characteristics of rocket and space technology. Also layered structural elements are widely used in transport engineering, used in construction practice. Multilayer systems in the conditions of bending deformation are the most rational in terms of strength and rigidity. Thus, the improvement of methods for calculating inhomogeneous layered structures is an urgent task. Along with the methods of non-destructive testing, defectoscopy of structures using hardware methods, analytical research methods remain relevant, which allow to predict the possible destruction of the structure. When designing equipment, it is necessary to take into account the real operating conditions of structures. In the process, the mechanisms work under the action of vibration loads, so determining the dynamic characteristics of structures is an urgent task. This determines the need to study the oscillating processes taking into account the real conditions of vibration load, which will determine the optimal design parameters and modes of operation of the machine with the maximum distance from critical modes that are dangerous. One of the reasons for the destruction of elements of machine-building structures is that they resonate. Therefore, the problem of forced oscillations needs to be solved. To solve this problem, it is necessary to determine the natural frequencies and their corresponding natural forms of oscillations. The paper presents a method of calculating a layered structure to determine the physical characteristics for the whole package, taking into account the physical and mechanical characteristics of each of the layers. This approach allows to determine the dynamic characteristics and stress-strain state of multilayer composite structures, using classical equations for homogeneous struc-tures. This approach greatly simplifies the equation and allows you to find a solution that can be used in the design of structures made of composite materials under vibration loads.

Exploring Magnetorheological Brake-Based Anti-Lock Brake System for Automotive Application

2019 ◽  
Vol 9 (4) ◽  
pp. 17-43
Author(s):  
Romit Kamble ◽  
Satyajit Patil
Keyword(s):  
Fuzzy Controller ◽  
Stopping Time ◽  
Brake System ◽  
Automotive Application ◽  
Quick Response ◽  
Road Vehicles ◽  
Braking Performance ◽  
Stopping Distance ◽  
Hydraulic Brake ◽  
The Stability

The present work explores a magnetorheological brake (MRB)-based anti-lock brake system (ABS) proposed for a vehicular application. Because of its quick response time, MRB is being considered as a substitute for the conventional hydraulic brake (CHB), commonly used for road vehicles. ABS is used along with CHB to prevent wheel lockup due to severe braking and thereby maintain the stability of the vehicle. This work envisages ABS for a vehicle using MRB instead of CHB. The braking maneuver for a typical mid-size car with and without ABS is simulated in a MATLAB environment. Both versions, a CHB-based ABS and a MRB-based ABS are considered in simulations. The braking performance in terms of stopping time and stopping distance is estimated. A PID and a Fuzzy controller are proposed for improving the control performance of the brake system. The comparative analysis based on the simulations helps make estimations for MRB-based ABS performance.

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