Applied Mechanics and Materials Vols. 494-495

Abstract: The paper analyzed the influence of the friction factor theoretically on the brake system to produce noise, through complex modal analysis method, established the finite element model of air disc brake to analyze and forecast the brake noise and get brake noises frequency on a certain test conditions. Through the analysis of multiple sets of brake noise under different friction coefficient, it is concluded that the increase of friction coefficient has a promoting effect on brake noise.

Abstract: Based on biomechanic theory, the comfort evaluation can be made to aim at improving the comfort of clutch operation of light commercial vehicle. First, the virtual model of the cab was established to predict posture of pressing clutch pedal. Then values of joint toques were figured out by using Jacobin Method and these data were brought into the comfort evaluation function to achieve the comfort degree of clutch operation. From the perspective of biomechanics, this research reveals the cause of clutch operation discomfort in a deeper sense and will provide a new reference approach for improving operation comfort of light commercial vehicle.

Abstract: The thermoelectric generator (TEG) recovering waste heat from the exhaust has became a potential technical issue, due to its characters of pollution-free, no moving parts, reliability and high efficiency. There exist arrangement on the chassis and the exhaust backpressure of whole system will increase of these two problems, when integrating TEG in the car of TEG and the muffler is to integrate the thermoelectric module on the surface muffler, it can effectively reduce the size of TEG, also reduce its weight and structural complexity. It also reduced the backpressure of TEG, meanwhile solved the compatibility issues with other components of exhaust system. The structural integration laid the foundation to achieve the large-scale use of thermoelectric materials in the car.

Abstract: For the poor ride comfort performance of the articulated dump truck, the dynamic model of ADT was built and its dynamic characteristics were also studied through finite element and multi-body system dynamic theory. According to the modal neutral file generated by finite element software with the flexible processing, the flexible coupling virtual prototyping model was set up for the multi-body dynamics simulation in ADAMS to obtain and analyze the data about the ADT ride comfort. This paper provided references for the design, redesign and optimization of the ADT.

Abstract: The Hall automotive wheel speed sensor and have been studied, based on the its signal characteristic, the signal process circuit model that contains limiter circuitlow pass filter and lagging comparator has been established. The corresponding simulations under the Matlab/Simulink show that the working stability and anti-interference of this circuit can meet the demand of speed signal processing.

Abstract: Rear-view mirrors vibration that was dangerous when the car is moving at high speed poses a serious threat to traffic safety. The wind-induced vibration has been one of the urgent issues in rear-view mirror system. The air power generated when the car is fast moving and inertia force generated when the rear-view mirror vibrates, constitute a feedback process in the form of a closed loop, so that the amplitude will increase with time. A gas excitation model coupled rearview mirror with air flow vibration was established. CAE analysis method was adopted to prove the theoretical methods.

Abstract: When automobile is braking in a turn, the left and right wheel load changes, often leads to excessive loss of vehicle steering stability. The process of steering is often accompanied with braking, we can improve the control strategy of anti-lock braking system which widely used in vehicles to maintain the steering-braking lateral stability.

Abstract: After a long run, the places of body cooperate with valve very easy to produce fatigue cracks. This cracks if not detected, extremely easy to have the accident. As the most commonly used testing equipment, ultrasonic nondestructive testing is often used to detect the engine body. However, most of the existing ultrasonic nondestructive testing equipment is used to detect whether there is a defect, there is little research the specific size of defects. According to the principle of ultrasonic emission, theoretical calculation and combined with test block, get the body phased array detection method.

Abstract: The FEM model of the body and acoustic cavity are created, and the acoustic-structure coupled system is built up,and the SPL(sound press level) of points corresponding to the drivers ear and passengers ears were calculated using software LMS.virtual.lab. And there are several relatively noticeable acoustic pressure peaks around 60Hz, 102Hz, 120Hz and 168Hz. The maximum noise value was calculated by using the method of ATV method, several suggestions are advised to decrease the vehicle interior noise so that the vehicle ride comfort could be improved.

Abstract: This paper introduces the meaning of reducing the radiated noise of oil sump. By using Hyperworks and Nastran, the modal analysis and optimization design of engine oil sump are finished. This paper aims at avoiding the actual measured inherent frequency by increasing modal frequency to reduce the radiated noise. At the same time, the optimum quality allocation of oil sump can be achieved. The result of optimization design can be proved through the test.