Door sealing mechanism and process in vehicle engineering

2021 ◽  
pp. 095440702110598
Author(s):  
Menghan Tong ◽  
Shichao Xiu ◽  
Xiaoshan Chen ◽  
Siyu Chen
Keyword(s):  
Failure Time ◽  
Base Material ◽  
Rolling Process ◽  
Dynamics Simulation ◽  
Vehicle Engineering ◽  
Time Curve ◽  
Vehicle Noise ◽  
Rolling Pressure ◽  
Factors Influencing ◽  
Noise Vibration

The reliability of door sealing plays an important role in maintaining the quality of vehicle noise, vibration, and harshness (NVH). To improve the reliability of door sealing, a novel sealing process has been proposed. The factors influencing the door sealing quality have been investigated. The relationships between the peeling force, peeling speed, and peeling time have been calculated using the five-variable rheological theory. The maximum stress versus time curve and the distribution of stress and strain at the moment of debonding have been obtained by nonlinear solid cohesive coupling dynamics simulation. The rolling process of the door sealing strip has been developed, and automatic rolling equipment for door sealing has been designed and manufactured. The factors influencing the peeling force have been determined by a peeling test of the door sealing strip. The results show that the peeling force increases with an increase in the peeling speed and time. The C-shaped structure at the front end of the base material during the stripping process makes the peeling angle sharp. In addition, the uneven stripping speed causes the stripping line to become irregular. The peeling force increases with the increase in rolling pressure and failure time. The optimum rolling pressure was 70 N/m2 and the optimum aging time was 24 h.

scholarly journals Recent progress in battery electric vehicle noise, vibration, and harshness

2021 ◽  
Vol 104 (1) ◽  
pp. 003685042110052
Author(s):  
Xia Hua ◽  
Alan Thomas ◽  
Kurt Shultis
Keyword(s):  
Electric Vehicle ◽  
Recent Progress ◽  
Combustion Engine ◽  
Automatic Transmission ◽  
Battery Electric Vehicle ◽  
Vehicle Noise ◽  
Conventional Vehicle ◽  
Transfer Case ◽  
Air Intake ◽  
Noise Vibration

As battery electric vehicle (BEV) market share grows so must our understanding of the noise, vibration, and harshness (NVH) phenomenon found inside the BEVs which makes this technological revolution possible. Similar to the conventional vehicle having encountered numerous NVH issues until today, BEV has to face many new and tough NVH issues. For example, conventional vehicles are powered by the internal combustion engine (ICE) which is the dominant noise source. The noises from other sources were generally masked by the combustion engine, thus the research focus was on the reduction of combustion engine while less attention was paid to noises from other sources. A BEV does not have ICE, automatic transmission, transfer case, fuel tank, air intake, or exhaust systems. In their place, there is more than enough space to accommodate the electric drive unit and battery pack. BEV is quieter without a combustion engine, however, the research on vehicle NVH is even more significant since the elimination of the combustion engine would expose many noise behaviors of BEV that were previously ignored but would now seem clearly audible and annoying. Researches have recently been conducted on the NVH of BEV mainly emphasis on the reduction of noise induced by powertrain, tire, wind and ancillary system and the improvement of sound quality. This review paper will focus on recent progress in BEV NVH research to advance the BEV systems in the future. It is a review for theoretical, computational, and experimental work conducted by both academia and industry in the past few years.

scholarly journals Review of Finite Element Vehicle Interior Acoustic Simulations Including Porous Materials

2019 ◽  
Author(s):  
János Csaba Kun ◽  
Daniel Feszty
Keyword(s):  
Finite Element ◽  
State Of The Art ◽  
Academic Research ◽  
Simulation Methods ◽  
Vehicle Engineering ◽  
Vehicle Interior ◽  
Poroelastic Materials ◽  
Recent Trends ◽  
Noise Vibration ◽  
Difficult Issue

Recent trends in vehicle engineering require manufacturers to develop products with highly refined noise, vibration and harshness levels. The use of trim elements, which can be described as Poroelastic materials (PEM), are key to achieve quiet interiors. Finite Element Methods (FEM) provide established solutions to simple acoustic problems. However, the inclusion of poroelastic materials, especially at higher frequencies, proves to be a difficult issue to overcome. The goal of this paper was to summarize the state-of-the-art solutions to acoustic challenges involving FEM-PEM simulation methods. This involves investigation of measurement and simulation campaigns both on industrial and fundamental academic research levels.

Research on Dynamics Simulation of Buffering Process of Docking Mechanism

2014 ◽  
Vol 701-702 ◽  
pp. 748-752
Author(s):  
Yuan Zhang ◽  
Li Li Zhou ◽  
Jian Wang ◽  
Chang Zhen Fan
Keyword(s):  
Mathematical Modeling ◽  
Dynamic Simulation ◽  
Simulation Analysis ◽  
Structure Optimization ◽  
Working Life ◽  
Dynamics Simulation ◽  
Buffer System ◽  
Factors Influencing ◽  
Docking Mechanism ◽  
Important Basis

On-orbit service technology can extend the working life of the spacecraft, and improve the ability to perform various tasks. Docking mechanism is the key equipment of the space docking. The cushion performance of the system determines the dynamic characteristics in the docking process, and it is one of the important factors influencing the docking success or not. It is established that mathematical modeling of the new grasping mechanism in the buffering process, due to lack of the experiment equipments, the dynamic simulation on computer is an effective method to test and verify the parameters or evaluate the performance of the buffer system designed. Simulation analysis is conducted to get the corresponding buffer force for four different sets of buffer parameter, and it provides important basis for docking cushioning structure optimization.

Effects of Deep Rolling on Surface Residual Stress and Microhardness of JIS SS400 MIG Welding

2018 ◽  
Vol 939 ◽  
pp. 31-37
Author(s):  
Adirek Baisukhan ◽  
Wasawat Nakkiew
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Welded Joint ◽  
Rolling Process ◽  
Rolling Speed ◽  
Mig Welding ◽  
Deep Rolling ◽  
Surface Microhardness ◽  
Rolling Pressure ◽  
Number Of Passes

Metal Inert Gas (MIG) welding process is a common welding process for carbon steels. During the cooling after welding, non-uniform cooling cause tensile residual stress on the surface of welded joint and, in most cases, in Heat Affected Zone (HAZ) also. The tensile residual stress is undesirable because it affects the strength and shorten the workpiece fatigue life. In order to convert the tensile residual stresses to desirable compressive residual stresses, the mechanical surface treatment like deep rolling process was used in this research. The surface residual stresses were measured by XRD machine with the sin2ψ method. For statistical analysis of significant factors used in deep rolling process, there are three factors each factor has two levels: rolling pressure, rolling speed and number of passes. Taguchi experimental design was used in conjunction with a deep rolling process to determine factors affected the surface residual stresses and surface microhardness. The results of the research showed that the most significant factors that affect the surface residual stress and surface microhardness were the number of passes, followed by the rolling pressure and the rolling speed, respectively. The maximum compressive residual stress measured at the welded joint was -521.5 MPa. The highest measured surface microhardness was 266.2 HV at the welded joint. The appropriated factors of deep rolling process for JIS SS400 MIG welding were rolling pressure 270 MPa, rolling speed 1,500 mm/min and number of passes 3 times.

Major repairs of tenement buildings and its role for sustaining the human living environment

Servis plus ◽  
10.12737/5537 ◽  
2014 ◽  
Vol 8 (3) ◽  
pp. 45-50
Author(s):  
Сергей Михайленко ◽  
Sergey Mikhaylenko
Keyword(s):  
Quality Of Life ◽  
Methodological Approach ◽  
Living Environment ◽  
Living Standards ◽  
Factors Affecting ◽  
Systemic Analysis ◽  
Factors Influencing ◽  
Physical Deterioration ◽  
Noise Vibration

The article is devoted to the role and contribution of major repairs of tenement buildings for sustaining a comfortable human living environment, which is directly linked to a region’s living standards. The author identifies the constituents of a living environment and the factors influencing its maintenance in the framework of normative regulation. Major repairs include the maintenance of the performance properties — eliminating the physical deterioration and obsolescence of a tenement building, as well as ensuring the tenants’ and other persons’ safety (in terms of a wide variety of microclimate-creating factors like the quality of breathing air, lighting, noise, vibration, etc.) during and after the repair works. However, it does not target the principal technical and economic characteristics. In compliance with legal and normative regulations, major repairs programs target parts of hard assets and public premises of a tenement building. The author proposes a methodological approach to the assessment of the factors affecting the quality of life during and after the major repairs. The approach is based on the well-known method of socio-economic research involving a systemic analysis, which incorporates the multitude of interdependent and interrelated living-environment-forming factors.

Influence of Deep Rolling Process Parameters on Surface Residual Stress of AA7075-T651 Aluminum Alloy Friction Stir Welded Joint

2018 ◽  
Vol 939 ◽  
pp. 23-30 ◽  
Author(s):  
Adirek Baisukhan ◽  
Wasawat Nakkiew
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Compressive Residual Stress ◽  
Welded Joint ◽  
Rolling Process ◽  
Rolling Speed ◽  
Deep Rolling ◽  
Friction Stir ◽  
Rolling Pressure

Friction stir welding is most commonly used for joining aluminum alloy parts. After welding, residual stresses occurred in the welded joint caused by non-uniform cooling rate. Friction stir welding usually generates tensile residual stress inside the workpiece which affects the strength in addition to the fatigue life of materials. Compressive residual stress usually is beneficial and it can be introduced by mechanical surface treatment methods such as deep rolling, shot peening, laser shock peening, etc. In this research, deep rolling was used for inducing compressive residual stress on surface of friction stir welded joint. The residual stresses values were obtained from X-ray diffraction machine. Influence of three deep rolling process parameters: rolling pressure, rolling speed and rolling offset on surface residual stresses at the welded joint were investigated. Each factor had 2 levels (23 full factorial design). The statistical analysis result showed that the rolling pressure, rolling speed, rolling offset, interaction between rolling pressure and rolling speed, interaction between rolling speed and rolling offset were statistically significant factors, with the most compressive residual stress value approximately -391.6 MPa. The appropriated deep rolling process parameters on surface residual stress of AA7075-T651 aluminum alloy friction stir welded joint were 1) rolling pressure about 150 bar 2) rolling speed about 1,400 mm/min 3) rolling offset about 0.1 mm.

Numerical Investigation on Factors Influencing the Time-Dependent Stability of the Rock Slopes with Weak Structure Planes

2013 ◽  
Vol 353-356 ◽  
pp. 177-182
Author(s):  
Lian Chong Li ◽  
Shao Hua Li
Keyword(s):  
Rock Mass ◽  
Rock Slope ◽  
Failure Time ◽  
Time Dependent ◽  
Catastrophic Failure ◽  
Long Term Stability ◽  
Stability Of Slopes ◽  
Factors Influencing ◽  
Weak Structure

Under the combined effects of various external factors, such as temperature, seepage, alternate wetting and drying and so on, the mechanical properties of rock mass are susceptible to be deteriorated, and its strength characteristics are significantly degraded with time. The mesoscopic damage accumulated inside the rock, contributing the rock slope instability with weak structure planes, generate the time-dependent deformation, and eventually lead to the slope failure. Given the time-dependent deformation of the rock, numerical simulations are conducted to investigate the key factors influencing the long-term stability of slopes. Numerical results show that the catastrophic failure time of slopes is linear to its cohesion, and the bigger cohesion and friction angle increase catastrophic failure time, i.e., the stability of rock slope increase. In addition, the configuration of the intact rock bridge can also influence the time-dependent slope stability. Slope height can significantly affect the slope stability and the maximum horizontal displacement. Differences in rock mass storage environment play an important role in the long-term stability of slopes.

scholarly journals Analysis and Optimization of Low-Speed Road Noise in Electric Vehicles

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Wentao Yu
Keyword(s):  
Working Condition ◽  
Dynamic Vibration Absorber ◽  
Modal Frequency ◽  
Vehicle Noise ◽  
The Road ◽  
Acoustic Cavity ◽  
Asphalt Road ◽  
Road Excitation ◽  
Noise Vibration ◽  
Pressure Sensation

When a certain electric vehicle is driving at a constant speed of 40 km/h on the rough asphalt road, the rear passenger can obviously feel the ear pressure, which seriously affects the comfort. Through the analysis of objective data, it was found that the problem was caused by the road excitation, which leads to the coupling between the mode of the backup door and the mode of the acoustic cavity, and causes the resonance of the car cavity, thus causing the ear pressure sensation. To solve this problem, this paper optimizes the backup door by means of experiment and simulation, increases the dynamic vibration absorber, makes its modal frequency avoid the acoustic cavity modal frequency, and achieves the purpose of reducing the interior noise. After optimization, the vehicle noise is reduced by 8 dBA at 42 Hz under 40 km/h working condition of rough road surface, and the ear pressure sensation is reduced at the same time, thus improving the NVH (noise, vibration, and harshness) performance of the vehicle.

Analysis of rolling pressure in asymmetrical rolling process by slab method

2009 ◽  
Vol 16 (4) ◽  
pp. 22-26 ◽  
Author(s):  
Yong Tian ◽  
Yan-hui Guo ◽  
Zhao-dong Wang ◽  
Guo-dong Wang
Keyword(s):  
Rolling Process ◽  
Slab Method ◽  
Asymmetrical Rolling ◽  
Rolling Pressure
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