• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 2001.12a
• /
• pp.157-160
• /
• 2001

본 논문에서는 강수량과 자동차 주행속도 등의 환경조건에 따라 와이퍼 속도를 일정하게 적용한 기존의 시스템을 개선하여 운전자의 개인 특성에 의해서도 속도 변경이 가능하게 함으로서 인간에게 조금 더 친밀감을 제공하는 시스템을 구현하였다. 초기 와이퍼 속도는 입력받은 강수량과 자동차 주행 속도로 추론하여 구하였다. 추론된 와이퍼 속도를 운전자의 개인 특성에 따라 변경하고자 할 경우, 해당 음성명령을 입력받아 재 추론하였다. 음성인식을 위해서는 고립단어 인식에 적절한 DTW방식을 사용하였고, 와이퍼 속도는 퍼지 추론을 적용하여 구하였다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2010.10a
• /
• pp.598-598
• /
• 2010

와이퍼 작동 중에 발생하는 진동소음 중 1000Hz 이상의 스퀼 소음은 발생 메커니즘이 정확하게 알려지지 않았으며 발생하는 조건도 불규칙하다. 이 스퀼 소음의 발생 빈도 및 주파수를 변경하는 설계를 위하여 스퀼 진동 소음의 발생 메커니즘의 원인분석이 우선적으로 이루어져야 한다. 이 논문에서는 자동차 와이퍼 시스템에서 워셔액을 분사하였을 때 발생하는 스퀼 소음을 측정하고 인자 별로 분석하였다. 스퀼 소음이 발생하는 인자들을 마찰계수와 연관이 있는 인자, 기하학적인 인자, 와이퍼의 운동과 관련된 인자들로 나누어 분석하였다. 실제 와이퍼 시스템을 구현하기 위하여 모터와 원판 지지대 등을 이용하였고, 마이크로폰, 레이저 바이브로미터, 노이즈북, 아르테미스를 이용하여 측정 및 분석하였다.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.35 no.4
• /
• pp.345-352
• /
• 2011

In the present study, a three-dimensional CFD simulation on aerodynamic lift acting on windshield wiper blades was performed to improve the wiping performance of a vehicle moving at a high speed. To predict the reliable flow characteristics around the windshield wiper system, the computational domain included the full vehicle model with detailed geometry of wiper blades in the wind tunnel. From the numerical results, the drag and lift coefficients of wiper blade were obtained for the performance of windshield wiper. With this aerodynamic characteristics of windshield wiper, the effects of wiping angles and hood tip angle on the wiping performance of the windshield wiper were evaluated.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.5 no.4
• /
• pp.435-442
• /
• 2010

The efficiency of the car's wiper blade has a great contribution to the guarantee of security. To guarantee the wiper blade's ability of getting rid of dust sticking on the glass surface, the qualities of lubricant, durability, heat resistant, low temperature, ozone resistant, chemical resistant must be good as well as it being noiseless. Like this, in order to improve the wiper's skills, it is essential to have a system that is able to assess and analyse the properties of the wiper. In this paper, to create a system that measures the car's wiper pressure, an analog/digital converter (ADC) that receives signals generated from the pressure sensor and transmits it to a personal computer is proposed. The designed ADC is one of the pipeline ADCs that can obtain fast movement rate and also a structure that can optimize the entire system's area as well as the consumption of strength.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.14 no.3
• /
• pp.51-57
• /
• 2006

The contact pressure distribution between a rubber wiper blade and a glass windshield is a major factor for wiping performance. A modeling and simulation method has been developed to forecast the contact pressure distribution on a wiper blade. For modeling multi-body dynamics of an wiper linkage system and flexible nature of wiper blade, ADAMS and ADAMS/flex are employed. A simulation study has been also conducted to obtain contact pressure distribution. Comparison between simulation and measurement is provided to ensure fidelity of the model and the simulation method.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.9 no.2
• /
• pp.210-215
• /
• 2001

The pole antenna of vehicles for AM/FM radio broadcasting receptions has many probems, such as damageable mechanical system and noise etc. It is considered that noise is composed of the structural vibration noise and the air flow induced aerodynamic noise. Also we find out that the setting process of a printed on-glass automobile antenna has many difficulties. Recently, the above mentioned problems can be reduced by employing enhanced wiper antenna which utilizes the windshied wiper arm. The new system is a passive antenna. In this study, experiments for the characteristics of a wiper antenna by measuring the SWR, radiation pattern and received powe have been carried out. The experimental results show that the efficiency of the wiper antenna has better performance than any other antenna.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.18 no.4
• /
• pp.79-83
• /
• 2010

Recently, the flat wiper which is one piece wiper and subjected to a pressing force at a single center point is gaining wide applications on automotive windshields. However, nonuniform reactive pressure distributions takes place, so that wiping is not completed at such locations. The wiping performance of the flat wiper is best when a wiper and a curved windshield have perfect contact without gaps under the specified pressing force of 13 ~ 15 gf/cm. Therefore, it is necessary that the realistic curvature equation of a wiper spring-rail should be obtained. Finite element analysis, CATIA script-macro function, and the least square method were utilized to find out the curvature of a spring-rail for a perfect contact with a windshield under a specified concentrated load. The curvature equation became the third order polynomial.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.18 no.4
• /
• pp.465-472
• /
• 2008

An automotive windshield wiper system is modeled mainly for vibration analysis purpose. The model is composed of solid links, ideal joints, imperfect joints to simulate unavoidable manufacturing defects and bushings having stiffness, contact between a wiper blade and a wind screen glass, friction, a spring and an actuator. Main stream of wiper dynamics analysis has been obtaining a closed form of system of equations using Newton's or Lagrange's formula and doing a numerical simulation study to understand and predict the behavior of it. However, the modeling process is complex since a wiper system is of multibody and a contact problem occurs. When imperfection, such as dead zone of a joint and stiffness of a rubber bushing, should be included, the added complexity makes the modeling difficult. Since the imperfection is understood as main cause of problematic vibration, the dynamics model of a wiper system aiming vibration analysis should include such unavoidable manufacturing defects in the model. An open form of dynamic model of a automotive windshield wiper system with imperfect joints using a commercial software is obtained and a simulation analyssis is conducted for vibration reduction study.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.13 no.4
• /
• pp.58-65
• /
• 2005

A method measuring angular speed and estimating angular acceleration of an automotive wind shield wiper pivot with limited resources has been proposed. Limited resources refer to the fact that processes cannot be operated in real-time with a regular notebook running a Microsoft Windows. Also, they refer to the fact that data acquisition cards have only two general purpose counters as many generic cards do. An optical incremental encoder has been employed for measuring angular motion. To measure the angular speed of the pivot, periods for the encoder's output pulses have been measured as the speed is related to the reciprocal of the period. Since only information acquired from one counter channel is the magnitude of the angular speed, sign correction is necessary. Also the information for the exact time when a pivot passes left and right dead points is also missing and the situation is inherent to the hardware setup. To find out the zero-crossing time of the angular speed, a linear interpolation technique has been employed. Lastly, to overcome the imperfection of the mechanical encoders, the angular speed has been curve fitted to a spline. Angular acceleration can be obtained by a differentiation of the angular speed.

• The Journal of the Acoustical Society of Korea
• /
• v.37 no.5
• /
• pp.292-299
• /
• 2018

The vehicle exterior design is the main parameter of aerodynamic wind noise, but the modification of it is nearly impossible at a proto-type stage. Therefore, it is very important to verify exterior design and estimate the correct wind noise level at the early vehicle design stages. The numerical simulations of aerodynamic wind noises around A-pillar and wiper were developed for specific vehicle exterior designs, but could not be directly used for the discussions with designers because these need complex modeling and simulation process. This study proposes new approach to A-pillar and wiper wind noise estimation at design stage using response surface methodology of modeFRONTIER, of which database is composed of PowerFLOW simulation, PowerCLAY modeling, SEA-Baced (Statistical Energy Analysis-Based) interior noise simulation, and turbulent acoustic power simulation. New design parameters are defined and their contributions are analyzed. A state-of-the-art, easy and reliable CAT (Computer Aided Test) tool for A-pillar and wiper wind noise are acquired from this study, which shows high usefulness in car development.