• Title/Summary/Keyword: Uneven wear

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Evaluation and Analysis of Wheel alignment Effecting on Tire Uneven Wear (휠 얼라이먼트 값과 타이어 편마모 영향도 평가 및 분석)

  • Chung, Soo-Sik;Jung, Won-Wook;Lee, Sang-Ju;Koh, Bum-Jin;Choi, Young-Sam
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1658-1662
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    • 2007
  • The tire uneven wear has been an ongoing concern for a long time, and one of customer's complaints too. This paper deals with uneven wear improvement of passenger car tires, to have tested the tire wear levels by each wheel alignment set (according to changing toe and camber) using taxis. The pre-set wheel alignments on test vehicle were gained by energy friction simulation of tire. The result of this experiment was as follows : First, verified the effects of initial wheel alignment (adjusted at Curb Vehicle Weight) to minimize tire uneven wear. Second, tire uneven wear makes tire life much shorter than even wear does.

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Robust Design of the Disc Brake Pad Shape for Reduction of Uneven Wear (디스크 브레이크의 편마모 저감을 위한 브레이크 패드의 마찰재 형상 강건설계)

  • Park, Jin-Tack;Choi, Nak-Sam
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.1
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    • pp.77-87
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    • 2012
  • In this paper, the method and its effectiveness to decrease the uneven wear of the brake pad were proposed. A finite element analysis was performed to analyze the pressure distributions on the contact surfaces. The optimum brake pad shape was determined by a robust design using the Taguchi method. The effectiveness of the optimum design was clarified by the wear tests with a dynamometer.

Robust Design of the Back-plate Shape of the Disc Brake Pad for Reduction of Uneven Wear (디스크 브레이크의 편마모 저감을 위한 브레이크 패드의 백플레이트 형상 강건설계)

  • Park, Jin-Tack;Han, Seung-Wook;Choi, Nak-Sam
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.1
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    • pp.8-19
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    • 2014
  • In this paper, a robust design of the back-plate of the brake pad to decrease the uneven wear of the pad was studied. A finite element analysis was performed to analyze the pressure distributions on the contact surfaces. Optimized back-plate shape of the brake pad was determined using the Taguchi method. The effectiveness of the robust design was clarified by the wear tests with a dynamometer.

Designed tire wear and uneven wear determination system using only tire laser sensor (타이어 전용 레이저 센서를 이용한 타이어 마모도 및 편마모 판별 시스템 설계)

  • baek, Sung-hyun;Jang, Jong-Wook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.05a
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    • pp.346-349
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    • 2015
  • Generally, in order to verify the degree of tire wear or abnormal wear, a driver or an auto mechanic checks the degree of tire wear and the existence of tire abnormality, directly with the naked eye or by way of using a gauge equipment. In case of such verification, individual subjective judgments may be involved or a driver may suffer heavy burdens to expend the time and cost for using the wheel alignment equipment. Therefore, this thesis will use a number of laser sensors to check the existence of abnormal wear and the degree of wear on each tire and develop a system checking the sides of tires to receive the tire information, so that subjective judgments may be overcome and objective and accurate judgments may be rendered.

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A Study on Material Development for and Application of a Slider of Pantograph (전동차 주습판(Pantograph Slider) 재질개선 및 실차 적용에 관한 연구)

  • Cho, Kyu-Hwa
    • Journal of the Korean Society for Railway
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    • v.18 no.5
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    • pp.410-418
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    • 2015
  • A slider of the pantograph undergoes uneven and abnormal wear due to sliding contact with the catenary. In the case of rain, the loss of lubricant increases the frictional resistance for the reciprocating motion between the catenary and the slider, accelerating local wear. The slider in the winter should have good wear resistance, which can be achieved through alloy design. Uneven and abnormal wear were not observed in the results of a driving test using a wear resistant slider. It was found that the increased density of the slider enhanced the corrosive effects of Fe-Ti, preventing the occurrence of abnormal wear by maintaining the wear and arc resistance in the rainy season. Also, mechanical and electrical wear did not affect the composition of the slider, and this improved the wear resistance. Inaddition, the slider was applied to an entire train and was tested during driving; ananalysis of the correlation of the catenary was performed, including during the rainy season and the winter season.

범위 레이저 센서를 이용한 타이어 정보 인식 시스템 설계

  • baek, Sung-hyun;Jang, Jong-Wook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.216-219
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    • 2015
  • 일반적으로 타이어의 정보를 알기 위해서는 운전자나 정비사가 직접 타이어를 육안으로 타이어의 측면의 정보를 확인하거나, 타이어의 측면을 사진을 찍어 확인하는 방법을 이용한다. 이러한 방법은 개개인의 직접 인터넷으로 정보를 알아 봐야하고, 사진 찍을때의 환경에 따라 정보가 틀려져, 이는 개개인의 긴간적인 부담과 정보의 오차가 발생하게 된다. 그래서 본 논문에서는 측면의 타이어 정보 인식을 더욱 더 정확하고 시간적인 부담을 줄이기 위해 범위 레이저 센서를 이용하여 타이어의 옆면을 체크 하는 시스템을 개발하여 객관적이고 정확한 판단을 내릴 것이다.

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Development of deep learning algorithm for classification of disc cutter wear condition based on real-time measurement data (실시간 측정데이터 기반의 디스크커터 마모상태 판별 딥러닝 알고리즘 개발)

  • Ji Yun Lee;Byung Chul Yeo;Ho Young Jeong;Jung Joo Kim
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.26 no.3
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    • pp.281-301
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    • 2024
  • The power cable tunnels which are part of the underground transmission line project, are constructed using the shield TBM method. The disc cutter among the shield TBM components plays an important role in breaking rock mass. Efficient tunnel construction is possible only when appropriate replacement occurs as the wear limit is reached or damage such as uneven wear occurs. A study was conducted to determine the wear conditions of disc cutter using a deep learning algorithm based on real-time measurement data of wear and rotation speed. Based on the results of full-scaled tunnelling tests, it was confirmed that measurement data was obtained differently depending on the wear conditions of disc cutter. Using real-time measurement data, an algorithm was developed to determine disc cutter wear characteristics based on a convolutional neural network model. Distributional patterns of data can be learned through CNN filters, and the performance of the model that can classify uniform wear and uneven wear through these pattern features.

Study on the Pad Wear Profile Based on the Conditioner Swing Using Deep Learning for CMP Pad Conditioning (CMP 패드 컨디셔닝에서 딥러닝을 활용한 컨디셔너 스윙에 따른 패드 마모 프로파일에 관한 연구)

  • Byeonghun Park;Haeseong Hwang;Hyunseop Lee
    • Tribology and Lubricants
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    • v.40 no.2
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    • pp.67-70
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    • 2024
  • Chemical mechanical planarization (CMP) is an essential process for ensuring high integration when manufacturing semiconductor devices. CMP mainly requires the use of polyurethane-based polishing pads as an ultraprecise process to achieve mechanical material removal and the required chemical reactions. A diamond disk performs pad conditioning to remove processing residues on the pad surface and maintain sufficient surface roughness during CMP. However, the diamond grits attached to the disk cause uneven wear of the pad, leading to the poor uniformity of material removal during CMP. This study investigates the pad wear rate profile according to the swing motion of the conditioner during swing-arm-type CMP conditioning using deep learning. During conditioning, the motion of the swing arm is independently controlled in eight zones of the same pad radius. The experiment includes six swingmotion conditions to obtain actual data on the pad wear rate profile, and deep learning learns the pad wear rate profile obtained in the experiment. The absolute average error rate between the experimental values and learning results is 0.01%. This finding confirms that the experimental results can be well represented by learning. Pad wear rate profile prediction using the learning results reveals good agreement between the predicted and experimental values.

Wear Characteristics of Automotive Disc Brakes: Effect of Gray Cast Iron Microstructures (자동차 브레이크용 디스크의 미세조직에 따른 편마모 특성에 관한 연구)

  • Lee, Jae-Young;Kim, Seong-Jin;Han, Chang-Joo;Jang, Ho
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2002.05a
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    • pp.235-239
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    • 2002
  • The objective of the experiment is to investigate the effect of microstructures of gray cast iron oil wear characteristics of automotive disc brakes. Six different gray cast iron rotors were manufactured by changing carbon equivalent and cooling rate. The change of DTV (disc thickness variation) before and after wear tests was measured to examine the wear properties according to the microstructures of gray iron discs since the DTV generation is caused by the circumferential uneven wear. Experimental results showed that the morphology of graphite flake and hardness in gray cast iron were crucially associated with the change of DTV. In particular, the DTV changes of rotor decrease when the length and area fraction of graphite flake in brake rotors increase and hardness of brake discs reduces.

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Design Variables of Chemical-Mechanical Polishing Conditioning System to Improve Pad Wear Uniformity (패드 마모 균일성 향상을 위한 CMP 컨디셔닝 시스템 설계 변수 연구)

  • Park, Byeonghun;Park, Boumyoung;Jeon, Unchan;Lee, Hyunseop
    • Tribology and Lubricants
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    • v.38 no.1
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    • pp.1-7
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    • 2022
  • Chemical-mechanical polishing (CMP) process is a semiconductor process that planarizes a wafer surface using mechanical friction between a polishing pad and a substrate surface during a specific chemical reaction. During the CMP process, polishing pad conditioning is applied to prevent the rapid degradation of the polishing quality caused by polishing pad glazing through repeated material removal processes. However, during the conditioning process, uneven wear on the polishing pad is inevitable because the disk on which diamond particles are electrodeposited is used. Therefore, the abrasion of the polishing pad should be considered not only for the variables during the conditioning process but also when designing the CMP conditioning system. In this study, three design variables of the conditioning system were analyzed, and the effect on the pad wear profile during conditioning was investigated. The three design variables considered in this study were the length of the conditioner arm, diameter of the conditioner disk, and distance between centers. The Taguchi method was used for the experimental design. The effect of the three design variables on pad wear and uniformity was assessed, and new variables used in conditioning system design were proposed.