• 제목/요약/키워드: dropping shock

검색결과 18건 처리시간 0.009초

냉장고의 유통 중 진동 및 낙하충격에 관한 연구 (A Study on the Vibration and Dropping Shock of Refrigerator during Physical Distribution)

  • 이수근
    • 한국포장학회지
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    • 제8권1호
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    • pp.23-26
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    • 2002
  • This study was carried out to investigate vibration shock and dropping shock of refrigerator during physical distribution. The values of vibration shock were measured to be ${\sim}3G$ for up and down direction, ${\sim}0.8G$ for right and left direction and ${\sim}0.5G$ for back and forth direction on the national road. There was no damage during transport. From the results of dropping test by KS A 1026(General Rules of Performance Testing for Packaged Freights), relative equations were gained as follow : y = 0.12x + 7.63(where y is G-factor and x is Dropping height). The maximum values of dropping shock during materials handling were measured to be 11G. This shock value was corresponding to dropping shocks of dropping height 28.3cm by KS A 1026.

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가전제품의 하역 중 낙하충격에 관한 연구 (A Study on the Dropping Shock of Household Electric Appliances during Materials Handling)

  • 이수근
    • 한국포장학회지
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    • 제6권1호
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    • pp.37-40
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    • 2000
  • This study was carried out to investigate dropping shock of household electric appliances during materials handling. Microwave oven($18{\ell}$), TV(16") and washing machine(6.2kg) were singled out as the study items. From the results of dropping test by KS A 1026(General Rules of Performance Testing for Packaged Freights), relative equations were gained as follow : y=0.0863x+10.032 for microwave oven, y=0.136x+7.85 for TV and y=0.214x+5.8 for washing machine (where y is G-factor and x is Dropping height). The maximum values of dropping shock during materials handling were measured to be $11{\sim}14G$ for microwave oven, $12{\sim}15G$ for TV and $10{\sim}12G$ for washing machine. The maximum shocks of microwave oven, TV and washing machine during materials handling were corresponding to dropping shocks of dropping height 45.98cm, 52.57cm and 28.97cm by KS A 1026.

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유한 요소법을 이용한 초소형 광디스크 드라이브의 충격해석 (Shock Response Analysis of Small Form Factor Optical Disk Drive using Finite Element Method)

  • 김시정;장영배;박노철;박영필
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2004년도 춘계학술대회논문집
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    • pp.173-176
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    • 2004
  • Nowadays, mobile devices are very common equipments such as mobile phone, PDA, etc. These equipments need information storage devices. Optical storage devices have more advantages than other storage devices, but it is not free from shock situation like dropping by user's mistakes. A complete model of a Small Form Factor Optical(SFFO) disk drive subject to shock loads is developed to investigate the response of the pickup/disk interface. With this model, we can simulate the drop test and consider the matters of shock simulation using commercial software(Ansys/LS-Dyna).

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고무를 이용한 완충요소의 설계 및 성능시험 (Design and Performance Test of Rubber Mounts for Shock-Isolation)

  • 유춘화;권형오;이신언
    • 소음진동
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    • 제2권1호
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    • pp.41-47
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    • 1992
  • In order to reduce the shock which may occur during shipping of a drumtype container, rubber mounts were designed using a commercial FEM package and manufactured, and then the performance was checked by static and dynamic test. According to the design specifications, the container system was tested by dropping. The experimental results are compared with the theoretical ones.

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점탄성 테이프를 적용한 적층형 블레이드 기반 충격저감장치 (Development of Laminated Blade Based Shock Absorber Using Viscoelastic Adhesive Tape )

  • 최재섭;박연혁;오현웅
    • 항공우주시스템공학회지
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    • 제17권2호
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    • pp.86-93
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    • 2023
  • 일반적으로 발사체의 페어링, 위성체 및 단 분리와 더불어 위성체의 전개형 구조물 분리 시 높은 신뢰도의 화약폭발 기반 파이로 분리장치가 주로 적용되고 있다. 이로부터 발생되는 파이로 충격은 짧은 시간에 높은 진폭의 하중이 발생함으로써, 위성 전장품 등 주요 탑재장비에 일시적 또는 영구적 손상을 유발하여 임무 실패를 초래할 수 있다. 본 연구에서는 파이로 구속분리장치의 폭발 시 전달되는 충격하중 저감을 목적으로 저강성 블레이드 기반 충격저감장치를 제안하였다. 설계의 주안점은 저강성 블레이드 적용에 따라 발사진동환경 하 구조건전성 확보에 취약한 문제점을 해결하기 위해 고댐핑 특성 구현이 가능하도록 점탄성 테이프를 이용한 적층형 구조를 적용함에 있다. 상기 충격저감장치의 설계 유효성은 낙하추를 이용한 충격시험을 통해 입증하였으며, 발사진동환경 하 구조건전성은 전개형 구조물 모사 모델을 적용한 하중조건에서의 구조해석을 통해 평가를 수행하였다.

산업용 안전모 정부 근처 통기구멍에 관한 연구 (A Study on Ventilation Holes Near the Crown of Industrial Safety Helmets)

  • 김진현;최혁중
    • 한국안전학회지
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    • 제27권5호
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    • pp.196-202
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    • 2012
  • An industrial safety helmet primarily intended to protect the wearer's head. It is to prevent or reduce the danger due to flying or dropping objects, falling and prevent the danger due to an electric shock given to the head. However, thermal discomfort of the head is one of the main complaints in the case of wearing safety helmet. Ventilation holes are not allowed in safety helmets on domestic regulations except for industrial safety helmets which are to protect wearer's head against flying or dropping objects. This paper is to produce the need for enlargement of allowing on ventilation holes' regulation to class B. This study reviewed foreign standards' regulations on ventilation holes of safety helmets. Some standards recommend that ventilation may be improved when fresh air is able to enter the helmet around its lower edge and to exit via holes in the helmet located in the upper one third of the helmet. And in the experiments, relationships of ventilation holes and the temperature over the head are analyzed. The experimental results show that the cooling effect of ventilation holes in the upper one third of the helmet is meaningful.

Human Behavior Analysis under Drop Test using MADYMO

  • Choi, Homin;Kim, Jaeki;Pack, Inseok;Lee, Inyoung;Lee, Seoksoon
    • International Journal of Aerospace System Engineering
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    • 제3권2호
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    • pp.22-25
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    • 2016
  • This dissertation tried to analyze passenger behaviors after an accident with the possibilities of a variety of accidents open reflecting the phases of the times of increasing interests in safety of passengers as the use of means of transportation such as cars and airplanes is increasing. Because a lot of data on head-on collisions, broadside collisions and reverse side collisions have been gathered through lots of experiments and interpretations, I chose to study a relatively unfamiliar subject, dropping collision. For example, I tried to study passenger behaviors in seating position after a dropping collision in preparation for falling accidents due to recent frequently-occurring sinkholes, driver's carelessness or mechanical problems. I used MADYMO, passenger behavior interpretation program, and experimented with 2 meters high Drop Test device which I made in person to increase the reliability of the results. On the basis of these, I compared the real experiments with interpretations.

고속충돌시험기 개발 및 부재의 충돌특성 실험에 관한 연구 (I) (A Study on the Development of Test Rig for High Speed Frontal Crash and Test of Members ($\textrm{I}$))

  • 강신유;장인배;김헌영;정규진;박경환
    • 한국정밀공학회지
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    • 제17권6호
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    • pp.119-126
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    • 2000
  • In this paper. a simple high-speed crash test rig for members of vehicle was developed for the improvement of crashworthiness of vehicle's side rail. The cart hanging the specimen is accelerated up to 35 mph by the force of freely dropping weight and 1:3 accelerating pulleys. The cart with shock absorbers travels on the rail roads, so it does not transfer any additional vibration to the specimen. To measure the test results, two types of accelerator are considered. the one is a strain gage type and the other is a piezo type. The test rig is rated good to test the specimen like a side rail of vehicle as developing the vehicle's structures in the early design stage.

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Investigation on the Health and Safety Hazards of Construction Workers

  • Kal, Won-Mo;Park, Jong-Tae;Son, Ki-Sang
    • International Journal of Safety
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    • 제4권2호
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    • pp.43-46
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    • 2005
  • The construction workers might be at the risk of many occupational injuries and illnesses. To protect workers from various hazards, industrial health and hygiene systems were specified for the construction workers by law. It is important to know the actual health and safety(H&S) conditions by tasks and the characteristics of injuries and illnesses of construction workers. This study was designed to investigate the actual conditions of construction workers exposed to various harmful substances and work elements including evaluation of health status of each worker and general H&S system. Questionnaire was sent to 600 construction workers nationwide and totally 367 people responded to it having 61.67% of response rate. The common construction hazards were dust(29.6%), noise(19.3%), repetitive motions(12.0%), handling excessive heavy materials(11.2%) in order. The repetitive motions and handling heavy materials related to muscle disorders accounted for 23.2%. The accident and injury types were in order of overexertion, falling, overturning, dropping or flying, electric shock, collision, etc.

A Study on the Development of Test Rig for High Speed Frontal Crash and Test of Members

  • Shin-You. Kang;In-Bae. Chang;Jang, Hye-Jeong
    • International Journal of Precision Engineering and Manufacturing
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    • 제3권3호
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    • pp.21-27
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    • 2002
  • In this paper, a simple test rig of high-speed crash for the front members of vehicles was developed for the improvement of crashworthiness of vehicle's side rail. The cart hanging the specimen is accelerated up to 35 mph by the traction wire and by the force of freely dropping weight and 1:3 accelerating pulleys. The cart with shock absorbers travels on the rail roads, so it does not transfer any additional vibration to the specimen. In order to measure the energy absorbed by the specimen when it collapse to the wall and during it deform, the two strain gage type load cells are used at the wall place. The test rig rated good to test the specimen like a side rail of vehicle as developing the vehicle's structures in the early design stage.