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Flexible Palm 어댑터의 개발을 통한 동력 공구의 진동 특성을 고려한 방진장갑의 성능 평가
송치문(Song, Chi-Mun),장한기(Jang, Han-Kee),홍석인(Hong, Seok-In),채장범(Chai, Jang-Bom) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.2
This study aims to show the guideline to select optimal anti-vibration gloves for specific power tools to prevent hazardous vibration to human body. It is most desirable for the correct evaluation of handtransmitted vibration form the power tool handle to measure the acceleration between the handle surface and the hand palm as recommended in ISO 5349-1. First, the accurate acceleration measurement device was developed of which the thickness and weight were less than 6 mm and 12 g respectively so that it can be placed between the handle and the palm without any inconvenience during the measurement. Finally, using the device we estimated anti-vibration glove performances considering the frequency characteristics of generated vibration by the power tool.
장한기,김승한,송치문,김성환,홍석인 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.7
This study alms to investigate the dynamic properties of express buses in the very low frequencies which cause motion sickness Incidence. Since passengers often use express buses for long distance traveling. it is a critical point whether the ride give rise to motion sickness or not. In the study accelerations at the three Points on the floor of the six test vehicles were measured during the driving at constant speeds. By applying the frequency weighting corves suggested in ISO 26.31-1, the Physical quantity of accelerations were changed into the perceptual amount used to judge quantitatively the incidence of motion sickness. Motion sickness dose values were calculated from the frequency weighted time history of acceleration signals, and compared between the vehicles, driving conditions. and the seat positions in the bus. During the 50 minutes' driving on the public road and high ways. the vomiting incidence ratios were seen to range from 0.4 to 0.8 %. which is equivalent to 2.4 to 4.8 % for 5 hours' driving. Unlike the very smooth road conditions considered in this work, motion sickness dose values encountered in real situations are expected to increase.
공사장에서의 건설장비의 음향파워 및 지향지수 특성 분석
조연(Yeon Cho),송치문(Chi-Mun Song),황대선(Dae-Sun Hwang),임정빈(Jung-Bin Lim) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.1
The construction noise has been one of the main issues in environment pollution area. It causes most complaints from the people around construction sites and leads to ever strict regulations to reduce. Main source is the noise from various machines in operation under many different conditions. To build proper measure to reduce construction noises, acoustic data such as sound powers and direction indices are required for each machines. Since sound power data for construction machineries were not available, a rough estimation from sound pressure level at certain distance from a machine has been used until recently. In this study, sound power and direction indices are evaluated and analyzed for eight kinds of construction machineries under various working conditions by measuring equivalent sound pressure levels at the construction site according to ISO 6395. This results will be used for noise prediction for a residential area nearby construction site.
이상욱,조연,박종근,황대선,송치문,이철희,Lee, Sang-Wook,Cho, Youn,Park, Jong-Geun,Hwang, Dae-Sun,Song, Chi-Mun,Lee, Chul-Hee 한국음향학회 2010 韓國音響學會誌 Vol.29 No.4
생활수준의 향상으로 실내용 가전제품 개발의 초점은 제품의 성능 뿐 아니라 소음, 디자인과 같은 요소에 맞추어지고 있다. 청소기는 가전제품 중, 큰 소음을 발생시킴으로써 소음 감소를 위한 많은 연구가 진행되고 있다. 따라서 청소기의 체감 소음 측정 방법에 대한 연구는 청소기 소음 제어에 중요한 역할을 할 것으로 기대된다. 본 논문에서는 청소기 체감 소음 측정을 위하여 청각 시스템을 기반으로 객관적 음질 특징을 제시한다. 인간의 청각 시스템은 특정 주파수 대역에 민감하게 반응하므로, 청각에 민감한 주파수 대역의 소음에너지를 줄이는 것이 중요하다. 본 논문에서는 녹음된 소음의 특정 주파수 영역의 평균 에너지를 계산하여 이를 청소기 음질 측정을 위한 새로운 객관적 특징 값으로 제시한다. 제시하는 객관적 특징 값의 성능을 평가하기 위하여, 14개 청소기의 소음을 녹음한 후, 100명을 대상으로 PCM 및 ACR 주관적 평가 법을 실시하여 주관적 점수를 획득하였다. 제시하는 객관적 특징 값은 주관적 점수와 높은 상관관계를 보여준다. In this paper, we propose an objective quality feature which is based on the human auditory system to measure vacuum cleaner noise. It is observed that some frequency bands are more sensitive to the human auditory system. Therefore, we divided the audible frequency range of vacuum cleaner noise into a number of frequency bands and the average energy of these bands was calculated. Among a number of average energies, an average energy of a frequency band was selected as the proposed feature. In order to test the performance of the proposed feature, fourteen vacuum cleaners were chosen and the noise was recorded in an anechoic-chamber. Then we performed subjective tests to obtain subjective scores of the noise data using the PCM (paired comparison method) and ACR (absolute category rating) subjective methods. The proposed objective quality feature shows high correlation with the subjective scores.