• 한국자동차공학회논문집
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• 제16권4호
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• pp.120-127
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• 2008

A military vehicle undergoes normal to extreme driving conditions, which consequently induce the fatigue and fracture of cabin and frame. So, it is important to estimate the fatigue life of two components at an initial design stage. In this paper, Modal Superposition Method(MSM) was applied to evaluate the durability performance of a small-sized military truck. For reliable durability analysis, a Virtual Test Lab(VTL) Model was established by correlation with experimental results. These data were extracted from actual driving test, modal test, and SPMD(Suspension Parameter Measuring Device) test. This process shows that Virtual Fatigue Analysis can be a useful approach in the development of military vehicles as well as commercial vehicles.

• Safety and Health at Work
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• 제14권3호
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• pp.340-346
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• 2023

Background: Truck driving is a highly sedentary occupation that places workers at risk for chronic health conditions, such as obesity and high blood pressure. The primary purpose of this study was to objectively describe truck drivers' typical physical activity (PA) patterns. Methods: We used ~7-10-day baseline PA actigraphy data samples from drivers in the Safety & Health Involvement For Truckers (SHIFT) study (n = 394). Driver PA patterns (e.g., average number of ≥10 minute Freedson bouts per week, time in bouts, and common days/times for PA) were summarized with descriptive analyses. We also compared objective accelerometer data to self-reports. Results: Drivers' weekly PA averaged 14.4 minutes (SD = 37.0), and most PA occurred between 5-6 pm on Tuesdays and Wednesdays. Drivers overestimated self-reported weekly exercise by over 60 min/week compared to accelerometer data. Conclusion: Our results suggest that objective PA assessment may be warranted over self-report when possible, and timing may be key in future PA intervention work with truck drivers.

• 한국포장학회지
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• 제15권3호
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• pp.77-81
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• 2009

음료와 맥주 제품의 경우 신선도를 유지하기 목적으로 다양한 종류의 유리병이 국내에서 생산되거나 수입되어 유통되고 있다. 실제 트럭으로 국내 운송되는 맥주 유리병 제품의 유통환경에서 진동 특성을 분석하고 이를 바탕으로 트럭 불규칙 진동 특성인 0.52 $G_{rms}$을 진동시험 규격으로 적용하여 예측실험을 실시하였으며, 결론적으로 유리병의 자체의 파손은 관측되지 않았다. 트럭의 적재함 위치별 상하진동 수준에 있어서는 뒷부분에 위치한 가속도계에서 가장 큰 진동 특성(0.17 $G_{rms}$)이 나타났으며, 앞 부분(0.11 $G_{rms}$)과 중간 부분(0.12 $G_{rms}$)은 큰 차이를 보이지 않았다. 낙하 높이와 제품 용량의 종류에 관계없이 바닥면으로 낙하된 유리병의 경우 파손은 관측되지 않았다. 단측면 낙하 시 가장 큰 유리병 파손율을 보였으며, 장측면에 비해 약 2배 높은 유리병 파손율을 나타내었다.

• 한국자동차공학회논문집
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• 제20권3호
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• pp.13-19
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• 2012

The fatalities rate for passenger vehicles, vans, and commercial vehicles is 1.23, 1.90 and 2.46 deaths per 10,000 registered vehicles, respectively. This shows that vans and commercial vehicles are vulnerable compare to passenger vehicles. To evaluate the crashworthiness of van and Light Truck Vehicle(LTV), we carried out frontal offset crash test at 64km/h, 40% overlap as per IIHS(Insurance Institute for Highway Safety). The test result show that LTV is very poor to protect occupant at frontal crash cause there is no safety system such as airbag and pretensioner and front end length(distance from front bumper to steering wheel) is short. One of the van rated as the lowest rating even it is equipped with airbag, cause its safety cage was collapsed during the test. This result shows that the structural integrity is very important in terms of occupant protection.

• 제어로봇시스템학회논문지
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• 제14권5호
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• pp.496-501
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• 2008

Recently, many automotive companies tend to apply an air quality system (AQS), which prevents polluted air such as smoke or dust by controlling air intake actuator of vehicle, to satisfy the consumer's need for agreeable in-vehicle environment. However, performance of the traditional AQS is not satisfactory because a polluted air may enter into the inside of vehicle through the breaks of windows. Especially, the commercial vehicles such as bus or truck need to be prevented polluted air from the breaks of vehicle. Hence, as an alternative to the traditional AQS, this paper presents the architecture of smart AQS for commercial vehicle and implementation of the smart AQS. Also, the performance of the suggested system is evaluated through an experimental testbed.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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• pp.34-39
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• 2001

The median barrier is one of the roadside hardware to prevent severe human and property damage from highway traffic accidents. The foreign standard of concrete median barrier was introduced and implemented without modification fitting to domestic vehicle and highway condition. In a car accident, median barrier doesn't protect vehicle effectively, especially for heavy vehicle such as bus and heavy truck. The purpose of this study is to develop the optimal performance design of concrete median barrier using the design of experiment with crash simulation analysis which is done by Pam-Crash that is one of the commercial crash simulation software. As a result of this study, an optimal design of concrete median barrier is obtained considering von Mises stress, volume and COG acceleration of truck.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.91-92
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• 2006

• International Journal of Advanced Culture Technology
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• 제6권3호
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• pp.105-116
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• 2018

As an international company in the automotive industry for years, Sichuan Hyundai has encountered serious difficulties since its entering into China. With huge investment and great ambition to conquer the China commercial vehicle market, successive setbacks have put the company in jeopardy. Design thinking, emphasizing "user-driven innovation" can help to look for effective and possible solutions from a very strong and effective perspective. This thesis first provides a comprehensive look of the economic background of China in order to get a overall understanding of the market. Then the paper did an analysis of Sichuan Hyundai from the perspective of design thinking. By identifying the reliability bias of Sichuan Hyundai, key problems such as the product, advertisement and cultural communication were discussed. With a emphasis on the intuitive thinking, the paper provides some feasible solutions and also implications for the future development.

• 산업기술연구
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• 제23권A호
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• pp.15-20
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• 2003

Stochastic simulation technique has advantages over deterministic simulation in various engineering analysis, since stochastic simulation can take into consideration of scattering of various design variables, which is inherent characteristics of physical world. In this work, Monte-Carlo simulation mothod in ADAMS/Insight for steady-state cornering and J-turn behavior of a truck with design variables like hard points and busing stiffnesses have performed to achieve better dynamic performance. The main purpose is to improve understeer gradient at steady-state cornering and minimize peak lateral acceleration and peak yaw rate at J-turn. Through correlation analysis, design variables that have high impacts on the cornering behavior were selected, and significant performance improvement has been achieved by appropriately changing the high impact design variables.

• 한국자동차공학회논문집
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• 제25권1호
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• pp.103-110
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• 2017

Most commercial vehicles have adopted the hydraulic power steering system. To reduce fuel consumption and to improve steering controllability, a hybrid electric power steering system is being developed for commercial vehicles. In this study, the HILS (Hardware In the Loop Simulation) system equipped with a commercial vehicle hybrid electric power steering system was developed and the vehicle dynamic performance of a truck with the steering system was evaluated. The hybrid electric power steering system is composed of the EHPS motor pump, column mounted EPS system, and ball nut steering gear box for heavy commercial vehicles. The accuracy of vehicle models equipped with the HILS system was verified with comparisons between the simulation results and field test results. The road reaction forces of the steering system were generated from the vehicle model and verified using field test results. Step steering tests using the verified HILS system were carried out and the performance of a newly developed commercial vehicle hybrid electric power steering system was evaluated.