• Title, Summary, Keyword: Automobiles

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Control of SRM with Modified C-dump Converter in Cooling System of Automobiles (Modified C-dump 컨버터를 이용한 자동차 냉각시스템 SRM 제어)

  • Yoon, Yong-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.8
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    • pp.1297-1302
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    • 2017
  • Recently, SRMs are used in automobiles for power assistant steering, accessory motion control and traction drives. Especially in the motion control and traction drives, safety and efficiency are of paramount importance. The paper describes the essential elements faced in designing and constructing driving circuits for a switched reluctance motor for automobiles. An important factor in the selection of a motor and a drive for industrial application is the cost. The switched reluctance motor(SRM) is a simple, low-cost, and robust motor suitable for variable-speed as well as servo-type applications. With relatively simple converter and control requirements, the SRM is gaining an increasing attention in the drive industry. This paper presents a modified C-dump converter for Switched Reluctance Motor (SRM) machine application in the cooling system of automobiles. The experiments are performed to verify the capability of applicate control method on 6/4 salient type SRM.

The Influence of Proportion Preference in Automotive Design: Comparison Between Japanese and German Automobiles

  • Jung, Joo Young
    • Science of Emotion and Sensibility
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    • v.21 no.1
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    • pp.91-98
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    • 2018
  • The purpose of this study is to reveal concrete evidence on how aesthetic preference is applied in product design by countries. Since the 19th century, the proportion has been examined various times, and the conclusions consistently showed the strong preference for the golden ratio (1:1.618). However, previous studies are mainly focused on western products that were designed by western designers, so when the same experiment conducted for the first time in Asia with the question of 'Is the Asian subjects also likes the golden ratio?', the result clearly revealed that Korean subjects have a significant preference for the root ratio (1:1.414) and perfect square (1:1). It demonstrates that proportion preference might be different by countries, and it also influences on everyday products. Moreover, there is not enough evidence of Asian product proportions. For this reason, this study will strive to expand the knowledge on Asian aesthetic preference by focusing on Japanese automobiles that were designed and produced in Japan. 55 iconic Japanese automobiles were analyzed for proportion and compared with 50 iconic German automobiles. The result shows that Japanese automobiles have a shorter length of 7:10 (1:1.414) ratio than German automobiles with 13:23 (1:1.769) ratio. This result proves that there is the difference in preference for the proportion of Japan and Germany, and it has already influenced on automobile proportions. This result has a strong value that finding the most appropriate proportion of automotive design is a major issue in new product development, so this can be adapted to various fields of the design process where strong cultural value exists.

Comparison of Evaluation Tools of Work Posture in Automobiles Assembly Process (자동차 조립공정에 대한 작업자세 평가도구의 비교)

  • Seo, Seung‐Lock
    • Journal of the Ergonomics Society of Korea
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    • v.25 no.3
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    • pp.61-66
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    • 2006
  • Awkward work postures in workshop highly affect on work-related musculoskeletal disorders(WMSDs). Especially, in automobiles assembly process, these awkward work postures of workers may cause serious injury and illness. This study is to compare the performance among the evaluation tools which can measure the work-loads caused by the awkward work postures in automobiles assemble process. RULA, REBA and TVAL(Toyota Verification of Assembly Line) are used as the evaluation tools. The 85 jobs selected in the automobiles assembly process are applied to the three tools and their performances are analyzed after the evaluation of the work-load in each job. Through various measures of performance such as statistical test, DUNCAN test, regression test etc., the tendencies and characteristics among them are analyzed in detail.

Air Pollution by Automobiles and Ways of Reduction (자동차가 대기오염에 미치는 영향과 저감방안)

  • 김대식
    • Journal of the Korean Professional Engineers Association
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    • v.34 no.4
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    • pp.69-73
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    • 2001
  • Due to the rapid increase of automobiles and daily driving distances, air pollution by automobiles is still dominant problem of large city in spite of strict emission refutation and development of reduction technologies. Among the air pollution resources of automobile , industry. electricity generation and heating. automobile keeps 51% of total nationwide air pollution in 1998 and this proportion Is increasing in large cities from 65% to 85%. To reduce these air pollution. catalytic converter and electronic engine control, exhaust gas re-circulation and evaporative emission control system have continuously developed and applied to automobiles since 1987. Also strong emission standards and emission durability warranty have enforced and monitored annually by sampling several vehicle models. But technologies and regulations are incomplete, driver should participate in reducing air pollution for himself by planning driving, avoiding unnecessary idle and air conditioning, keeping periodic maintenance and using mass transportation.

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A Study on the Characteristics of Noise Comparison in Voice Warning System in the automobile indoors (차량실내에서 음성출력장치의 소음비교특성에 관한 연구)

  • 한영출;김대열;오상기
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.2
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    • pp.196-202
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    • 2003
  • The object of this article is to study the plausibility of applying human voice warning system to automobiles. Human voice is considered the best tool for warning system in automobiles. For the purpose of comprehending the specific characteristics of relation between noises and properties of the automobiles indoors and voice warning system researcher performed FRF test in order to examine the characteristics of voice output, and FEM simulation to learn the specific properties of the car indoors. And furthermore, surveyed the quality of voice output, using the written inquiry to examine members. The result of the study shows that it is much possible to apply voice warning system to automobiles.

A study on Chinese Consumer Behavior of Korean Automobiles (중국소비자의 한국자동차 구매의도에 관한 연구)

  • SONG, Yun-Tao;LEE, Jong-Ho
    • The Journal of Industrial Distribution & Business
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    • v.10 no.6
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    • pp.29-37
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    • 2019
  • Purpose - This study intends to analyze Chinese consumers' purchase intention of Korean automobile. The aims of this study investigated to find out how product attributes and brand image affect the consumer's purchase intention of Korean automobiles in China. We consider the product attributes, brand image as evaluation criteria, also recognized as objectives for purchase intention. This study aims to analyze the positive effects on Chinese consumers' purchase intention with the variables by using the research model. Research design, data, and methodology - Based on theory of Purchase Intention, the concept of purchase intention was assessed by two factors: a) product attributes, and b) brand image to test the proposed hypotheses. The survey was conducted for 30 days, from October 17 to November 16 in 2018. With IBM SPSS Statistics 23.0 and IBM SPSS AMOS 23.0, factor analysis and regression, Cronbach's alpha and correlation were tested. 300 samples were used for this analysis. Results - As a main result, product attributes and brand image exerted significant effects on consumer's purchase intention. Thus,

    and

    were supported. The results showed that the product attributes, brand image had positive effects on purchase intention. The findings of this thesis are as follows: Firstly, automobiles' quality factors were divided into two categories like product properties (price, performance, design, economy, and safety), and brand image (awareness, favorability, reliability, and familiarity). Second, it showed that product properties and brand image had positive impacts on purchase intention of consumer. Conclusions - The impact of product attributes and brand image on consumer perceived value of Korean automobiles in China can be seen as a universal psychology of consumers who trust automobile products such as high quality, technology, ets. The results offer some insights into the extended model and have important managerial implications for Korean automobile enterprise. As the findings of this thesis show, all strategic orientations have significant and positive effects on the ability of innovation. At the same time, automobile company must pay attention to quality. As the relationship between the automobiles' performance and brand image were positive and significant, automobile companies should have comprehensive strategic orientations focused on strengthening these factors.

Evaluation of Hydrogen Embrittlement of High Strength Steel for Automobiles by Small Punch Test (소형펀치시험을 이용한 자동차용 고강도강 수소취성 평가)

  • Park, Jae-Woo;Kang, Kae-Myung
    • Korean Journal of Materials Research
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    • v.22 no.1
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    • pp.29-34
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    • 2012
  • The hydrogen embrittlement of high strength steel for automobiles was evaluated by small punch (SP) test. The test specimens were fabricated to be 5 series, having various chemical compositions according to the processes of heat treatment and working. Hydrogen charging was electrochemically conducted for each specimen with varying of current density and charging time. It was shown that the SP energy and the maximum load decreased with increasing hydrogen charging time in every specimen. SEM investigation results for the hydrogen containing samples showed that the fracture behavior was a mixed fracture mode having 50% dimples and 50% cleavages. However, the fracture mode of specimens with charging hydrogen changed gradually to the brittle fracture mode, compared to the mode of other materials. All sizes and numbers of dimples decreased with increasing hydrogen charging time. These results indicate that hydrogen embrittlement is the major cause of fracture for high strength steels for automobiles; also, it is shown that the small punch test is a valuable test method for hydrogen embrittlement of high strength sheet steels for automobiles.

A Study on the Preference for Choosing an Automobiles according to the Demographic Characteristics (인구통계적 특성에 따른 자동차 선택의 선호도에 관한 연구)

  • Baek, Sung-Hyun;Chang, Kyung
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.30 no.1
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    • pp.25-32
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    • 2007
  • Automobile manufacturing companies should provide the products and service that can satisfy consumers who usually want various kinds of automobiles. This paper studied the relations among several demographic characteristics(gender, age, occupation, income) of consumers and automobile's attributes(engine performance, engine displacement, price, maintenance expenses, color, etc.) and preferred automobile(kind, size, company, price). For the relation research we established a model and related hypotheses and used a questionnaire survey, where 350 subjects were questioned. After the analysis, many statistically significant results are obtained : consumer's gender has relations with the preference for engine performance, engine displacement, price, color, and design; age has relations with the preference for engine displacement, maintenance expenses, free checking during A/S period, etc., occupation has relations with the preference for engine performance, engine displacement, price, maintenance expenses, fuel efficiency, etc. : income has relations with the preference for engine performance, engine displacement, price, maintenance expenses, mileage, reputation of car manufacturing companies, etc.; price and fuel efficiency has relations with the preference for car manufacturing companies. These results suggest the consumer-oriented sales of automobiles and are expected to be helpful for the effective strategy development of automobile marketing.

An Empirically Comparative Study on the Purchasing Attitude to Korean Automobiles of American, Chinese and Indian Consumers : Focusing on Hyundai Automobile (미(美)·중(中)·인(印) 소비자들의 한국 자동차 구매태도에 관한 비교연구 : 현대 자동차를 중심으로)

  • Yoon, Seong-Hwan
    • International Area Studies Review
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    • v.14 no.1
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    • pp.161-181
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    • 2010
  • This thesis researches how country image and product attributes as well as brand personality influence U.S.A, Chinese and Indian Consumers' Korean automobile brand selection and the strategic implications of this study are as follows. First, Country image and Brand personality have more influence on U.S.A Consumers than Chinese and Indian consumers on selection of Korean automobiles. Second, All three of consumers have more influence by product attributes than other two factors, Chinese consumers has more influences by product attributes than U.S.A and Indian consumers have. Throughout this study it can be acutely recognized that brand personality and product attributes as well as country image influence on selection of automobiles made in Korea although there exist differences among three other consumers. This study suggests Hyundai automobiles in U.S.A, China and India need effort to develop representative brands with a unique personality.

Image Analysis of Korean Automobiles Using Sensory Engineering (감성공학을 이용한 국산 승용차 이미지 분석)

  • Lee Jin-Choon;Hong Seong-Il
    • Journal of the Korea Industrial Information Systems Research
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    • v.11 no.2
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    • pp.69-78
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    • 2006
  • This paper is concerned with analyzing the images of Korean automobiles using, so called, sensory engineering, which adapts the sensory and subjective assessment of human beings in evaluating the quality of product. The methodology of analysis is suggested in this paper according to the following steps. First, 14 pairs of adjectives, which describe the image of object cars in view of the semantic differential method, are derived from consulting with several expert panels. Nextly, factor analysis is performed in order to obtain the axises, by which the images space of the object automobiles are specified, and then the images of the object automobiles are measured by the coordinate of all the object automobiles in the image space. In this paper, a sensory estimation experiment is performed to a panel consisting with In undergraduate students residing in the region of Daegu. From the result of analysis of this paper, target images, which the automobile manufacturers are intended, are achieved by and large except one company.

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