이공학도를 위한 음향학 이론의 핵심 > 대학 교재

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대학 교재

이공학도를 위한 음향학 이론의 핵심

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책소개

우리 생활과 밀접한 관련이 있는 음파를 다루는 학문인 음향학은 물리학을 기초로 하는 융합 학문이다. 따라서 음향학 이론에는 이학인 물리뿐만 아니라, 기계, 전기 및 전자, 신호처리 등 공학 분야에서 기초가 되는 개념 및 이론이 많이 포함되어 있다. 음향학에 흥미를 느끼고 공부하고자 하는 사람 또는 장차 음향 관련 분야에 종사하고자 하는 사람들은 필히 그러한 개념 및 이론을 포함하는 기본적인 음향학 지식을 갖추어야 한다. 그중에서도 특히, 이학이나 공학을 전공으로 하는 학생은 음향학 이론에 대한수학적 표현에 익숙해야 한다. 그런데 현재 시판 중인 책 중에는 한글로 된 음향학 이론 관련 책이 거의 없다. 따라서 학생들은 주로 원서로 된 책으로 공부하고 있는 실정이다.


저자들은 오랫동안 대학에서 음향학 및 그 관련 과목을 강의해 오고 있는데, 강의용 교재로 사용하기에도 적합한 한글 교재가 없어 어려움을 겪고 있다. 음향학에 대한 강의는 국내 일부 대학에서만 행해지고 있는데, 대학에서 처음으로 음향학을 접하는 학생의 관점에서 보면 그 내용이 다소 생소하여 이해하는 데 어려움을 겪고 있다. 특히 고교 때나 대학 입학 후에라도 수학이나 물리학을 제대로 공부하지 않은 학생들에게는 그 생소한 내용을 수식 위주로 설명하고 있는 음향학 이론이 어렵게

느껴질 것이다. 더욱이 그 강의 교재가 영어 등의 외국어로 되어있다면 더욱 어려움을 느끼게 될 것이다. 이에 저자들은 국내 대학의 학부 학생, 특히 이공계 분야의 학부 학생들이 음향학의 기초 이론을 학습하기에 편리하도록 이 책을 저술하고자 하였다.


음향학은 종합 학문인 만큼 다루는 내용이 매우 광범위하다. 따라서 책에 따라 포함된 내용이 전혀 다를 수 있다. 그러나 당연한 말이지만 음향학의 기본 이론은 다를 수가 없다. 이 책에는 음향학에서 가장 기초가 되는 기본 이론에 대해 기술되어 있다. 그 기본 이론은 진동, 파동, 파형 해석 등을 포함한다. 그 이론을 기술하는데 있어서는 수학이나 물리의 기초지식이 부족한 학생들이 스스로 쉽게 학습할 수 있도록 해야 한다는 방침에 따라 대부분의 수식을 상세히 유도해 두었다. 따라서 처음부터 차근차근 읽으면서 학습해 나간다면 큰 어려움 없이 모든 내용을 이해하고, 수식에도 친숙해질 것으로 생각한다. 그럼에도 불구하고 이해가 되지 않는 부분이 있다면 그에 대한 다른 문헌을 참고하기 바란다. 부디 이 책이 음향학을 공부하고자 하는 학생 등 독자에게 작으나마 도움이 되기를 바란다.

목차

CHAPTER 01 서 론

1.1 음파의 분류 ·························································································· 1

1.2 소리의 3요소 ························································································ 4

1.3 음향학에서의 기본 3가지 물리량 ························································ 5

1.4 데시벨(dB)의 정의 ················································································ 7


CHAPTER 02 진 동

2.1 단조화 진동 ························································································ 11

2.2 초기 조건에 따른 단조화 진동의 해 ················································ 16

2.3 단조화 진동의 다른 예 ······································································ 19

2.4 감쇠 진동 ···························································································· 23

2.5 강제 진동 ···························································································· 32


CHAPTER 03 탄성률, 음속 그리고 음향 임피던스

3.1 변형력과 변형률 ················································································· 47

3.2 탄성률 ································································································· 48

3.3 탄성률과 음속 ···················································································· 53

3.4 음향 특성 임피던스 ··········································································· 56


CHAPTER 04 파 동

4.1 평면 진행파 ························································································ 61

4.2 음향 파워, 음향 강도 및 음향 에너지 ············································· 65

4.3 파동의 중첩 ························································································ 71

4.4 정상파 ································································································· 76

4.5 파동방정식과 그 해 ··········································································· 85

4.6 진행파 방정식 ·················································································· 100


CHAPTER 05 반사와 투과

5.1 줄에서의 펄스파 반사와 투과 ························································· 103

5.2 유체에서 음파의 반사와 투과 ························································· 108


CHAPTER 06 구면파의 전파와 음장

6.1 구면파의 특성 ·················································································· 125

6.2 호흡구로부터 구면파의 방사 ··························································· 130

6.3 음향 쌍극자의 음파 방사 ································································ 132

6.4 선음원에서의 음파 방사 ·································································· 136

6.5 피스톤형 음원에서의 음파 방사 ····················································· 141


CHAPTER 07 파형 분석

7.1 주기파의 주파수 해석 - 푸리에 급수 ············································ 159

7.2 복소 푸리에 급수 ············································································· 170

7.3 비주기파의 주파수 해석 - 푸리에 변환 ········································ 172

저 자
소 개

하강렬

1978. 2 부산수산대학 학사

1982. 8 부산수산대학 석사

1990. 3 일본 도호쿠(東北)대학 박사

1991. 3~현재 부경대학교 물리학과 교수


김무준

1985. 2 부산수산대학 학사

1990. 2 부산수산대학 석사

1994. 3 일본 도호쿠(東北)대학 박사

1995. 3~현재 부경대학교 물리학과 교수


팽동국

1991. 2 한양대학교 학사

1993. 8 한양대학교 석사

1997. 9 미국 MIT 석사

2002. 8 미국 펜실베니아 주립대학(Penn State Univ.)박사

2003. 5~현재 제주대학교 해양시스템공학과 교수