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Добрый вечер, уважаемые эксперты! Требуется разложить в ряд Фурье функцияю y=11*x+4 на отрезке [0,7]. Если подобное разложение уже в ответах есть, достаточно ссылки. Спасибо.
Определяем период T=7 и полупериод l=7/2, соответствующая тригонометрическая система: {cos(2n pi x/7), sin(2n pi x/7)} Вычисляем коэффициенты Фурье: a0=(2/7)[$8747$]07(11x+4)dx=(2/7)(11x2/2+4x)07=85 При n>0 an=(2/7)[$8747$]07(11x+4)cos(2n pi x/7)dx= (2/7)[11((7/(2 pi n))x*sin(2n pi x/7)+(49/(4 pi2n2))cos(2n pi x/7))+4(7/(2 pi n))sin(2n pi x/7))]07=0
bn=(2/7)[$8747$]07(11x+4)sin(2n pi x/7)dx= (2/7)[11((-7/(2 pi n))x*cos(2n pi x/7)+(49/(4 pi2n2))sin(2n pi x/7))-4(7/(2 pi n))cos(2n pi x/7)]07=-77/(pi n)
Таким образом: 11x+4 --> (85/2)-(77/pi)[$8721$]n=1[$8734$]((sin(2n pi x/7))/n)
star9491: Добрый вечер! По-моему, полупериод Вы взяли неверно. [0..7] и есть полупериод. Мы продолжаем эту функцию четным (или нечетным, по Вашему усмотрению, образом) на интервал [-7..0]. Период = 14, полупериод = 7.
lamed: Опять цитируя Фихтенгольца, если функция задана в промежутке [0;l], она разлагается в ряд по синусам или по косинусам. Коэффициенты разложения вычисляются по формулам 2/l[$8747$]0lf(x) sin n[$960$]x/l dx
Вот ссылка, где скачивала http://d.theupload.info/down/zvebmvvkjqndphbuykwwvqqzi418wvhm/fihtengolc_g_m__kurs_differencialnogo_i_integralnogo_ischisl.djvu. Если она нелегальна, скажите, я уберу.
lamed: Согласна, период равен 14. Но я и не употребляла это слово в ответе. Когда берем интеграл от -п до п, коэффициент равен интегралу деленному на п, то есть на полупериод. Здесь полупериод 7. Из-за нечетности интеграл от -7 до 7 равен удвоенному интегралу от 0 до 7. Поэтому появилась 2.
Слова "разложить функцию в ряд Фурье на отрезке" подразумевают, что периодом является длина отрезка. Если считать длину отрезка полупериодом, то формулировка задачи неполна.
Гаряка Асмик: Большое спасибо за помощь. Фихтенгольц у меня есть, изд. 1969 г., просто обратился сосед "срочно", а я, вообще-то, тугодум, да еще и "в запарке". У меня почему-то получился коэффициент другой. Где-то ошибся. Завтра буду разбираться "на свежую голову".
star9491: Нет, разлагать будем по sin nx Ф. пишет. "предположим, что функция задана лишь в промежутке [0;п]. Желая разложить ее, мы дополняем ее в промежутке [-п;0] по произволу. Дополняя нечетным образом, получим разложение только по синусам."
Гаряка Асмик: Уважаемая Гаряка Асмик. Пожалйста откройте любой серьезный учебние по анализу, где рассматриваются ряды Фурье. С самых первых строк этой теории Вы увидите, что функцию, заданную на отрезке [0;2 pi] раскладывают по тригонометрической системе {cos nx, sin nx}. Вы вырываете цитату из контекста и она лишатся полноты смысла.
В теории тригонометрических рядов для отрезка [0,b] можно рассматривать три задачи: 1) разложить в ряд Фурье, 2) разложить в ряд Фурье по синусам, 3) разложить в ряд Фурье по косинусам В первом случае период T=b (l=b/2), во втором и третьем случаях перод равен 2b (l=b).
Повнимательные посмотрите на тот ряд Фурье, который Вы привели в своем ответе. Функции, которые там стоят:
lamed: Уважаемый lamed, в одном из ваших сообщений увидел фразу:
Подумайте теперь о следующем. Пойдет Ваш сосед к Преподавателю, а он ему скажет: да не по Вашему усмотрению, а по моему желанию, господин Студент, Вы должны были разложить эту функцию по косинусам.
star9491: я так, кстати, и сделал, продолжил четным образом, и разложил по косинусам. Что до цитаты - так она из учебника (в частнсти, Бермант, Араманович).
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