Đang tải... (xem toàn văn)
đồ ángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrsángrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrgggggggggggggggggggggggggggggggggggggggggggggggggggggggrs
BỘ GIÁO DỤC VÀ ĐÀO TẠO TRƯỜNG ĐẠI HỌC VINH () ĐỒ ÁN THIẾT BẾ BỘ ĐIỀU KHIỂN CHO HỆ THỐNG LÒ NHIỆT Giảng viên hướng dẫn : Ths Phan Văn Dư Sinh viên thực : Nguyễn Văn Anh 165TDV200340 : Nguyễn Văn Đạo Lớp : 57KTĐK& Năm học: 2018-2019 165TDV200346 Chương : Tìm hiểu đối tượng Giới thiệu chung - Lò nhiệt hay lò điện hở thiết bị biến nhiệt thành điện dùng q trình cơng nghệ khác • Một số lò nhiệt thực tế Hình 1.1: Lò bánh mỳ Hình 1.3Lò xi măng Hình 1.2 Lò vi sóng Hình 1.4 Lò ấp trứng + Cơng dụng Lò bánh mỳ (hình 1.1): Dùng nhiệt độ cao để nướng bánh mỳ Lò vi sóng (hình 1.2): Dùng nhiệt độ cao để nấu chín hâm nóng thức ăn nhiệt độ lên đến 250 Lò xi măng (hình 1.4): Dùng nhiệt đọ cao 1000 để nung đất sét phụ gia để tạo xi măng Lò ấp trứng (hình 1.4): Dùng nhiệt độ để ấp trứng, nhiệt độ thấp 40 Thơng số kỹ thuật lò bánh mỳ Tùy vào lò mà thơng số kỹ thuật khác Đối với lò khay - Để điều khiển đối tượng dựa vào điều khiển PID mờ * Bộ điều khiển PID sử dụng rộng rãi nhờ khả triệt tiêu sai số xác lập, tăng đáp ứng độ, giảm vọt lỗ tham số điều khiển Hàm truyên lt điều khiển PID có dạng: (1.1) Trong đó: Kp- hệ số khuếch đại tỉ lệ Kd- hệ số khuếch đại vi phân Ti- thời gian tích phân Td- thời gian vi phân Ki- hệ số khuếch đại vi phân • Xét đối tượng: - Với hệ thống lò nhiệt ta cần ý đầu vào đầu hệ thống Do lò biến điện thành nhiệt năng, ta có đầu vào lò điện áp (hay cơng suất) cung cấp cho điện trở đầu nhiệt độ bên lò r(t) c(t) G(s) Ta xác định hàm truyền gần lò nhiệt theo định nghĩa : (1.2) Do tín hiệu vào hàm nấc đơn vị (cơng suất=100%) (1.3) G Tín hiệu gần hàm C(t)=f(t - L) Trong Theo định nghĩa biến đổi laplace f(t-x)1(t-α) là: (1.4) Đặt T1 =t – 2, ta có: dT (1.5) => Mặt khác Trong lấy laplace hàm dt (1.6) Vậy hàm truyền lò nhiệt là: (1.7) ... lò nhiệt thực tế Hình 1.1: Lò bánh mỳ Hình 1.3Lò xi măng Hình 1.2 Lò vi sóng Hình 1.4 Lò ấp trứng + Cơng dụng Lò bánh mỳ (hình 1.1): Dùng nhiệt độ cao để nướng bánh mỳ Lò vi sóng (hình 1.2): Dùng... măng Lò ấp trứng (hình 1.4): Dùng nhiệt độ để ấp trứng, nhiệt độ thấp 40 Thơng số kỹ thuật lò bánh mỳ Tùy vào lò mà thơng số kỹ thuật khác Đối với lò khay - Để điều khiển đối tượng dựa vào điều