UNIVERSITI SAINS MALAYSIA EEM 352 REKABENTUK MEKATRONIK II

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UNIVERSITI SAINS MALAYSIA Peperiksaan Semester Pertama Sidang Akademik 2011/2012 Januari 2012 EEM 352 REKABENTUK MEKATRONIK II Masa : 2 Jam Sila pastikan bahawa kertas peperiksaan ini mengandungi TUJUH muka surat beserta Lampiran TIGA muka surat bercetak sebelum anda memulakan peperiksaan ini. Kertas soalan ini mengandungi EMPAT soalan. Jawab TIGA soalan. Mulakan jawapan anda untuk setiap soalan pada muka surat yang baru. Agihan markah bagi setiap soalan diberikan di sudut sebelah kanan soalan berkenaan. Jawab semua soalan dalam Bahasa Malaysia atau Bahasa Inggeris atau kombinasi keduaduanya. [Sekiranya terdapat sebarang percanggahan pada soalan peperiksaan, versi Bahasa Inggeris hendaklah diguna pakai]. In the event of any discrepancies, the English version shall be used. 2/-

- 2 - [EEM 352] 1. Anda dikehendaki untuk merekabentuk robot pendaki tali untuk satu pertandingan. Jarak perjalanan yang diperlukan bagi robot ialah 177 seperti ditunjukkan dalam Rajah 1. Jumlah berat robot keseluruhan ialah 1 kg. Sasaran masa untuk menamatkan pendakian ialah 4 saat. You are required to design a rope climbing robot for a competition. The distance that the robot has to travel is 177 as shown in Figure 1. The total weight of the robot is 1 kg. The target time to complete the climb is 4 seconds. Syarat Pertandingan: Competition Tasks: Syarat 1 - Robot mesti mendaki tali sejauh 4.5 meters (177 ). Rule 1 - The robot shall climb the rope for 4.5 meters (177 ). Syarat 2 - Robot mesti berhenti mendaki apabila menyentuh plat bulat. Rule 2 - The robot shall identify and stop the climbing actions when the robot touches the round plate. 177.00 132.5 197.00 Rajah 1 Figure 1 3/-

- 3 - [EEM 352] Bincangkan secara lengkap isu-isu berikut:- Discuss in detail the following issues:- (i) (ii) Analisa statik dan dinamik. Static and dynamic analyse. Mekanisma dan rekabentuk robot. Mechanism and robot design. (20 markah/marks) (30 markah/marks) (iii) Motor, penderia, mikropengawal, skematik lengkap dan kod program. Motors, sensors, microcontroller, detailed schematic and program code. (50 markah/marks) 2. (a) Terangkan penyediaan satu pin mikropengawal PIC sebagai masukan, keluaran dan tarik-naik lemah. Lukis gambarajah blok bagi pin tersebut. Explain the setting up of a pin of a PIC microcontroller as input, output and weak pull-up. Draw the block diagram of the pin. (20 markah/marks) (b) Lukiskan litar antaramuka mikropengawal bagi 4 peranti masukan dan 6 peranti keluaran. Draw the microcontroller interface circuits for 4 input devices and 6 output devices. (20 markah/marks) 4/-

- 4 - [EEM 352] (c) Terangkan sebab-sebab mikropengawal digunakan untuk rekabentuk sistem mekatronik. Explain the reasons for using microcontroller for mechatronic system design. (20 markah/marks) (d) (i) Lukis skematik untuk mengawal satu servo menggunakan mikropengawal, PIC16F84. Draw the schematic to control a servo using microcontroller, PIC16F84. (5 markah/marks) (ii) Tulis satu program untuk mengawal servo tersebut dengan 40% kitar tugas menggunakan bahasa perhimpunan. Write a program to control the servo with 40% duty cycle using assembly language. (20 markah/marks) (iii) Tulis satu program untuk mengawal servo tersebut dengan 40% kitar tugas menggunakan bahasa PIC Basic Pro. Write a program to control the servo with 40% duty cycle using PIC Basic Pro language. (15 markah/marks) 5/-

- 5 - [EEM 352] 3. (a) Pertimbangkan pengawal PID elektronik dalam Rajah 2. Tentukan nilai-nilai R 1, R 2, R 3, R 4, C 1 dan C 2 pengawal tersebut apabila rangkap pindah G c (s)= E o(s) E i (s) adalah bersamaan dengan Consider the electronic PID controller shown in Figure 2. Determine the values of R 1, R 2, R 3, R 4, C 1 and C 2 of the controller such that the transfer function G c (s)= E o(s) E i (s) is G c (s) = 39.42 ( 1 + 1 3.077s + 0.7692s ) (s+ 0.65)2 = 30.3215 s Rajah 2 Figure 2 (60 markah/marks) 6/-

- 6 - [EEM 352] (b) Terangkan dengan jelas langkah kaedah untuk Explain the step by step method of (i) (ii) Talaan PID gelung-buka Ziegler - Nichols Ziegler Nichols open-loop PID tuning Talaan PID Cohen - Coon PID Cohen Coon PID tuning (40 markah/marks) 4. (a) Tunjukkan bahawa sistem terkawal PID yang ditunjukkan dalam Rajah 3(a) adalah bersamaan dengan sistem I-PD dikawal dengan kawalan suap depan yang ditunjukkan dalam Rajah 3(b). Show that the PID-controlled system shown in Figure 3(a) is equivalent to the I-PD-controlled system with feedforward control shown in Figure 3(b). Rajah 3 Figure 3 (50 markah/marks) 7/-

- 7 - [EEM 352] (b) Dengan menggunakan penguat kendalian, tentukan rekabentuk untuk s + 55.92 s + 0.5 pengawal PID, G c s =. Anda dibekalkan dengan s pemuat-pemuat bernilai 0.1 µf dan 5.59 µf, beserta beberapa perintang. Design the PID controller of G c (s) = (s+ 55.92)(s+ 0.5) s by using operational amplifiers. You are provided with 0.1 µf and 5.59 µf capacitors, with several resistors. (50 markah/marks) -ooooooo-

[EEM 352] Lampiran 1 Appendix 1 PIC16F84 PIC16F877 1

[EEM 352] Lampiran 2 Appendix 2 2

[EEM 352] Lampiran 3 Appendix 3 PicBasic Pro commands 3