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INSTRUCTION: This section consists of SIX (6) essay questions. Answer FOUR (4) questions only. ARAHAN: Bahagian ini mengandungi ENAM (6) soalan esei. Jawab EMPAT (4) soalan sahaja. QUESTION 1 SOALAN 1 a) Explain and sketch the suspension and balancer methods to determine the centre of gravity for vehicle. Nyatakan dan lakarkan kaedah gantungan dan keseimbangan yang digunakan untuk menentukan kedudukan pusat graviti kenderaan. [10 marks] [10 markah] b) With an aid of a diagram produce derivation to get h c when vehicle is descending the hill with the angle given α. Dengan bantuan gambar rajah, terbitkan formula untuk mendapatkan hc apabila sebuah kenderaan sedang menuruni bukit pada kecondongan sudut α. [15 marks] [15 markah] QUESTION 2 SOALAN 2 (a) (b) Describe the meaning of ride for vehicle. Jelaskan apakah yang dimaksudkan pemanduan pada sesebuah kenderaan. Sketch and label FOUR (4) types of various harmonic of non-uniformities radius. Lakar dan labelkan EMPAT (4) jenis pelbagai harmonik pada ketidakseragaman jejari roda. [8 marks] [8 markah] 2 SULIT

(c) Define the difference between first harmonic, second harmonic and higher order radial. Tentukan perbezaan antara harmonik pertama, kedua harmonik dan susunan jejarian tinggi. [11 marks] [11 markah] QUESTION 3 SOALAN 3 (a) List down THREE(3) differences between radial and bias-ply tyres. Nyatakan TIGA(3) perbezaan antara tayar radial dan bias-ply. [6marks] [6markah] (b) Based on Figure 1, find the deflected zone area of the tyre for the following case : Merujuk pada gambar Rajah 1, cari luas kawasan pesongan tayar bagi kes-kes berikut: Figure 1 Rajah 1 (i) At full contact, ϒ = 0 ; Pada sentuhan penuh, ϒ = 0 ; (ii) At full contact, ϒ = 30 ; Pada sentuhan penuh, ϒ = 30 ; 3 SULIT

(iii) At partial contact, ϒ = 30 if rsr =135 mm ; Pada sebahagian sentuhan, ϒ = 30 jika rsr =135 mm ; [9 marks] [9 markah] (c) With an aid of a diagram, explain the contact point of both the full and partial contacts. Dengan bantuan gambar rajah, terangkan titik sentuhan bagi keseluruhan dan separa sentuhan. [10 marks] [10 markah] QUESTION 4 SOALAN 4 Given that a vehicle has the following specifications; Net weight = 2495 kg Wheelbase = 3570 mm Assume the car is parked on an uphill road and the distance of front & rear wheels centre are the same to the centre of gravity. The height of the centre of mass to the road surface is h = 670 mm φ = 30 deg. Diberikan spesifikasi sebuah kenderaan adalah seperti di bawah ; Berat bersih = 2495 kg Bes roda = 3570 mm Anggap kenderaan ini berhenti meletak kenderaan di jalan curam dan jarak roda depan dan belakang adalah sama kepada pusat gravity. Tinggi jisim pusat kepada permukaan jalan adalah h = 670 mm φ = 30 deg. 4 SULIT

C3 C3 a) Sketch the free body diagram of the vehicle. Show all the forces acting in the system. Lakar rajah badan bebas sebuah kenderaan. Tunjukkan semua daya yang bertindak pada kenderaan ini. b) By using the free body diagram, show the forces under the wheels of the car if its handbrake is only applied to the rear wheels. Dengan menggunakan rajah badan bebas, tunjukkan daya di bawah roda sekiranya kenderaan tersebut menggunakan brek tangan untuk roda belakang sahaja. [15 marks] [15 markah] c) Explain what it means by tilting angle. Huraikan apa yang dimaksudkan dengan sudut mencondong. [4 marks] [4 markah] QUESTION 5 SOALAN 5 CLO3 (a) Describe briefly about kinematic tyre model. Terangkan secara ringkas tentang model tayar kinematik. CLO3 C3 CLO3 (b) (c) Calculate the space requirement of a typical passenger car if the wheelbase and width of the vehicle are 2.5 m and 1.6 m. The distance from the front of the vehicle to the front axle is specified as 1.0 m. Kirakan keperluan ruang bagi kenderaan penumpang jika jarak roda dan lebar kenderaan masing-masing adalah 2.5 m and 1.6 m. Jarak dari bahagian hadapan kenderaan ke gandar hadapan ialah 1.0 m. R = (Rmin + b)² + (a + f)² - Rmin State SIX(6) factors that affect the cornering stiffness of a vehicle. Nyatakan ENAM(6) faktor yang mempengaruhi cornering stiffness bagi kenderaan. 5 SULIT

CLO3 (d) With an aid of a diagram, explain how to find steering angle needed to negotiate a turn at a given constant radius for two axles vehicle in a low speed turn. Dengan bantuan gambar rajah, terangkan bagaimana untuk mencari sudut stereng supaya menepati turn pada radius malar bagi dua gandar kenderaan dalam kelajuan rendah. [7 marks] [7 markah] QUESTION 6 SOALAN 6 CLO 3 (a) The Figure 2 below shows steering angle (deg) vs time(s) graph for step steer input. Describe FIVE (5) characteristics for step steer input. Graf 1 di bawah menunjukkan graf sudut stereng(deg) melawan masa(s). Huraikan LIMA (5) ciri-ciri bagi step steer input. [10 marks] [10 markah] Figure 2 Rajah 2 CLO 3 (b) Based on Figure 3, Figure 4, Figure 5 and Figure 6 below, Fill in the blanks the right terms for the graphs of step steer input below: Merujuk kepada Rajah 3, Rajah 4, Rajah 5 dan Rajah 6 di bawah, isikan tempat kosong dengan istilah/label yang betul bagi graf step steer input di bawah: [8 marks] [8 markah] 6 SULIT

i) ii) Figure 3 Rajah 3 iii) iv) Figure 4 Rajah 4 7 SULIT

v) vi) Figure 5 Rajah 5 vii) viii) Figure 6 Rajah 6 CLO 3 (c) From the Figure 7 of the influences on the driving behaviour at steady state cornering on a 100 m radius below, distinguish the semi-trailing arm, single wishbone and trailing arm in the usage of rear axle for a passenger car. Daripada Rajah 7 di bawah, bandingkan penggunaan semi-trailing arm, single wishbone dan trailing arm sebagai gandar belakang bagi sesebuah kenderaan. [7 marks] [7 markah] 8 SULIT

Single wishbone Semi trailing arm Trailing arm Figure 7 Rajah 7 QUESTION END SOALAN TAMAT 9 SULIT