Design Analysis Of a Helicopter landing Gear - Mechanical Engineering

Internal Code: IAH277

Mechanical Engineering

A landing gear is to be designed for a naval helicopter which is suitable for landing on an aircraft carrier. The motion of the aircraft carrier is an important consideration for the design. Vertical movement of the carrier due to the sea waves will cause a harder than expected landing for the pilot and has the potential to cause vibration during storage, therefore the design must allow for this to prevent damage to the helicopter. The design must also cater to diverse landing situations. You will be provided with some typical data ranges for this type of helicopter, including the mass and some of the dimensions. You will need to find any additional figures you need by research or calculations. The design criteria are deliberately open, it is up to you how many wheels you use and how you model the system in Adams/view. Simulations should be validated by hand calculations where possible. Questions: 1) The first element is to conduct research into the geometry of a typical helicopter landing gear arrangement and design a mechanism to connect the wheels to the fuselage. You should clearly justify the elements of your design. 2) The second element of the task is to specify the springs and dampers used for your particular machine. The springs and dampers must allow the helicopter to be able to land on an aircraft carrier under a range of specified conditions: 1) Normal landing – Vertical descent speed of 0.5 m/s, stationary deck, minimal acceleration and oscillations of the helicopter body to provide maximum comfort. 2) Hard landing – Vertical descent speed of 5 m/s, stationary deck, acceleration of the helicopter body must be less than 40 m/s 2 to prevent damage to the helicopter. 3) Crash landing – Vertical approach speed 15 m/s, stationary deck, acceleration of the helicopter body must be less than 200 m/s 2 to minimize injury to passengers. 4) The third element of the task is to analyse the performance of the helicopter when it is stored on the deck of the aircraft carrier. Assume that the carrier deck will move vertically is simple harmonic with an allowable amplitude and a frequency 1 Hz (6.28 rad/s) in response to the ocean waves, therefore the amplitude and resonance of your mechanism in response to this must be investigated. 5) The fourth element of the task is the modeling and simulation of the landing gear using Adams/view.