For thousands of years mankind has been engaged in the design history. Early in the design and manufacture and are not separated, such as the ancient craftsman design conceived by the method side edge made its work, this time in the design experience, inspiration thinking stage, has not yet developed into a science. Since the 20th century, with the development of systems engineering and computer technology, designed gradually to a scientific evolution Into the 1960s, there has been a clear division of the design process for the product definition, design, technical design, detailed design 4 stage. Design is no longer rely on the experience and inspiration to create art, and further evolve into a knowledge-based, scientific method as a means of engineering innovation. Which directly affects the design cost, reliability, security, and performance, plays an important role in product design.

Design is part of this: that the mandate's book (product definition) later, through abstraction, the establishment of a functional structure, seek appropriate action principle and is determined by combining the original understanding. It is mainly divided into two steps: First, to produce more programs, the second is a multi-program evaluation.

Ambulances often used for transporting patients or severely disabled person, in order to avoid deterioration of the patient's condition, often the root of the velocity is low, leading to delay the best treatment time and patient transit inevitably some deterioration, for which it has been made various attempts.

In theory, a perfect ambulance stretcher should be suspended in six degrees of freedom of the patient from the road surface uploaded to the vibration completely isolated: 3 direction of rotation, three linear directions. But really very difficult to fully implement, so the first people on the road vibration vibration simply be seen as the vertical direction, the degree of freedom to design a single suspension. Later, it was four degrees of freedom to design the damping device, but the cost and very expensive. This paper attempts to find a compromise solution through appropriate scientific design.

Product design requirements

1) can automatically control the amplitude and pitch suspension amplitude;

2) design for different ambulance good versatility;

3) Easy to install, adjust;

4) the system itself is light weight;

5) the price is moderate;

6) for patients of different body weight have good adaptability.

Determine the total abstraction function

Abstract aims to omit personality and chance, get rid of some unnecessary requirements or desires, universally applicable and highlight the nature of things. Thereby determining the total function and essential constraints, where the main purpose of our products is designed to make the patient comfortable, that is ultimately the product of the most significant input vibration isolation. So the total function of the product is; reduce vibration.