Field ambulance to transport the wounded. The complexity of traffic conditions. Limited by the modification of the vehicle type chassis, the riding comfort lying wounded by a greater impact. In order to control the vibration of the carriage at the lowest level, improve inside the stretcher bracket and other important equipment of smooth and wounded for ride comfort of supine body requires quadratic damping of stretcher support by appropriate isolation device. We equipped with double stretcher bracket of a field ambulance specially developed new type of magneto rheological vibration isolation device and wire rope vibration isolator, and is installed on the two sets of the same sample. Through the test of the vehicle sports car, we compared the vibration isolation effect of the 2 vibration isolation devices.

Vibration isolation is an increase of flexible link between 2 structures, which can reduce the transfer force or displacement of first structures to second structures, which is called vibration isolation device or damping device. Steel wire rope vibration isolator as a passive nonlinear vibration isolation buffer element with variable stiffness characteristic, variable damping characteristics, multidirectional elastic deformation, impact resistance, high temperature resistance, the use of vehicle instrument commonly used isolation element long life, installation ways the advantages and. The magneto rheological vibration isolation device is a new type of semi-active control device, which can change the shear stress of the damping fluid through an external controllable magnetic field. Therefore, the stiffness and the damping force of the vibration isolation device can be automatically adjusted, which has the advantages of low energy consumption, wide adaptation frequency range, obvious damping effect, etc..

Through the medium field wounded transport stretcher bracket using different isolation device of prone position and posture of the sick and wounded isolation effect contrast experiment was conducted to study, you can get the following conclusions:

(1) on the whole, the magnetic rheological vibration isolation device plays a significant role in the vibration isolation of the stretcher support. It is particularly prominent in the 4~8Hz range of the vibration sensitive frequency of the human body.

(2) the effect of the vibration isolation device of the wire rope vibration isolation device is not obvious, the transfer function is basically greater than 4 in the range of 1 ~ 8 Hz, and even plays a role in the amplification.

(3) from the transfer function characteristic curve can be seen, magnetorheological vibration isolator in spite of vibration isolation effect is obvious, but sometimes separated efficiency of vibration is small. In some pavement limit cases not even to isolation effect, indicating that the vibration isolation device still need further improvement, optimizing the structure of the damping coefficient and the coefficient of spring magnetorheological vibration isolator as a new semi active control isolation device, with the traditional passive control of wire rope isolator is compared. Isolation effect is obvious, suitable for field medical vehicle important equipment, facilities, secondary isolation.