GB/T 4971-2009Terms and definitions for automotive ride comfort (English PDF)

2.1 Basic terms and definitions

2.1.1

It provides passengers with a comfortable and pleasant riding environment and convenient operating conditions. Comfort includes.

a) Ride comfort;

b) Noise in the car;

c) Air conditioning performance (temperature, humidity, air flow, etc.);

d) Riding environment (activity space, internal equipment, layout, decoration, height of pedals, width of doors and passages, etc.);

e) Driving performance (portability of driving operation, legibility of instruments and signal equipment, etc.).

2.1.2

Avoid the vibration and impact generated by the car during the driving process that make people feel uncomfortable, fatigue, or even damage health, or damage the goods performance.

Note: Ride comfort is one of the main contents of comfort.

2.2 Types of vehicle vibration

2.2.1 A straight line vibration along the car's X axis (see Figure 1).

2.2.2 A straight line vibration in the direction of the car's Y axis (see Figure 1).

2.2.3 Straight line vibration in the direction of the car's Z axis (see Figure 1).

2.2.4 Angular vibration around the car's X axis (see Figure 1).

2.2.5 Angular vibration around the car's Y axis (see Figure 1).

2.2.6 Angular vibration around the car's Z axis (see Figure 1).

2.3 Types of human body vibration

2.3.1 Vibrate in a straight line along the front and back direction of the human body (see X direction in Figure 2).

2.3.2 Vibrate in a straight line along the left and right directions of the human body (see Figure 2 Y direction).

2.3.3 Vibrate in a straight line along the direction of the human spine (see Figure 2Z).

2.3.4 Angular vibration around the X axis of the human body (see Figure 2)

2.3.5 Angular vibration around the Y axis of the human body (see Figure 2)

2.3.6 Angular vibration around the Z axis of the human body (see Figure 2)

2.3.7 Vibrations of individual parts of the human body are acted on by the handles, pedals, steering wheels, occupant armrests and headrests of the operating mechanism.

2.3.8 Vibration transmitted to the entire human body through the floor and seat

2.4 Types of vibration process

2.4.1 Uninterrupted vibration for a certain period of time

2.4.2 A series of vibration events, each vibration lasts a short time, and these vibrations are separated by other vibrations with small amplitude.

2.5.4

The contact surface of the human body and the vehicle body, the origin of the basic coordinate system of the human body and the test measurement point are all located on the supporting surface.

2.6 Test method

2.6.1 The ride comfort test of a car driving over bumps or pits.

2.6.2 Ride comfort test when a car is driving on random uneven roads.

2.7 Evaluation method

2.7.1 The evaluation depends on the subjective feeling of the evaluator.

2.7.2 Evaluate based on the measured vibration displacement, velocity, acceleration and other physical quantities.

2.7.3 A method of evaluating the root mean square value of the weighted acceleration.

2.7.4 A method of evaluation using acceleration peaks.

2.7.5 The method of evaluating the vibration dose value. This method is more sensitive to changes in vibration peaks than ordinary root-mean-square evaluation methods.

2.8 Other nouns

2.8.1

Pathological phenomena such as nausea and vomiting caused by vibration below 1 Hz.

2.8.2

The ratio of the peak value of the weighted acceleration time history to the root mean square value of the weighted acceleration.