Seat Body Pressure Distribution Measurement System Beijing Crown Measuring Precision Electric Instrument
Seat body pressure distribution measuring system
Overview:
Seat comfort is an important evaluation index for car seats, including static comfort and dynamic comfort. The so-called comfort is the subjective feeling of the human body, which is caused by both physical and psychological factors.
Static comfort refers to the position, geometry and structural design of the seat, which should enable the human body to have a verified sitting posture and a good sense of touch in a certain working environment.
Dynamic comfort requires that the seat can still have a good feeling when it is static during the driver's completion of the driving task.
The best backrest angle for a car seat is 108 °
The best angle when reading is 101 ° --104 °
The basic requirements for seat comfort can be listed as follows:
1. Limit the fatigue of the driver and occupant to a minimum;
2. Can withstand greater pressure, safe and reliable;
3. Nice appearance, good thermal comfort, good moisture permeability, good breathability, and good sense of touch;
4. It has good anthropometric characteristics, that is, it is suitable for drivers and occupants of different sizes and shapes;
The pressure distribution between the human body and the seat is called the body pressure distribution in the sitting position. The distribution of body pressure in the sitting position is the main factor for evaluating comfort. From a physiological point of view, the muscles around the ischium of the human hip can withstand greater pressure, and the muscles under the thigh contain relatively larger nerves and blood vessels, and cannot withstand greater pressure for a long time, otherwise they are prone to paralysis and pain Discomfort and affect nerve conduction.
The result of general theoretical analysis is that the reasonable distribution of human sitting pressure is not uniform, but should gradually decrease smoothly from the periphery of the ischium to the edge.
When a person sits, the weight of the thighs and upper body must be supported by the seat surface. It can be seen from the anatomy of the human body that the human ischium is thick and can withstand greater pressure than the muscles around it. There are a large number of blood vessels and nervous system at the bottom of the thigh. Excessive pressure can affect blood circulation and nerve conduction, which makes me feel uncomfortable. Therefore, the pressure on the cushion should be designed according to the principle that different parts of the buttocks bear different pressures, that is, the pressure at the ischium is the largest, and gradually decreases to the surroundings, and the pressure drops to the lowest value when reaching the thigh. In order to reduce the pressure on the lower part of the buttocks, the seat surface should generally be designed with a cushion, and its softness is suitable for the ischial bone to support about 60% of the weight of the human body. Backrest body pressure is mainly distributed in the shoulder blade and lumbar vertebrae. The two supporting positions are usually referred to as "waist leaning" and "shoulder leaning." Among them, the position of “lumbar leaning†is about between 3-4 sections of lumbar vertebrae, and the position of shoulder leaning is about 5-6 sections of thoracic vertebrae. When designing the seat back, the "two-point support" effect of these two places must be fully considered. Among them, "waist leaning" is more important than shoulder leaning
5. Software analysis system for body pressure distribution:
1. It has a real-time running record function of the main parameters (pressure, area, time) of the test system.
2. It can realize the graph or curve relationship display of pressure and area, pressure and time.
3. With the recording function of dynamic pressure change, the maximum recording time is about 10 hours
4. It has the functions of recording and rewinding observation and measurement image display, and supports single-frame or frame-by-frame animation playback analysis.
5. Stress test results can be exported in pictures and Excel format.
6. Simultaneous measurement, observation and comparison of two or more measurement results, showing the center of force and its moving trajectory.
7. It can reflect the pressure value and contact area of ​​a specific area separately
8. ASCLL file output
9. The user can set the value unit by himself
10. At the same time, 13 sets of data can be analyzed and more comprehensive analysis of the seat body pressure distribution data
11. Index of body pressure distribution and its characterization
Index of body pressure distribution and its characterization
Serial number
Body Pressure Index
Characterization
1
Maximum pressure Pm
The softness of the cushion, the harder the cushion Pm is, the larger
2
Maximum pressure Pv
Characterize cushion stiffness and surface shape
3
Maximum pressure gradient Gm
Reflect the rigidity and material distribution of the cushion
4
Average pressure gradient Gv
Reflect the reasonable distribution of the cushion material and the size of the stiffness
5
Asymmetry coefficient Cu
Represents whether the sitting position is reasonable, the symmetry of the seat
6
Longitudinal pressure distribution curve PL
The trend of hip and leg compression and pressure changes, which comprehensively reflect the geometric and physical characteristics of the cushion stiffness, shape, height of the cushion from the ground
7
Longitudinal torque distribution curve
Reflect the ability of the seat to maintain the balance of the human body
8
Roll Stability Coefficient S
The ability of the seat cushion to restore its equilibrium position when roll occurs
9
Static SPD%
Characterize the cushion's ability to generate body pressure distribution
10
GC, GT
Characterize the rate of pressure change in the area of ​​the ischial tuberosity
11
Dynamic DSPD%
Characterize the cushion's ability to maintain a uniform body pressure distribution over a period of time
12
Pcrms
The ability of cushion to relieve vibration frequency under obvious vibration in an instant
13
aPcrm
The ability of cushion to relieve vibration under long-term vibration
Seat body pressure distribution measuring system
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