Why are dummies in car crash tests fatter than previously designed?Release time: 2015-03-11 09:50
Car safety testing has come a long way, and it's not the age of the 1930s to imitate the impact of dropping corpses under an abandoned elevator shaft. (The earliest experiments were performed with human corpses. The corpses were used to measure the human body in a car accident The resistance strength of the crushing and cutting force that is often encountered when measuring. For example, the weight is dropped on the body part, bone or whole body in the elevator passage. The acceleration of the weight can be calculated easily. Next step It is to install the accelerometer on the corpse, tie the corpse to the car, and then perform a head-on collision or roll test on the experimental site).
The number of road fatalities in the United States has reached an all-time low, largely due to crash test dummy being more advanced than before. Before car manufacturers enter the European and American markets for legal sale, car manufacturers must use test dummy to prove the safety performance of the vehicle. The dummy has become an ultra-complex humanoid tool for collecting data and assessing risks. They are a group of truly unknown heroes.
"The latest dummy can collect information from more than 130 channels," said Chris O 'Connor, CEO of Humanetics, the world's leading dummy manufacturer. "The amount of data is 4-5 times that of a few years ago."
Humanetics works with insurance companies and academic research institutions to analyze this growing data. By analyzing the data, they were able to rank the most common types of injuries and the most vulnerable.
Three human models for car collisions:
1.50% mannequin: representing a medium body with a height of 177 cm and a weight of 86 kg;
2.95% mannequin: a large figure representing a height of 188 cm and a weight of 108 kg;
3.5% mannequin: a short figure representing a height of 148 cm and a weight of 56 kg.
At the NACP European Safety Impact Testing Center, Hy-drid3 is used to collect frontal crash information for child mannequins:
1.6-month human model: 67 cm tall and 10 kg in weight;
2.December human model: height 76 cm, weight 13 kg;
3.18 months human model: 83 cm tall and 16 kg in weight;
4.3-year-old model: 97 cm tall and 20 kg weight;
5.6-year-old model: 130 cm tall and 30 kg in weight;
6.10-year-old model: 138 cm tall and 36 kg in weight.
Most of the mannequins are made of metal and plastic. The chest cavity is made of steel, the scapula is made of aluminum, and the pelvis is plastic. A mannequin is worth 150,000 to 300,000 marks. The mannequin has about 60 sensors. .
A small history of dummy models used in crash tests:
In 1948, the U.S. Air Force first used human models for aircraft seat ejection tests;
In 1973, General Motors developed a better humanoid model, Hydroid2;
Hydros3 and US SID in the 1980s;
In 1991, Europe launched its own side impact model EURO SID.
In order to adapt to the situation of more and more overweight drivers, Humanetics began to develop obese dummy. One dummy weighed 273 pounds (123.8 kg) and had a BMI of 35!
Analysts also said that 50-year-old drivers will increase their risk of serious injury by 20%, and 80-year-old drivers will increase their risk by 40%.
In 2012, about 35% of the US population was obese, and nearly 70% were overweight. Whether from a health perspective or an economic perspective, the price behind the growing obesity has overwhelmed the United States. And the heavier weight makes car test dummy data less and less representative.
"The fatality rate of obese people in car accidents is 78% higher than that of ordinary people. The reason is that in the obese part, the fat of ordinary people is accumulated in the middle of the body, which will affect our sitting posture."
In 2010, researchers at the University of Buffalo and Erie County Medical Center analyzed 150,000 car accidents in the United States from 2000 to 2005, and found that the mortality rate of moderately obese drivers increased by 21%, while that of morbidly obese drivers increased. Mortality has increased by 56%.
"The crash test dummy provided us with valuable physical response data from the car accident and saved many lives, but these dummy can only be used to respond to standard weight human individuals," said Dr. Dietrich Jehle, lead author of the study.
More about car test dummy: http://airulm17.com/productlist/list-5-1.html
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