Vehicle crash test

If the car is perceptive, what is the experience of being hit?

Maybe now, somewhere in the world, a car with "perception" is speeding towards the barrier. After a few seconds, it will "feel" the extreme impact. If I say that this is not an accident of "stepping on the accelerator by mistake", but an intentional one, would you think it incredible? In fact, this is the most common scene in various automobile safety laboratories all over the world.

For most people, they have just heard of the term car crash test, but they don't know how this seemingly barbaric test can ensure the safety of the driver and passengers in the car. After the collision, there are powerful and accurate acceleration sensors in the distorted car and the scarred dummy inside. They can not only bear the huge impact of the impact, but also shoulder the responsibility of collecting and recording valuable security data. These safety data will be collected and analyzed, and finally become the necessary crash safety index for each vehicle.

What did the car experience in the crash test?

Collision test data is one of the most important basis for evaluating vehicle passive safety performance. In a collision accident, the overload of the vehicle may be much more than 1000g (the scientific standard of 1G in metric unit is 9.8057m/s2). If you don't have any idea of such a number, you can use it as a reference: if the gravitational acceleration that makes us stay on the earth is 1g. In contrast, the acceleration of gravity experienced by passengers on a large angle climbing plane is about 1.8g, while the acceleration of gravity on a roller coaster is 3-5g. People begin to lose consciousness when they are exposed to 6G of gravitational acceleration, while people begin to face the risk of fracture when they are exposed to 10g of gravitational acceleration.

From these data, it can be seen that the acceleration of gravity between vehicles and people is very large. The acceleration sensor needs to test the huge gravitational acceleration of the structure it is connected to. Such a collision risks damaging the cables and connectors, resulting in signal degradation or distortion. Because collision test experiments often cost hundreds of thousands of dollars, each connection is crucial, and the importance of high quality sensor and other components is fully reflected here. In consideration of the reliability of the sensor, our 400 series acceleration sensor is suitable for automobile collision test.

How to accurately perceive collision data?

In the vehicle safety laboratory where crash tests are conducted, the most common picture is a dummy sitting in the car and then intentionally colliding according to the plan. After the collision, the acceleration, load and deformation of each part of the dummy are detected by the automobile manufacturer / testing organization, so as to evaluate the safety level of the vehicle. In order to sense the collision data, sensors are essential applications. On the car and dummy, these sensors are used to analyze the technical data of the car at the moment of collision.

The sensitivity of sensor is one of the most basic indexes of sensor. The sensitivity of the sensor directly affects the measurement of vibration model. In the crash test, the acceleration sensor is most used in the car body.

For example, in the crash test, our 400 series acceleration sensors for crash test are placed on the vehicle to study the impact of front, rear, side and rollover. They are usually pasted. These sensors are used to measure the impact of obstacles, pillars, other vehicles or the road itself on the structure of the test vehicle. 432 / 430 / 890 series of sensors are common sensors placed on or in the vehicle in the vehicle crash test. The accelerometer is a plug and play accelerometer, which provides excellent dynamic range and stability with advanced piezoresistive MEMS technology. This series of products have unique full bridge output structure. The operating temperature range is as low as - 40 ℃ and as high as 90 ℃, and a small amount of gas damping brings ultra-high impact resistance.

V432 3-Axis ATD piezo-resistive accelerometer

V432 3-Axis ATD piezo-resistive accelerometer

Model V432 is a miniature triaxial accelerometer designed for crash testing and ATD applications that require minimal mass weight and a wide frequency response. The accelerometer meets SAE J211 specifications for instrumentation for impact testing and SAE-J2570 specification for Anthromorphic Test Device(ATD) transducers. It is available in different acceleration ranges, 500 g and 2000 g full scale. The tri-axial accelerometer is based on a latest piezo-resistive MEMS sensing element, which offers exceptional dynamic range and stability. This unit features the full bridge output configuration with a compensated temperature range from 0 to +50º C. Model V432 accelerometer has a standard transverse sensitivity accuracy of <3%. Advance MEMS structure provides outstanding shock survivability, a flat amplitude and phase response up to 7kHz.

Feature / Application

• SAE J211 comply

• DC response

• Miniature tri-axial

• Shock, low & high frequency

• 10K g shock survivability

• 2-10Vdc Excitation

• Integrated 1 to 3 cable

V430 3-axis MEMS accelerometer for vehicle crash test application, vibration sensor

V430 3-axis MEMS accelerometer for vehicle crash test application, vibration sensor:

Model V430 is a miniature triaxial accelerometer designed for crash testing that require minimal mass weight and a wide frequency response. The accelerometer meets SAE J211 specifications for instrumentation for impact testing. It is available in two different acceleration ranges, 500 g and 2000 g full scale. The tri-axial accelerometer is based on a latest piezo-resistive MEMS sensing element, which offers exceptional dynamic range and stability. This unit features the full bridge output configuration with a compensated temperature range from 0 to +50º C. Model V430 accelerometer has a standard transverse sensitivity accuracy of <3%. Advance MEMS structure provides outstanding shock survivability, a flat amplitude and phase response up to 7kHz.

Feature / Application

• Water proof • Auto crash test

• DC response • Shock test

• Miniature tri-axial • Drop test

• Shock, low & high frequency

• 10K g shock survivability

• 2-10Vdc Excitation

• Integrated 1 to 3 cable

V890 NVH DC response seat pad accelerometer,vibration sensor

V890 NVH DC response seat pad accelerometer,vibration sensor:

Model V890 is a static response triaxial seat pad accelerometer designed especially for characterizing whole body vibration in accordance with ISO 2631-1 and ISO 8041. The seat pad incorporates a removable triaxial accelerometer with ±2000mV full scale output. The model 890 is designed for static or low frequency measurements with a measurement resolution of <1.5mg. A flexible cable is included for simple interface. The accelerometer uses silicon Micro-Electro-Mechanical System (MEMS) sensing element which provides a better operating in low frequency range. The MEMS sensor combines outstanding variable capacitance technology achieve very low sensitivity variation over the operating temperature range, compared to other sensing element designs. The accelerometer enables the test engineer or technician to measure the accelerations of three orthogonal axes of vibration simultaneously on vehicle or platform. All variations provide reliable measurements and long-term stability.

Feature / Application

• Static response • Vehicle drive testing

• 2 to 200g full scale • Aerospace grounding

• Motion, low frequency • Human motion

• Vehicle drive testing • Automotive platform motion test

• 5K g shock survivability

• Temperature compensation