Novel damper for passive security increasing

• Autorzy: Niculescu A. I. , Jankowski A.
• Języki publikacji: EN

Abstrakty

EN

Horizontal crash at road and rail vehicles generates human and material injuries, many of them with important negative effects. Damper in bumper a known solution for vehicles protection at crash is realized with different damping devices, from passive elements to actuators. Usually the devices are tunedfor 5 km/h crash speed. After collision the passive solutions destroy and must be removed with other new devices. The solutions using standard shock absorbers and actuators are improper the first dissipating insufficient energy and actuators being more expensive and having a long reaction time so the damping coefficient changing is realized in too low steps. VZN damper concept granted with European Patent EP l 190 184 and Romanian Patent RO l 18546, characterized by progressive damping coefficients with the stroke is a great opportunity to realize simple and cheap protection at crash, due to its capacity to realize constant damping force without mechanisms and electronics. li is necessary only to tune accordingly VZN damping characteristic to this desiderate. VZN concept consist of u piston rod attached to a piston without valves moving inside inner cylinder close at both ends and filled at rebound and compression by specific fllling valves placed in upper /bottom lids or on the ends of the inner cylinder. The damping effect is realized by valves or in cheap solution by metering orifices (holes/slots) placed sideways inner cylinder in convenient position. Due to this structure VZN tuning for constant damping force at different piston speed can be realize both with identical metering holes/slots placed at optimal distances, or placing metering holes/slots of different areas at eąual distances. The numbers of metering holes/slots are enough such the steps speed evolution be practical continuous and thus the damping force be practical constant. The VZN behaviour is increased by new components e.g. levelling pistons, double guiding elements and balancing solutions. Paper presents the theory used to dimension VZN damper placing metering orifices at eąual distances, a practical device with levelling piston and simulation comparative to standard one. The standard damper dissipates 30-40% lower energy comparative to VZN one. This means in the same situation in which VZN damper reduces constant speed from 30, respectively 20 [km/h] to zero, the standard dampers reduces speed up to 14, respectively 11 [km/h], then collapsing the vehicle.

Słowa kluczowe

EN

progressive damping; VZN; crash; passenger protection

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2010
• Tom: Vol. 17, No. 1
• Strony: 299--308
• Opis fizyczny: Bibliogr. 4 poz., rys.

Twórcy

autor

Niculescu A. I.

autor

Jankowski A.

• Romanian Academy, Institute of Solid Mechanics Constantin Mille Street 15, 0100141 Sector 7, Bucharest Romania tel: [phone], fax: [phone],

Bibliografia

• [1] Niculescu, A. I., Sireteanu, T., Stancioiu, D., Automotive selfadjustable shock absorber (VZN), FISITA 2004, World Automotive Congress, pp.19, Barcelona 2004.
• [2] Niculescu, A. I., Jankowski, A., Sireteanu, T., On „VZN“ damper behavior at crash, Journal of KONES Powertrain and Transport, Vol. 16, No. 2, pp. 369-374, 2009.
• [3] Niculescu, A. I., On vehicles axles suspension, collision and rebuff decreasing, Research in Mechanics, Romanian Academy Printing House, Cap. 7, pp. 173-204, 2007.
• [4] Niculescu, A. I., Automotive self adjustable damper with self correcting dissipation characteristic, European Patent EP 1 190, 184, 2005.