A vibration reduction device for a sensor according to the present invention includes: a sensor coupling unit coupled to the upper part of the sensor; a vertical spring fixed to the sensor coupling unit in a direction perpendicular to the sensor to support the load of the sensor; and a horizontal spring fixed to the sensor coupling unit in a direction parallel to the sensor to offset the positive rigidity of the vertical spring. According to the present invention, since the natural frequency of the vibration reduction device can be set in an ultra-low frequency band by the vertical spring and the horizontal spring, the vibration above the ultra-low frequency band can be reduced.

Vibration reduction device for sensor

The invention discloses a quasi-zero stiffness vibration isolator. The quasi-zero stiffness vibration isolator comprises a central shaft, a fine adjustment nut, a first spring, an electromagnetic spring, a second spring and a spring fixing ring. One end of the central shaft is a load end, and the other end of the central shaft is a free end. The fine adjustment nut, the first spring, the electromagnetic spring, the second spring and the spring fixing ring sequentially sleeve the center shaft from the load end to the free end. The electromagnetic spring comprises a first end portion magnet ring, a middle electromagnetic ring and a second end portion magnet ring, wherein the first end portion magnet ring, the middle electromagnetic ring and the second end portion magnet ring sleeve the central shaft sequentially in the axial direction of the central shaft. The middle electromagnetic ring comprises an annular electric coil and a middle magnet ring, wherein the annular electric coil sleeves the center shaft, and the middle magnet ring sleeves the annular electric coil. The quasi-zero stiffness vibration isolator can realize quasi-zero stiffness in a long stroke and ensure the expansionof the effective vibration isolation frequency band under the condition that the bearing capacity is ensured. The quasi-zero stiffness vibration isolator can be applied to large amplitude conditions.The rigidity of the quasi-zero stiffness vibration isolator can be adjusted online by controlling current, so that the vibration isolation performance of the quasi-zero stiffness vibration isolator is further improved.

Quasi-zero stiffness vibration isolator

PURPOSE:To shorten a span of impact detection time by attaching a sensor case to a car body via an impact absorbing means which absorbs an impact in a sense along the traveling direction of sensing mass being produced in the sensor case in time of a car crash CONSTITUTION:Even if an impact sensor 14 is installed in the vicinity of a collisional part in a vehicle and sudden deceleration (acceleration) is produced in this part in time of a car crash, any impact in a sense along the traveling direction of sensing mass 20 being added to a sensor case 16 from a car body is absorbed by an impact absorbing means 36 Therefore such a fear that suddenly variable deceleration (acceleration) is produced in the sensor case 16 in a short time is preventable from occurring, thus a contact part 22 is prevented from being vibrated piecemeal as well as this contact part 22 can be prevented from being turned on or off bit by bit

Impact sensor mounting structure in vehicle

PURPOSE: A vertical semi-active vibration damper is provided to obtain vertical vibration damping efficiency by using a low performance driving unit. CONSTITUTION: A vertical semi-active vibration damper(100) comprises a frame(10), a first flexible beam(20), a second flexible beam(30), a connecting member(40), and a driving unit. One end of the first flexible beam is fixed in the frame. The connecting member connects the first flexible beam and the second flexible beam. A supporting part is connected to the connecting member for transferring the vibration of object to the connecting member. The driving unit is coupled with the frame and applies force to the second flexible beam horizontally.

Semiactive vertical isolator using horizontal actuator

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Vibration reduction device for sensor

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Quasi-zero stiffness vibration isolator

Impact sensor mounting structure in vehicle

Semiactive vertical isolator using horizontal actuator