A bearing bushing, for example, for a motor vehicle. The bearing bushing is switchable between a first and a second stiffness stage. The bearing bushing has a first elastomer ring, which is arranged rotationally fixedly on an outer circumferential surface of an inner ring, and a second elastomer ring, which is arranged rotationally fixedly on an inner circumferential surface of an outer ring. Radially between the two elastomer rings, an intermediate ring makes contact in a rotationally fixed manner with the two elastomer rings. To change in stiffness of the bearing bushing, the first elastomer ring can be bridged by the intermediate ring and at least one blocking ring which is arranged on the bearing bushing at an end side.

A vibration control element includes a nanovoided polymer layer having a first damping coefficient and a first resonance frequency in a first state and a second damping coefficient and a second resonance frequency in a second state, where the first damping coefficient is different from the second damping coefficient and the first resonance frequency is different from the second resonance frequency.

An active vibration controller includes: a housing; a first magnetic member on the housing, the first magnetic member including a first tip portion extending from a first base end of the first magnetic member and including a first connecting surface extending from the base end on the first tip portion; a movable member including a second magnetic member including a second tip portion extending from a second base end of the second magnetic member and a second connecting surface extending from the second base end on the second tip portion; an exciting coil; a magnetic viscoelastic elastomer having a magnetic viscoelastic property varying according to a magnetic field magnitude between the first and second tip portions, and connects the first connecting surface to the second connecting surface. The first and second tip portions are thinner than the first and second base ends, respectively.

Improved equipment bases and methods for making and using same are disclosed herein. The equipment base can include a first coated substrate including a first part having a first thickness sized to provide the load-bearing support for the equipment, a first elastomer coating the first part, a second coated substrate positioned adjacent to the first coated substrate, the second coated substrate including a second part having a second thickness sized to provide the load-bearing support for the equipment, and a second elastomer coating the second part. A first seam can be formed between the first and second coated substrates to allow for moisture to pass between the first and second coated substrates so that moisture is allowed to seep away from the bottom of the equipment.

The present invention relates to a dynamic damper control device. A control unit includes a first acceleration sensor configured to obtain a first acceleration of a mass member, a second acceleration sensor configured to obtain a second acceleration of a vibration control target member, and a target amplitude amplification ratio calculating unit configured to calculate a target amplitude amplification ratio of the mass member and the vibration control target member based on the first acceleration and the second acceleration, and is configured to change a magnetic force produced from an electromagnet based on the target amplitude amplification ratio.

Improved equipment bases and methods for making and using same are disclosed herein. The equipment base can include a first coated substrate including a first part having a first thickness sized to provide the load-bearing support for the equipment, a first elastomer coating the first part, a second coated substrate positioned adjacent to the first coated substrate, the second coated substrate including a second part having a second thickness sized to provide the load-bearing support for the equipment, and a second elastomer coating the second part. A first seam can be formed between the first and second coated substrates to allow for moisture to pass between the first and second coated substrates so that moisture is allowed to seep away from the bottom of the equipment.

The disclosure relates to bearing bushes for a motor vehicle, in which the bearing bushing may be switchable between a first and a second stiffness stage. The bearing bushing may include a first elastomer ring, which is arranged at least indirectly on an outer circumferential surface of a bolt, and a second elastomer ring, which is arranged radially between a first and second sleeve. The second sleeve may be arranged radially between the first and the second elastomer rings. In order to change the stiffness stage of the bearing bushing, the two sleeves may be connectable to one another by at least one ring which comes into contact with said sleeves at an end side.

An engine mount control apparatus that is an active noise vibration control apparatus according to the present disclosure is characterized by being provided with a housing that has an outer core, an inner core that is disposed inside the outer core, and an electromagnetic coil that is positioned between the outer core and the inner core and by a portion between the outer core and the inner core being filled with a magneto-rheological elastomer containing magnetic particles. The present disclosure enables the maintenance of good static load support performance.

Bearing bushes, for example, for a chassis of a motor vehicle are disclosed. A bearing bush may include a shaft, a hub, and an elastomer element which is arranged radially therebetween. The bearing bush may be configured to be switched between a first and second stiffness levels. The hub may have a main body and a plurality of radially adjustable plungers which are arranged in the main body. The plungers may be configured to engage the elastomer element and change the stiffness of the bearing bush from the first stiffness level to the second stiffness level. The elastomer element may have a plurality of radial elements arranged on the main body and configured to be compressed via a respective plunger in order to increase the stiffness of the bearing bush. An actuator including an electric motor may be configured to radially adjust the plungers in the main body.

Provided is a power converter for converting a DC input voltage to a DC output voltage and outputting the DC output voltage to a load, including: a discharge resistor which discharges electric charges accumulated in the load, a discharge switch which switches an electric conduction state of the discharge resistor; and a discharge controller which controls the discharge switch so that the output voltage becomes a predetermined target voltage, wherein the discharge controller controls the discharge switch to cut off electric conduction of the discharge resistor when the output voltage is lower than a predetermined threshold voltage that is higher than the target voltage, and wherein the discharge controller corrects the threshold voltage in response to a temperature change of the load.