37results about How to "Improve vibration performance" patented technology

There is provided a bumper absorber attachment structure including (1) bumper reinforcement, (2) a first engaged portion that is formed at a vehicle upper side of a side face at a vehicle front side of the bumper reinforcement, (3) a second engaged portion that is formed at a vehicle lower side of the side face at the vehicle front side of the bumper reinforcement, (4) a bumper absorber that includes a thinned portion, an upper leg, and a lower leg, (5) a first engagement portion that is formed at a vehicle rear side of the upper leg, and that engages with the first engaged portion, and (6) a second engagement portion that is formed at a vehicle rear side of the lower leg, and that engages with the second engaged portion in a case in which the bumper absorber is displaced toward the vehicle lower side in a collision.

The invention discloses a focused shock excitation device capable of exciting an MEMS microstructure in water. The focused shock excitation device comprises a support and an ellipsoidal cavity which are arranged on a substrate, wherein the ellipsoidal cavity is formed by connecting an upper cavity and a lower cavity and an inner cavity of the ellipsoidal cavity forms more than half ellipsoid; a mounting seat is arranged in the lower cavity; two pin electrodes are arranged on the upper end of the mounting seat; the two pin electrodes are arranged on a cross section at a first focal point of the ellipsoid; a microstructure unit is arranged on the support through a manual tri-axial displacement table; the microstructure unit is arranged at a second focal point; the pin electrodes are respectively electrically connected to two electrodes of a high-voltage capacitor; a distance between pinpoints of the pin electrodes is smaller than a maximum air breakdown gap in water after the high-voltage capacitor is fully charged; and two electrodes of the high-voltage capacitor are respectively electrically connected to an anode and a cathode of a high-voltage power supply. The device not only excites the MEMS microstructure in water but also avoids the interference of vibration response of a base structure on a test result, the non-contact excitation of the microstructure is realized and the excitation effect is good.

The invention provides a precise direct-driving air-floating platform with adjustable damping. The precise direct-driving air-floating platform is characterized in that an air-floating left support mechanism and an air-floating right support mechanism of the platform are fixedly connected with a marble base; a worktable is connected with the air-floating left support mechanism and the air-floating right support mechanism; a grating reading head is fixedly arranged on a side surface of the worktable; a grating ruler is fixedly connected with the air-floating right support mechanism; a linear motor assembly transition plate is connected to the bottom of the worktable; a driving linear motor rotor and a damping linear motor rotor are fixedly connected with the linear motor assembly transition plate; and a driving linear motor stator and a damping linear motor stator are fixedly connected with the marble base. The precise direct-driving air-floating platform is a damping-adjustable high-precision positioning device, and is simple in structure and convenient to operate.

The invention discloses a uniaxial elliptic motion trail vibration exciter, comprising a vibration box body, a base, a vibration exciting spring and an eccentric shaft, wherein the eccentric shaft is arranged on the vibration box body; the vibration exciting spring is arranged between the vibration box body and the base; the vibration box body is provided with more than two pairs of orbit determination pairs, each pair of orbit determination pair comprises two orbit determination assemblies which are symmetrically arranged at the two sides of the vibration box body; each orbit determination assembly comprises an orbit determination rod and a sliding sleeve; the upper end of the orbit determination rod is sheathed into the sliding sleeve, the sliding sleeve is hinged on the vibration box body, the lower end of each orbit determination rod is hinged on the base, and the orbit determination rods are uniformly obliquely arranged in an array. The uniaxial elliptic motion trail vibration exciter disclosed by the invention has the obvious effects that circular motion trail of a uniaxial vibration exciter is converted into an elliptic motion trail by applying design of the orbit determination rods and the sliding sleeves, and vibration exciting effect and efficiency are enhanced.

The invention discloses a rotary ultrasonic vibration excitation device and a time-space phase tuning method. The device comprises a disc stator, piezoelectric vibrators and an adjustment mechanism. The piezoelectric vibrators are installed along the axial direction of the disc stator. The disc stator and the piezoelectric vibrators are distributed along the circumference in group symmetry or uniformly. Under the action of external voltage, the piezoelectric vibrators produce axial vibration and excite periodic vibration of the disc stator. Under excitation of the multiple piezoelectric vibrators, the disc stator can produce traveling wave or standing wave. The time-space phase tuning method comprises analyzing the vibration excitation rules of the two basic configurations of the piezoelectric vibrators, namely grouped distribution and uniform distribution, and giving specific vibration excitation performance optimization technologies. The vibration excitation device has the significant advantages of high mechanical and electrical conversion efficiency, multi-time-space phase vibration excitation, dynamically adjustable amplitude, and the like. The technical problem that the existing vibration excitation device of the kind is low in efficiency and the time-space phase selection range is limited is solved.