44results about How to "Increase the exciting force" patented technology

A semi-submersible offshore vessel including a rectangular ring-pontoon having a first transverse pontoon section at a first end of the vessel and a parallel second transverse pontoon section at a second end of the vessel, and two parallel pontoon sections extending between the first and the second end of the vessel. Four support columns extend upwardly from respective edge-portions of the ring-pontoon to support an upper deck structure. The first pontoon section has a vertical mean cross-section area (A) which exceeds the corresponding vertical mean cross-section area (B) of the second pontoon section, and the support columns in the second column pair each has a water-plane area (F) which exceeds the water-plane area (D) of each of the support columns in the first column pair.

An active dynamic vibration absorber apparatus for a vehicle that may be mounted to a frame of the vehicle and vibrates when power may be supplied to attenuate vibration of the vehicle, may include a housing, an upper spring and a lower spring, and a yoke assembly disposed between the upper spring and the lower spring which may be plates arranged in parallel, and selectively vibrates up / down in the housing, wherein the yoke assembly has an upper protrusion and a lower protrusion that protrude from the top and the bottom thereof, respectively, the upper protrusion being fastened to the center of the upper spring through the housing, and the lower protrusion being fastened to the center of the lower spring in the housing.

A bobbin comprises three hollow-cylindrical sections, specifically a middle body section, and two lateral body sections. The middle body section has its diameter diminished compared to the two lateral body sections thus forming an annular recess which allows a magnet wire to be wound with an additional number of turns around the bobbin without increasing a motor size. With this bobbin structure, when the number of turns of a magnet wire is set to remain unchanged, the diameter of flanges of the bobbin can be reduced resulting in a downsized motor.

Disclosed is an ultrasonic motor whose output is improved by enhancing the exciting force of a vibration caused on a vibrating body having a rectangular portion. The ultrasonic motor includes the vibrating body having a piezoelectric element, and a moving body which contacts the vibrating body. The phases of two difference vibrations caused on the vibrating body are changed to make the moving direction of the moving body or the vibrating body itself variable by selecting whether to apply a drive signal to first electrodes provided at one side of the piezoelectric element or to apply a drive signal to second electrodes provided at a portion whose polarization direction differs from that of the first electrodes.

[Problem] To provide a vibration generator that reduces power consumption for an entire vibration testing device and is not damaged even when intensifying the vibrating force or increasing the size of the vibration generator. [Solution] A vibration generator comprises a moving portion on which a test body is placed and a stationary portion having a magnetic circuit member, said magnetic circuit member having a magnet and a magnetic permeable yoke and being disposed so that a static magnetic field is formed in a cavity of the magnetic circuit member, and said moving portion having a driving coil and being disposed in a state where the driving coil is inserted in the cavity, and is configured so that a desired vibration is applied to the moving portion by applying a driving current to the driving coil. The vibration generator further comprises a cooling blower for cooling at least either of the magnet and the driving coil, a control device for controlling the rotational speed of the cooling blower, and a temperature measuring means for measuring the temperature of at least either of the magnet and the driving coil, and is configured so that the control device controls the rotational speed of the cooling blower on the basis of the temperature of at least either the magnet or the driving coil that was measured by the temperature measuring means.

The invention provides a vibration exciter assembly structure and a vibration screen. The vibration exciter assembly structure comprises a power device and further comprises an external coupler, a spindle unit and a bearing structure. The external coupler is connected with the power device and the spindle unit. The bearing structure comprises two bearing sets which are symmetrically fixed to the two ends of the spindle unit respectively. Each bearing set comprises a bearing pedestal and two bearing pieces, wherein the two bearing pieces are installed in the bearing pedestal and connected to the spindle unit in a sleeving mode, and a balance weight is arranged on one side of each bearing piece and fixedly arranged on the spindle unit. The vibration screen comprises at least one vibration exciter assembly structure. The spindle unit can be provided with the two bearing sets. In each bearing set, the balance weights can be installed on one sides of the two bearing pieces, and the exciting force of the vibration exciter can be effectively improved. By means of the synchronizing wheel structure, the vibration screen can be provided with two or more vibration exciter assembly structures to further improve the exciting force, and the actual production requirement is met.

The invention provides an accurate controllable non-contact test piece rotary magnetic field fatigue excitation and vibration test device. The device comprises a vibration damping insulation clamp, a vibration damper, a dynamic balance device, a vibration exciter, an electromagnetic piezoelectric coupling vibration sensor, a test station, a transmission device and an accurate control device. The excitation and vibration test device is suitable for rotary test pieces and especially suitable for vibration characteristic researches on a wind power blade, an engine, a turbine blade, a helicopter rotor and a tail rotor blade, the excitation and vibration test device can vividly simulate vibration fatigue states of rotary test pieces respectively under conditions of 360-DEG all directions, same rotating speed and different excitation forces, same excitation force and different rotating speeds, and different rotating speeds and different excitation forces, the excitation and vibration test device can monitor related vibration characteristic parameters such as the excitation force, the vibration displacement, the vibration speed and the vibration acceleration continuously, and the excitation and vibration test device is suitable for vibration fatigue characteristic analysis on stationary test pieces.

The invention discloses a bridge pier VSR (vibration stress relief) method for a steel structural bridge and relates to the technical field of stress relief treatment of steel structure parts. A bridge pier of the steel structural bridge is a high-rigidity and heavy large structural part, and stress relief treatment is difficult to perform with existing thermal stress relief, natural stress relief, ultrasonic impact stress relief and VSR methods. According to the method, the bridge pier is supported by a support pad, multiple sets of VSR equipment are used, multiple vibration exciters are adjacently fixed on a lower frame beam of the bridge pier, multiple vibration testers are adjacently fixed on an upper frame beam of the bridge pier, then, multiple vibration exciters are controlled by use of multiple controllers, co-frequency sub-resonance vibration is performed on multiple resonance peaks of the bridge pier for several hours, the purpose of effectively relieving the residual stressis achieved, the average relief rate of the residual stress reaches 43%, the problem of difficulty in relieving the residual stress of the bridge pier is solved, and the method can be applied to steelstructural bridges.

The invention provides an adjustable multifunctional excitation device of a vibratory roller, which comprises a controller used for controlling the entire vibratory roller, wherein the controller is connected with a valve via conductors; the valve is communicated with a vibration exciter via a rotary connector and a hydraulic lock; the vibration exciter is characterized in that a main driving gear engaged with a primary forward gear and a secondary forward gear is arranged on the output shaft of a hydraulic motor; a primary driving shaft is arranged on the primary forward gear; a primary clutch and at least one primary eccentric block are arranged on the primary driving shaft; a gear shaft of a primary reverse gear is connected with a rotary oil cylinder; the oil port ends A and B of the rotary oil cylinder are communicated with the two corresponding oil port ends F and G of the valve via the rotary connector; the output shaft of the rotary oil cylinder is connected with the primary driving shaft; a secondary driving shaft is arranged on the secondary forward gear; a secondary clutch and at least one secondary eccentric block identical with the primary eccentric block are arrangedon the secondary driving shaft; and a secondary reverse gear engaged with the primary reverse gear is arranged at the other end of the secondary driving shaft.

The invention discloses a vibration ageing method for a ship body, and relates to the technical field of stress-removal treatment of steel structural parts. The ship body is a large welding structuralpart, and an existing thermal-ageing and vibration-ageing method is difficult to perform ageing treatment on the ship body. The vibration ageing method is characterized in that a plurality of vibration exciters are fixedly arranged on the ship body in an adjacent mode, and then are started and controlled; and same-frequency sub-resonance vibration is performed while the ship body has same sub-resonance frequency, so that the purpose of effectively eliminating residual stress is achieved with an average residual stress eliminating rate of 47.5%, and therefore, the technical problem that residual stress of the ship body is difficult to eliminate is solved, and the vibration ageing method can be applied in the ship-making industry.