32results about How to "Reduce acoustic noise" patented technology

An information handling system's thermal management is selectively altered by coupling a thermal barrier to the bottom surface of the information handling system chassis so that an air channel insulates against the passage of thermal energy from the bottom surface. A vent opening in a side of the thermal barrier allows airflow through the air channel to a vent opening of the information handling system. The airflow through the air channel cools the base of the thermal barrier so that an end user will experience reduced thermal energy if the information handling system rests on the end user, such as in the end user's lap.

A multilayer ceramic electronic part may include: a ceramic body; an active layer including a plurality of first and second internal electrodes disposed to be alternately exposed to both end surfaces of the ceramic body, having the dielectric layer therebetween; an upper cover layer formed on an upper portion of the active layer; a lower cover layer formed on a lower portion of the active layer and having a thickness thicker than that of the upper cover layer; and first and second external electrodes electrically connected to the first and second internal electrodes, wherein the first and second external electrodes include: first and second conductive layers extended from both end surfaces of the ceramic body onto upper and lower main surfaces thereof; and first and second insulation layers formed on the first and second conductive layers disposed on both end surfaces of the ceramic body.

A multilayer ceramic electronic component may include: a multilayer ceramic capacitor including a ceramic body in which a plurality of dielectric layers are stacked, a pair of first external electrodes and a pair of second external electrodes formed on both side surfaces of the ceramic body and extended to portions of a mounting surface of the ceramic body, and first and second internal electrodes alternately stacked, having the dielectric layer therebetween, exposed through at least one side surface of the ceramic body, and connected to the first and second external electrodes, respectively; and an interposer substrate including an insulation substrate bonded to the mounting surface of the multilayer ceramic capacitor, and first and second connection terminals formed on the insulation substrate and connected to the first and second external electrodes, respectively.

An integrated fiber interferometry interrogator for generating superimposed waves is disclosed. The system is optimized for efficiency and vibration attenuation. The system comprises an optical light source for generating a first signal, a first signal splitter which splits the first signal into a reference signal and an interrogation signal, optical modulators for modulating the signals, a fiber coupler connected to a fiber under test, an isolator, a circulator with a plurality of connections for directing the signals, a signal mixer for mixing the signals into superimposed waves, and photo diodes for receiving the superimposed waves.

A brushless motor has first and second power transistors which form current paths to three-phase windings so as to rotate a rotor. A position detecting part produces a position signal in response to a rotation of the rotor. An activation operation block controls active operation of the first and second power transistors in response to the position signal. The activation operation block includes a starting operation part which comprises an initial phase setting part, phase changing part and a phase correcting part. The initial phase setting part sets an initial phase of drive signals to the three-phase windings in response to the level of the position signal at the timing of a start signal. The phase changing part changes sequentially the phase of the drive signals to the three-phase windings in the positive direction in response to time. The phase correcting part corrects the phase of the drive signals to the three-phase windings in response to the occurrence of the rising and falling edges of the position signal. Therefore, the brushless motor with reduced position sensor can stably start the rotation of the rotor by using one position signal of one position sensor.

The invention relates to a capping device of a conduit mouth of a ship body, which comprises a cylinder body 1, cover plates 2 and a cover plate driving device 3, wherein the 2-6 cover plates 2 which can realize 90-degree rotation are symmetrically distributed on the vertical circular section close to a cylinder mouth of the cylinder body 1 as far as possible, in the cylinder body 1, along the central line of the circular section, the rotation axial lines of the cover plates 2 are parallel to the central line of the circular section, and all the cover plates can just seal the vertical circular section of the cylinder body when the cover plates are closed; a driving rotating shaft 4 and a driven rotating shaft 5 are connected at the two ends of each cover plate 2, the driving rotating shafts 4 and the driven rotating shafts 5 are respectively fixed on the cylinder body 1 through bearing seats 6, the axial lines are superimposed, and the driving rotating shafts and the driven rotating shafts can rotate along the axial lines respectively; and the cover plate driving device 3 is fixed on the cylinder body 1 and can drive the driving rotating shafts to drive the cover plates 2 to realize the 90-degree rotation. The capping device can reduce acoustic noise generated by the open conduit mouth and improve the working conditions of a ship-borne acoustic detection system; and the structure is simple and reliable, the conventional relay control can be adopted, the operation and the maintenance are convenient, and the cost is low.

The present invention relates to a multi-layer ceramic electronic assembly and a board provided thereon with the multi-layer ceramic electronic assembly. The multi-layer ceramic electronic assembly comprises a multi-layer ceramic capacitor composed of a first ceramic body, a plurality of first inner electrodes, a plurality of second inner electrodes, a plurality of first outer electrodes and a plurality of second outer electrodes; and a ceramic chip composed of a first ceramic body, a third inner electrode, a fourth inner electrode, a first connecting terminal, a second connecting terminal, a first outer terminal and a second outer terminal. The second ceramic body is formed through stacking up a plurality of ceramic layers on the mounting surface of a multi-layer ceramic capacitor. The first and second connecting terminals are respectively extending to some parts of the upper surface of the ceramic body from the lateral surface of the second ceramic body respectively, and are respectively connected to the first and second outer electrodes of the multi-layer ceramic capacitor. The first and second outer terminals are respectively arranged on the end of the ceramic body, and are respectively connected to the exposed portions of the third and fourth inner electrodes respectively.

The invention relates to a backlight driving circuit which comprises a switch assembly, a load comprising a filter capacitor and a light source connected in parallel, a controller, a direct-current boost module and a voltage signal processor. The controller generates and outputs a control signal, and the direct-current boost module receives the control signal and correspondingly outputs a voltage signal to drive the load through the switch assembly. The voltage signal processor detects the voltage signal outputted by the direct-current boost module, and when the ripple of the voltage signal is smaller than a certain default, the switch assembly is conducted; when the ripple of the voltage signal is greater than the certain default, the switch assembly is disconnected, and the voltage signal is converted into a voltage signal with smaller ripples to drive the load.

A composite electronic component includes a composite body including: a multilayer ceramic capacitor including a first ceramic body including a plurality of dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween and stacked to be perpendicular to a lower surface of the first ceramic body, and a ceramic chip being coupled to the multilayer ceramic capacitor and disposed on a lower portion of the multilayer ceramic capacitor, the ceramic chip including a second ceramic body, first and second terminal electrodes disposed on upper and lower portions of the second ceramic body and connected to the first and second external electrodes, respectively.

A damper assembly is disclosed and includes a main body defining a continuous fluid path extending between a first opening and a second opening, and a damper door rotatable within the main body to control the flow of fluid through the main body. The main body includes an engagement edge extending circumferentially on an inner surface of the main body. The damper door can be rotated relative to the main body to sealingly engage an outer edge of the damper door with the engagement edge. The engagement edge of the main body can be oriented on the inner surface such that the surface area of the outer edge such that engagement of the engagement edge gradually increases as the damper door is rotated to seal the damper door to the main body.

The invention relates to a method for controlling an electrical machine (13) of a hybrid powertrain (1) for recharging an electrical power battery (17) of an electric traction. The control method is configured such that the electrical machine (13) takes up a drawing torque from the heat engine (11), which torque has an upper limit, and from which the set value selected by the driver to respect anacoustic stress level is derived. According to the invention, when the set value selected by the driver is higher than a torque threshold, the method limits the drawing torque to a lower limit to ensure that the battery (17) of the electric traction is recharged.