402 results about "Mechanical noise" patented technology

A system and method in accordance with the present invention provides for a low cost, bulk micromachined accelerometer integrated with electronics. The accelerometer can also be integrated with rate sensors that operate in a vacuum environment. The quality factor of the resonances is suppressed by adding dampers. Acceleration sensing in each axis is achieved by separate structures where the motion of the proof mass affects the value of sense capacitors differentially. Two structures are used per axis to enable full bridge measurements to further reduce the mechanical noise, immunity to power supply changes and cross axis coupling. To reduce the sensitivity to packaging and temperature changes, each mechanical structure is anchored to a single anchor pillar bonded to the top cover.

The objective of the present invention is providing a method for fabricating high quality diffractive waveplates and their arrays that exhibit high diffraction efficiency over large area, the method being capable of inexpensive large volume production. The method uses a polarization converter for converting the polarization of generally non-monochromatic and partially coherent input light beam into a pattern of periodic spatial modulation at the output of said polarization converter. A substrate carrying a photoalignment layer is exposed to said polarization modulation pattern and is coated subsequently with a liquid crystalline material. The high quality diffractive waveplates of the present invention are obtained when the exposure time of said photoalignment layer exceeds by generally an order of magnitude the time period that would be sufficient for producing homogeneous orientation of liquid crystalline materials brought in contact with said photoalignment layer. Compared to holographic techniques, the method is robust with respect to mechanical noises, ambient conditions, and allows inexpensive production via printing while also allowing to double the spatial frequency of optical axis modulation of diffractive waveplates.

An engine start system which may be employed in automotive idle stop systems. The engine start system includes a pinion gear to be pushed to a ring gear coupled to an engine for achieving meshing engagement with the ring gear. After the pinion gear engages the ring gear, the engine start system starts to rotate the pinion gear using a starter motor to crank the engine. Specifically, when an engine restart request is made following an engine stop request, the engine start system waits until after the speed of the engine drops below a preselected gear engageble speed and then moves the pinion gear toward the ring gear without rotating the pinion gear. This minimizes the consumption of fuel in the vehicle in supplying electric power to the starter motor and a maximum level of mechanical noise arising from the engagement of the pinion gear with the ring gear.

The embodiment of the invention provides a de-noising method, which comprises the following steps of: acquiring a sound signal in air, wherein the sound signal comprises a mechanical noise signal and a voice signal; acquiring the mechanical vibration data of a microphone by using a sensor which is arranged in the microphone; performing operation according to the mechanical vibration data of the microphone, and thus obtaining a vibration characteristic signal, wherein the vibration characteristic signal comprises a vibration characteristic waveform; and eliminating the mechanical noise signal which is acquired by the microphone according to the obtained vibration characteristic signal. Correspondingly, the embodiment of the invention also provides the microphone. By adoption of the invention, the mechanical vibration of the microphone can be sensed by using the sensor which is arranged on the microphone, the vibration characteristic signal is obtained according to the mechanical vibration, and the mechanical noise signal which is generated by the mechanical vibration and brought by airborne transmission is eliminated, so the microphone can be de-noised.

In order to provide an electric heat system that is quieter than those of the prior art, a switching circuit is incorporated into the controls for the heating system which provides for the heating elements of the electric heater to be kept at a more constant temperature than those of the prior art. The switching circuit regulates the output power to the degree desired while not inducing sharp changes in temperature of the coils of the electric heater and thus reduces the degree of rapid expansion and contraction of the coils and the enclosure for the heater. This in turn reduces the amount of mechanical noise produced by the electric heater while also reducing wear and tear on the heating element, the heater enclosure and objects near to the heater.

An apparatus for achieving in-situ micromechanics, microstructure and component integrated research in a scanning electron microscope belongs to the field of material microstructure and performance in-situ characterization. According to the apparatus, a double trapezoid leading screw transmission system is adopted, thus the apparatus is large in rigidity and high in test precision; the apparatus can stably operate in the scanning electron microscope, has low mechanical noise, and has low interference on scanning electron microscope imaging; the trapezoid leading screw has a self-locking function, thus the test can be paused and started at any time, continuity of test data is good; a sample clamp has a rotation function, thus when material extension/compression mechanical properties are measured, scanning electron beam imaging, EDS and EBSD integrated test can be satisfied at the same micro area; clamp support frames designed by the apparatus, the sample clamps and samples have the completely symmetrical structure, thus the samples receive the completely symmetrical extension/compression stress, and a geometric center of the sample, i.e., a deformation center, is located right under an electron beam all the time, thereby facilitating in-situ tracking dynamic research and high-quality microscopic scanning image acquisition.

The invention provides a programmable, power-efficient, hearing aid and cell phone-compatible system for selectively filtering continuous mechanical noise which includes a programmable, user-adjustable DSP comprising a multiband equalizer, noise reduction and anti-feedback function, and advanced gain control (AGC) volume control.

The invention discloses a method for separating noise sources of an automobile. The method comprises the following steps: firstly measuring exterior vehicle noise of an accelerating automobile under different working conditions so as to obtain first to fifth noise sound pressure level; secondly, calculating sound pressure level of tire noise, sound pressure level of power assembly mechanical noise, sound pressure level of power assembly combustion noise, sound pressure level of exhaust silencer housing noise and sound pressure level of exhaust port noise; and thirdly, calculating energy contribution ratio of tire noise, energy contribution ratio of power assembly mechanical noise, energy contribution ratio of power assembly combustion noise, energy contribution ratio of exhaust silencer housing noise and energy contribution ratio of exhaust port noise, so that five exterior noise sources of the accelerating automobile can be separated, the composition of the noise sources are accurately distinguished so as to accurately select adopted a denoising means and improve the denoising effect; the requirement on engineer experience through noise rectification is reduced, and the cost of manpower training for relevant enterprises is reduced; and a systematized solution is provided for the relevant enterprises through the noise rectification.

The invention relates to a prediction device and a prediction method for the remaining life of an operating mechanism of a circuit breaker. The device comprises the circuit breaker, a signal collection device, a data collection module, a central processing unit, an industrial personal computer and a wireless communication module. Signals collected by the signal collection device are output to an input end of the data collection module, an output end of the data collection module is connected with a universal I/O (Input/Output) interface of the central processing unit, and an output end of the central processing unit is connected with an input end of the industrial personal computer and an input end of the wireless communication module. According to the method, the closing time of the circuit breaker, the coil voltage of an electromagnetic valve, the coil current of the electromagnetic valve, the number of use, the mechanical noise, the ambient pressure, the ambient temperature and the ambient humidity are directly measured to predict the service life of the circuit breaker by using the device, so as to avoid error caused by modeling and parameter selection by conventional methods. The time sequence generated by collection quantity is used as an input of the model so that the input quantity is simple and accurate to extract and the prediction efficiency is high.

An apparatus and method for isolating a downhole tool section from hydraulic and mechanical noise. Anchoring grippers are used in conjunction with a fluid diverter valve to anchor the tool section to a borehole wall and divert fluid flowing in the drill string away from sensitive test equipment during formation testing.

The invention belongs to the technical field of air compressors, and relates to a low-noise structural oilless air compressor which comprises a cylinder, a cylinder cover and a piston, wherein the piston is provided with a sealing ring or a sealing leather cup made of a self-lubricating material, a crankcase is tightly connected with a crankcase cover plate and forms a crankcase intake muffler, an air intake one-way valve is arranged at an air intake or an air intake passage of the crankcase intake muffler communicated with the outside atmosphere, a damping pad is arranged between an exhaust valve plate and a valve seat, the valve seat is connected with a silencing cap, a crank pin is made into the shape of a spline or similar to the spline, a heat insulation hole or a heat insulation slot is arranged on a connecting rod body, and a heat insulation pad is arranged at the joint of a fastening bolt and the piston or a connecting rod. The low-noise structural oilless air compressor has the advantages that the air intake noise is low, the working temperature and the mechanical noise of a bearing are low, and an auxiliary balance block is arranged on a cooling fan, thereby reducing the vibration amplitude of the compressors, and effectively reducing the body vibration noise.

The invention discloses a powder metallurgical internal inclined gear, according to weight percent, containing elements Cu 1-3%, Ni 1-3%, Mo 0.1-1%, and the rest Fe and unavoidable component, where its spiral angle is not greater than 35 degrees, its pressure angle is 5-25 degrees, and its mode is 0.5-2.5 degrees. It mixes the alloy powder of Cu, Ni and Mo to make press molding, firing and shaping so as to make it. Its making mould is top, bottom and middle moulds and core stick. It gears stably and accurately, has small friction coefficient and low mechanical noise. It adopts special designed mould, presses by mould core's rotary ascending or descending along screw, which converts the rotary pressing into axial pressing, can press internal inclined gears of various spiral angles.

The embodiment of the invention discloses an air replenishing and enthalpy increasing air conditioning system and an air conditioner. The air replenishing and enthalpy increasing air conditioning system and the air conditioner are used for solving the problems that the air replenishing and enthalpy increasing air conditioning system generates periodic abnormal mechanical noise due to periodic pressure pulsation generated in an inner cavity of a compressor, and the air replenishing amount in an air replenishing loop cannot be flexibly controlled. The system comprises a compressor, the air replenishing loop and a control system. The air replenishing loop comprises a flash evaporator and a first electronic expansion valve. One end of the first electronic expansion valve is connected with an air replenishing opening of the compressor, and the other end of the first electronic expansion valve is connected with an air replenishing outlet of the flash evaporator. The first electronic expansion valve receives a control instruction sent by the control system. The opening degree of the first electronic expansion valve is adjusted according to the control instruction. The air replenishing and enthalpy increasing air conditioning system and the air conditioner are suitable for the technical field of air conditioning and refrigeration projects.

An electronic percussion instrument includes a head, a frame, and an impact sensor. The back of the head is divided into a main area (e.g. a main strike area) and an auxiliary area. At least one connecting part is arranged above or below the main area in the back of the head and reduced in thickness compared to the auxiliary area, thus reducing vibration from being transmitted through the head. The impact sensor is attached to the back of the main strike area of the head via a cushion member. When the main strike area of the head is being struck with a beater, a vibration is caused to occur in the head and detected by the impact sensor to produce an electric signal which is used to generate an electronic musical sound while suppressing mechanical noise due to an impact between the beater and the head.

The invention relates to a noise measuring system for an engine accessory system in a hemi-anechoic room. A load is respectively applied to a power steering pump, an electric generator and an air compressor in an accessory system, thus each accessory is enabled to work under the load, and a measuring result is enabled to be closer to life. The accessory system (3) is arranged on a testing motor (2), the testing motor (2) is arranged on a bench in the semi-anechoic room, the testing motor (2) is connected with a power measurement machine (1) through a transmission shaft, a crankshaft of the testing motor (2) is driven to rotate by the power measurement machine (1), and the accessory system (3) is driven to work by the testing motor (2); and a microphone (10) is arranged around the testing motor (2) , the noise of the accessory system (3) at work is collected by the microphone (10), and the noise is provided to a processing unit for processing and collection. By adopting the noise measuring system, interference brought by combustion noise of the testing motor, noise of induction and exhaust, and mechanical noise of a motor body and the like are eliminated, and the noise of the engine system is measured more accurately.

The invention relates to biodegradable lubricating grease which comprises the following components according to mass percent: 80%-85% of base oil, 12%-10% of a thickening agent and 8%-5% of other additives. Vegetable oil, fatty acid ester and poly-alpha-olefin (PAO) are compounded to form the base oil of the biodegradable and environment-friendly lubricating grease, and fatty acid or animal and vegetable oil lithium calcium soap is taken as the thickening agent. The biodegradable lubricating grease composition is good in combination property, and all performance indexes of the composition reach using requirements; organic copper and organic molybdenum are compounded to form an antioxidant, so that the biodegradable lubricating grease is good in internal synergistic effect, and the wear resistance and the high-temperature oxidation stability of the grease can be improved; and mechanical noises can be effectively reduced since the organic molybdenum is added into the lubricating grease. The biodegradable lubricating grease can meet increasingly stringent environmental protection and energy conservation requirements and is suitable for lubricating and sealing of various mechanical friction pairs.

A method for controlling noise including combustion noise of an internal combustion engine includes (a) setting an engine noise target value and a cylinder pressure level target value, (b) determining a first comparison value by subtracting a measured cylinder pressure level from the cylinder pressure level, (c) receiving an engine noise parameter stored in an ECU, (d) determining the engine noise using the engine noise measured at step (c), (e) determining a direct correlation coefficient, an indirect correlation coefficient, mechanical noise, and flow noise through a proportional integral controller, (f) performing correction, (g) controlling the engine based on the value decided at step (f), (h) measuring a combustion pressure after step (g), (i) converting the combustion pressure into a cylinder pressure level within a predetermined crank angle after step (g), and (j) determining direct combustion noise of the engine noise after step (h).

A pneumatic module includes an actuator assembly and a manifold. The actuator assembly includes a main body having a bore, an armature, overmolded primary and secondary plates, a coil and a frame. The manifold includes a valve seat, a control port and a supply port. When the actuator is in a de-energized state, the armature is forced against the valve seat by a spring, sealing off the supply port from the control port. When the actuator is in an energized state, current flows through the coil, thereby generating a magnetic field. The magnetic field forces the armature to move toward the primary plate, causing the valve seat becomes unsealed. Once the valve seat is unsealed, fluid flow is permitted between the supply port and the control port. The one end of the armature has an endcap to minimize mechanical noise generated by movement of the armature against the spring. The frame surrounding the actuator assembly has flanges extending from both ends. These flanges correspond to wells located within the manifold. The flanges and wells are configured such that when the flanges are inserted into the wells, the actuator assembly can be twisted and locked into the manifold without requiring additional traditional fasteners, such as bolts or screws.

The invention discloses a vacuum pump without pressure difference, which comprises a main body of the vacuum pump, an aspirating hole of the vacuum pump and an exhaust hole of the vacuum pump are arranged on the main body of the vacuum pump, the main body of the vacuum pump is sealed in a housing, and an air inlet and an air outlet are arranged on the housing. The main body of the vacuum pump without the pressure difference is sealed in the housing, when the vacuum pump works, the air inlet on the housing is connected with a device which needs to carry out air aspiration, so that the pressure in the housing is far lower than the pressure outside the housing, the pressure different is acted on the hermetic housing generally, and the main body of the vacuum pump can work under the relatively vacuum state; therefore, a motor of the main body of the vacuum pump always runs under the state without the pressure difference, and the vacuum pump can greatly reduce the power loss, always keep the running state smooth and prolong the service life of the motor. Simultaneously, as the interior of the housing is in the vacuum state almost, the vacuum pump can effectively isolate the mechanical noise produced when the pump body runs, and reduce the noise produced by the vacuum pump.

The invention relates to a speed changing device, which comprises a first permanent magnet motor, a coaxial magnetic gear and a second permanent magnet motor, wherein the first permanent magnet motor, the coaxial magnetic gear and the second permanent magnet motor constitute a concentric type structure of a coaxial topological structure set. The speed changing device realizes harmonic driving and speed regulation by a magnetic field modulation effect of a non-uniform magnetic circuit. Because the coaxial magnetic gear realizes non-contact speed variable driving by the interaction of permanent magnets, the speed changing device can overcome the defects of friction loss, mechanical noise and vibration, and the need of regular maintenance and lubrication brought by the mechanical gear when the speed changing device is used for an automobile under hybrid and electric force two modes.

A tea reciprocating sifting machine comprises a machine frame, a sifting bed and a drive mechanism of the sifting bed, wherein the sifting bed comprises a feed port, a discharge port and a sifting mesh module, the drive mechanism comprises bearing components. The tea reciprocating sifting machine is characterized in that the sifting bed is positioned above the machine frame in a hinged connection mode through a plurality of rocker arms which are arranged obliquely, and the lower ends of all the rocker arms are respectively hinged on the same drive frame; the sifting mesh module is arranged inside a sealed outer cover and is composed of an upper-layer sifting mesh, a lower-layer sifting mesh and a plurality of mesh-scraping elastic balls, and the plurality of mesh-scraping elastic balls are regionally arranged between the upper-layer sifting mesh and the lower-layer sifting mesh; and the drive hinged parts of the rocker arms or the drive mechanism are all provided with buffer pads. The tea reciprocating sifting machine has the advantages of being high in reciprocating sifting efficiency, little in tea contamination and low in mechanical noise and labor intensity, and is a tea refining and sifting machine which can meet the streamlined, clean and modernized mass production requirements.