742results about How to "Reduce oscillation" patented technology

A microfluidic device comprises pumps, valves, and fluid oscillation dampers. In a device employed for sorting, an entity is flowed by the pump along a flow channel through a detection region to a junction. Based upon an identity of the entity determined in the detection region, a waste or collection valve located on opposite branches of the flow channel at the junction are actuated, thereby routing the entity to either a waste pool or a collection pool. A damper structure may be located between the pump and the junction. The damper reduces the amplitude of oscillation pressure in the flow channel due to operation of the pump, thereby lessening oscillation in velocity of the entity during sorting process. The microfluidic device may be formed in a block of elastomer material, with thin membranes of the elastomer material deflectable into the flow channel to provide pump or valve functionality.

An interior rearview mirror system for use in a vehicle includes a mirror support assembly for attachment to the interior of a vehicle. The mirror support assembly comprises a first electronic accessory such as an imaging sensor. A reflective mirror element is disposed in a housing, the housing being pivotally adjustable about the mirror support assembly via a pivot element. The housing includes second and third electronic accessories at least partially controlled by a microprocessor. The mirror support assembly preferably includes a wire passageway for wires passing into the housing for the reflective mirror element. The second and third electronic accessories may be a headlamp controller and automatic dimming circuitry, or may be selected from a variety of other devices such as a garage door opener, an INTERNET interface, a video device, a trip computer, a light, or other items. The mirror assembly may also be in wireless communication with an external device.

An active acoustic noise reduction system which comprises a single input transducer and an output actuator that are physically located next to each other in the same location. In one embodiment, the input transducer and the output actuator are a hybrid represented by a single element. The active noise reduction system is located as close as possible to the noise source and functions to generate an antinoise cancellation sound wave with minimum delay and opposite phase with respect to the noise source. The noise reduction system also comprises a non linearity correction circuit, a delayed cancellation circuit and variable gain amplifier. The system provides user control of the quiet zones generated by the system by varying the gain of the variable gain amplifier. The system provides a user with the ability In one embodiment, an echo canceler is utilized to remove echoes fed back from the output actuator. In another embodiment, an input decoder is used instead of an echo canceler to remove feedback picked up from the output actuator.

An agricultural harvesting machine embodying a forage harvester includes a comminution assembly with a drum equipped with a plurality of knives. The drum is set into rotation opposite a stationary shear bar in order to comminute crop fed in a region of a cutting gap formed by knives and the shear bar during the harvesting operation. A device controls a rotational speed (n) of the drum at least during a maintenance procedure of the comminution assembly, depending on a property of the drum.

A system and method for actively damping driveline oscillations in a motor vehicle having a traction motor to drive a vehicle's drive wheels and an antilock brake system (ABS). A traction motor controller controls a torque output signal of the motor to effectively to dampen driveline oscillations during an ABS operation. A proportional, a proportional derivative, or a derivative controller may be used to generate the torque output signal based on at least one of motor speed, an average of the drive wheel speeds, a difference in the two speeds, a motor angular acceleration, an average wheel angular acceleration, and a difference in the angular accelerations. Motor speed signals and average drive wheel speed signals may be filtered to eliminate high frequency components of each speed signal. Additionally, amplitude of the torque output signal may be limited within a positive upper and a negative lower active motor damping limit.

A rotor for a reluctance type rotating machine includes a rotor core formed by stacking a number of annular core materials each of which includes magnetic concave and convex portions. The rotor core has two keys which are formed at two positions on an inner circumference of the rotor core. The positions are spaced 180 degrees apart from each other with respect to the rotor core. The rotor core is divided into a plurality of blocks and the core materials constituting at least one block have the magnetic concave and convex portions shifted by a predetermined angle relative to the core materials constituting the other or another block on the basis of a center line passing through the keys. A whole or part of the core materials of at least one block are located circumferentially 180 degrees apart form the core materials constituting the other or another block.

A system and method for optimal adjustment of gain of a network amplifier, and for substantially reducing oscillation produced by a network amplifier. The network amplifier includes first and second antennas for the transmission of signals between a handset and a base station. The signals are amplified by first and second variable gain modules by an amplification factor as determined by a control circuit. The control circuit determines the optimal value of the amplification factors by analyzing the signals. In the event that an oscillation is detected, the control circuit adjusts the amplification factors in a manner that substantially reduces the oscillation.

A system and method for substantially reducing oscillation produced by a network amplifier. An exemplary method includes receiving a cellular signal at a first antenna of a network amplifier and applying a first amplification factor to the cellular signal. The resultant amplified cellular signal is transmitted to a target destination via a second antenna. A first signal level of the cellular signal is measured while the first amplification factor is being applied to the cellular signal. Then, a second amplification factor that is less than the first amplification factor is applied to the cellular signal, during which a second signal level of the cellular signal is measured. If the second signal level is significantly less than the first signal level, the first amplification factor is reduced by a predetermined amount.

A vehicle wheel driving apparatus arranging structure has a road wheel 27, a road wheel supporting member 71 connected to a vehicle body via a suspension 31 to support the road wheel 27, and a motor 72 rotating a road wheel side of the road wheel supporting member 71. A center of gravity of the motor 72 is disposed higher than a center C of the road wheel 27, a plurality of arms 32 to 36 which make up the suspension 31 are disposed to support the road wheel supporting member 71, at least one of the arms 32 to 36 is disposed higher than the center of the road wheel 27, and one end of the arm 32 which is disposed higher than the center C of the road wheel 27 is connected to a motor housing 93 of the motor 72.

The invention relates to a tissue morcellator for minimally invasive surgery. The morcellator has a metallic cutting ring mounted on a visually transparent hollow cylinder, which in combination with a visually transparent outer morcellator tube enables a surgeon to visualize the inside of the morcellator shaft for detection of loose tissue fragments in the device. A tenaculum used with the morcellation device has a spacer for preventing contact with the blade. The cutting tube can oscillate, rather than rotate, along the longitudinal axis of the cutting tube. The morcellator utilizes an extendable tissue guide on the outer tube of the morcellator shaft for preventing the tissue from rotating along the longitudinal axis of the morcellator tube. This allows the tissue to be continuously rotated into the morcellator device for continuous peel. The tissue guide can also be fully retracted to allow for coring of the bulk tissue.

The invention belongs to the technical field of facility agriculture environment control, and environment factors such as temperature, humidity, illumination intensity, CO2 concentration and the like in a greenhouse can be intelligently controlled. According to the greenhouse environment intelligent control method, a concept of a global variable is set, internal and external environment parameters in the greenhouse, current operating states of all controllers and local weather forecast for the next eight hours are used as all variables of a system, so as to be called global variables; and on this basis, a greenhouse environment prediction model based on the global variables is provided, and a BP (Back Propagation) artificial neural network is adopted to establish the model. By utilizing the model and combining fuzzy control, the greenhouse environment control method based on the global variables is invented. The greenhouse environment control method comprises the following steps that all of the global variables are used as input values, internal environment states of the greenhouse are predicted, and advanced adjustment is performed by the controllers in accordance with prediction results. By using the greenhouse environment intelligent control method, the problems of response lag, passive adjustment, inconsistent adjustment of the controllers and the like of traditional greenhouse environment control are solved, lag and oscillation in a response process are reduced, and the quality control of the greenhouse is improved.

The invention relates to a testing method and device for dynamic switching characteristics of an IGBT (Insulated Gate Bipolar Transistor) by utilizing a double-pulse technology. A double-pulse signal is sent out through utilizing a signal chip microcomputer; a tested IGBT reaches rated working current by a first pulse and a second pulse is used for testing dynamic characteristics of the IGBT; and dynamic voltage and current parameters of the IGBT in a switching-on / off process are tested by utilizing an oscilloscope and a difference isolating probe. The double-pulse signal passes through an IGBT driving board to control the IGBT to be switched on / off in extremely short time; an experiment circuit and a testing circuit are isolated through an isolation transformer so that mutual interference of the signals is avoided; current of a main circuit and voltage at two ends of the IGBT, and voltage at an output end of a driving circuit are measured by utilizing the isolation transformer, the oscilloscope and the difference isolating probe; an oscillogram is recorded by the oscilloscope; and dynamic switching characteristic parameter sizes of the IGBT are calculated according to ascending and descending time, delaying time and on-off energy. Parasitic parameters in the circuits are reduced and a testing result is accurate.