741results 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.

The present invention is directed to a system and method which allows each end-user (or a combined number of end-users) to set controls for each of the user's energy using systems at one or more premises. Each end-user, for each premise, then can determine, based on a digital copy of a holistic view of the premise, how it will manage the premises. In one embodiment, this system and method ties into a network of sensors which, in turn, is tied into a larger service network that controls the distribution system services throughout a wide area. In operation, in one embodiment, sensors associated with each system, appliance, or piece of equipment on a premise feeds data back to a main control unit serving that premise or the plurality of premises so as to form the digital copy. The digital copy can also be fed to larger nodes which, in turn, can feed the data to the wide area service

Control systems and methods for power amplifiers operating in envelope tracking mode are presented. A set of corresponding functions and modules are described and various possible system configurations using such functions and modules are presented.

A control device of a variable damping force damper for controlling a damping force of a damper used in a vehicle suspension system comprises: relative displacement detection means for detecting a value corresponding to a relative displacement between a vehicle body and a wheel in a vertical direction; relative speed detection means for detecting a value corresponding to a relative speed between the vehicle body and the wheel in the vertical direction; multiplying means for multiplying the value corresponding to the relative displacement and the value corresponding to the relative speed; and means for setting a damping force control target value of the damper based on the output from the multiplying means.

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 phaser which includes a housing and a rotor disposed to rotate relative to each other is provided. The housing has at least one cavity disposed to be divided by a vane rigidly attached to the rotor. The vane divides the cavity into a first chamber and a second chamber. The phaser further includes passages connecting the first and the second chamber, thereby facilitating the oscillation of the vane within the cavity. The phaser includes: a) a valve disposed to form at least two openings for fluid flowing between the first chamber and the second chamber and being disposed to keep at least one opening closed; and b) at least one by-pass disposed to stop or slow down the rotation between the housing and the rotor, thereby allowing a locking mechanism to lock the housing and the rotor together independent of fluid flow.

The invention discloses a traversal control system and method of a driverless automobile based on a hybrid theory. The system comprises a sensing module, a path planning module, a hybrid controller module, a steering executing module and a display module. The sensing module is used for acquiring the vehicle travelling environment and the vehicle operating state; the path planning module is used for planning a path based on the absolute position of a vehicle in a map and the position of the vehicle relative to peripheral obstacles and a lane line; the hybrid controller module comprises a local controller unit and a switching monitoring controller unit; the local controller unit designs a controller meeting a target for working conditions of lane-keeping, lane conversion and emergent collision avoidance; the switching monitoring controller unit driven by different discrete events drives effective mode switching, so that the switching stability is guaranteed; the steering executing module drives a steering motor according to a signal of the hybrid controller so as to realize automatic steering of the driverless automobile; and the display module is used for displaying sensing information, path planning information and control mode information.

Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a vector controlled motor drive system when the multi-phase machine operates in an overmodulation region. The disclosed embodiments provide a mechanism for adjusting a duty cycle of PWM waveforms so that the correct phase voltage command signals are applied at the angle transitions. This can reduce variations/errors in the phase voltage command signals applied to the multi-phase machine so that phase current may be properly regulated thus reducing current/torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.

A control device calculates a voltage command value of a voltage step-up converter based on a torque command value and a motor revolution number and calculates the on-duty of an NPN transistor based on the calculated voltage command value and a DC voltage from a voltage sensor. Under the conditions that the on-duty is influenced by a dead time and the DC voltage is smaller than a predetermined set value, the control device controls NPN transistors to step-up or step-down the voltage while fixing the on-duty at 1.0.

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.

The invention provides an air conditioner control method which comprises the steps of under a dehumidification mode, detecting the temperature of a heat exchange pipe of the air conditioner; judging whether the temperature is greater than a first preset threshold value; when the temperature is greater than the first preset threshold value, controlling the air conditioner to run under a normal dehumidification mode; when the temperature is smaller than the first preset threshold value, increasing the temperature of the heat exchange pipe by adjusting the running frequency of a compressor of the air conditioner and/or the rotating speed of an indoor fan so as to ensure that the air conditioner runs under the dehumidification mode efficiently and stably. The invention also provides an adaptive dehumidification control system and an air conditioner.

For the purpose of reduced NOx gas emission, a gas turbine engine comprises a cylinder having a combustion region inside of the cylinder; a resonator having a cavity and provided around the surface of the cylinder and sound absorption holes formed on the cylinder and having opening ends on the cylinder.

Device and method for a damping function to reduce undesirable mechanical transient responses to control signals. In one aspect of the present invention, the damping function may be used to reduce overshoot and oscillation when a digital micromirror is driven from a landing plate to the flat or neutral position. In another aspect of the present invention, the damping function may be used to reduce transient resonance of a digital micromirror when the micromirror is driven to a landing plate.

The invention discloses an LNG storage tank for a diesel-LNG hybrid power ship. The LNG storage tank comprises a sealed shell and a sealed inner container arranged in the shell, wherein the shell is provided with a first LNG filling pipe communicated with the bottom of the inner container; the inner container is supported in the shell through a plurality of glass steel pipe struts, and a heat insulation layer is wound on the inner container; an interlayer between the shell and the inner container is vacuum; the middle part of the inner container is provided with a wave-proof device; the wave-proof device comprises a central pipe and a support plate; the axis of the central pipe is superposed with the axis of the inner container; and the support plate is trumpet-shaped, an opening at the small end of the support plate is welded with the outer circumference surface of the central pipe, and an opening at the large end of the support plate is welded with the inner wall of the inner container. Because the wave-proof plate with a special structure is arranged in the inner container, impact and oscillation of liquid in the tank body in each direction when the ship runs are reduced, and the safety is ensured. Meanwhile, the LNG storage tank provides proper liquid storage volume and good heat insulation performance, and is fully suitable to be used in the ship.

A Micro Electronic Mechanical System (MEMS) scan controller generating clock frequency and a control method thereof are disclosed. The MEMS scan controller is for a MEMS mirror in a bi-direction laser scanning units (LSU). By detecting resonant frequency of the MEMS mirror, the scan controller sends frequency modulation signal and amplitude modulation signal of the MEMS mirror to a bridge circuit of the MEMS mirror for adjusting and stabilizing the MEMS mirror. A clock signal corresponding to the resonant frequency of the MEMS mirror at the moment is also sent so that scan data is sent within the effective scanning window in forward direction/reverse direction. Thus high-precision scanning is achieved.

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 alternately formed on an outer circumference thereof and a central through hole, the rotor core having a key axially extending on an outer circumference, the rotor core being divided into a plurality of blocks, the core materials constituting one of at least three blocks having the magnetic concave and convex portions shifted by a predetermined angle in one of a rotating direction of the rotor and a direction opposite the rotating direction of the rotor relative to a center line passing the key, the core materials constituting each one of the blocks located at both ends of the one block having the magnetic concave and convex portions shifted by a predetermined angle in the other of the rotating direction of the rotor and the direction opposite the rotating direction of the rotor relative to a center line passing the key, and a rotational shaft inserted through the central hole of the rotor core, the shaft having a key groove engaging the key of the rotor core.

A method for measuring the pitch angle of a wind turbine rotor blade is provided. In the method at least one image of at least part of the rotor blade is acquired by a camera from a defined position and the pitch angle is calculated by means of data from the at least one image.

The invention relates to a DC distribution system energy storage device adaptive virtual impedance droop control method, which is applied to multi-converter parallel control in a DC distribution system. The method comprises the steps of 1) acquiring electric power parameters of the DC distribution system, establishing a double closed-loop controller which consists a voltage outer loop and a capacitive current inner loop, and establishing a DC distribution system droop control model; 2) introducing virtual impedance ZD(s) into a part between converter output current and converter reference voltage signals of the double closed-loop controller in the DC distribution system droop control model so as to act as negative feedback, and acquiring equivalent output impedance Zov(s); and 3) enabling the equivalent output impedances Zov(s) corresponding to a plurality of lines to be equal through setting values of different virtual impedances ZD(s), and thus averaging output power and power distribution of the plurality of lines in the DC distribution system. Compared with the prior art, the method provided by the invention has the advantages of shock suppression, simple algorithm, low cost and the like.