118results about How to "Reduce angular velocity" patented technology

When it is determined that a malfunction has occurred in a rotational angle sensor, an electronic control unit changes the control manner from the normal assist control to the sensorless assist control. In the sensorless assist control, an assist stop command unit receives the information concerning the motor rotational angular speed ωm from an angular speed conversion unit. Then, the motor rotational angular speed ωm is compared with the threshold value ωm1. If the motor rotational angular speed ωm is equal to or higher than the threshold value ωm1, an assist enabling signal is transmitted to a PWM voltage production unit to continue the power assist. On the other hand, if the motor rotational angular speed ωm is lower than the threshold value ωm1, a stop command signal is transmitted to the PWM voltage production unit to stop the power assist.

A mobile telecommunications device comprising: an inkjet printhead for printing to a media substrate; a media feed assembly for feeding the media past the printhead; a print engine controller for operatively controlling the printhead; and, a position sensor for providing the print engine controller with a signal indicative of the position of the media substrate relative to the printhead; such that, the print engine controller differentiates the signal to derive the speed of the media substrate relative to the printhead and adjusts the operation of the printhead in response to variations in the speed.

A mobile telecommunications device comprising: an inkjet printhead for printing to a media substrate; a drive shaft for feeding the media past the printhead; and, a print engine controller for operatively controlling the printhead; wherein during use, the print engine controller senses the number of complete and partial rotations of the media feed roller and adjusts the operation of the printhead in response to variations in the angular velocity of the drive shaft.

A robot includes: an arm with one end pivotally supported; a driving source that pivots the arm; an angle sensor that detects a pivot angle of the driving source and outputs pivot angle information of the driving source; an inertia sensor that is attached to the arm and outputs inertial force information of an inertial force acting on the arm; a control command generating unit that outputs a control command defining rotational operation of the arm; a control conversion determining unit that determines whether the inertial force information is used or not when the driving source is controlled to control operation of the arm; and an arm operation control unit that performs a first control based on the control command, the pivot angle information, and the inertial force information, to control the driving source and thus control the operation of the arm, if the control conversion determining unit determines to use the inertial force information, and performs a second control which is different from the first control, based on the control command and the pivot angle information, to control the driving source and thus control the operation of the arm, if the control conversion determining unit determines not to use the inertial force information.

An automatic transmission assembly having a transmission unit including a plurality of gear pairs, a shift drum, a pair of clutches; and a controller. The controller performs a preliminary upshifting action in advance for angularly moving the shift drum depending on a next gear position in an upshifting direction while rotary drive power is being maintained at a given gear position, and when an upshifting command is output, the controller engages one of the clutches simultaneously with the command. When a downshifting command is output, the controller performs a preliminary downshifting action in advance based on the downshifting command. The partially neutral positions are provided between predetermined angular positions on the shift drum for temporarily reducing the angular speed of the shift drum when the shift drum is being angularly rotated.

The invention relates to a high-frequency torsion and axial bidirectional impactor, and belongs to the technical field of oil and gas field well drilling and well repairing tools. The high-frequency torsion and axial bidirectional impactor comprises a housing, a connector, an alignment bearing, a turbine shaft, an upper hammer body and a lower hammer body, wherein the connector is mounted at one end of the housing in a threaded manner; the lower hammer body is glidingly mounted at the other end of the housing through an end cover and a buffer spring, and the turbine shaft is mounted in the housing through a nut; a turbine rotor and a stator are mounted at one end of the turbine shaft, and the upper hammer body is mounted at the other end of the turbine shaft. By adopting the high-frequency torsion and axial bidirectional impactor, contact stress between a drill bit and rock can be effectively increased, and crack expansion in a broken pit can be effectively improved, so that the rock breaking efficiency of the drill bit can be improved; the problems that when a conventional rotating well drilling mode is adopted, the well drilling efficiency is degraded, the service life of the drill bit is shortened, the well drilling period is long and the cost is high when a hard stratum is encountered can be solved; the high-frequency torsion and axial bidirectional impactor has active popularization meanings in well-drilling efficiency improvement and well drilling cost reduction.

A mobile connectivity and self-generating illumination electric scooter comprises a step-through frame, and is operable as a plug-in electric vehicle with two or three wheels operational inside the wheels. A rechargeable battery stores electricity to drive the electric motor. The scooter also includes: a glossy finish, a rectangular front frame member, an aerodynamic manual brake fin, a communication device support member, detachable floor and front panels having multiple colors and designs, On/Off digital locking system, an accelerator handle and a brake handle differentiated by color; and further, an integral computer, an integrated router forming a Wi-Fi hotspot, a daytime running lamp, a help switch, a sound system, a camera for livestream and social media synchronization, a communication device charger, an integral GPS. The mobile communication device is in communication with, and controls at least one of: the integral computer, the Wi-Fi hotspot, speaker system, camera, help switch, and the GPS.

A method for reducing the angular momentum of a spacecraft comprises a propulsion device able to generate a torque along a Z axis corresponding to an axis of maximum inertia or minimum inertia of the spacecraft, an X axis and a Y axis forming with Z an orthogonal frame; an angular momentum accumulating device, able to generate an angular momentum and a torque along the three axes; and a set of sensors able to measure the angular velocities and estimate the angular momentum of the spacecraft. The method comprises a first step of aligning the angular momentum of the spacecraft along the Z axis, consisting in slaving the angular momentum of the angular momentum accumulating device to the angular velocity of the spacecraft, and a second step of reducing the angular momentum of the spacecraft using a torque generated by the propulsion device.

The invention discloses a small satellite formation design method for realizing space debris racemization by utilizing an eddy current effect. Small satellites launched by a spacecraft platform are formed into groups according to the position of debris with respect to the spacecraft platform and external dimensions of the debris. Four of the small satellites are released by the spacecraft platform to around the target debris, and the small satellites unwind energized solenoid coils and solar panels and form a natural circular or elliptical formation centered on the target debris by controlling positions and velocities of the small satellites during the release. Through the attitude control, the energized solenoid coils of the small satellites are facing right towards the target debris, a magnetic field is generated to the energized solenoid coils, the solar panels supply the required power to racemase the debris, the angular velocity of the rolling of the debris is reduced, and quick racemization of the high-speed rotating space debris is realized. By the method, as the multiple small satellites carry the energized solenoid coils, the strength of the magnetic field is increased, and the rotational angular velocity of the high-speed rotating debris can be rapidly reduced.

A method of controlling at least part of a start-up or re-light process of a gas turbine engine, the method comprising: determining when a flame in a combustion chamber of a gas turbine engine is extinguished, during a start-up process or re-light process or during operation; purging the combustion chamber by controlling rotation of a low pressure compressor using a first electrical machine, and controlling rotation of a high pressure compressor using a second electrical machine, the combustion chamber downstream of the low pressure compressor and high pressure compressor; and controlling rotation of the low pressure compressor using the first electrical machine, and controlling rotation of the high pressure compressor using the second electrical machine to restart the start-up process or perform the re-light process.

The invention relates to a rotating ejection device for small and medium unmanned aerial vehicles, which is characterized in that two motors are fixedly arranged on a stand column of an ejection frame; gears of the two motors are respectively installed on output shafts of the two motors; a gear disc is sheathed on the gears of the two motors, and the inner teeth of the gear disc are engaged with the gears of the two motors; a counterweight bar and a linkage crossbar are arranged above the gear disc, are symmetrically clamped and sheathed on a supporting bar and are tightly fixed through two fastening pieces; a counterweight is installed on the counterweight bar and can slide along the counterweight bar; one end of a movable swing arm is hinged with the end of the linkage crossbar through a connecting piece; and the other end of the movable swing arm is hinged with an unmanned aerial vehicle gripping and releasing mortise lock. By controlling the rotating speed of the motors of the rotating ejection device to control the ejection speed of the small and medium unmanned aerial vehicles to be within 0 to 50m/s, the overload of the small and medium unmanned aerial vehicles during takeoff can be effectively reduced, and the service lives of the unmanned aerial vehicles can be prolonged. The rotating ejection device for the small and medium unmanned aerial vehicles has the characteristics that the production cost and the using cost are low, the occupied area is small, the device is convenient to operate and can be mounted on vehicles and ships for use.

A lower platform and an upper platform are connected first and second levers having different lengths, each lever being articulated about a first axis on said lower platform and a second axis on said upper platform. The upper platform can be swiveled from a rest position to a position of maximum excursion relative to the lower platform so that the distance between platforms is immediately reduced upon swiveling from the rest position. At least one axis is provided with a brake which slows down rotational movement.

The present invention discloses a circular cutter processing cutter-axis vector smoothing method based on an AB type five-axis CNC machine tool. The method comprises the following steps: establishing a relation equation between a circular cutter cutter-axis vector and a cutter spacing design vector; establishing a motion conversion equation between the circular cutter cutter-axis vector and the five-axis CNC machine tool revolving axles A and B; establishing a relation equation between the circular cutter cutter-spacing design vector and the five-axis CNC machine tool revolving axles A and B; determining the design variable, the target function and the constraint condition of the circular cutter processing cutter-axis vector smoothing, and establishing a circular cutter processing cutter-axis vector smoothing mathematical model based on the AB type five-axis CNC machine tool; and determining the solution method of the above cutter-axis vector smoothing mathematical model. The circular cutter processing cutter-axis vector smoothing method based on the AB type five-axis CNC machine tool can avoid the rapid changing of the machine tool revolving axles, allow the machine tool revolving axles to perform more stable and smooth motion, greatly reduce the angular velocity and the angular acceleration of the machine tool revolving axles so as to improve the processing quality and the processing efficiency of the curved surface and have a high practical application value.

The invention discloses a top-bottom variable-friction energy dissipation self-resetting prestressed concrete beam-column joint device which comprises a precast concrete column, a precast concrete beam located on one side of the precast concrete column, and a variable-friction energy dissipation device connecting the precast concrete column with the precast concrete beam. The variable-friction energy dissipation device comprises a middle friction steel plate with a fluctuating face, an outer friction steel plate with a fluctuating face, and an inner friction steel plate connected to the precast concrete beam. The high-order mode effect of a structure can be lowered, the energy dissipation capacity of the structure under the earthquake effect is improved, residual deformation of the precastfabricated reinforced concrete structure under the earthquake effect is reduced or eliminated, and obvious plastic deformation is prevented from occurring to main body structural components such as the precast beam and column.

An interactive system and method for virtual ride-sharing with electric vehicle allows a vehicle operator to operate the electric vehicle, like an electric scooter, while simultaneously interacting with network users to share a riding experience through a social media site and the Internet directly from the electric vehicle. An in-vehicle camera captures vehicle data and posts vehicle data to a social media site. The vehicle operator performs social networking functions like: uploading content, downloading content, posting riding images, livestreaming content, and interacting with others on social media while operating electric vehicle. The electric vehicle comprises a step-through frame and is operable as a plug-in electric vehicle having electricity stored on board in a rechargeable battery to drive an electric motor. The vehicle has a slim aesthetic design, an aerodynamic manual brake fin, a mobile communication device holder, and an accelerator handle and a brake handle differentiated by color.

Maintaining the linear velocity of an oil impregnated web oiler as the oil impregnated web is wound onto a driven take-up roll. When a new oil impregnated web is installed, the take-up roll is initially driven at an angular velocity to yield the predetermined optimum linear velocity of the oil impregnated web. The angular velocity of the take-up roll is decreased according to the algorithm of the invention so as to maintain constant the linear velocity of the oil impregnated web as the oil impregnated web is wound onto the take-up roll.

Provided is a cyclone device with which the efficiency in separating out and collecting a fine powder of sub-micron size can be increased. The cyclone device is for separating out and collecting, from a swirling airflow, a powder mixed into the airflow, and is characterized by being provided with an airflow introduction section (12) that has an airflow introduction part (14) for introducing a powder mixture airflow from the tangential direction and that gradually increases in diameter going downward, and an inverted cone-shaped conical section (13) that is connected to a lower end of the airflow introduction section (12) and gradually decreases in diameter going downward.

A coaxial and co-cylindrical multistage positive and negative rotation transmission method comprises multistage gear engagement rotation transmission consisting of a driving wheel, a plurality of driven wheels and multistage auxiliary gear banks, the driving wheel is provided with two side gears, each driven wheel is provided with two side gears, the driven wheels are coaxially serially connected with the driving wheel, and the multistage auxiliary gear banks are uniformly distributed between the driving wheel and each driven wheel and between each two driven wheels, are respectively engaged with the side gears of the driving wheel and the driven wheels, and are provided with input auxiliary gears and output auxiliary gears. The coaxial and co-cylindrical multistage positive and negative rotation transmission method is characterized in that the side inner gear or the side outer gear of the driving wheel is engaged with the power input auxiliary gears so that rotation power is transmitted to the power input auxiliary gears, the power input auxiliary gears transmit the rotation power to the power output auxiliary gears via connecting shafts, and the power output auxiliary gears are engaged with the side inner gears or the side outer gears of the driven wheels so that the rotation power is transmitted to the driven wheels. The invention further provides a coaxial and co-cylindrical multistage positive and negative rotation transmission.

A vibrating gyroscope includes a vibrator having a pair of vibrating bodies, both end portions in the longitudinal direction of which are fixed together in the thickness direction by intermediate parts and the vibrator is supported such that a secondary bending vibration with both ends free in the thickness direction of the vibrating bodies can be performed. The vibrating gyroscope also includes a driver for causing the vibrating bodies to perform buckling vibrations in opposite directions, and a detector for detecting the magnitude of the secondary bending vibration of the vibrator. The resonance frequency of the secondary bending vibration is close to the frequency of the buckling vibrations.