82results about How to "High dynamic stiffness" patented technology

Active hydraulic anti-vibration mount comprising two support elements connected by an elastomer body partially delimiting a working chamber filled with liquid, this working chamber communicating by a throttled passage with a compensation chamber separated from said working chamber by a rigid partition. The rigid partition is penetrated by a first regulating nozzle closed by a movable exciting device, and a second regulating nozzle closed by a valve the movements of which are limited to correspond to an amplitude of variation in the volume of the working chamber which is less than 20% of the amplitude of the variations in volume generated by the exciting device.

The invention discloses a flexible supporting method of a large-aperture lens, which comprises the steps of; firstly, machining three bosses on the excircle of a circular lens base with a certain thickness at intervals of 120 DEG , machining a connecting part with a cuboid structure on the outer side of each boss, machining an installing hole and a pin hole on the outer side of each boss along the radial direction of the lens base, machining an installing hole and a pin hole on the connecting part along the axial direction of the lens base, machining an installing hole on each boss along the axial direction of the lens base, and machining a small boss with a step on the inner side of each boss; secondly, machining three corresponding installing surfaces on the excircle of the lens at intervals of 120 DEG, and machining radial flexible elements and axial press plates; thirdly, bonding the radial flexible elements with the lens, and fixing the bonded assembly in the lens base through the installing holes and the pin holes; and finally, tightly pressing the lens through the axial press plates, and fixing the axial press plates through the installing holes. According to the supporting method disclosed by the invention, positioning precision of the lens is integrally improved, stress environment of the lens under an assembling condition is improved, and optical aberration such as field curvature, astigmatism and the like can be eliminated.

A hydraulic device disposed in a torque strut so as to provide a fully decoupled hydraulic torque strut. A main rubber element vibrates in response to powertrain pitch torque. At high vibration amplitude, high hydraulic damping is provided via a pumping chamber, an inertia track and a bellowed compensation chamber, wherein a decoupler system hydraulically connected to the pumping chamber is passively disabled. At low vibration amplitude, minimal hydraulic damping is provided via the decoupler system which is connected by a decoupler track to the compensation chamber.

The invention discloses an anti-vibration tool rest with adjustable cutter bar extended length for deep hole turning, belongs to the technical field of mechanical processing, and aims to solve the problems that in the prior art, cutter bar extended length cannot be automatically regulated, a cutting chattering phenomenon is severe, efficiency is affected by tool changing and tool setting errors are easily caused. The anti-vibration tool rest with adjustable cutter bar extended length for deep hole turning comprises a combined type blade, a cutter bar, a cutter bar supporting base and a power drive unit, wherein the blade is arranged at one end part of the cutter bar; the other end of the cutter bar penetrates through a cutter bar slot of the cutter bar supporting base; and the cutter bar realizes stretching out and drawing back by virtue of the power drive unit. According to the anti-vibration tool rest with adjustable cutter bar extended length for deep hole turning disclosed by the invention, the principle of restraining cutting chattering is mainly realized by regulating extended length of the cutter bar, and improving dynamic rigidity of the cutter bar under the same cutting condition. For a hole with greater depth, a mode of gradually increasing extended length distribution of the cutter bar to process to the final depth is adopted, so that the cutting chattering phenomenon generated when directly adopting cutter bar extended length bigger than or equal to hole depth can be avoided.

The invention provides a detection method for a cam outline detection system which has a simple structure and high detection precision and efficiency. The adopted cam outline detection system comprises a numerically controlled rotary table, a screw rod and nut pair, a laser measurement head, a grating bar displacement sensor, an encoder and an industrial control computer; the numerically controlled rotary table is used for driving a cam to horizontally and coaxially rotate around a vertical mandrel; the screw rod and nut pair is horizontally arranged on one side of the numerically controlled rotary table; the laser measurement head is arranged on a movable nut of the screw rod and nut pair and positioned on one side of the cam; the grating bar displacement sensor is used for measuring the horizontal displacement value of the movable nut; the encoder is used for detecting a rotary angle of the cam; and the industrial control computer controls the operation of the numerically controlled rotary table and the screw rod and nut pair, and obtains data of the outer outline of the cam according to data measured by the laser measurement head, the grating bar displacement sensor and the encoder.

A method for increasing the stability of a high-temperature superconductor magnetic suspension system comprises the following: (A) a step of field cooling, during which, a suspension body of the high-temperature superconductor magnetic suspension system is supported at a preset position through a support system, and then refrigeration equipment is started to ensure that a superconducting block enters superconducting state; (B) a step of support release, during which, the support system releases the support on the suspension body so as to ensure that the suspension body is in an idling stable state; (C) a step of loading, during which, external force is applied on the suspension body so as to ensure that the suspension body is in a stable suspension state under external force loading; and (D) a step of loading and the external force release, during which, the suspension body is in the stable suspension state again, and the state is taken as an initial state for the operation of the high-temperature superconductor magnetic suspension system. The method does not need to change the construction of the high-temperature superconductor magnetic suspension system, and ensures simple structure and operation and cost reduction; moreover, the method can obviously improve the stability of the high-temperature superconductor magnetic suspension system, and is suitable for any high-temperature superconductor magnetic suspension systems based on the high-temperature superconducting block type magnetic suspension principle.

An engine mount may include: a support device; a bracket device; and a vibration proof device which connects the support device and the bracket device, and, in which the vibration proof device may include a nozzle device fastened to the support device, and has a nozzle plate dividing an internal space of the vibration proof device into a first liquid chamber and a second liquid chamber, and a flow path penetrating the nozzle plate; a first insulator defining the first liquid chamber together with the nozzle plate; a first core protruding from the first insulator toward one side, and fastened to the bracket device; a second insulator defining the second liquid chamber together with the nozzle plate; and a second core protruding from the second insulator and fastened to the bracket device.

A tunable or tuned boring bar having increased stiffness is provided. Increasing the stiffness of the bar increases the natural frequency, thereby reducing directional deformation of the bar during use. The tunable boring bar includes a distal portion configured to support a tool, a proximal portion configured for attachment to a support structure of a metalworking machine, and a body, which is at least partially tubular, extending between the proximal portion and the distal portion. The tubular portion of the body has an elongated cylindrical cavity. The body of the boring bar includes a core layer formed from a first material and a coating layer formed from a second material. The second material has a higher modulus of elasticity than the first material. In certain configurations, the coating layer is bonded to the core layer by cladding, welding, chemical adhesives, chemical vapor deposition, pulsated plasma diffusion, or combinations thereof.

Tool bars that are manufactured as a composite, that is, layered devices. The tool bars can have a solid core, covered with a wrapped composite material, and then optionally covered with a metal sleeve. The tool bars are provided with high strength, improved stiffness over prior art tool bars, high density, low coefficient of thermal expansion, high damping capacity, improved rigidity, improved damping, less chatter and vibration, improved work piece tolerance, improved surface finish, increased speed/fee rates, and low production cost.

The invention provides a cam profile detection system based on a direct driving motor, and the system is simple in structure and high in detection precision and efficiency. The system comprises the direct driving motor, a mandrel, a feed screw nut pair, a laser measurement head, a grating ruler displacement sensor, a circular grating and an industrial personal computer, wherein the mandrel is coaxially fixedly arranged on the rotor of the direct driving motor and is used for driving a cam to coaxially rotate synchronously; the feed screw nut pair is horizontally arranged at one side of the cam; the laser measurement head is arranged on the movable nut of the feed screw nut pair; the grating ruler displacement sensor is used for measuring the horizontal displacement amount of the movable nut; the circular grating is arranged in the fixed seat of the direct driving motor and is used for detecting the rotation angle of the rotor; and the industrial personal computer is used for controlling the actions of the direct driving motor and the feed screw nut pair, and obtaining outer profile data of the cam according to data obtained by the laser measurement head, the grating ruler displacement sensor and the circular grating.

The invention discloses an electromagnetic suspension ball system with an acceleration detection function, and a control method thereof. In the system, an eddy current gap sensor collects a suspensiongap signal value and sends the same to a suspension controller; an acceleration sensor and a wireless transmitting unit are arranged in a steel ball, the acceleration sensor collects an accelerationvalue of the steel ball and sends the same to a suspension controller through the wireless transmitting unit and a wireless receiving unit; a current sensor detects a current signal of an electromagnet and sends the same to the suspension controller; and the suspension controller determines the magnitude of the current to be output according to the received suspension gap signal value, the acceleration data and real-time of the current signal, and then adjusts the winding current of the electromagnet through a chopper to change the magnitude of an electromagnetic force, so that the steel ballis suspended at a given suspension gap. The electromagnetic suspension ball system disclosed by the invention improves the suspension performance of the suspension system, increases the dynamic stiffness of the system, changes the damping and the vibration frequency of the system, and improves the anti-interference ability and the suspension stability of the system.

An antivibration support disposed for supporting and dampening loads between external elements, comprising a first and a second rigid member for securing to the external elements, and an elastomer body, connecting respectively the first and second rigid members.

The support also comprises a second body, having dissimilar material properties from the elastomer body, acting in parallel with the elastomer body to support and dampen the loads.

The invention discloses a position based impedance control method and system for a hydraulic driving unit. The method comprises that dynamic rigidity composition information of traditional position based impedance control is obtained; the composition information is analyzed to obtain inner-ring rigidity composition of position control; a dynamic submissive composite controller is designed according to the rigidity composition; according to information of the dynamic submissive composite controller, an inner-ring feedforward compensation controller is designed; a composite control strategy of the dynamic submissive composite controller and the inner-ring feedforward compensation controller are obtained; and the position based impedance is controlled according to the composite control strategy. The method and system of the invention can be used to improve the position based impedance control precision substantially.

The invention provides a cam profile detection system based on a direct driving motor, and the cam profile detection system is simple in structure and high in detection precision and efficiency. The system comprises the direct driving motor, a mandrel, a feed screw nut pair, a laser measurement head, a grating ruler displacement sensor, a circular grating and an industrial personal computer, wherein the mandrel is coaxially and fixedly arranged on the rotor of the direct driving motor and is used for driving a cam to coaxially rotate synchronously; the feed screw nut pair is horizontally arranged at one side of the cam; the laser measurement head is arranged on the movable nut of the feed screw nut pair; the grating ruler displacement sensor is used for measuring the horizontal displacement amount of the movable nut; the circular grating is arranged in the fixed seat of the direct driving motor and is used for detecting the rotation angle of the rotor; and the industrial personal computer controls actions of the direct driving motor and the feed screw nut pair, and obtains outer profile data of the cam according to data obtained by the laser measurement head, the grating ruler displacement sensor and the circular grating.

The invention relates to a double-stator axial magnetic flow arc-shaped permanent magnet motor, and belongs to the technical field of limited angle permanent magnet motors. A rotor is composed of an arc-shaped rotor iron core and permanent magnets, wherein the permanent magnets are installed on the left side and the right side of the arc-shaped rotor iron core. A double-stator assembly is composed of a left-side arc-shaped stator located at the left side of the arc-shaped rotor and a right-side stator located on the right side of the rotor. The left-side arc-shaped stator, the arc-shaped rotor iron core and the permanent magnet on the left side form a left-side axial magnetic flow arc-shaped permanent magnet motor body, the right-side arc-shaped stator, the arc-shaped rotor iron core and the permanent magnet on the right side form a right-side axial magnetic flow arc-shaped permanent magnet motor body, the torque of the two arc-shaped permanent magnet motor bodies is overlaid to serve as the output torque of the whole motor, the power density and the torque density of the motor are improved, the direct drive mode is adopted for a scanning structure, and the problems that the indirect drive mode formed by a high-speed servo motor, a gear set, a gear ring and the like in an existing scanning mechanism causes system vibration, slow motion response, poor dynamic stiffness and the like are solved.

The invention discloses a compound control method and system for a hydraulic drive unit position control system. The method comprises the steps that feedforward compensation control is adopted for forming a stiffness model opposite to first inherent dynamic stiffness in the system for compensating the influence of external load force on the inherent dynamic stiffness from the load force application point to the system output end. Further, self-adaptive feedforward compensation control is added for further compensating the deviation of input voltage and output voltage, and thus variations in system load pressure are compensated. In addition, through self-adjusting position control, the robustness of the two feedforward compensation control modes is improved. Finally, the three compensationcontrol modes are integrated, and the position compound control method is formed, so that the system dynamic stiffness tends to infinite. The dynamic stiffness of the position control system is improved, and the precision and robustness of outer loop compliant control are improved. Besides, the algorithm of the method is simpler and easier to implement in engineering.

Apparatus, including a vertical double-suction pump, is provided featuring a pump casing and a double suction impeller arranged therein on a shaft. The pump casing has a pump casing wall. The double suction impeller has upper and lower shrouds with metal rims configured to form upper and lower isolating annuli between the double suction impeller and the wall of the pump casing in order to impede a recirculation flow from an impeller discharge to be able to act of the upper and lower shrouds and create a controlled axial thrust load from differentiated hydraulic pressure on the upper and lower shrouds. The upper and lower isolating annuli may also be geometrically varied between the upper and lower shrouds of the double suction impeller to create a pressure differential in a direction parallel to an axis of rotation of the double suction impeller.

The invention provides a high-precision constant-transmission-ratio transmission mechanism based on ball screws, and belongs to the field of precision transmission. The mechanism is used for achieving constant-transmission-ratio transmission of parallel shafts (including coaxial shafts). Nuts of the ball screws of the two parallel shafts are connected, leads, precision grades and turning directions of the two ball screws are selected, and accordingly constant-transmission-ratio high-precision transmission in different turning directions is achieved. The mechanism has high transmission precision, high dynamic rigidity and long-term position stability, and is free of backlash, suitable for being use in a space in an optical instrument where the constant-transmission-ratio transmission is needed and meanwhile suitable for the precise transmission field with the same requirement.