14 results about "Viscous resistance" patented technology

This invention belongs to the field of vibration control technology and discloses a viscous damper for controlling vertical vibration. The viscous damper adopts a double-cylinder, unsealed structure. The two cylinders are connected by a connecting rod hole in the middle of the cylinder partition. One end of the connecting rod is rigidly connected to a piston inside the second cylinder, and the other end passes through the cylinder partition and the top plate of the first cylinder before connecting to a structure. The bottom of the second cylinder is connected to another structure. When the two structures generate a vertical relative velocity, the connecting rod drives the piston to move in the damping fluid of the second cylinder, generating viscous resistance and suppressing the relative motion of the two structures. This invention does not require strict sealing, has a simple structure, low manufacturing cost, and better durability. The damping coefficient can be dynamically adjusted as needed by the comb teeth or the gradually changing inner cavity of the cylinder, resulting in higher efficiency compared to traditional dampers. This invention can effectively control the vertical or slightly inclined relative motion between various large structures such as bridges, cables, building internal structures, and marine engineering projects caused by various dynamic loads.

The application provides a turbine flowmeter, which comprises a main body, a rotating shaft, a first turbine and a second turbine; an accommodating cavity is formed in the main body; the rotating shaft is located in the accommodating cavity and rotationally connected with the main body; the first turbine and the second turbine are arranged on the rotating shaft respectively, and a preset distance is provided between the first turbine and the second turbine; when fluid flows in the accommodating cavity and sequentially flows through the first turbine and the second turbine, the rotating direction of the first turbine and the rotating direction of the second turbine are the same. The application has the technical effect that the design is reasonable, the viscous resistance loss of the fluid is effectively reduced, and the measurement accuracy is improved.

The present application relates to the technical field of marine equipment modeling simulation, and provides an anchor chain parameterized modeling method and system based on multi-body-fluid joint simulation, which comprises: equivalent actual anchor chain to a plurality of anchor chain balls; by means of constant speed towing hydrodynamic simulation, the viscous resistance of the actual anchor chain section is calculated; the same equivalent anchor chain section is simulated under the same towing working condition, and the viscous resistance of the equivalent anchor chain section is calculated; the anchor chain ball radius is corrected through consistency verification; the density of the anchor chain ball is calculated based on the number and radius of the anchor chain ball; the anchoring water depth, mooring radius and seabed lying anchor chain section length of the actual anchor chain are obtained, and the initial position of each anchor chain ball is determined in combination with the anchor chain ball spacing; the model of the seabed and its irregular structures is created, and multi-body-fluid dynamics joint simulation under the action of gravity is carried out in combination with the radius, density and initial position of each anchor chain ball. The problems of low parameterization degree and poor adaptability of the mooring anchor chain lumped mass modeling method are solved.

This invention provides a scroll compressor having a cross-slip ring (17) that prevents the rotation of a rotating scroll member. The cross-slip ring (17) has an upper annular connecting passage (17d) on the axial upper surface of the annular portion (17a) that connects the inner and outer circumferences of the annular portion (17a). As a result, the contact area between the cross-slip ring (17), the bearing component in contact with the cross-slip ring (17), or the rotating scroll member is reduced, thereby reducing sliding losses. Furthermore, since the flowability of the refrigeration oil present around the cross-slip ring (17) is improved, reducing viscous resistance, a high-efficiency scroll compressor can be achieved.

The application provides a method and device for calculating the performance of a sand control device, the method comprising: step 1: obtaining pressure measurement data ΔP1 at different speeds V through a vortex tube panel model test; step 2: obtaining coefficients a and b according to the V and ΔP1 by using a formula; step 3: calculating viscous drag coefficients and inertial drag coefficients C by using a formula and a corresponding relationship about V; step 4: inputting the viscous drag coefficients and the inertial drag coefficients C into a calculation model of the vortex tube panel and performing simulation to obtain pressure simulation data ΔP2, and fine-tuning the viscous drag coefficients and the inertial drag coefficients C according to the pressure simulation data ΔP2 so that the pressure measurement data ΔP in the calculation model is close to the actual pressure loss of the vortex tube panel; and step 5: inputting the viscous drag coefficients and the inertial drag coefficients C into a calculation model of the sand control device to perform simulation calculation and obtain performance data of the sand control device.

This invention provides a method and system for generating a prohibited area-type three-dimensional virtual clamp for surgical safety assurance, relating to the field of virtual clamp technology. In this invention, selected key points are initially tracked through three-dimensional affine transformation; and precise dynamic positioning and tracking of three-dimensional key points in the in vivo environment are achieved by combining texture and optical flow information; furthermore, the three-dimensional coordinates of each key point are aggregated to obtain a three-dimensional prohibited area, and a virtual force field containing repulsive force and viscous resistance is established on the three-dimensional prohibited area, i.e., a prohibited area-type virtual clamp. This prohibited area-type virtual clamp precisely constrains surgical instruments into the protected tissue through a force feedback mechanism.

The present application belongs to the technical field of mechanical equipment manufacturing, and particularly relates to a grease stirring resistance and viscous resistance measuring device and method. The stirring resistance and viscous resistance measuring device is designed according to the geometric configuration relationship between the rolling body and the rolling track, and can represent, calculate and evaluate the stirring resistance and viscous resistance of the rolling bearing grease. The gravitational potential energy is converted into kinetic energy and then into internal energy received by the rolling body during operation. The stirring resistance and viscous resistance of the grease under different motion conditions are calculated by using the energy conversion method. The reliability is verified through measurement tests, and the measurement results can be further used as a technical standard for judging the physicochemical properties of the grease, and have good application prospect. The device structure is simple and effective, the measurement means and method are standardized, and can provide a basis for estimating the stirring resistance and viscous resistance of the grease.

The application provides a kind of clutch gear based on rolling body locking and electromagnetic control, belongs to mechanical transmission technical field.The clutch gear includes: clutch shaft, input gear coaxially installed on clutch shaft, output gear that is axially sleeved on the both ends of input gear on clutch shaft and control ring;Transmission ball is movably received in the axial guide hole of input gear, can produce axial displacement under the action of control ring, to realize the power connection or separation between input gear and output gear;Control ring has shear boss inserted into magnetorheological fluid, can rotate relative to input gear by a set angle under the action of shear viscous resistance generated by magnetorheological fluid or the action of tangential spring restoring force between control ring and output gear, to push transmission ball to produce axial displacement.

The application adopts a stretching molecular dynamics (SMD) calculation method, deeply discusses the difference of coalescence ability of different surfactant concentrations in the water-in-oil microemulsion droplets in the bulk space, analyzes the influence of oil droplet-water viscous resistance on the oil droplet coalescence ability, proposes a new analysis method, obtains the difference of work done by spring force in the coalescence process by comprehensively analyzing the coalescence behavior in water, quantitatively evaluates the coalescence difficulty, establishes a quantitative evaluation standard of the water-in-oil microemulsion droplet coalescence ability, deeply studies the influence of different surfactant concentrations on the coalescence in the bulk space, and provides an important theoretical basis for the calculation of the bulk oil droplet coalescence ability. The research provides important guidance for the further development of the in-depth exploration and related application of the bulk space microemulsion, and has significant theoretical and practical significance.

The utility model relates to related technical field of data center especially relates to a data center cold source simulation control box, including control box main part, the surface one side of control box main part is provided with buffer mechanism, the surface one side of control box main part is provided with replacement mechanism. When the vibration of outside produces, vibration is transmitted to the buffer pad first, and the buffer pad absorbs part vibration energy, and then the remaining vibration energy is transmitted to the shock absorber and telescopic link through the base, at this moment, the shock absorber starts to work, and the elastic element in it deforms under the action of vibration, and part of the vibration mechanical energy is converted into elastic potential energy and stored, so as to slow down the transmission of vibration. At the same time, the damping material in the shock absorber generates friction and viscous resistance during the vibration process, so that the vibration energy is converted into heat energy and dissipated, and the amplitude and duration of vibration are inhibited. At this moment, the control box main part on the surface of the supporting plate is not affected by vibration, so as to reduce the influence of vibration on the internal elements of the control box main part.

This invention belongs to the field of demulsifier production technology, and specifically relates to a demulsifier production equipment and its preparation method. The equipment includes a reaction vessel and a jacket disposed on the outer wall of the reaction vessel. The side wall of the jacket is connected to an inlet pipe and an outlet pipe. The upper side wall of the reaction vessel is connected to multiple injection pipes, and the lower side wall is connected to a discharge pipe. When the viscosity of the demulsifier raw material is detected to be low, the variable blade assembly horizontally pushes the raw material through the surface stirring plate, causing the demulsifier raw material to flow rapidly within the reaction vessel, thereby quickly achieving a mixing effect. When the viscosity of the demulsifier raw material is detected to be high, the variable blade assembly deforms into a ribbon-type stirring paddle, which can propel the demulsifier along the axial and circumferential directions. The large axial thrust generated can overcome the viscous resistance of the high-viscosity demulsifier, causing the demulsifier to tumble up and down.

The utility model belongs to spring damping composite damping equipment field especially, it is a kind of oxygen air compressor spring damping composite damping base, it includes shock pad, the top of shock pad is fixedly installed with two guide metal blocks, the outside of two guide metal blocks is fixedly installed with friction damping pad;The top of shock pad is fixedly installed with polyurethane buffer block, the top of polyurethane buffer block is fixedly installed with damping plate.The utility model can convert into friction energy dissipation for transverse vibration, solve transverse vibration out of control problem, to prevent transverse vibration and lead to equipment deviation or component loosening, enhanced the security of equipment, simultaneously through the damping plate, piston rod, piston head and oil sleeve set, utilize viscous resistance and oil internal friction, specially strengthen the middle frequency vibration attenuation, effectively improved the vibration relief efficiency of equipment, improved practicality and stability.

This invention discloses a method for generating nanoscale droplets through impact printing based on microelectromechanical systems (MEMS), belonging to the field of MEMS technology. The method includes: constructing an actuator with a flexible membrane containing reinforcing ribs; applying a controlled voltage ramp to allow the membrane to slowly store energy and lock the pre-deformation displacement based on real-time capacitance values; rapidly cutting off the voltage to cause the membrane to rebound towards a microfluidic cavity with high acceleration under elastic restoring force, generating a high-energy shock wave; driving the fluid to overcome viscous resistance and eject to form droplets; and capturing residual vibration data to dynamically adjust the voltage to achieve closed-loop feedback. This method can generate a steep pressure wave front, effectively shearing high-viscosity fluid bridges and eliminating satellite droplets, ensuring long-term consistency and precise resolution of droplet volume; and solving the problems of insufficient kinetic energy and poor consistency in the distribution of high-viscosity fluids.

The application discloses a method for generating a specific pattern by inducing particle adsorption based on micro-fluidic bubbles, and belongs to the fields of micro-fluidics and fluid mechanics.The method comprises the following steps: obtaining three-dimensional flow field data containing spatial position, corresponding velocity and phase field information; performing numerical simulation on particle motion based on the three-dimensional flow field data, calculating gravity, buoyancy, viscous resistance, van der Waals attraction, electrostatic repulsion, friction, wall support force and capillary force acting on the particle by judging the contact state of the particle with a wall surface and a gas-liquid interface; constructing a particle motion equation under the combined action of the above eight forces, updating the particle position and obtaining a migration track by using a time advancing method according to the motion equation; when the spherical surface of the particle is in contact with the solid wall surface, if the movement speed of the particle in the solid wall surface is consistent with the movement speed of the solid wall surface, it is determined that the particle has completed the transition from free motion to stable deposition, and the position of the particle at this time is recorded as a deposition site; and all the deposition sites are gathered into a specific pattern.