35 results about "Mechanical instability" patented technology

Microfluidic Systems, Devices and Methods for Reducing Noise Generated by Mechanical Instabilities. According to one embodiment, a microfluidic device is provided for reducing noise in a fluid mix. The microfluidic device can include microscale channels for passage of fluids to a mixing junction. The mixing channel can be adapted to combine the fluids into a common fluid flow. The microfluidic device can also include a connector channel including first and second ends. The first end of the connector channel can be connected to the mixing junction. The microfluidic device can also include an expansion channel having connection to the second end of the connector channel. The expansion channel can be adapted for passage of the fluid mix through the expansion channel to reduce concentration gradient noise of the fluid mix by dispersion of the fluid mix as the fluid mix passes through the expansion channel.

The invention provides a common-path self-calibration film thickness measuring device and a measuring method based on polarization multiplexing. The measuring device includes a light source output module, a film thickness measuring probe module, a demodulation interferometer module, a polarization beam splitter module, and an acquisition and control module. The polarization multiplexing technology is used in the invention, and two probes use orthogonal polarized light. The measuring probes can transmit and reflect transferred light. When there is no film to be measured, the absolute distance H between the two probes can be measured. When a film to be measured is placed between the two probes, the absolute distances H1 and H2 between the two probes and the front and back surfaces of the film to be measured can be measured. The thickness d of the film to be measured is determined according to the formula d=H-(H1+H2). The thickness of a film to be measured can be measured without a calibration object. Through a common-path design, the influence of the mechanical instability inside the system and the change in external environment on the measurement process is overcome. The measuring device and the measuring method have the advantages of self-calibration, simple feature white light interference peak identification, large dynamic range, traceable measurement result, and the like.

A retractable proximity sensor system with a self-compensating mechanism to reduce the impact of mechanical instability on the precision of a proximity sensor is disclosed. The retractable proximity sensor system includes a retractable proximity sensor and a proximity sensor housing in which the housing includes a reference plate that is either integral or affixed to the housing. The proximity sensor precisely detects very small distances between a measurement probe and a work surface, such as, for example, a semiconductor wafer. A method is provided for extending and retracting a proximity sensor and compensating for the drift associated with the mechanical instability of a proximity sensor head to improve precision.

The present invention provides a common-optical path self-calibrating thin film thickness measuring device and measuring method. The measuring device includes a light source output module, a film thickness measurement probe module, an interference and demodulation module and an acquisition and control module; the measuring probes of the measuring device of the invention can simultaneously realize the transmission and reflection of transmitted light, the measurement of an absolute distance H between the two probes can be realized when no thin films to be measured exist; when a thin film to be measured is arranged between the two probes; an absolute distance H1 between one probe and the front surface of the thin film to be measured and an absolute distance H2 between the other probe and the rear surface of the thin film to be measured can be realized; and the thickness of the thin film to be measured can be determined according to an equation that d=H-(H1+H2). With the common-optical path self-calibrating thin film thickness measuring device and measuring method of the invention adopted, the measurement of the thickness of a transparent thin film and an opaque thin film can be realized without calibrating samples required; and since interference light beams share one optical path, influences brought by mechanical instability in a measurement system and the change of an external environment during a measurement process can be eliminated. The common-optical path self-calibrating thin film thickness measuring device and measuring method have the advantages of self-calibration, traceable measuring results, high stability and the like.

The invention relates to a sprayer, and particularly discloses a boom sprayer. The boom sprayer comprises a pesticide box, a pesticide spray tube, an elevating mechanism, a locking mechanism and spray rods, wherein the back face of the pesticide box is provided with a guide rail; the spray rods can move up and down on the guide rail, and comprise a fixed spray rod and four foldable spray rods extending outwards from the two ends of the fixed spray rod in a hinging manner; a folding mechanism is arranged between every two adjacent foldable spray rods; a protective mechanism is further arranged between the foldable spray rods at the outermost ends. The boom sprayer is large in application area, high in working efficiency and high in safety coefficient. Meanwhile, the spray rods are foldable, so that the turning radius and storage space are reduced, and high running flexibility is achieved. Moreover, a planar truss is taken as each foldable spray rod, so that high stability is achieved, and the mechanical safety is enhanced. Through the protective mechanism, the spray rods can bend naturally when barriers are met, so that the mechanical instability is reduced, and damages to the barriers can be relieved.

The invention relates to a spray boom, in particular to a spray boom for a boom sprayer. The spray boom for the boom sprayer comprises a fixed spray boom body and four folding spray boom bodies extending outwards from each of the two ends of the fixed spray boom body in a hinged mode, a folding mechanism is arranged between every two adjacent folding spray boom bodies, a protecting mechanism is further arranged between each endmost folding spray boom body and the corresponding tail end folding spray boom body, and a protecting rod inclined downwards is arranged on each endmost folding spray boom body. The spray boom for the boom sprayer can be folded, the turning radius and the placing space are decreased, a planar truss is adopted as the folding spray boom, the spray boom for the boom sprayer has very good stability, and mechanical safety is improved; the spray loom naturally bends when coming across a barrier due to the arranged protecting mechanisms, mechanical instability is reduced, and damage to the barrier can also be reduced.

The invention discloses a tipping-prevention system and method for a crawler-type traveling machine. Supporting wheels are arranged on a track traveling rack of the crawler-type traveling machine; the tipping-prevention system for the crawler-type traveling machine includes pressure sensors arranged on the supporting wheels to detect pressure borne by the supporting wheels, and a controller electrically connected with the pressure sensors, receiving pressure information detected by the pressure sensors, judging the stability of the crawler-type traveling machine as per the pressure information, and performing corresponding tipping-prevention treatment when the crawler-type traveling machine is unstable. The tipping-prevention system for the crawler-type traveling machine, provided by the invention, can be used for detecting pressure information of all the supporting wheels and detecting the track traveling rack at a plurality of positions, judging the stability of the traveling machine, and effectively reduces misjudgment as the judging result is more visualized and accurate.

A rotary transformer for coupling electrical power at a high level into a rotor operable at a high rotational speed without the introduction of undesirable electromagnetic torque and problems of dynamic mechanical instability comprises a stationary primary mounted in surrounding relationship with respect to the rotor, an electromagnetic shield having an exterior surface thereon mounted to the rotor, and a secondary mounted on the exterior surface of the shield. The secondary is connected in an electrical circuit with the load such that the application of an alternating current having a frequency of at least one (1) kilohertz to the primary produces an alternating electromagnetic field having flux lines in the secondary in the secondary oriented generally parallel to the axis of rotation. The alternation of the electromagnetic field induces a voltage in the secondary that generates an electric current to the load. The shield isolates the rotor from the alternating electromagnetic field to prevent eddy current heating of the rotor.

The invention discloses a geostress evaluation method based on mechanical instability collapse of a well wall. The method comprises the following steps: screening mechanical instability collapsed well sections and classifying data; representing deep ground stress and borehole wall stress based on a tectonic strain coefficient; establishing a tectonic strain coefficient equation based on a stress limit equilibrium condition; solving the tectonic strain coefficient based on a least square method and calculating horizontal principal stress; In the present invention, the well wall stress instability collapsed well section data and collapsed data classification are screened, the stress limit equilibrium equation is created based on the strain factor and solve the overdetermined equation based on the information constraints of the critically collapsed formation, the maximum principal stress and minimum principal stress of the in-situ level of the evaluation deep part are calculated. an in-situ stress result rationality evaluation method is given, quantitative calculation and evaluation of the horizontal principal stress of the deep stratum are realized, and necessary deep stratum mechanics basic parameters are provided for underground deep engineering, especially oil and gas well engineering, oil and gas exploitation engineering and the like.

The invention discloses a wind-cold-dampness arthralgia type knee osteoarthritis model building method.The method comprises the following steps that 1, knee joint anterior cruciate ligaments of a rat are cut off, and joint instability is caused; 2, two weeks later, the rat treated in the first step is put into ice water for activity for one hour every day, the whole process is continuously conducted for four weeks, and a wind-cold-dampness arthralgia type knee osteoarthritis model is obtained.The invention further discloses a device used for establishing the model and a use method.According to the method and the device, operation is easy, the effect is definite, repeatability is high, the theory of modern medicine to osteoarthritis pathogenesis is combined with the traditional medicine heumatism etiological theory, and on the basis of mechanical instability of the knee joints of the rat, cold stimulation is added to serve as an additional factor for induction, and therefore the wind-cold-dampness arthralgia type knee osteoarthritis model based on the mechanical instability is built.

A method for fabricating MEAs employing such gas diffusion layers and or gas diffusion electrodes that address the problems attendant to conventional methods. Due to the mechanically unstable nature of the electrolyte membrane material, it is advantageous to attach or bond the electrolyte membrane material to a supportive substrate before being sized for incorporation into a fuel cell. The GDL or GDE is used as the supportive substrate for the electrolyte membrane material.

The invention relates to a novel taper-free pumped optical fiber combiner structure. The pumped optical fiber combiner is formed by combining at least one pumped fiber, a beam combining and coupling device, a device used for packaging and fixing the combiner and a device used for outputting. The beam combining and coupling device is prepared by a quartz material with a special shape, and comprisestwo parts, namely a convex mirror and a conical cylinder, wherein a high-reflectivity thin film for the pumping wavelength is plated on the side face of the conical cylinder, and the beam combining efficiency can be guaranteed. By the adoption of the pumped optical fiber combiner structure prepared by the novel structure, the mechanical instability caused by the optical fiber taper under a conventional pumped beam combining method can be effectively avoided, the structure can be used for pumped beam combination of a high-power fiber laser, the pumping brightness is improved, and the structurehas relatively high manufacturability and is convenient to popularize.

The inventions (variants) are intended for improvement of calibration precision of digital X-ray apparatuses: computed tomographs, as well as digital X-ray apparatuses equipped with C-arm and U-arm type stands, which method is based on calculation of mechanical instability of the stand. Calibration method for X-ray apparatus, in which one or two X-ray contrast balls of different diameters are placed in the scanning field, excluding its centre, a series of images of the scanning field with different angles of the stand rotation are obtained, the X-direction and Y-direction regular components of mechanical instability of the X-ray apparatus stand are determined using the coordinates of projection centre of the ball, X-direction and Y-direction calibration modifications set for mechanical instability of the stand are formed, which modifications are used for correction of the images, according to the invention the additional regular component of mechanical instability of digital X-ray stand is determined using the scales of projections, and the calibration data set for mechanical instability of the stand, which includes the scale calibration modifications, is formed.

The invention relates to the field of material surface magnetism measurement, and discloses an in-situ measurement method for sample magnetism. The in-situ measurement method adopts a measuring device, wherein the measuring device comprises a light source, an aspherical mirror I, an aspherical mirror II, a field diaphragm, a polarizer, an aspherical mirror III, a translucent reflector, an objective lens, a laser device, a sample, a sample platform, a substrate, a stepping motor, an inclined plane bench, an ejection pin, a magnet, slit diaphragms, a photoelectric detector I, a compensator, ananalyzer, an aspherical mirror IV and a photoelectric detector II. According to the in-situ measurement method, the illumination region on the sample does not need to be changed by means of the diaphragm slits, the Kerr sensitivity in different directions is measured, the mechanical instability in the experiment is reduced, incident light intensity in different directions are adjusted through adjusting the number and the duration of turned-on LED lamps, the intensity of incident light is adjusted in real time according to the acquired image quality so as to obtain an image with good resolution, and especially for some magnetic samples with complicated magnetization directions of magnetic domains, the magnetoelastic property of the sample can be studied in situ through adopting the method of applying stress to the back surface of the sample.

The invention discloses a soil body collapse numerical simulation method based on a mechanical balance principle, and relates to the technical field of soil body collapse simulation and computer numerical calculation. The method comprises: generalizing the shape of a collapsed soil body; determining that the cross section of the collapsed soil body comprises a trapezoid; selecting a pre-collapsedsoil body, a right triangle and a rectangle, acquiring geometric parameters of the pre-collapsed soil body, simulating stress of the pre-collapsed soil body with different section shapes according tothe geometric parameters, judging whether the soil body is collapsed or not according to a simulation result, and acquiring the quality of the soil body if the soil body is collapsed, thereby realizing numerical simulation of the collapsed gravity erosion soil body. Based on the most fundamental cause-mechanical instability mechanism of the collapse, the method provides a judgment condition for judging whether the collapse occurs or not, and simulates the collapse amount. The method is not limited by geographical and topographic factors and can be widely popularized and applied.

The invention discloses a micro-mechanical instability acceleration sensor, and belongs to the technical field of rail transit. The micro-mechanical instability acceleration sensor is composed of a biaxial accelerometer, a power conversion circuit, an acquisition processing circuit and a current output circuit. When the system is used in a train instability monitoring system, the accuracy of train transverse and longitudinal acceleration measurement can be effectively improved, and meanwhile the system has the advantages of being high in real-time performance, simple in circuit structure, small in size, flexible to install, high in cost performance, low in power consumption, high in anti-jamming capability and the like.

The invention relates to a spray boom, in particular to a spray boom for a boom sprayer. The spray boom for the boom sprayer comprises a fixed spray boom body and four folding spray boom bodies extending outwards from each of the two ends of the fixed spray boom body in a hinged mode, a folding mechanism is arranged between every two adjacent folding spray boom bodies, a protecting mechanism is further arranged between each endmost folding spray boom body and the corresponding tail end folding spray boom body, and a protecting rod inclined downwards is arranged on each endmost folding spray boom body. The spray boom for the boom sprayer can be folded, the turning radius and the placing space are decreased, a planar truss is adopted as the folding spray boom, the spray boom for the boom sprayer has very good stability, and mechanical safety is improved; the spray loom naturally bends when coming across a barrier due to the arranged protecting mechanisms, mechanical instability is reduced, and damage to the barrier can also be reduced.

The invention discloses a soil body collapse numerical simulation method based on a mechanical balance principle, and relates to the technical field of soil body collapse simulation and computer numerical calculation. The method comprises: generalizing the shape of a collapsed soil body; determining that the cross section of the collapsed soil body comprises a trapezoid; selecting a pre-collapsedsoil body, a right triangle and a rectangle, acquiring geometric parameters of the pre-collapsed soil body, simulating stress of the pre-collapsed soil body with different section shapes according tothe geometric parameters, judging whether the soil body is collapsed or not according to a simulation result, and acquiring the quality of the soil body if the soil body is collapsed, thereby realizing numerical simulation of the collapsed gravity erosion soil body. Based on the most fundamental cause-mechanical instability mechanism of the collapse, the method provides a judgment condition for judging whether the collapse occurs or not, and simulates the collapse amount. The method is not limited by geographical and topographic factors and can be widely popularized and applied.

The invention discloses an axial pre-tightening mechanism for a transformer. The mechanism comprises an upper clamping piece, a pressure plate and a plurality of clamping points; each clamping point comprises a reinforced plate, a support plate and a cushion plate; the reinforced plate and the support plate are connected with the upper clamping piece; and the cushion block is arranged between the support plate and the pressure plate. With the adoption of the mechanism provided by the invention, the pressure plate of a transformer can be stressed uniformly; the mechanical strengths of various areas can be kept the same when the transformer is subjected to sudden short circuit, and no mechanical instability caused by certain weaken point exists.

The invention discloses a C type steel with reinforcement fins for a building steel structure. The reinforcement fins are connected at an opening of the C type steel. The reinforcement fins can be vertical, or inclined in one way or inclined in two ways. The invention mainly aims to overcome the disadvantages of center bias and mechanical instability of conventional C type steel products. The bearing capacity of the C type steel is effectively improved and the cost is reduced. Therefore, the C type steel can be widely applied to the field of building steel structures.

The invention relates to a method suitable for dynamic skin flow control of an object. According to the method, a deformable material is attached to the surface of the object, the material and the object can move relative to each other, the object is stretched and contracted by using the mechanical instability of the material, a material flattening surface and a 3D textured surface are transformed, and specifically, when flow separation exists on the surface of the object, the material is stretched, the texture surface with the vortex generator effect is generated, and the flow separation is inhibited; and when flow separation does not exist on the surface of the object, the material is contracted, the surface of the object returns to a smooth state, and the generation of additional resistance is prevented. Compared with the prior art, a passive flow control strategy is adopted by the method, so that the method is high in adaptability and can be used for flow devices such as a cylindrical turbulent flow and a wing; the dynamic flow control strategy is used, so that the expansibility is good; through different degrees of stretching, flow separation control of various variable working conditions can be realized; and a mature passive control strategy is adopted, so that the cost is low, and the reliability is high.