129 results about "Simple harmonic motion" patented technology

The invention relates to a dynamic object modulation transfer function measuring method and a device thereof, pertaining to the optical property measurement field. The invention aims at providing a dynamic object modulation transfer function measuring method and a device thereof which can carry out the dynamic object modulation transfer function measurement under different fields of view, namely, uniform linear motion, uniformly-accelerated rectilinear motion, simple harmonic motion, but also can measure static target modulation transfer function and separate the static target modulation transfer function from whole machine modulation transfer function. The device consists of a light source, a collimating lens, a pupil coupling system and an electro-optical imaging system which are arranged along the ray propagation direction in sequence; the electro-optical imaging system carries out imaging towards the light source moving along the guide rail direction and line spread function is obtained from the image and carried out one-dimensional Fourier transformation so as to obtain the dynamic object modulation transfer function. The method and the device of the invention are not only suitable for static image evaluation field but also for the image evaluation field of dynamic object imaging by a time-delay electro-optical imaging system.

The invention discloses a method for determining current rigidity and displacement rigidity of a permanent magnet biased hybrid magnetic bearing. The method comprises the following steps of: establishing relation among the current rigidity, the displacement rigidity, controller proportional gain and oscillation frequency of simple harmonic motion of a magnetic suspension rotor according to a kinetic equation of the simple harmonic motion of the magnetic suspension rotor; obtaining related data about the controller gain and the oscillation frequency of the simple harmonic motion of the magnetic suspension rotor by adjusting the controller proportional gain; and determining the current rigidity and the displacement rigidity of the magnetic suspension rotor by fitting the coefficient of a unitary linear regression equation. The method has the advantages of simplicity and practicability and can be applied to the analysis and design of a magnetic suspension rotor control system.

The invention concerns a tufting machine having at least one needlebar, loopers, hooks to pick up yarn delivered through the needles of the needlebar, knives to cut yarn loops and driving means, with the needle action and/or the looper action and/or the hook action, and/or the knife action being a non-simple harmonic motion. In said machine the needles, the hooks, the knives and the loopers have separate drive systems. So the motion of the needles, the hooks, the knives and the loopers can be such that first of all the pickup of the yarn or the cutting of the yarn loop can be improved. When the drive system is computer controlled more accurate machine set up can be achieved. Moreover different set ups can be achieved automatically for different products. Patterning effects are also possible.

The invention provides a decoupled three-degree-of-freedom forced vibration system for a bridge section model. The system comprises an outer vibration system, an inner vibration system, a model support system and a detection system, wherein the outer vibration system and the inner vibration system are symmetrically arranged on the two sides of a wind tunnel; the model support system is connected with the outer vibration system and the inner vibration system respectively, and is also connected with the detection system; the detection system is connected with the bridge section model through an inner model connecting plate and an outer model connecting plate; and the outer vibration system and the inner vibration system synchronously vibrate under the drive of a servo motor to realize the synchronous three-degree-of-freedom sinusoidal vibration of the bridge section model. By the system, the transverse motion, vertical motion and torsional motion of the model in a section are realized, and are combined into totally seven kinds of motion with higher amplitude, and each kind of motion is independent simple harmonic motion with adjustable frequency, amplitude and phase. The system has the advantages of capability of acquiring three components of force of the bridge section model in real time, and data accuracy.

The invention discloses a plunger-typed flow flutter generator, which comprises a rotary table provided with a positioning hole, a propeller shaft, a promoting linear guideway group, a guidance linear guideway group, a plunger, a cylinder, a sealing end cover, a motor, a speed reducer, a frequency converter and the like. The motor drives the rotary table to rotate; the propeller shaft which is fixed on the rotary table and the promoting linear guideway group convert a circular motion into a reciprocating linear simple harmonic motion of the plunger in the cylinder. A plunger cylinder is connected into a flow pipeline by a tee joint; a certain amount of main pipeline fluid is absorbed in or extruded out of the cylinder; and a sine flutter is superimposed on the main flow. The frequency converter changes the rotating speed of a stepping motor and can regulate the period of the flutter. The rotating radius of the propeller shaft which is fixed on the rotary table is regulated so as to change the stroke of the plunger; in addition, plunger suites with different diameters can be replaced; the combination of the two types can change the pumping capacity of the plunger cylinder, thus obtaining the flutter with different amplitudes. The plunger-typed flow flutter generator can generate standard sine flow output with different flutter amplitudes and continuously changing periods.

The invention relates to a fatigue testing device for lateral dynamic bending of a piston rod of a vibration damper, which is provided with a simple harmonic motion mechanism driven by a driving device to be used for providing simple harmonic excitation; a spring support is sleeved outside an output component of the simple harmonic motion mechanism; two pressure springs which are arranged from top to bottom are arranged in the spring support; the output component of the simple harmonic motion mechanism is clamped between the two pressure springs; the upper end of the spring support is connected with a force sensor; the upper end of the force sensor is connected with a universal connector; and the device is also provided with a fixing clamp and a data acquiring and processing system, wherein the signal output end of the force sensor is connected with the data acquiring and processing system. The invention has the advantage that bidirectional symmetric exciting force with the same maximum value can be applied to piston rods of various specifications to enable each piston rod to complete excitation for the set times under a certain excitation frequency, thus the fatigue strength of lateral dynamic bending of the piston rod of the vibration damper can be detected to ensure the product quality.

The invention discloses a method for measuring micro impulse by Doppler galvanometer sine-modulated multi-beam laser heterodyne second harmonic, relates to a method for measuring micro impulse and aims to solve the problems of low acquired laser difference frequency signal quality and low signal processing computing speed in the micro impulse measurement of conventional laser heterodyne methods. The method comprises the following steps of: exciting a working medium target to generate plasma jet to rotate a beam of a standard beam; starting a driving power supply of an H0 solid laser and a galvanometer, and causing the galvanometer to perform simple harmonic motion and modulate optical frequency incident to the front surface of the galvanometer at different moments under the action of the driving power supply; and continuously acquiring signals transmitted by an optoelectronic detector in the pendulum process of a torsional pendulum system, and processing all the continuously acquired signals to obtain the micro impulse to which the beam of the standard beam is subjected by using a signal processing system. The method has the prominent advantages of high acquired laser difference frequency signal quality and high signal processing computing speed.

The invention discloses a rolling forced vibration dynamic derivative test device for a high-speed flying wing model under a large attack angle. The rolling forced vibration dynamic derivative test device comprises a rigid support device, a motor driving device, a motion conversion device, a simple harmonic motion angle measurement device, a simple harmonic motion transmission device, a five-component dynamic load measurement device and a dynamic derivative test model; and the rigid supporting device supports the whole test mechanism, and the tail end is directly installed on a wind tunnel bent blade arm. The motor driving device is a power source, provides continuous rotary motion output for the whole set of test mechanism and is mounted at the tail part of the rigid supporting device; the motion conversion device converts the continuous rotating motion into required simple harmonic motion, and the angle time history of the simple harmonic motion is measured through the simple harmonic motion angle measuring device; the simple harmonic motion transmission device transmits motion to the five-component dynamic load measuring device, the dynamic derivative test model is installed onthe five-component dynamic load measuring device, and the dynamic derivative test model is subjected to dynamic load in the simple harmonic motion process of the five-component dynamic load measuringdevice; and signal processing is performed on the measured dynamic load time history and the simple harmonic motion angle time history so as to obtain a required dynamic derivative value.

The invention relates to a method for measuring a micro impulse, more particularly to for a second harmonic multi-beam laser heterodyne measurement method for a micro impulse based on doppler oscillating mirror sinusoidal modulation. The invention aims at solving a problem of poor qualities of collected laser difference frequency signals and slow operation speeds of signal processing during microimpulse measurement in the current laser heterodyne method. According to the method, a pulsed laser emits a pulse laser excitation working medium target that generates plasma injection, and the plasma injection enables a crossbeam of a standard beam to make rotations; driving powers of an H0 solid state laser and an oscillating mirror are started; the oscillating mirror, which is driven by the driving power, makes simple harmonic motions and carries out modulation on optical frequencies that are incident to the front surface of the oscillating mirror at different times; and a signal processing system collects continuously signals emitted by a photoelectric detector during a swing process of a torsion pendulum system and also carries out processing on all continuously obtained signals, so that a micro impulse I exerted on the crossbeam of the standard beam is obtained. According to the invention, the method has advantages of high qualities of collected laser difference frequency signals and a fast operation speed during signal processing.

The invention discloses an organic fertilizer mixing and mixedly conveying method adopting a sine wave mode to push. The method comprises the following steps that organic fertilizer is arranged at theconveying starting end of a conveying belt; a transmission motor is started, an output shaft of the transmission motor rotates to drive a transmission driving wheel to rotate and to drive a transmission driven wheel to rotate around the axis of the transmission driven wheel; the transmission driven wheel rotates to drive a connecting shaft on a main transmission assembly to rotate and to drive afirst transmission belt wheel and a second transmission belt wheel which are located on the main transmission assembly to rotate, so that a first transmission belt and a second transmission belt are driven to move, a transmission roller and an adsorption rod are driven to move along the movement directions of the first transmission belt and the second transmission belt, and the movement of the transmission roller enables a particle on the conveying belt to do an up-down simple harmonic motion.

The invention discloses a dynamic derivative test device for pitching yaw forced vibration of a high-speed flying wing model under a large attack angle. The dynamic derivative test device comprises amotor driving device, a rigid supporting device, a simple harmonic motion conversion device, a motion transmission device and a signal measurement device, the motor driving device is a torque output part of the whole dynamic derivative test device; and the rigid support device enables the whole test device to be installed in a wind tunnel, and supports the motor drive device, the simple harmonic motion conversion device and the signal measurement device. The simple harmonic motion conversion device converts the continuous rotating motion output by the motor driving device into simple harmonicmotion required by the test, and transmits the simple harmonic motion to the motion transmission device; the motion transmission device is directly connected to the middle part of the signal measurement device and drives the signal measurement device to do simple harmonic motion in a specified form; and the signal measuring device measures force, torque and angular displacement signals in the whole movement process.

The invention discloses a planetary crank driving mechanism, a flapping-wing mechanism utilizing the planetary crank driving mechanism and a flapping-wing aircraft utilizing the planetary crank driving mechanism. The planetary crank driving mechanism comprises a crank shaft, a first eccentric journal, a first eccentric block and a first planetary gear mechanism, wherein the crank shaft is driven to rotate by virtue of external power, and the rotation axis of the crank shaft is fixed; the first eccentric block is rotatably sleeved on the first eccentric journal; the eccentric distance of the first eccentric block is as the same as that of the first eccentric journal; the first planetary gear mechanism comprises an inner gear ring and a planetary gear meshed with the inner gear ring; the planetary gear and the first eccentric block are synchronously and rotatably connected; the central axis of the inner gear ring and the rotation axis of the crank shaft are coaxially arranged; the first eccentric block integrally performs linear harmonic motion when the crank shaft rotates. According to the planetary crank driving mechanism of the flapping-wing aircraft, when the crank shaft rotates, the first eccentric block integrally performs linear reciprocating harmonic motion, so that the high-frequency vibration of the flapping-wing aircraft can be reduced.

The invention provides a high-frequency fatigue testing device and a micro-topography observing device.The high-frequency fatigue testing device comprises two collets (11) and a driving system.The two collets (11) are arranged in a certain-distance mode; a test sample (10) can be fixed between the two collets (11); the driving system can drive the two collets (11) to perform simple harmonic motion in the connecting direction between the two collets (11), and comprises a motor (13).The high-frequency fatigue testing device is simple in structure, capable of testing samples with multiple sizes, high in adaptability, compact in space structure and convenient to observe.The high-frequency fatigue testing device can be further matched with a microscopy imaging instrument (such as a scanning electron microscope (SEM) and an optical microscope (OM)) to form the micro-topography observing device, and therefore a tested piece is subjected to an in-situ micro-nano fatigue mechanical performance test.

The invention discloses a sanding belt reciprocating and track correcting device of a wide belt sander. A driving wheel is pivoted and fixed on a stand; a bracket is arranged above the stand and is pivoted and fixed on the stand by a shaft lever; a driven wheel corresponding to the driving wheel is pivoted on the bracket; the bracket is driven by a correcting configuration to swing by taking the shaft lever as a fulcrum; the correcting configuration is provided with two rolling assemblies at an interval on the bracket, and the central axes of the two rolling assemblies are parallel mutually so that a fixed distance is formed between the two rolling assemblies; the stand is provided with a cam wheel between the two rolling assemblies, and the central axis of the cam wheel is parallel to the central axes of the two rolling assemblies, so that the cam wheel can toggle the two rolling assemblies at time intervals by utilizing the offset of the cam wheel when rotating around the central axis of the cam wheel; and the bracket can make simple harmonic motion by taking the shaft lever as the fulcrum, so that the single-side abrasion machining situations of sanding belts wound at the peripheries of the driving wheel and the driven wheel can be reduced.

The invention belongs to the field of teaching instruments and concretely relates to a novel standing wave demonstrating instrument, which aims to provide the novel standing wave demonstrating instrument which not only can be used for demonstrating transverse standing waves, but also can be used for demonstrating vertical standing waves, can also be used for demonstrating the relation of circular motion and simple harmonic motion and can be used for adjusting the frequency of the standing waves. The invention provides the following technical scheme that: the novel standing-wave demonstrating instrument is provided with a frame, wherein a direct-current motor is fixed on the frame, a disk is installed on an output shaft of the direct-current motor, a short shaft is arranged on the disk, a T-shaped clamping sleeve is hung on the short shaft, the T-shaped clamping sleeve can upwards and downwards move under the restriction of a guiding sleeve, the lower end of the T-shaped clamping sleeve is provided with a small hole, one end of a vibrating body for forming the standing waves is fixed on the small hole, and a heavy object is hung at the other end of the vibrating body. Compared with a standing wave demonstrating teaching aid used at present, the novel standing wave demonstrating instrument has the advantages of multiple functions, small size, low manufacturing cost, safety, reliability, convenience in carrying and the like.

The invention discloses a single epoch GNSS solving method with horizontal restraining. A key problem of dynamic single epoch positioning is a correct solution of ambiguities. By increasing constraintconditions, the reliability of the single epoch solution ambiguities can be improved. The monitoring point GNSS coordinate sequence of observation data of 15-30 min is used, a wavelet analysis methodis used for determining a simple harmonic motion equation of a super high-rise building under the external force loading action, and the constraint conditions are constructed according to the motionlaw of the super high-rise building. In order to solve the problem of the rank defect of single epoch solving, a pseudorange observation value is introduced, as the combined wavelength of a wide laneis longer, and the ambiguity is easier to determine. Therefore, through the constraint conditions additionally having the super high-rise building motion state, the ambiguity of the wide lane is firstly fixed, then state restraining is added to determine the L1 and L2 ambiguities, and quick solving of the ambiguities is achieved.

The invention discloses a five-mass-block biaxial detection silicon micro resonant gyroscope based on out-of-plane vibration. The gyroscope comprises a first mass block, a polar plate substrate, a transmission beam, two mass blocks which are located at symmetrical positions and sensitive to Y-axis angular velocity, two mass blocks which are located at symmetrical positions and sensitive to X-axis angular velocity, detection comb teeth, anchor points, lever supporting beams and a frame. The first mass block and the polar plate substrate form a capacitor structure, so that the first mass block generates simple harmonic vibration in the Z-axis direction, and the simple harmonic vibration is transmitted to the other four mass blocks through the supporting beams between the first mass block and the other four mass blocks. The the other four mass blocks are enabled to achieve simple harmonic motion in the Z-axis direction the same as that of the first mass block, when angular velocity in the X-axis direction or the Y-axis direction occurs, Coriolis force is generated on the four mass blocks, and angular velocity detection in the X-axis direction and the Y-axis direction is achieved through the comb tooth detection structure. According to the invention, real-time, high-precision and high-sensitivity measurement of the out-of-plane vibration five-mass-block double-axis angular velocity is realized.

The invention discloses a three-degree-of-freedom wave energy float power generation device and power generation method. According to the three-degree-of-freedom wave energy float power generation device, three power generation units are arranged corresponding to heaving, surging and rolling degrees of freedom, reciprocating wave energy on the degrees of freedom can be captured and is converted into unidirectional output of a generator through the power generation units, parallel connection of the plurality of degrees of freedom and overlay utilization of corresponding energy are achieved, andrelatively high benefits are achieved; and resonance springs are arranged at the two ends of horizontal rods and vertical motion rods, collision impact force can be reduced, return motion of a floatis facilitated, and motion of the float in directions of the degrees of freedom is more continuous due to a simple harmonic motion effect under the action of intermittent waves.