36results about How to "Eliminate resonance phenomenon" patented technology

The invention discloses a transmission type optical fiber turbulence sensor. The transmission type optical fiber turbulence sensor comprises a vibration isolator and a bracket, wherein a connecting rod on the upper part of the vibration isolator supports the bracket; a supporting rod on the lower part of the vibration isolator is arranged on the pedestal; the bracket consists of a forked plate and symmetrical forked arms; two paths of optical fiber are arranged on the forked plate; one end of the each path of optical fiber is led to the end of each forked arm; an optical fiber collimator is connected with the end of each forked arm; the other end of the optical fiber is led out of the forked plate and is connected with an optical fiber connector; each path of optical fiber is connected with an optical fiber coupler and an optical isolator; and the optical fiber couplers of the two paths of optical fiber are connected with each other through the optical fiber. Based on the laser interference measurement principle, the transmission type optical fiber turbulence sensor has the characteristics of high precision, quick response, small volume, high stability, corrosion resistance, convenience of forming sensor arrays and the like. The transmission type optical fiber turbulence sensor can precisely detect tiny refractive index change of atmospheric optical turbulence, and related optical turbulence intensity, time and spatial frequency spectrum and the like.

The invention discloses a suspension device of an automotive exhaust system capable of adjusting the angle of a lifting lug, comprising the lifting lug, a connection pin I, a connection pin II, a support I provided with a chute and a support II provided with a chute, wherein, the connection pin I and the connection pin II are connected with the support I and the support II through the chutes, andare connected with the lifting lug. The suspension device of the invention can conveniently adjust the installation angle of the lifting lug relative to the automotive body, can adjust the lifting lug at any time according to actual conditions, and eliminates covibration to the greatest extent, thus leading the transmission amount of the vibration of the exhaust system to the automobile body to reach the lowest value, improving comfort of a control cabin, reducing noise pollution and prolonging the service life of the suspension device; and meanwhile, when a vibration test of the exhaust system is performed, multiple different suspension devices need not to be manufactured, thus large scale adjustment of the lifting lug angle is realized, thereby realizing tests of lifting lugs at different installation angles, which has an important significance in improving work efficiency, shortening development cycle and lowering development cost in the development process of automobiles.

The invention belongs to the field for a motor brake technology, and particularly relates to the field of a brake technology which is applied to a vibratory screen motor of an asphalt concrete stirring apparatus. According to the characteristics of the vibratory screen of an asphalt mixing station, a timing controller is utilized for accurate control over the time of connection with a reverse phase sequence power supply and the time of reversal connection brake, and a brake power supply is connected or removed based on the time. Compared to the prior art, the brake device and the brake method provided by the invention can eliminate the resonance vibration during the shutdown process of the vibratory screen, the stable shutdown of the vibratory screen and a main building apparatus can be realized, the service life of the vibratory screen and the main building apparatus is prolonged, and the shutdown time is reduced by over 60%, thus the apparatus can be put into production again, and the production efficiency is improved.

The invention relates to an automobile constant speed driving shaft. The automobile constant speed driving shaft comprises a left half axle and a right half axle, wherein the left end of the left half axle is assembled with a left side wheel through a left half axle fixed knot, the right end of the left half axle is assembled with a left side half axle gear of a differential mechanism in a power transmission device through a left half axle moving knot, the left end of the right half axle is assembled with a right side half axle gear of the differential mechanism in the power transmission device through a right half axle moving knot, the right end of the right half axle is assembled with a right side wheel through a right half axle fixed knot, the right half axle is of a hollow axle tube structure, the left half axle is of a solid rod axle structure, the length of the right half axle hollow axle tube is X, the length of the left half axle solid rod axle is Y, X is greater than Y, the torsion rigidity of the right half axle is K right, the torsion rigidity of the left half axle is K left, and the K right is equal to the K left. The automobile constant speed driving shaft not only solves the off-tracking problem during dynamic load acceleration running of the whole vehicle caused by inconsistent torsion angles of the left half axle and the right half axle, but also eliminates resonance phenomenon caused by different rotating speed working conditions of the engine, so that the NVH (Noise Vibration and Harshness) performances and economical performance of the vehicle are improved.

The invention provides an automatic fire extinguishing system. With the system, a problem of resonance easily caused by a plurality of simultaneously operating extinguishing devices in the system is solved. The automatic fire extinguishing system provided by the invention comprises an induction apparatus, a fire alarm controller, a gas fire-extinguishing control panel, a starting module, an extinguishing device, and a damper. According to the automatic fire extinguishing system provided by the invention, all extinguishing devices in a preset protected zone are started sequentially, such that the phenomenon of resonance is avoided, and a secondary disaster caused by the resonance phenomenon is avoided. Therefore, life and property safeties in the preset protected zone are ensured.

Power system ferroresonance is a nonlinearity electromagnetic phenomenon. Ferroresonance can be simulated by change of operation methods of a power system and operation of system equipment. Long-time overvoltage and overcurrent produced by the ferroresonance threaten the safety of the power system greatly. The method for fast eliminating the power system ferroresonance comprises a first step of giving a model of providing one-phase ferroresonance equivalent linear timevariant and a state equation of an equivalent circuit according to a transformer substation wiring diagram of the ferroresonance, and a second step of eliminating the one-phase ferromagnetic resonance phenomena by utilizing of a simplest controller, and a third step of verifying correctness of a conclusion through experiments.

The invention discloses a fuel accelerator of an internal combustion engine. The fuel accelerator comprises a magnetizer and is characterized in that the magnetizer comprises two permanent magnets arranged in a shell, wherein different magnetic poles of the two permanent magnets are correspondingly superposed, the end surfaces of magnetic poles of one permanent magnet correspond to oil tubes, are provided with shielding layers and are superposed with the end surfaces of magnetic poles of the other permanent magnet; isolation layers are arranged between the shielding layers and the end surfaces of the magnetic poles; the middle parts of the isolation layers are provided with through holes. The fuel accelerator is provided with two magnets, and is high in magnetic field intensity; magnetic lines facing to the oil tubes are not shielded, effective magnetic lines can be fully utilized, the surface utilization ratio of the magnetic poles is high, the effective range is large, the action time is long, and the oil-saving and emission-reducing effects are better.

The invention relates to a connected building. The connected building comprises main frame structures, orridor structures, longitudinal limiting components and transverse limiting components; two or more main frame structures are arranged side by side, the corridor structures are arranged between every two adjacent main frame structures, and the ends of the corridor structures are in lap joint with the main frame structures through buffer limiting structures; the longitudinal limiting components are arranged on the side edges of the buffering limiting structures and used for limiting longitudinal translation of the corridor structures in the length direction; the transverse limiting components are arranged on the side edges of the buffering limiting structures and used for limiting transverse translation of the corridor structures in the width direction; and the limiting directions of the two longitudinal limiting components located at the two ends of the corridor structures are opposite, and the limiting directions of the two transverse limiting components located at the two ends of the corridor structures are opposite. According to the connected building, the corridor structuresdo not affect the main frame structures, can be firmly connected with the main frame structures and are not prone to falling off from the main frame structures.

The invention provides a signal synchronization control method and apparatus. The signal synchronization control method comprises the following steps: collecting digital logic signals and synchronousclock signals corresponding to the digital logic signals, judging whether the digital logic signals have a resonance phenomenon, and when the digital logic signals have the resonance phenomenon, adjusting the duty ratios of the digital logic signals and the synchronous clock signals according to a preset reference clock to eliminate the resonance phenomenon. By changing the duty ratios of the digital logic signals and the synchronous clock signals, the resonance phenomenon between the digital logic signals is eliminated, the number of the digital logic signals that jump to the falling edge under the triggering on the rising edge of the respective synchronous clock signals can be reduced, and the "resonance" phenomenon is reduced, thereby reducing the electromagnetic interference to an MCUand improving the stability of the system.

The invention provides a LCL type grid-connected inverter improved weighted average current control method . The control method comprises the following steps: connecting an LCL type filter to the output end of a main circuit of the inverter; multiplying the current given value by the output phase information of the phase-locked loop to obtain a current reference signal, wherein the current reference signal obtains a control signal of the outer loop proportional resonance controller under the action of a feedback signal of the weighted average current of the LCL type filter; adopting a signal of a current signal output by the outer-loop proportional resonance controller under the action of a feedback signal of the filter capacitor current as a control signal of the inner-loop proportional controller, and adopting an output signal of the inner-loop proportional controller as a reference signal of the sine pulse width modulation controller; and adopting the sine pulse width modulation controller for controlling the conduction state of the switching tube of the main circuit. According to the invention, the damping coefficient of the control system is increased, the resonance of the LCL type filter is suppressed, the stability is ensured, and the power factor and the waveform quality of the grid-connected current are hardly influenced.

The invention provides a liquid nano detergent. The liquid nano detergent is prepared from the following raw material components in parts by weight: 6 parts of base oil, 0.07 part of isooctyl nitrate, 0.35 part of polyoxymethylene dimethyl ether, 0.03 part of a modifier and 1.2 parts of isooctyl alcohol. Wherein the modifier is a mixture of nonylphenol polyoxyethylene ether 3 (OP-3), Mannich alkali and ferrocene according to a mass ratio of 11: 1: 2.5. According to the invention, the polyoxymethylene dimethyl ether is used as a solvent with extremely strong dissolving capacity, so that the polyoxymethylene dimethyl ether and the white oil have a synergistic effect, thereby really realizing liquid nanocrystallization; besides, the inventor discovers that the synergistic effect of polyoxymethylene dimethyl ether and isooctyl nitrate exceeds the simple superposition function of '1 + 1 = 2' in the aspect of improving the cetane number and the oxygen content of the diesel oil, and the synergistic effect of polyoxymethylene dimethyl ether and isooctyl nitrate shows an excellent and outstanding effect in improving the cetane number and the oxygen content of the diesel oil.

A potential-energy car features that multiple groups of high-strength spiral alloy springs are tightly turned by external force (electric power) for gradually accumulating potential energy and then locked and gradually released by a special control mechanism to drive a gear chain to do work, and the brake system and a particular gear shift unit are linked with a gear train for turning said spiral alloy springs, so changing the braking energy to the potential energy for driving the car.

The embodiment of the invention discloses a supercharger, an engine and an automobile. The supercharger comprises a waste gas flow control mechanism and is characterized in that the waste gas flow control mechanism comprises an actuator, the actuator is provided with a counterweight device, the counterweight device comprises at least one balancing weight which is provided with a clamping part, and the counterweight device is arranged on the actuator through the clamping parts. The actuator of the waste gas flow control mechanism is provided with the appropriate counterweight device, the resonance phenomenon of mechanical positive pressure type waste gas by-pass controlling can be eliminated, the noise of the actuator is controlled within the acceptable range of noise, vibration and harshness (NVH) of the finished automobile, universality is high, the period for solving the noise problem is short, and practicality is high.