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1338 results about "Dynamometer" patented technology

A dynamometer or "dyno" for short, is a device for simultaneously measuring the torque and rotational speed (RPM) of an engine, motor or other rotating prime mover so that its instantaneous power may be calculated, and usually displayed by the dynamometer itself as kW or bhp.

Dynamic load simulating device and method for automobile power system test

The invention relates to a dynamic load simulating device and a dynamic load simulating method for an automobile power system test, and belongs to the technical field of vehicle power system tests. The dynamic load simulating device comprises a control computer, a dynamometer controller, a frequency converter, an alternating current (AC) power dynamometer and a torque flange with a controller. A virtual automobile model-based control algorithm is adopted, a virtual automobile model is driven by an actual measurement torque, and the simulation of the rolling resistance, wind resistance and the inertia resistance of a vehicle is realized under the conditions of not calculating angular acceleration of the dynamometer. The dynamic load simulating device and the dynamic load simulating method have high stability and high simulation precision, are favorable for shortening the development cycle of an automobile power system and providing convenient test environment for the development of the power system. A process that the vehicle acceleration is acquired by differentiating the rotation speed of the automobile power system is avoided in the calculation process, and a phenomenon that accurate differential values are difficult to acquire due to relatively large noise caused by the process of differentiating the rotation speed is prevented.
Owner:TSINGHUA UNIV

Test method of automobile transmission system efficiency

The invention relates to a test method of automobile transmission system efficiency, which comprises the following steps: a variable frequency and variable speed motor is connected with an automobile transmission system through a revolution speed and torque sensor; two eddy current dynamometers are respectively connected with two half shafts of the automobile transmission system through the revolution speed and torque sensor; a speed variator of the automobile transmission system is positioned at a certain shift; the target rotation speed of the two half shafts under the rotation speed of a certain variable frequency and variable speed motor is determined according to the transmission ratio; the variable frequency and variable speed motor is started, the eddy current dynamometers load the two half shafts respectively so that the two half shafts can reach the target rotation speed, and then the product of the sum of the torque of the two half shafts and the rotation speed of the half shafts is the output power of the automobile transmission system; and the output power and the product of the torque and the rotation speed of the variable frequency and variable speed motor are compared to obtain the transmission efficiency of the automobile transmission system. The test method is simple, and has quick dynamic response and high testing precision.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD

Vehicle driving condition establishment method combining principal component analysis with fuzzy c-mean clustering

The invention discloses a vehicle driving condition establishment method combining principal component analysis with fuzzy c-mean clustering. The method comprises the steps of extracting satellite positioning data of each road traffic condition in a vehicle dynamic monitoring system of a road transport enterprise, and calculating and dividing the data into small sections of micro-strokes; and performing calculation of characteristic parameters such as an average speed, an idle time proportion and the like for each micro-stroke, obtaining a matrix of a sample quantity (row) X the characteristic parameters (column), adopting mean normalization and principal component analysis for matrix data, selecting preorder principal components which meet the conditions that the cumulative contribution rate of characteristic values of the principal components is greater than 85% and the principal components can comprehensively reflect all the characteristic parameters, performing fuzzy c-mean clustering analysis on scores of the principal components, and clustering the micro-strokes into different groups, namely, screening sub-conditions. An initial synthesis condition is smoothed by adopting a filter with a double-weighted smoothing kernel function. According to the method, existing satellite positioning data is fully utilized; compliance testing is easily carried out on a dynamometer; relatively high universality is achieved; and the research cost of vehicle driving condition establishment is reduced.
Owner:RES INST OF HIGHWAY MINIST OF TRANSPORT

Spherical contact type friction characteristic testing device under ultrasonic vibration

The invention discloses a spherical contact type friction characteristic testing device under ultrasonic vibration. The device consists of a main movement unit, a loading unit and a dynamometer unit, wherein the torque output by a step motor is converted into axial pressure of a sliding table through a lead screw nut pair of a trapezoidal screw, and an upper sample and a lower sample which are arranged at the bottom of a piezoelectric micromachined ultrasonic transducer are contacted with each other, and certain pressure is applied to the lower sample; when the piezoelectric micromachined ultrasonic transducer is connected with an ultrasonic power supply, the upper sample produces ultrasonic frequency vibration with micron-grade amplitude in the horizontal direction or the vertical direction, the lower sample rotates together with a rotating platform and forms a friction pair with the upper sample, so that the friction characteristic of the spherical contact under ultrasonic vibration can be tested. The device can be used for accurately controlling the testing parameters, is high in degree of automation, and can be used for performing spherical contact friction experiments of various types of friction materials under different ultrasonic vibration frequencies and vibration amplitudes.
Owner:JILIN UNIV

Electromagnetic clutch dynamic torque automatic test method and apparatus of automobile air conditioner compressor

The present invention provides an automatic test method and apparatus for vehicle air conditioner compressor electromagnetic clutch dynamic torsional moment, comprising a mainly supporting component (2), a torque revolution speed transducer (3), an electric eddy current dynamometer (4) and an electrical control system, wherein the electromagnetic clutch (1) is installed on the left end of the supporting component to form a cantilever structure, and is driven to rotate through a belt pulley of the electromagnetic clutch driven by a frequency conversion motor; the right end of the supporting component is linked with the torque revolution speed transducer and the electric eddy current dynamometer separately by a coupling, the torque revolution speed transducer and the electric eddy current dynamometer are both installed on each seat to ensure the axiality to be consistent with the supporting component main shaft. The automatic test method and apparatus can simulate air conditioner electromagnetic clutch actual use condition factually, test dynamic parameter variation regularity with the existing of revolution speed spectrum and torque loading spectrum, observe and research dynamic procedure in full, and provide science foundation for evaluating performance, lifetime and reliability thereof.
Owner:LUOYANG BEARING SCI & TECH CO LTD

Loading device for testing permeability of concrete chloride ions and test method

The invention discloses a loading device for testing the permeability of concrete chloride ions, which comprises a longitudinal loading system and a lateral loading system, wherein the longitudinal loading system comprises a longitudinal bearing steel plate, an 'L'-shaped positioning piece, a lateral high-strength transmission screw, a longitudinal steel base plate, a longitudinal dynamometer, a longitudinal ball seat, a longitudinal loading steel plate, a longitudinal hydraulic jack, a longitudinal fixing steel plate and the like; and the lateral loading system comprises a lateral bearing steel plate, an 'L'-shaped test piece block, a longitudinal high-strength transmission screw, a lateral steel base plate, a lateral dynamometer, a lateral ball seat, a lateral loading steel plate, a lateral hydraulic jack, a lateral fixing steel plate and the like. The invention also relates to a test method for testing the permeability of the concrete chloride ions by utilizing the loading device. The loading device and the test method solve the problems that the conventional device for testing the permeability of the concrete chloride ions cannot load tested pieces, cannot simulate the actual load condition of the conventional concrete and cannot measure the permeability of the concrete chloride ions under the condition of pressure load.
Owner:HOHAI UNIV +1

Dynamic loading device for high-speed motorized spindle

ActiveCN102426097ARestoration of different types of stress situationsHigh vibration frequencyMachine gearing/transmission testingCouplingDynamometer
The invention discloses a dynamic loading device for a high-speed motorized spindle. The device comprises a supporting part and a loading part, wherein the supporting part comprises a spindle base, an axial loading bracket, a radial loading base plate and a dynamometer base. The spindle base comprises a spindle base plate, an adjusting base plate and a clamping mechanism. The loading part comprises a radial loading mechanism, an axial loading mechanism, a torque loading mechanism, a loading rod and a bearing unit. The torque loading mechanism comprises a power dynamometer and a high-speed spring tube coupling. The adjusting base plate and the clamping mechanism are overlapped on the spindle base plate and are fixedly connected with each other; the power dynamometer is fixed on the dynamometer base and is connected with the right end of the loading rod through the high-speed spring tube coupling; the left end of the loading rod is connected with the right end of a detected high-speed motorized spindle which is arranged in the clamping mechanism. The bearing unit is sleeved on the loading rod; the radial loading mechanism is arranged on the radial loading base plate and is positioned just below the bearing unit; and one end of the axial loading mechanism is arranged on the axial loading bracket, and the other end of the axial loading mechanism is in contact connection with the bearing unit.
Owner:JILIN UNIV

Motor test system and control method for electric vehicle

The invention discloses a motor test system for an electric vehicle, and solves the problems that a motor test system in the prior art can not meet neither constant-torque loading when an electric vehicle motor runs below the rated rotational speed nor constant-power loading when the electric vehicle motor runs above the rated rotational speed. The motor test system comprises a tested-motor controller connected with a tested motor and used for controlling the state of the tested motor simulating the operation of the electric vehicle, an AC power dynamometer connected with the output terminal of the shaft of the tested motor and used for providing a load for the tested motor and the controller so as to simulate the required power output during actual operation of the electric vehicle, a dynamometer controller connected with the dynamometer and used for controlling the dynamometer to provide a resisting force for both the tested motor and the tested-motor controller when the tested motor simulates the operation of the electric vehicle, and a rotational speed and torque sensor connected with the output shaft of the tested motor and used for measuring both the rotational speed and the torque of the tested motor. The motor test system can improve the accuracy in testing the electric vehicle motor.
Owner:株洲中达特科电子科技有限公司

Folding wings pneumatic loading unfolding experiment device

ActiveCN103123292ASolve problems that take a long timeEasy to adjust loading forceAerodynamic testingRotational axisThrust bearing
The invention relates to a folding wings pneumatic loading unfolding experiment device consisting of two force-augmentation devices, a servo arm swing mechanism and a rack. The force-augmentation device comprises a gas source, a pressure-reducing valve, a cylinder, a force sensor and a digital dynamometer, wherein the gas source transmits gas to the cylinder through pressure adjustment of the pressure-reducing valve, the force sensor and the digital dynamometer can accurately measure augmented force. The servo arm swing mechanism includes a thrust bearing support, and two radial bearings positioned rotating shafts and rotating arms on up and down portions. One end of a steel cable is connected to ring-pull screws of a sensor, and the other end of the steel cable winding on a front roller seat, a back roller seat and a roller on a tumbler is connected to force-bearing points of the folding wings. The folding wings pneumatic loading unfolding experiment device has a simple structure, a big adjustment range for the augmented force, a convenient and easy operation method, and high test efficiency. In the unfolding process of the folding wings, the servo arm swing mechanism can rotate around the folding wings to ensure the augmented force to always be perpendicular to the folding wings, which is particularly suitable for small and medium sized folding wings loading unfolding experiments.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Method for detecting loss of field of rotor of permanent magnet synchronous motor

The invention relates to a method for detecting loss of field of a rotor of a permanent magnet synchronous motor and belongs to the technical field of electric automobile power assembly. The method comprises steps of setting the rotary speed by using a host computer, controlling the motor to run to be in a stable state, increasing the current value continuously, observing whether the torque measured by a dynamometer is increased correspondingly, primarily determining whether a permanent magnet synchronous motor rotor is in loss of field, under the condition that the loss of field may exist, controlling the motor to run in an empty mode to be in a stable state, decreasing the current value continuously, observing whether the difference of all-phase motor voltage and motor no-load back electromotive force rating data measured by the dynamometer is large, and determining whether the permanent magnet synchronous motor rotor is in loss of field. Under the condition that any device is not added, the quick detection of loss of field of car motors can be achieved based on the test of the permanent magnet synchronous motor, the detection speed of the permanent magnet synchronous motor of the electric car is greatly improved, the implementation mode is simple, the cost is low and the application range is wide.
Owner:SHANGHAI ZHONGKE SHENJIANG ELECTRIC VEHICLE
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