38 results about "Indirect test" patented technology

The invention discloses a method for indirectly measuring spring rigidity of a linear compressor and mover mass. The method comprises the following steps: connecting acoustic load in an outlet of the compressor to pressurize the whole system; determining at least two groups of incompletely-equivalent acoustic impedance imaginary parts and angular frequency data under the condition that the acoustic impedance real parts of the acoustic load are ensured to be unchanged; combining resonance conditions of the compressor; and calculating to obtain the spring rigidity and the mover mass, wherein the angular frequency data is angular frequency corresponding to highest electro-acoustic conversion efficiency of the compressor. Compared with the prior art, the method has the beneficial effects that: on the premise of not disassembling the linear compressor, an indirect test is performed on the compressor, the test method is simple and easy to operate, and damages, caused by disassembling the compressor, to internal structural parts of the compressor are avoided.

The invention relates to a device for indirectly testing the one-time purification efficiency of an air purifying component and a method thereof. On the basis of the prior art, the method comprises the following steps of: firstly closing a test passageway before testing by setting an adjusting passageway; adjusting the concentration and the humiture of a pollutant in a test cabin through the adjusting passageway to be a set value; and testing. The invention has the advantages that the invention controls the concentration of the pollutant which enters into the front end of a purifying component to be a constant value by adjusting a pollutant-generating device, thereby guaranteeing that the one-time purification efficiency is tested under the constant concentration of the blowing-in pollutant, preventing the computation of the one-time efficiency from having an error, leading a testing result to be more exact, and guaranteeing the purification efficiency and the accuracy of the test computation of the purification life.

The invention discloses a worked-out-section residual coal oxidizing temperature indirect test and alarm device which is applicable to detection and alarm for the oxidizing temperature of residual coal in places where people are hard to enter therein, such as a worked out section under an underground coal mine. The device is composed of small gas-releasing holes (1), an upper high-strength steel ball half (2), a glass ball (3), temperature-sensing special smell liquid (4), a steel wire gauze (5), a breathable cushioning light interlayer (6) and a lower high-strength steel ball half (8). When the temperature of the worked out section rises, the temperature-sensing special smell liquid (4) is heated to be expanded, the glass ball (3) is squeezed and crushed, then special smell is released, the special smell is emitted to the worked out section through the cushioning light interlayer (6) and the small gas-releasing holes (1) in the surface of a high-strength steel ball, gas is diffused to corners on the work surface under the action of air leakage of the worked out section, the category of the smell of the gas flowing out of the positions, located at the corners, of the worked out section is tested, and whether the oxidizing temperature of the residual coal at a certain point of the worked out section reaches a set alarm value or not is judged.

The invention discloses a method for indirectly measuring motor specific thrust and a mechanical damping coefficient of a linear compressor. The method comprises the following steps of connecting an acoustic load to an outlet of the compressor; pressurizing a whole system; finding out corresponding running frequency of the linear compressor when electric-acoustic conversion efficiency is maximum at the time by adjusting the running frequency of the linear compressor; adjusting an acoustic impedance real part under the running frequency condition; finding out the current compressor maximum electric-acoustic conversion efficiency and the corresponding acoustic impedance real part at the time by detection; and calculating to obtain the motor specific thrust and the mechanical damping coefficient. By the method, the motor specific thrust alpha and the mechanical damping coefficient Rm of the linear compressor can be detected simply. Compared with the existing testing method, the method has the advantages that the compressor can be indirectly tested on the premise that the linear compressor does not need to be disassembled, the testing method is simple and is easy to operate, and the circumstance that components of an inner structure are damaged due to disassembling of the compressor is avoided.

The invention discloses an indirect test method for explosion-proof pressure of a metal battery shell, and aims to provide an indirect test method for explosion-proof pressure for realizing the measurement of the explosion-proof pressure by quantitatively detecting the residue thickness of an explosion-proof valve with high test speed, high accuracy and no damage to the metal shell. The method comprises the following steps: carrying out regression analysis for the explosion-proof pressure of the metal battery shell and the residue thickness of the explosion-proof valve to obtain a fitted equation of the residue thickness of the explosion-proof valve and the explosion-proof pressure of the battery shell; measuring the residue thickness of the explosion-proof valve of the metal battery shell to be tested; and inserting the residue thickness of the explosion-proof valve of the metal battery shell to be tested into the fitted equation of the residue thickness of the explosion-proof valve and the explosion-proof pressure of the metal battery shell to obtain the explosion-proof pressure of the metal battery shell to be tested. The method of the invention belongs to indirect and non-destructive test, and has no damage to the metal shell. And the method has the advantages of high measurement speed for the residue thickness, high accuracy, good test repeatability for the explosion-proof pressure, neat test environment and convenient measurement.