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196 results about "Sensor selection" patented technology

Harsh environment gas sensor apparatus and method

Provided is an apparatus for gas sampling from a harsh environment which comprises a chemically resistant plastic housing suitable for suspension in a confined spacial environment. The housing has apertures for inlet and outlet tubes by which sampled air is drawn into and then discharged from the housing. Included are two three way valves to control selective fluid communication with the environment, a gas sensor, a filter selectively remove contamination from the housing and prevent saturation of the gas sensor, a pump disposed within the housing to effect selective fluid flow through the gas sensor and filter, and a power source that is preferably batteries. The apparatus electronics are all integrated into an electronics module configured so as to communicate with an external readout in a remote location via several methods. Sampling data is accumulated by a data logger which includes the capacity to retain such information as date and time of sampling, concentration of each sample, and the unit's identification data. The electronics module is in electrical communication with the power source. Power is also supplied to the pump and valves that control the admission of sample gas, direction of it to the sensor, discharge of gas to the harsh environment, and filtration of all the atmosphere within the housing to (1) flush the sensor and (2) clear contamination from the interior of the housing.
Owner:GALAXY OPTOELECTRONICS

Health evaluation method and system for key components and complete machine of numerical control machine tool and evaluation terminal

The invention provides a health evaluation method and system for key components and a complete machine of a numerical control machine tool and an evaluation terminal. The system comprises a data acquisition and preprocessing module, a sample working condition identification module, a health index fusion module, an evaluation index mapping module, a baseline value construction and key component relative evaluation module and a complete machine health evaluation module. Based on cooperation of the above modules, through analysis of redundancy, relevance, sensitivity and stability of measuring point information, sensor selection and layout optimization are achieved, numerical control machine tool sensing information is obtained, and evaluation is conducted. The trend characteristics of the numerical control machine tool can be fused, evaluation indexes of the degradation state of the whole life cycle of the numerical control machine tool are reflected, the problem that the weights of front and back time sequence information are unbalanced due to the fact that the input information cycle is too long is effectively solved, and the health evaluation accuracy is improved. Health evaluation is carried out by establishing the baseline value, and the health evaluation precision of the key components and the complete machine of the numerical control machine tool is improved.
Owner:CHINA NAT MASCH TOOL QUALITY SUPERVISION TESTING CENT

Method for predicting complete residual life of aero-engine under variable working conditions based on working condition identification and similarity matching

The invention discloses a method for predicting the complete residual life of an aero-engine under variable working conditions based on working condition identification and similarity matching. According to the method, the problem that the complete residual life is difficult to predict due to degradation trend of the real performance, covered by complex working condition variation, of the aero-engine is focused to be solved. The method comprises the following steps: identifying operation conditions of the aero-engine; carrying out data standardization on historical degradation data under different working conditions; carrying out sensor selection and parameter dimensionality reduction on the standardized data; matching degeneration tracks of each reference engine and a to-be-predicted engine by virtue of a similarity matching method, so as to obtain an estimated value of the residual life of the to-be-predicted engine and the similarity distance between the reference engine and the to-be-predicted engine; and generating a weight according to the similarity distance, and weighing life estimated values, so as to obtain the residual life of the to-be-predicted engine. By verification, the method has relative high prediction accuracies for different engine test samples.
Owner:北京恒兴易康科技有限公司
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