A method for calculating the contribution degree of non-combustion excitation signal based on partial coherence function
An excitation signal, non-combustion technology, applied in the direction of internal combustion engine testing, etc.
Active Publication Date: 2021-09-10
JIANGSU UNIV
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the influence of piston side pressure and crankshaft main journal load on the vibration response of combustion excitation can be ignored, and the influence of piston reversing impact on vibration displacement and vibration velocity caused by combustion excitation can be ignored; but the influence on vibration acceleration caused by combustion excitation cannot be ignored
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.
[0038] Such as figure 1 As shown, the schematic diagram of the opening and closing moments of the two cylinder valves in the working cycle of the SD2100TA diesel engine. The valve opening and closing excitation is also an important excitation source of the vibration response signal. For a multi-cylinder engine, there may be coupling between the adjacent cylinder valve opening, closing excitation vibration response and combustion excitation vibration response. It can be seen from the figure that there are no other non-combustion excitation signals before the ignition of the two cylinders. Therefore, there is no synchronization in the time domain between valve opening, closing excitation and combustion excitation, and the characteristics of the response signal can be ignor...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for solving the contribution degree of non-combustion excitation signals based on a partial coherence function, including step 1, determining the main non-combustion excitation source; step 2, determining the non-combustion excitation that plays a primary role in the vibration signal; step 3, according to For the primary non-combustion excitation determined in step two, use the partial coherence function to calculate the contribution of the excitation signal to the vibration signal at a specific frequency. Beneficial effects: the present invention determines the contribution degree of the non-combustion excitation signal to the vibration signal, which is the basis for research and elimination of interference in the vibration signal, and helps to repair part of the combustion information in the vibration signal, and is beneficial to the realization of using the vibration signal to extract combustion information, internal combustion engine Working state monitoring, closed-loop control of combustion process and fault diagnosis have important theoretical significance and practical value.
Description
technical field [0001] The invention relates to a method for calculating a contribution degree, in particular to a method for solving the contribution degree of a non-combustion excitation signal based on a partial coherence function, and belongs to the technical field of internal combustion engines. Background technique [0002] The vibration signal of the internal combustion engine is the result of the combined action of combustion excitation and non-combustion excitation such as reciprocating inertial force, valve seat impact force, piston reversing impact force, piston side pressure and crankshaft main journal load. Moreover, the non-combustion excitation is coupled with the combustion excitation in the time domain and frequency domain, which makes it difficult to eliminate the non-combustion excitation response signal, and even affects the integrity of the combustion excitation response signal. [0003] In the article "Simulation Analysis of the Influence of Non-combust...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/12
CPCG01M15/12
Inventor 赵秀亮潘邦雄赵文耀汪若尘王丽梅
Owner JIANGSU UNIV