Study on the Detection Method and Measurement System of Head Flatness Error on Non-contact Detection

Abstract

Abstract：In order to solve the problem of engine cylinder head casting production process of the bottom of the cylinder head surface flatness error detection problem， the design of a laser non-contact cylinder head surface flatness on-line detection system, a method of flatness error detection based on diagonal line is proposed. According to the field flatness detection demand design using laser arm axis and cylinder head horizontal transfer reciprocation engine cylinder head surface flatness error detection system; Through the engine cylinder head surface detection feature point four corners diagonal midline build a mathematical model of the engine cylinder head flatness testing, regression equation to determine the method of least squares plane is ideal plane, calculated flatness error; The laser displacement sensor calibration, given the sensor error calibration regression equation and application of the detection system on different types of engine cylinder head detection. The results showed that：The system has a maximum detection area of 400 mm×2 000 mm, the measurement range of 160-450 mm, the measurement accuracy of 0.03 mm, and simple structure, speed, and is fully capable of reality testing requirements.

Evaluation System of Tourism Endowment Destination Based on Tourism Endowment Index

“…Following each round, the index system was sorted according to expert judgments and statistical findings, and the appropriate findings were communicated to them. They were encouraged to reevaluate the adjusted index system, and they were expected to revise and verify the evaluation results (Shan, 2008). After three rounds of study, Table 4 displays the degree of expert opinion emphasis on index layer indices.…”

“…Comprehensive evaluation of tourism endowment destination. The TEI is graded according to the Shan (2008) index level scale (Table 7), which allows for a more objective and comprehensive evaluation of the tourism endowment destination index.…”