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Kramer graph
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Kramer graph : ウィキペディア英語版
Kramer graph
A Kramer graph is a specific multiple-line 2D geometric symbolic representation of the characteristics of intake, scavenging and exhaust components in a two-stroke cycle engine.
They are typically used to visualize the opening time versus area and/ or lift of the following components:
* Intake port / valve
* Scavenging port / valve
* Exhaust port / valve
* Reed inlet valve
* Rotary inlet valve
They do not show the specific configuration of ports like in a port-map, which enables it to illustrate a more useful visualization of port area distribution,
This could be useful because different types of port configurations could have the same opening time and area.
In these graphs the X-axis represents the crankshaft angle (θ) in degrees, and the left Y-axis represents the open area in any square unit of measure such as cm². To discern the different types of ports each type is given a designated color.
For example (commonly used):
* Blue - Intake system
* Green - Scavenging system
* Red - Exhaust system
* Purple - Inlet valve
Kramer graphs are named after Dutch engineer H. Kramer, who is considered to have been the first to use this type of graph in a publication on the effect of port shape and area on two-stroke cycle engine performance.



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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