Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- en:berechnungen:einfache_berechnung [2024/10/27 20:03] – neelest
+++ en:berechnungen:einfache_berechnung [2025/07/03 13:33] (aktuell) – cschall
@@ Zeile 26: / Zeile 26: @@
 ==== Process parameters ====
-A distinction is made between required and optional process parameters. \\
+See [[en:eingabe_der_verfahrensparameter:eingabe_der_verfahrensparameter|Define process parameters]]
-The necessary parameters are required for a calculation. \\
-Optional parameters are voluntary inputs that can lead to improved simulation accuracy if the process variables are known.
-=== Necessary process parameters ===
-{{ :berechnungen:rex171_ber_001_en.png?nolink |}}
-The necessary process parameters require the following inputs:
-  * Optional specification of a circumferential speed/screw speed **OR** specification of a throughput (speed-orientated). \\ If the mass throughput is specified, the speed is calculated iteratively so that the specified throughput is achieved. \\ The specification of a throughput together with a speed is possible via the optional specification of the mass throughput.
-  * Pressure at the screw tip (specified or mould characteristic curve if a mould is defined)
-  * Pressure at the front edge of the hopper
-  * Specification of the final melt temperature (for an initial temperature profile, see also ‘Iterate temperature’ in the calculation settings)
-  * Raw material inlet temperature
-=== Optional process parameters ===
-{{ :berechnungen:berechnungseinstellungen:rex171_ber_004_en.png?nolink |}}
-Values can be entered for the optional process parameters with the aim of achieving a more precise calculation accuracy. The following can be specified:
-  * Location of the melt vortex formation (OSW). Melting begins at this point
-  * Start of disperse melting. From this point at the **latest** the calculation continues with the disperse melting model
-  * Throughput (at a specified speed)
-  * Parameters for the characteristic curve field. 3 speeds and 3 back pressures can be specified here so that characteristic curves for the extruder can be calculated automatically in a full factorial test plan (9 test points) (not yet implemented in REXng)
-{{ :berechnungen:rex171_ber_010_en.png?nolink |}}
 ==== Calculation settings ====
@@ Zeile 57: / Zeile 34: @@
 The calculation settings are divided into 4 sections:
-=== Throughput ===
+===1. Throughput ===
-  * see also [[en:berechnungen:durchsatz|Throughput]]
+see also [[en:berechnungen:durchsatz|Throughput]]
 Three basic settings are possible here \\
     * **Melt dominated**: Standard setting, melt conveying dominates the throughput
     * **Coupling solids conveying**: the [[en:berechnungen:feststofffoerderung|Solids conveying]] of the feed zone is also taken into account
-    * **Slot bushing**: the throughput is determined by the [[en:eingabe_der_zylinderdaten:eingabe_eines_nutbuchsenextruders|Grooved bush]] ([[berechnungen:nutbuchsenberechnung|Grooved bush calculation]]).
+    * **Slot bushing**: the throughput is determined by the [[en:eingabe_der_zylinderdaten:eingabe_eines_nutbuchsenextruders|Grooved bush]] ([[en:berechnungen:nutbuchsenberechnung|Grooved bush calculation]]).
 If a grooved bush is defined, you can also select whether the calculation
-  * **Conveyor stiffness** (default) or
+  * **Stiff feed** (default) or
-  * **limit speed orientated**
+  * **limited speed orientated**
 and the conveying case differentiation can also be selected.
@@ Zeile 73: / Zeile 50: @@
 For **screws with barrier zones**, there are two options for calculating the pressure throughput
-  * The **analytical nodal point method**: based on network theory, standard
+  * The **matrix model** based on network theory, standard
   * Assumption of a **constant pressure gradient** between the solids and melt channel
-If a **barrier zone becomes blocked** (solids bed width y in the solids channel achieved by compressing the channel over 100% channel width, **within** a barrier zone), the following options are available
+If a **barrier zone becomes plugged** (solids bed width y in the solids channel over 100% achieved by compressing the channel, **within** a barrier zone), the following options are available
-  * Continued **conventional melting**, in this case the solid changes into the melt channel and conventional melting is calculated in both channels
+  * Continued **conventional melting**, in this case the the conventional melting continues in the solid channel. A disperse melting is assumed for the melt channel.
-  * **Disperse melting** from the location of the blockage
-If solid bed widths of more than 100% **outside** a barrier zone occur, the melting calculation is cancelled with a warning message.
+If solid bed widths of more than 100% **outside** a barrier section occur, the melting calculation is cancelled with a warning message.
 It is also possible to select whether the message of an insufficient feed throughput through the hopper should be displayed or suppressed. It only makes sense to display the message if a hopper has been defined. Otherwise, a round hopper opening the size of the extruder's nominal diameter is assumed.
-=== Melting ===
+===2. Melting ===
-  * see also [[en:berechnungen:aufschmelzverlauf|Melting]]
+see also [[en:berechnungen:aufschmelzverlauf|Melting]]
 For degassing screws only, three options can be selected:
-  * **to degassing zone**: Standard, the melting calculation stops at the first degassing zone
+  * **till degassing section**: Standard, the melting calculation stops at the first degassing section
-  * **from degassing zone conventional**: conventional melting also in/after the degassing zone. However, if disperse melting has already been forced, for example by a shearing part before the degassing zone, disperse melting will continue to be calculated.
+  * **conventional melting after degassing section**: conventional melting also in/after the degassing section. However, if disperse melting has already been forced, for example by a shearing part before the degassing section, disperse melting will continue to be calculated.
-  * **from degassing zone disperse**: disperse melting in/after the degassing zone
+  * **disperse melting after the degassing section**: disperse melting in/after the degassing zone
-=== Temperature ===
+===3. Temperature ===
-* see also [[en:berechnungen:temperaturverlauf|Temperature]]
+see also [[en:berechnungen:temperaturverlauf|Temperature]]
-* If //Iterate temperature// is **not** selected, the calculation is only calculated with an //initial temperature profile//. This is described by a linear progression of the temperature from the melting temperature ($T_G$ / $T_K$) at the front edge of the hopper to the specified final melt temperature (see necessary process parameters) at the screw tip. For degassing extruders, the specified final melt temperature already applies to the start of the first degassing zone and remains constant thereafter. \\ If //Iteration of the final temperature// is selected, the calculated temperature profile is used iteratively for a new calculation of the entire process until a stationary state (no change in the final temperature) is reached.
+  * If //Iterate temperature// is **not** selected, the calculation is only calculated with an //initial temperature profile//. This is described by a linear progression of the temperature from the melting temperature ($T_G$ / $T_K$) at the front edge of the hopper to the specified final melt temperature (see [[en:eingabe_der_verfahrensparameter:eingabe_der_verfahrensparameter|necessary process parameters]]) at the screw tip. For degassing extruders, the specified final melt temperature already applies to the start of the first degassing zone and remains constant thereafter. \\ If //Iteration of the final temperature// is selected, the calculated temperature profile is used iteratively for a new calculation of the entire process until a stationary state (no change in the final temperature) is reached. \\ Since the influence of the entered melt temperature on the throughput is only minor, the temperature iteration can remain deactivated, provided a reasonable melt temperature can be estimated.
   * If an internal temperature control is defined, the calculation of the internal temperature control can be activated or deactivated.
-=== Power ===
+===4. Power ===
-  * See also [[en:berechnungen:leistung_und_schubspannungen|Power]]
+See also [[en:berechnungen:leistung_und_schubspannungen|Power]]
 Three power models can be selected:
@@ Zeile 115: / Zeile 91: @@
 ===Further topics===
   * [[en:berechnungen:einfache_berechnung|]]
+  * [[en:berechnungen:prozess_iterieren]]
   * [[en:berechnungen:durchsatz|]]
-  * [[en:berechnungen:einrieselverhalten|]]
   * [[en:berechnungen:druckverlauf|]]
   * [[en:berechnungen:aufschmelzverlauf|]]
   * [[en:berechnungen:temperaturverlauf|]]
   * [[en:berechnungen:leistung_und_schubspannungen|]]
+  * [[en:berechnungen:schergeschwindigkeit]]
   * [[en:berechnungen:verweilzeit|]]
   * [[en:berechnungen:verweilzeitverteilung|]]