基于Matlab修改Abaqus.inp文件并批量执行仿真的问题求助

Your current script has two key issues that cause extra lines and missing content:

1. The textscan call forces splitting every line by commas, which doesn't match the INP file's structure (most lines use spaces/tabs as separators, not commas). This breaks lines into individual words instead of preserving full rows.
2. By only taking c{1}, you're discarding all columns except the first, then printing each element as a new line—hence the inflated line count.

Here's a robust, fixed approach that preserves the original INP file structure while modifying your target parameter:

Solution 1: Modify by Fixed Line Number (Your Current Workflow) #

This keeps using the confirmed line number but processes the file row-by-row to retain formatting:

% Read all lines of the original INP file (preserves exact formatting)
original_lines = readlines('PRD8_30s.inp');

% Define your target line and new parameter value
target_line = 12496;
new_A_value = '5e-08';

% Split the target line into its components (handles spaces/tabs)
line_components = strsplit(strtrim(original_lines(target_line)), '\s+');
% Replace the first value (adjust the index if your A value isn't the first element)
line_components{1} = new_A_value;
% Reconstruct the line with original-style spacing (4 spaces here, match your file)
original_lines(target_line) = strjoin(line_components, '    ');

% Write the modified lines to a new INP file
writelines(original_lines, 'file_modified.inp');

% Optional: Run the Abaqus simulation directly from Matlab
system('abaqus job=file_modified input=file_modified.inp');

Solution 2: More Robust (No Fixed Line Number) #

If your INP file's structure might change (e.g., line numbers shift), this method finds the *Viscoelastic block dynamically instead of relying on hardcoded line numbers:

original_lines = readlines('PRD8_30s.inp');
new_A_value = '5e-08';
found_viscoelastic = false;

for i = 1:length(original_lines)
    current_line = strtrim(original_lines(i));
    
    % Look for the start of the Viscoelastic block
    if startsWith(current_line, '*Viscoelastic')
        found_viscoelastic = true;
        continue;
    end
    
    % Once found, modify the first non-comment, non-empty line below it
    if found_viscoelastic && ~startsWith(current_line, '**') && ~isempty(current_line)
        line_components = strsplit(current_line, '\s+');
        line_components{1} = new_A_value; % Adjust index if needed
        original_lines(i) = strjoin(line_components, '    ');
        break; % Exit loop after modifying the target line
    end
end

writelines(original_lines, 'file_modified.inp');
system('abaqus job=file_modified input=file_modified.inp');

Key Notes for Your Batch Simulation: #

• Batch Processing: To run 50 simulations, wrap this code in a loop. Define an array of 50 A values, then generate unique filenames (e.g., file_1.inp, file_2.inp) for each iteration.
• Parameter Position: Double-check the index in line_components{X}—if your A value is the second element in the line, use line_components{2} instead of {1}.
• Formatting: Abaqus is flexible with spacing, but using the same separator as your original file (spaces, tabs) ensures no parsing issues.

内容的提问来源于stack exchange，提问作者Dipok