{"id":486,"date":"2021-12-11T07:24:23","date_gmt":"2021-12-11T07:24:23","guid":{"rendered":"https:\/\/thingslog.com\/fr\/?p=486"},"modified":"2026-04-23T18:55:16","modified_gmt":"2026-04-23T18:55:16","slug":"quest-ce-que-le-controle-de-pression-a-haute-frequence","status":"publish","type":"post","link":"https:\/\/thingslog.com\/fr\/ressources\/quest-ce-que-le-controle-de-pression-a-haute-frequence\/","title":{"rendered":"Qu\u2019est-ce que le contr\u00f4le de pression \u00e0 haute-fr\u00e9quence ?"},"content":{"rendered":"<p>La surveillance classique de la pression dans les r\u00e9seaux d&#8217;eau mesure une valeur toutes les 5, 15 ou 30 minutes. Cette fr\u00e9quence est suffisante pour d\u00e9tecter les tendances de consommation et les variations de pression statique. Mais elle rate compl\u00e8tement les \u00e9v\u00e9nements transitoires qui durent moins d&#8217;une minute : coups de b\u00e9lier, fermetures rapides de vannes, d\u00e9marrages de pompes et ondes de pression. La surveillance \u00e0 haute fr\u00e9quence comble cet angle mort critique.<\/p>\n<h2>Table des mati\u00e8res<\/h2>\n<ul>\n<li><a href=\"#definition\">Qu&#8217;est-ce que la surveillance de pression \u00e0 haute fr\u00e9quence ?<\/a><\/li>\n<li><a href=\"#evenements-detectes\">Quels \u00e9v\u00e9nements peut-on d\u00e9tecter ?<\/a><\/li>\n<li><a href=\"#applications\">Applications et cas d&#8217;usage<\/a><\/li>\n<li><a href=\"#comparaison\">Haute fr\u00e9quence vs basse fr\u00e9quence : comparaison<\/a><\/li>\n<li><a href=\"#implementation\">Comment mettre en \u0153uvre une surveillance haute fr\u00e9quence ?<\/a><\/li>\n<li><a href=\"#thingslog\">Solutions ThingsLog<\/a><\/li>\n<li><a href=\"#faq\">Foire aux questions<\/a><\/li>\n<\/ul>\n<figure class=\"wp-block-table\">\n<table>\n<thead>\n<tr>\n<th>Point cl\u00e9<\/th>\n<th>D\u00e9tails<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Fr\u00e9quence typique<\/td>\n<td>1 mesure par seconde \u00e0 1 000 mesures par seconde selon l&#8217;application<\/td>\n<\/tr>\n<tr>\n<td>\u00c9v\u00e9nements d\u00e9tect\u00e9s<\/td>\n<td>Coups de b\u00e9lier, fuites actives, transitoires de pression, d\u00e9faillances de pompes<\/td>\n<\/tr>\n<tr>\n<td>Applications principales<\/td>\n<td>R\u00e9seaux eau potable, r\u00e9seaux d&#8217;assainissement sous pression, syst\u00e8mes industriels<\/td>\n<\/tr>\n<tr>\n<td>Valeur ajout\u00e9e<\/td>\n<td>Pr\u00e9vention des ruptures de conduites, r\u00e9duction de l&#8217;eau non revenue, conformit\u00e9 r\u00e9glementaire<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 id=\"definition\">Qu&#8217;est-ce que la surveillance de pression \u00e0 haute fr\u00e9quence ?<\/h2>\n<p>La surveillance de pression \u00e0 haute fr\u00e9quence d\u00e9signe l&#8217;enregistrement de mesures de pression \u00e0 des intervalles tr\u00e8s courts. G\u00e9n\u00e9ralement entre <strong>1 et 10 mesures par seconde<\/strong> (1 \u00e0 10 Hz), voire jusqu&#8217;\u00e0 1 000 Hz pour les applications les plus exigeantes. Compar\u00e9e \u00e0 l&#8217;enregistrement traditionnel toutes les 15 minutes, une mesure par seconde multiplie par 900 la r\u00e9solution temporelle des donn\u00e9es.<\/p>\n<p>Cette r\u00e9solution accrue permet de capturer des ph\u00e9nom\u00e8nes hydrauliques fugaces qui sont totalement invisibles dans les enregistrements classiques :<\/p>\n<ul>\n<li>Les coups de b\u00e9lier se produisent en millisecondes \u00e0 quelques secondes<\/li>\n<li>Les ondes de pression g\u00e9n\u00e9r\u00e9es par la fermeture d&#8217;une vanne durent 0,5 \u00e0 5 secondes<\/li>\n<li>Les transitoires li\u00e9s au d\u00e9marrage de pompes durent 1 \u00e0 10 secondes<\/li>\n<li>Les variations de pression associ\u00e9es \u00e0 des fuites actives se manifestent sur quelques secondes<\/li>\n<\/ul>\n<p>En outre, Sans mesure \u00e0 haute fr\u00e9quence, ces \u00e9v\u00e9nements sont compl\u00e8tement invisibles. Et leurs effets cumul\u00e9s sur l&#8217;infrastructure du r\u00e9seau peuvent \u00eatre significatifs sur le long terme.<\/p>\n<h2 id=\"evenements-detectes\">Quels \u00e9v\u00e9nements peut-on d\u00e9tecter avec la surveillance haute fr\u00e9quence ?<\/h2>\n<h3>Coups de b\u00e9lier (transitoires hydrauliques)<\/h3>\n<p>Un coup de b\u00e9lier est une onde de surpression ou de d\u00e9pression brutale qui se propage dans la conduite lors d&#8217;une fermeture rapide d&#8217;une vanne ou d&#8217;un arr\u00eat brusque d&#8217;une pompe. La pression instantan\u00e9e peut atteindre 5 \u00e0 10 fois la pression normale, provoquant :<\/p>\n<ul>\n<li>Ruptures de conduites et de raccords<\/li>\n<li>Dommages aux vannes et aux compteurs<\/li>\n<li>Contamination par aspiration (d\u00e9pression)<\/li>\n<li>Fatigue acc\u00e9l\u00e9r\u00e9e des mat\u00e9riaux sur les cycles r\u00e9p\u00e9t\u00e9s<\/li>\n<\/ul>\n<h3>D\u00e9tection de fuites actives<\/h3>\n<p>Les fuites g\u00e9n\u00e8rent des signatures de pression caract\u00e9ristiques qui peuvent \u00eatre identifi\u00e9es par analyse spectrale des enregistrements haute fr\u00e9quence. La m\u00e9thode de corr\u00e9lation acoustique \u2014 combin\u00e9e \u00e0 la surveillance haute fr\u00e9quence \u2014 permet de localiser les fuites avec une pr\u00e9cision de l&#8217;ordre du m\u00e8tre.<\/p>\n<h3>D\u00e9faillances de pompes<\/h3>\n<p>Le d\u00e9marrage et l&#8217;arr\u00eat de pompes centrifuges g\u00e9n\u00e8rent des profils de pression transitoire caract\u00e9ristiques. Les anomalies dans ces profils (dur\u00e9e de mont\u00e9e en pression anormale, oscillations, absence de la mont\u00e9e attendue) signalent des d\u00e9faillances m\u00e9caniques naissantes avant qu&#8217;elles ne deviennent critiques.<\/p>\n<h3>Claquements de vannes<\/h3>\n<p>La fermeture trop rapide des vannes de sectionnement cr\u00e9e des ondes de pression pouvant endommager l&#8217;infrastructure. L&#8217;enregistrement haute fr\u00e9quence permet de v\u00e9rifier que les proc\u00e9dures de man\u0153uvre de vannes sont respect\u00e9es et d&#8217;identifier les \u00e9v\u00e9nements \u00e0 risque.<\/p>\n<h2 id=\"applications\">Applications et cas d&#8217;usage<\/h2>\n<figure class=\"wp-block-table\">\n<table>\n<thead>\n<tr>\n<th>Application<\/th>\n<th>Fr\u00e9quence recommand\u00e9e<\/th>\n<th>Objectif<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u00e9tection de fuites par corr\u00e9lation<\/td>\n<td>100-1 000 Hz<\/td>\n<td>Localisation pr\u00e9cise des fuites actives<\/td>\n<\/tr>\n<tr>\n<td>Surveillance des transitoires (coups de b\u00e9lier)<\/td>\n<td>10-100 Hz<\/td>\n<td>Pr\u00e9vention des ruptures de conduites<\/td>\n<\/tr>\n<tr>\n<td>Contr\u00f4le des man\u0153uvres de vannes<\/td>\n<td>1-10 Hz<\/td>\n<td>V\u00e9rification des proc\u00e9dures op\u00e9rationnelles<\/td>\n<\/tr>\n<tr>\n<td>Surveillance des pompes<\/td>\n<td>10-100 Hz<\/td>\n<td>Maintenance pr\u00e9dictive<\/td>\n<\/tr>\n<tr>\n<td>Monitoring DMA (District Metered Area)<\/td>\n<td>0,1-1 Hz<\/td>\n<td>Bilan journalier eau non revenue<\/td>\n<\/tr>\n<tr>\n<td>Analyse de r\u00e9seau hydraulique<\/td>\n<td>1-10 Hz<\/td>\n<td>Calage de mod\u00e8les hydrauliques<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 id=\"comparaison\">Haute fr\u00e9quence vs basse fr\u00e9quence : comparaison<\/h2>\n<figure class=\"wp-block-table\">\n<table>\n<thead>\n<tr>\n<th>Crit\u00e8re<\/th>\n<th>Basse fr\u00e9quence (15 min)<\/th>\n<th>Haute fr\u00e9quence (1 Hz+)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Tendances de consommation<\/td>\n<td>\u2713 Suffisant<\/td>\n<td>\u2713 Excellent<\/td>\n<\/tr>\n<tr>\n<td>Variations de pression statique<\/td>\n<td>\u2713 Suffisant<\/td>\n<td>\u2713 Excellent<\/td>\n<\/tr>\n<tr>\n<td>Coups de b\u00e9lier<\/td>\n<td>\u2717 Invisible<\/td>\n<td>\u2713 D\u00e9tect\u00e9<\/td>\n<\/tr>\n<tr>\n<td>Transitoires de pompe<\/td>\n<td>\u2717 Invisible<\/td>\n<td>\u2713 D\u00e9tect\u00e9<\/td>\n<\/tr>\n<tr>\n<td>Fuites actives (corr\u00e9lation)<\/td>\n<td>\u2717 Non applicable<\/td>\n<td>\u2713 Localis\u00e9es<\/td>\n<\/tr>\n<tr>\n<td>Volume de donn\u00e9es<\/td>\n<td>Faible<\/td>\n<td>\u00c9lev\u00e9 (gestion n\u00e9cessaire)<\/td>\n<\/tr>\n<tr>\n<td>Autonomie batterie<\/td>\n<td>Excellente (ann\u00e9es)<\/td>\n<td>R\u00e9duite (mois \u00e0 ann\u00e9es selon fr\u00e9quence)<\/td>\n<\/tr>\n<tr>\n<td>Co\u00fbt de transmission<\/td>\n<td>Faible<\/td>\n<td>Plus \u00e9lev\u00e9 (compression recommand\u00e9e)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 id=\"implementation\">Comment mettre en \u0153uvre une surveillance haute fr\u00e9quence ?<\/h2>\n<ol>\n<li><strong>D\u00e9finir les \u00e9v\u00e9nements cibles :<\/strong> identifiez pr\u00e9cis\u00e9ment quels \u00e9v\u00e9nements vous cherchez \u00e0 d\u00e9tecter. Un r\u00e9seau avec des ant\u00e9c\u00e9dents de coups de b\u00e9lier n\u00e9cessite 10-100 Hz ; la surveillance DMA standard peut se contenter de 0,016 Hz (1 mesure par minute).<\/li>\n<li><strong>Choisir des capteurs adapt\u00e9s :<\/strong> s\u00e9lectionnez des capteurs de pression avec une pr\u00e9cision et une plage de mesure appropri\u00e9es (typiquement 0-10 bar pour les r\u00e9seaux d&#8217;eau potable urbains), avec une fr\u00e9quence d&#8217;\u00e9chantillonnage native correspondant \u00e0 vos besoins.<\/li>\n<li><strong>Planifier le stockage et la transmission des donn\u00e9es :<\/strong> une mesure par seconde g\u00e9n\u00e8re 86 400 points par jour et par capteur. Pr\u00e9voyez des m\u00e9canismes de compression, de stockage local et de transmission s\u00e9lective (transmission des \u00e9v\u00e9nements, envoi p\u00e9riodique des statistiques).<\/li>\n<li><strong>Impl\u00e9menter la d\u00e9tection d&#8217;\u00e9v\u00e9nements :<\/strong> configurez des algorithmes de d\u00e9tection en bord de capteur (edge computing) qui identifient les transitoires en temps r\u00e9el et transmettent uniquement les \u00e9v\u00e9nements pertinents, r\u00e9duisant la bande passante n\u00e9cessaire de 99%.<\/li>\n<li><strong>Analyser et agir :<\/strong> mettez en place une plateforme d&#8217;analyse capable de visualiser et d&#8217;analyser les donn\u00e9es haute fr\u00e9quence \u2014 en particulier pour identifier les patterns r\u00e9currents et corr\u00e9ler les \u00e9v\u00e9nements avec les interventions r\u00e9seau.<\/li>\n<\/ol>\n<h2 id=\"thingslog\">Solutions ThingsLog de surveillance de pression<\/h2>\n<p>ThingsLog propose des enregistreurs de donn\u00e9es IoT capables de mesurer et enregistrer la pression \u00e0 haute fr\u00e9quence, avec stockage local et transmission s\u00e9lective pour optimiser la consommation d&#8217;\u00e9nergie et les co\u00fbts de connectivit\u00e9. Nos solutions sont compatibles LoRaWAN, NB-IoT et 4G, permettant un d\u00e9ploiement dans tous les environnements de r\u00e9seau.<\/p>\n<p>Pour les projets de <a href=\"https:\/\/thingslog.com\/fr\/ressources\/coups-de-belier-surveillance-transitoires-pression-reseaux-eau\/\">surveillance des coups de b\u00e9lier<\/a> et la <a href=\"https:\/\/thingslog.com\/fr\/ressources\/reduire-eau-non-revenue-enregistreurs-iot-thingslog\/\">r\u00e9duction de l&#8217;eau non revenue<\/a>, nos solutions sont utilis\u00e9es par des services des eaux \u00e0 travers l&#8217;Europe.<\/p>\n<h2 id=\"faq\">Foire aux questions<\/h2>\n<h3>Quelle fr\u00e9quence d&#8217;\u00e9chantillonnage est n\u00e9cessaire pour d\u00e9tecter les coups de b\u00e9lier ?<\/h3>\n<p>Les coups de b\u00e9lier se d\u00e9veloppent sur des dur\u00e9es de l&#8217;ordre de la milliseconde \u00e0 la seconde. Pour les capturer avec suffisamment de r\u00e9solution pour l&#8217;analyse, une fr\u00e9quence de 10 \u00e0 100 Hz (10 \u00e0 100 mesures par seconde) est recommand\u00e9e. Pour la simple d\u00e9tection de d\u00e9passement de seuil, 1 Hz peut suffire.<\/p>\n<h3>La surveillance haute fr\u00e9quence consomme-t-elle beaucoup d&#8217;\u00e9nergie ?<\/h3>\n<p>De plus, Oui, compar\u00e9e \u00e0 l&#8217;enregistrement basse fr\u00e9quence. Cependant, des techniques d&#8217;edge computing permettent de traiter les donn\u00e9es localement et de ne transmettre que les \u00e9v\u00e9nements d\u00e9tect\u00e9s, r\u00e9duisant drastiquement la consommation de communication. Pour la surveillance permanente haute fr\u00e9quence, une alimentation secteur ou solaire est souvent pr\u00e9f\u00e9rable aux batteries seules.<\/p>\n<h3>Peut-on utiliser la surveillance haute fr\u00e9quence pour la d\u00e9tection de fuites ?<\/h3>\n<p>Par ailleurs, Oui \u2014 c&#8217;est l&#8217;une des applications les plus puissantes. La m\u00e9thode de corr\u00e9lation acoustique\/pression utilise des mesures haute fr\u00e9quence (100-1 000 Hz) sur deux points du r\u00e9seau pour localiser pr\u00e9cis\u00e9ment une fuite par analyse des diff\u00e9rences de temps d&#8217;arriv\u00e9e du signal de fuite. Cette m\u00e9thode peut localiser une fuite \u00e0 \u00b11-3 m\u00e8tres pr\u00e8s sans excavation pr\u00e9alable.<\/p>\n<h3>Quelle est la diff\u00e9rence entre surveillance haute fr\u00e9quence et enregistrement traditionnel ?<\/h3>\n<p>L&#8217;enregistrement traditionnel (toutes les 5-15 minutes) capture les tendances lentes et les variations de pression statique. La surveillance haute fr\u00e9quence (1 Hz et au-del\u00e0) capture les ph\u00e9nom\u00e8nes dynamiques fugaces. Transitoires, ondes de pression, \u00e9v\u00e9nements li\u00e9s aux man\u0153uvres de vannes et de pompes. Les deux approches sont compl\u00e9mentaires et peuvent coexister sur le m\u00eame r\u00e9seau.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La surveillance classique de la pression dans les r\u00e9seaux d&#8217;eau mesure une valeur toutes les 5, 15 ou 30 minutes. Cette fr\u00e9quence est suffisante pour d\u00e9tecter les tendances de consommation et les variations de pression statique. Mais elle rate compl\u00e8tement les \u00e9v\u00e9nements transitoires qui durent moins d&#8217;une minute : coups de b\u00e9lier, fermetures rapides de [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":487,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[14],"tags":[330,361,360],"class_list":["post-486","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ressources","tag-detection-de-fuites","tag-enregistreur-de-donnees","tag-surveillance-iot"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu\u2019est-ce que le contr\u00f4le de pression \u00e0 haute-fr\u00e9quence ? - ThingsLog<\/title>\n<meta name=\"description\" content=\"Guide complet sur la surveillance de pression \u00e0 haute fr\u00e9quence dans les r\u00e9seaux d&#039;eau : d\u00e9tection des coups de b\u00e9lier, fuites actives et transitoires. 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