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GB/T 36668.1-2018 PDF in English

GB/T 36668.1-2018 (GB/T36668.1-2018, GBT 36668.1-2018, GBT36668.1-2018)
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Standards related to: GB/T 36668.1-2018

GB/T 36668.1-2018: PDF in English (GBT 36668.1-2018)

GB/T 36668.1-2018
ICS 97.200.40
Y 57
Condition monitoring and fault diagnostics of
amusement device - Part 1. General requirements
Issued by. State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Overview of condition monitoring and fault diagnostics ... 6 
5 Implementation organization ... 10 
6 Implementers ... 11 
7 Equipment and apparatus ... 11 
8 Process specification of condition monitoring and fault diagnostics ... 12 
9 Device condition investigation and analysis ... 14 
10 Determination of health management parameters and evaluation indicators
... 14 
11 Monitoring methods ... 15 
12 Data acquisition and analysis ... 18 
13 Fault diagnostics ... 19 
14 Maintenance strategies ... 20 
15 Post-evaluation ... 21 
16 Records and reports ... 22 
17 Provisions for the use of methods which are not included in or are beyond
the specified scope of this Standard ... 22 
Appendix A (Informative) Example of condition monitoring parameters ... 23 
Appendix B (Normative) Measuring parameters or techniques which match a
fault ... 25 
Condition monitoring and fault diagnostics of
amusement device - Part 1. General requirements
1 Scope
This Part of GB/T 36668 specifies the general requirements and procedures for
condition monitoring and fault diagnostics of amusement device.
This Part applies to condition monitoring and fault diagnostics of newly-
manufactured and in-use amusement device.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 6444 Mechanical vibration - Balancing vocabulary
GB/T 9445 Non-destructive testing - Qualification and certification of NDT
GB/T 20306 Amusement devices terminology
GB/T 20737 Non-destructive testing - General terms and definitions
GB/T 20921 Condition monitoring and diagnostics of machines - Vocabulary
3 Terms and definitions
The terms and definitions defined in GB/T 6444, GB/T 20306, GB/T 20737, and
GB/T 20921, and the following are applicable to this document.
3.1 Health management of large scale amusement device
Through risk analysis, the health risk factors of large scale amusement device
are determined; the items and indicators of health management are established.
Through various inspection, testing, and monitoring methods, the health
information of the device is obtained; its health condition is diagnosed and
evaluated; and the unhealth condition found is maintained, repaired, or modified,
etc., to eliminate device fault, restore device health, and improve device design.
Note. The health management of large scale amusement device is a process of
comprehensively managing the health risk factors of large scale amusement device
with the aim of preventing and controlling accident occurrence and development,
reducing operating cost, and achieving safe, reliable operation and economic
coordination and unification of large scale amusement device.
3.2 Baseline
One or a set of descriptors which provide a benchmark for the normal condition
of each system of amusement device.
Note. The baseline is determined in the condition of steady operation of amusement device.
3.3 Baseline data
The measured or observed data or data set when the amusement device is in
an acceptable and stable operating condition.
4 Overview of condition monitoring and fault
4.1 Main content
4.1.1 Condition monitoring is to understand and master the operating condition
of amusement device through certain methods; and to use various methods of
inspection, testing, monitoring, analysis, and judgement to evaluate whether
the current operating condition of amusement device is normal; to make timely
alarms for abnormal conditions; and to provide information and data for further
fault diagnostics, performance evaluation, etc..
4.1.2 Fault diagnostics is, based on the information obtained by condition
monitoring, combined with the working principle, structural characteristics,
operating condition parameters, implementation status of amusement device,
to analyze and predict the faults which may occur in the future, and to analyze
and judge the faults which have occurred or are occurring, so as to determine
the nature, type, degree, position, and trend of the fault.
4.1.3 The purpose of implementing condition monitoring and fault diagnostics
is to provide a basis for scientific development of maintenance and repair plans
for amusement device, to timely warn potential faults and reduce the possibility
of failure, and to prevent accidents.
4.3 Use principles
4.3.1 It shall, according to the material, structure, manufacturing method, use
environment, use conditions, and damage mode of the device to be tested,
predict the types, shapes, positions, and directions of defects which may occur,
and select appropriate monitoring methods.
4.3.2 Acoustic emission method shall be selected for condition monitoring of
low-speed rotating installations/components of amusement device. There are
temperature changes caused by damage or fault in the mechanical and
electrical parts of in-use and in-manufacturing amusement device, infrared
thermography method is preferred. The vibration condition monitoring method
can be adopted for high speed rotating installations/components or structures.
The stress-strain method can be used for the condition monitoring of large
frame structures or strutting pieces.
4.3.3 When two or more monitoring methods are used to monitor the same
position of amusement device, the monitoring results shall be assessed
according to their respective methods.
4.3.4 When using the same monitoring method to monitor according to different
testing processes, if the severity of defect is diagnosed inconsistent, the
assessment result with greater risk degree shall prevail.
4.3.5 The instruments, consumables, etc. used shall comply with the
requirements of relevant condition monitoring method standards.
5 Implementation organization
5.1 The organization which conducts condition monitoring and fault diagnostics
of amusement device (hereinafter known as the implementation organization
for short) shall have professional technical personnel equipped with the
experience of working with the corresponding monitoring methods; and shall
formulate management methods for the monitoring personnel.
5.2 The implementation organization shall have special instruments and
equipment for carrying out the corresponding monitoring methods; and shall
formulate corresponding management methods for the instruments and
5.3 The implementation organization shall, in accordance with the provisions of
this Part and the corresponding monitoring method standards, develop the
process specification.
d) Intermediate checks. When necessary, the monitoring equipment and
main apparatus shall, during the verification, calibration, or check cycle,
be subjected to intermediate checks. The items, cycle, and performance
indicators of the checks shall meet the relevant regulations.
7.4 Before each implementation, the items, timing, and performance indicators
which shall be inspected shall meet the relevant requirements in each part of
GB/T 36668; and shall be specified in the process card (or operation instruction)
of implementation organization.
8 Process specification of condition monitoring and
fault diagnostics
8.1 Overview
8.1.1 The implementation organization shall develop the process specification
of condition monitoring and fault diagnostics. The process specification includes
general process specification and process card.
8.1.2 It shall establish process specification for each of the selected monitoring
8.1.3 It shall, in accordance with relevant regulations, product standards,
relevant technical documents, and this Part, in the light of the characteristics
and technical conditions of implementation organization, develop the general
process specification.
8.1.4 When system influencing factors or scope in the general process
specification changes, it shall be re-developed.
8.1.5 Process cards shall be developed in accordance with the general process
specification and monitoring requirements for monitoring objects.
8.1.6 The content of process specification shall meet the relevant requirements
of this Part and relevant condition monitoring method standards.
8.2 General process specification
8.2.1 The general process specification shall be prepared in accordance with
the relevant regulations, product standards, this Part, and the corresponding
monitoring method standards.
8.2.2 The general process specification shall include at least the following.
a) Document number;
large scale amusement device, risk analysis based on the fault analysis of
amusement device, and combined with health management needs.
10.2 Health management evaluation indicators
Health management evaluation indicators refer to a reasonable range, curve or
characteristic value change of health management parameters. The evaluation
indicators can indicate the health condition or the fault condition of amusement
Appendix A gives an example of the measured parameters which shall be
considered for some typical device types.
Appendix B contains an example of table (Table B.1), which is established for
various faults of various types of devices, corresponding to one or several
symptoms or measured parameters indicating the occurrence of a fault.
10.3 Alternative measures
If the evaluation parameters of health condition cannot be measured, the
following common alternative measures can be used. aging (initial test),
operational failure, corrective maintenance, preventive maintenance, or change
in design.
11 Monitoring methods
11.1 Measuring technique
According to the parameters to be measured in the pre-selected process, one
or more measuring techniques are used. The measured parameter may be a
single measured value, either as a whole or an average over time. For certain
parameters, such as current, voltage, and vibration, a single measured value
as a whole may make it difficult to determine health or fault conditions;
techniques such as frequency spectrum and phase measurement shall be used
to reveal the health condition or changes caused by fault. Appendix A gives
some of the range of parameters which can be measured with appropriate
measuring techniques.
Condition monitoring systems may have multiple forms. Permanently-installed,
semipermanently-installed, or portable measuring instruments can be utilized,
as well as methods for on-site or remote analysis of fluid or other material
sample pieces taken.
11.2 Accuracy of monitoring parameters
- Accessibility;
- Environment;
- Cost.
11.9 Initial early warning and alarm rules
It shall establish initial early warning and alarm rules to indicate the occurrence
of a fault. Alarms can be single-valued or multi-level (can be increased or
decreased). Step changes, which occur within pre-set early warning limit and
do not exceed the early warning limit, shall be investigated and studied. Early
warning and alarm rules can be obtained by processing several measurements
or setting them to the limits of dynamic signal.
Early warning and alarm rules shall be iteratively optimized over time.
11.10 Acquisition of baseline data
Baseline data are mainly used to compare against subsequent measured
values, to find changes in the monitored object. The determination of baseline
data shall accurately specify the initial stable working conditions of amusement
device. Baseline data shall be obtained under normal operating condition of the
device. For the device with multiple operating conditions, a baseline shall be
established for each condition.
For new and overhauled devices, changes in measured values during the first
few days or weeks of operation are usually observed. Therefore, before
baseline data are collected, run-in time shall be specified.
For device which has been running for a long time and is monitored for the first
time, its baseline can be used as a reference point for device stabilizing.
12 Data acquisition and analysis
12.1 Monitoring and trend analysis
The general procedure for data acquisition is to take measurements and
compare them to historic trends, baselines, or representative data of the same
or similar device. The procedure for data acquisition of condition monitoring is
managed by including the measurement in the routine process of project,
including the routine process in the schedule, and measuring according to the
initial specified cycle. The measurement of condition monitoring data may be
performed online according to the schedule; or may be obtained offline
according to a predetermined route or a campus tour. The generally set
expected development of existing and future faults.
The possibility of performing diagnostics depends on the machine type,
configuration, and operating conditions. By changing one or more
measurements or derived parameters from the baseline values, the fault can
be identified. Fault parameter identification can be determined by using
experience, operation results, and agreed interpretations between the
manufacturer and the customer.
If the confidence of diagnostics conclusion and (or) estimate is low, further
verification shall be required. If the confidence of diagnostics conclusion and
(or) prediction is high, maintenance or corrective measures can be initiated
13.2 Confidence improvement
In order to improve the confidence of diagnostics conclusion/prediction, one or
more of the following measures shall be taken.
a) REPEAT measurements for formal measurement and alarm condition;
b) COMPARE the measurement results with past historic trends;
c) SHORTEN the time interval between predetermined successive
d) ADD measurements at the same position and (or) at another position;
e) USE more advanced procedures or techniques;
f) ADOPT relevant backup techniques;
g) MODIFY the operating conditions or device configuration;
h) EVALUATE symptoms and rules;
i) CONSULT with other experts on specific device/failure mode.
14 Maintenance strategies
14.1 Maintenance grading
According to the evaluation results, maintenance is classified into 4 grades. no
maintenance required; regular testing, no maintenance temporarily;
maintenance measures required recently; shutdown maintenance.
If technical conditions permit, reliability-centered maintenance (RCM) can be
14.2 Determination of maintenance measures
If not critical device, immediate action may not be taken; and monitoring is
continued at normal time intervals.
It shall, according to the degree of confidence in the diagnostics
conclusion/prediction for the fault, make maintenance strategies and take
measures. If the early warning/alarm rules indicate a severe fault condition, it
shall shut down immediately, or take other measures such as reducing device
load, reducing speed or capacity.
After maintenance measures are completed, maintenance activities and
changes in the device shall be recorded, including at least the details of the
spare parts used, the process used, and other faults found during
After the maintenance measures are implemented, the components shall be
checked, to verify whether the initial diagnostics conclusion and prediction are
Repeated failures shall be avoided. If the root cause of the failure is identifiable,
the maintenance measures can be reviewed and optimized, to avoid or reduce
the influence of the failure. Optimized maintenance measures include higher-
end condition monitoring technique, additional maintenance tasks, and
manufacturer’s discussions and modifications (design).
15 Post-evaluation
Based on the operating condition and situations of the device after maintenance,
measuring techniques and maintenance measures shall be determined; and
the effectiveness of the technique used shall be evaluated.
Revisions to the early warning/alarm rules caused by changes within the device
(e.g., progressive wear, aging, modification, operation, and any periodic
changes) shall be re-evaluated.
Due to maintenance work (including component changes, adjustments, or
mission changes), measured values and baselines shall be adjusted. In special
cases, the baseline shall be re-established.
Changes in measured values may be due to changes in normal or control
operating conditions, and do not necessarily indicate a fault. The diagnostics
based on this rule shall be modified in consideration of these factors.
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.